Merge pull request #117 from google/uael/host-fixes

host: fixed `.latency` attribute error

.git-blame-ignore-revs

@@ -0,0 +1,2 @@
+# Migrate code style to Black
+135df0dcc01ab765f432e19b1a5202d29bd55545

.github/workflows/code-check.yml

@@ -0,0 +1,35 @@
+# Check the code against the formatter and linter
+name: Code format and lint check
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+
+permissions:
+  contents: read
+
+jobs:
+  check:
+    name: Check Code
+    runs-on: ubuntu-latest
+
+    steps:
+    - name: Check out from Git
+      uses: actions/checkout@v3
+    - name: Get history and tags for SCM versioning to work
+      run: |
+        git fetch --prune --unshallow
+        git fetch --depth=1 origin +refs/tags/*:refs/tags/*
+    - name: Set up Python
+      uses: actions/setup-python@v3
+      with:
+        python-version: '3.10'
+    - name: Install dependencies
+      run: |
+        python -m pip install --upgrade pip
+        python -m pip install ".[build,test,development]"
+    - name: Check
+      run: |
+        invoke project.pre-commit

.github/workflows/python-build-test.yml

@@ -14,6 +14,10 @@ jobs:
   build:
 
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        python-version: ["3.8", "3.9", "3.10"]
+      fail-fast: false
 
     steps:
     - name: Check out from Git
@@ -22,17 +26,17 @@ jobs:
       run: |
         git fetch --prune --unshallow
         git fetch --depth=1 origin +refs/tags/*:refs/tags/*
-    - name: Set up Python 3.10
-      uses: actions/setup-python@v3
+    - name: Set up Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v4
       with:
-        python-version: "3.10"
+        python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         python -m pip install ".[build,test,development,documentation]"
-    - name: Test with pytest
+    - name: Test
       run: |
-        pytest
+        invoke test
     - name: Build
       run: |
         inv build

.gitignore

@@ -3,9 +3,9 @@ build/
 dist/
 *.egg-info/
 *~
-bumble/__pycache__
 docs/mkdocs/site
-tests/__pycache__
 test-results.xml
-bumble/transport/__pycache__
-bumble/profiles/__pycache__
+__pycache__
+# generated by setuptools_scm
+bumble/_version.py
+.vscode/launch.json

.vscode/settings.json

@@ -0,0 +1,75 @@
+{
+    "cSpell.words": [
+        "Abortable",
+        "altsetting",
+        "ansiblue",
+        "ansicyan",
+        "ansigreen",
+        "ansimagenta",
+        "ansired",
+        "ansiyellow",
+        "appendleft",
+        "ASHA",
+        "asyncio",
+        "ATRAC",
+        "avdtp",
+        "bitpool",
+        "bitstruct",
+        "BSCP",
+        "BTPROTO",
+        "CCCD",
+        "cccds",
+        "cmac",
+        "CONNECTIONLESS",
+        "csrcs",
+        "datagram",
+        "DATALINK",
+        "delayreport",
+        "deregisters",
+        "deregistration",
+        "dhkey",
+        "diversifier",
+        "Fitbit",
+        "GATTLINK",
+        "HANDSFREE",
+        "keydown",
+        "keyup",
+        "levelname",
+        "libc",
+        "libusb",
+        "MITM",
+        "NDIS",
+        "NONBLOCK",
+        "NONCONN",
+        "OXIMETER",
+        "popleft",
+        "psms",
+        "pyee",
+        "pyusb",
+        "rfcomm",
+        "ROHC",
+        "rssi",
+        "SEID",
+        "seids",
+        "SERV",
+        "ssrc",
+        "strerror",
+        "subband",
+        "subbands",
+        "subevent",
+        "Subrating",
+        "substates",
+        "tobytes",
+        "tsep",
+        "usbmodem",
+        "vhci",
+        "websockets",
+        "xcursor",
+        "ycursor"
+    ],
+    "[python]": {
+        "editor.rulers": [88]
+    },
+    "python.formatting.provider": "black",
+    "pylint.importStrategy": "useBundled"
+}

README.md

@@ -29,7 +29,7 @@ For a quick start to using Bumble, see the [Getting Started](docs/mkdocs/src/get
 
 ### Dependencies
 
-To install package dependencies needed to run the bumble examples execute the following commands:
+To install package dependencies needed to run the bumble examples, execute the following commands:
 
 ```
 python -m pip install --upgrade pip
@@ -50,7 +50,7 @@ Bumble is easiest to use with a dedicated USB dongle.
 This is because internal Bluetooth interfaces tend to be locked down by the operating system.
 You can use the [usb_probe](/docs/mkdocs/src/apps_and_tools/usb_probe.md) tool (all platforms) or `lsusb` (Linux or macOS) to list the available USB devices on your system.
 
-See the [USB Transport](/docs/mkdocs/src/transports/usb.md) page for details on how to refer to USB devices.
+See the [USB Transport](/docs/mkdocs/src/transports/usb.md) page for details on how to refer to USB devices. Also, if your are on a mac, see [these instructions](docs/mkdocs/src/platforms/macos.md).
 
 ## License
 

apps/README.md

@@ -47,5 +47,3 @@ NOTE: this assumes you're running a Link Relay on port `10723`.
 
 ## `console.py`
 A simple text-based-ui interactive Bluetooth device with GATT client capabilities.
-
-

apps/console.py

@@ -29,18 +29,6 @@ from collections import OrderedDict
 import click
 import colors
 
-from bumble.core import UUID, AdvertisingData, TimeoutError, BT_LE_TRANSPORT
-from bumble.device import ConnectionParametersPreferences, Device, Connection, Peer
-from bumble.utils import AsyncRunner
-from bumble.transport import open_transport_or_link
-from bumble.gatt import Characteristic
-from bumble.hci import (
-    HCI_Constant,
-    HCI_LE_1M_PHY,
-    HCI_LE_2M_PHY,
-    HCI_LE_CODED_PHY,
-)
-
 from prompt_toolkit import Application
 from prompt_toolkit.history import FileHistory
 from prompt_toolkit.completion import Completer, Completion, NestedCompleter
@@ -60,9 +48,24 @@ from prompt_toolkit.layout import (
     FormattedTextControl,
     FloatContainer,
     ConditionalContainer,
-    Dimension
+    Dimension,
 )
 
+from bumble import __version__
+import bumble.core
+from bumble.core import UUID, AdvertisingData, BT_LE_TRANSPORT
+from bumble.device import ConnectionParametersPreferences, Device, Connection, Peer
+from bumble.utils import AsyncRunner
+from bumble.transport import open_transport_or_link
+from bumble.gatt import Characteristic, Service, CharacteristicDeclaration, Descriptor
+from bumble.hci import (
+    HCI_Constant,
+    HCI_LE_1M_PHY,
+    HCI_LE_2M_PHY,
+    HCI_LE_CODED_PHY,
+)
+
+
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
@@ -74,22 +77,15 @@ DISPLAY_MAX_RSSI           = -30
 RSSI_MONITOR_INTERVAL = 5.0  # Seconds
 
 
-# -----------------------------------------------------------------------------
-# Globals
-# -----------------------------------------------------------------------------
-App = None
-
-
 # -----------------------------------------------------------------------------
 # Utils
 # -----------------------------------------------------------------------------
 
+
 def le_phy_name(phy_id):
-    return {
-        HCI_LE_1M_PHY:    '1M',
-        HCI_LE_2M_PHY:    '2M',
-        HCI_LE_CODED_PHY: 'CODED'
-    }.get(phy_id, HCI_Constant.le_phy_name(phy_id))
+    return {HCI_LE_1M_PHY: '1M', HCI_LE_2M_PHY: '2M', HCI_LE_CODED_PHY: 'CODED'}.get(
+        phy_id, HCI_Constant.le_phy_name(phy_id)
+    )
 
 
 def rssi_bar(rssi):
@@ -104,7 +100,7 @@ def rssi_bar(rssi):
 def parse_phys(phys):
     if phys.lower() == '*':
         return None
-    else:
+
     phy_list = []
     elements = phys.lower().split(',')
     for element in elements:
@@ -132,12 +128,14 @@ class ConsoleApp:
         self.monitor_rssi = False
         self.connection_rssi = None
 
-        style = Style.from_dict({
+        style = Style.from_dict(
+            {
                 'output-field': 'bg:#000044 #ffffff',
                 'input-field': 'bg:#000000 #ffffff',
                 'line': '#004400',
-            'error':        'fg:ansired'
-        })
+                'error': 'fg:ansired',
+            }
+        )
 
         class LiveCompleter(Completer):
             def __init__(self, words):
@@ -149,26 +147,17 @@ class ConsoleApp:
                     yield Completion(word, start_position=-len(prefix))
 
         def make_completer():
-            return NestedCompleter.from_nested_dict({
-                'scan': {
-                    'on': None,
-                    'off': None,
-                    'clear': None
-                },
-                'advertise': {
-                    'on': None,
-                    'off': None
-                },
-                'rssi': {
-                    'on': None,
-                    'off': None
-                },
+            return NestedCompleter.from_nested_dict(
+                {
+                    'scan': {'on': None, 'off': None, 'clear': None},
+                    'advertise': {'on': None, 'off': None},
+                    'rssi': {'on': None, 'off': None},
                     'show': {
                         'scan': None,
-                    'services': None,
-                    'attributes': None,
                         'log': None,
-                    'device': None
+                        'device': None,
+                        'local-services': None,
+                        'remote-services': None,
                     },
                     'filter': {
                         'address': None,
@@ -177,24 +166,18 @@ class ConsoleApp:
                     'update-parameters': None,
                     'encrypt': None,
                     'disconnect': None,
-                'discover': {
-                    'services': None,
-                    'attributes': None
-                },
+                    'discover': {'services': None, 'attributes': None},
                     'request-mtu': None,
                     'read': LiveCompleter(self.known_attributes),
                     'write': LiveCompleter(self.known_attributes),
                     'subscribe': LiveCompleter(self.known_attributes),
                     'unsubscribe': LiveCompleter(self.known_attributes),
-                'set-phy': {
-                    '1m': None,
-                    '2m': None,
-                    'coded': None
-                },
+                    'set-phy': {'1m': None, '2m': None, 'coded': None},
                     'set-default-phy': None,
                     'quit': None,
-                'exit': None
-            })
+                    'exit': None,
+                }
+            )
 
         self.input_field = TextArea(
             height=1,
@@ -202,49 +185,55 @@ class ConsoleApp:
             multiline=False,
             wrap_lines=False,
             completer=make_completer(),
-            history=FileHistory(os.path.join(BUMBLE_USER_DIR, 'history'))
+            history=FileHistory(os.path.join(BUMBLE_USER_DIR, 'history')),
         )
 
         self.input_field.accept_handler = self.accept_input
 
         self.output_height = Dimension(min=7, max=7, weight=1)
         self.output_lines = []
-        self.output = FormattedTextControl(get_cursor_position=lambda: Point(0, max(0, len(self.output_lines) - 1)))
+        self.output = FormattedTextControl(
+            get_cursor_position=lambda: Point(0, max(0, len(self.output_lines) - 1))
+        )
         self.output_max_lines = 20
         self.scan_results_text = FormattedTextControl()
-        self.services_text = FormattedTextControl()
-        self.attributes_text = FormattedTextControl()
+        self.local_services_text = FormattedTextControl()
+        self.remote_services_text = FormattedTextControl()
         self.device_text = FormattedTextControl()
-        self.log_text = FormattedTextControl(get_cursor_position=lambda: Point(0, max(0, len(self.log_lines) - 1)))
+        self.log_text = FormattedTextControl(
+            get_cursor_position=lambda: Point(0, max(0, len(self.log_lines) - 1))
+        )
         self.log_height = Dimension(min=7, weight=4)
         self.log_max_lines = 100
         self.log_lines = []
 
-        container = HSplit([
+        container = HSplit(
+            [
                 ConditionalContainer(
                     Frame(Window(self.scan_results_text), title='Scan Results'),
-                filter=Condition(lambda: self.top_tab == 'scan')
+                    filter=Condition(lambda: self.top_tab == 'scan'),
                 ),
                 ConditionalContainer(
-                Frame(Window(self.services_text), title='Services'),
-                filter=Condition(lambda: self.top_tab == 'services')
+                    Frame(Window(self.local_services_text), title='Local Services'),
+                    filter=Condition(lambda: self.top_tab == 'local-services'),
                 ),
                 ConditionalContainer(
-                Frame(Window(self.attributes_text), title='Attributes'),
-                filter=Condition(lambda: self.top_tab == 'attributes')
+                    Frame(Window(self.remote_services_text), title='Remove Services'),
+                    filter=Condition(lambda: self.top_tab == 'remote-services'),
                 ),
                 ConditionalContainer(
                     Frame(Window(self.log_text, height=self.log_height), title='Log'),
-                filter=Condition(lambda: self.top_tab == 'log')
+                    filter=Condition(lambda: self.top_tab == 'log'),
                 ),
                 ConditionalContainer(
                     Frame(Window(self.device_text), title='Device'),
-                filter=Condition(lambda: self.top_tab == 'device')
+                    filter=Condition(lambda: self.top_tab == 'device'),
                 ),
                 Frame(Window(self.output, height=self.output_height)),
                 FormattedTextToolbar(text=self.get_status_bar_text, style='reverse'),
-            self.input_field
-        ])
+                self.input_field,
+            ]
+        )
 
         container = FloatContainer(
             container,
@@ -259,17 +248,16 @@ class ConsoleApp:
 
         layout = Layout(container, focused_element=self.input_field)
 
-        kb = KeyBindings()
-        @kb.add("c-c")
-        @kb.add("c-q")
+        key_bindings = KeyBindings()
+
+        @key_bindings.add("c-c")
+        @key_bindings.add("c-q")
         def _(event):
             event.app.exit()
 
+        # pylint: disable=invalid-name
         self.ui = Application(
-            layout=layout,
-            style=style,
-            key_bindings=kb,
-            full_screen=True
+            layout=layout, style=style, key_bindings=key_bindings, full_screen=True
         )
 
     async def run_async(self, device_config, transport):
@@ -277,16 +265,23 @@ class ConsoleApp:
 
         async with await open_transport_or_link(transport) as (hci_source, hci_sink):
             if device_config:
-                self.device = Device.from_config_file_with_hci(device_config, hci_source, hci_sink)
+                self.device = Device.from_config_file_with_hci(
+                    device_config, hci_source, hci_sink
+                )
             else:
-                random_address = f"{random.randint(192,255):02X}"  # address is static random
-                for c in random.sample(range(255), 5):
-                    random_address += f":{c:02X}"
+                random_address = (
+                    f"{random.randint(192,255):02X}"  # address is static random
+                )
+                for random_byte in random.sample(range(255), 5):
+                    random_address += f":{random_byte:02X}"
                 self.append_to_log(f"Setting random address: {random_address}")
-                self.device = Device.with_hci('Bumble', random_address, hci_source, hci_sink)
+                self.device = Device.with_hci(
+                    'Bumble', random_address, hci_source, hci_sink
+                )
             self.device.listener = DeviceListener(self)
             await self.device.power_on()
             self.show_device(self.device)
+            self.show_local_services(self.device.gatt_server.attributes)
 
             # Run the UI
             await self.ui.run_async()
@@ -296,7 +291,7 @@ class ConsoleApp:
     def add_known_address(self, address):
         self.known_addresses.add(address)
 
-    def accept_input(self, buff):
+    def accept_input(self, _):
         if len(self.input_field.text) == 0:
             return
         self.append_to_output([('', '* '), ('ansicyan', self.input_field.text)], False)
@@ -315,13 +310,27 @@ class ConsoleApp:
                 connection_state = 'CONNECTING'
             elif self.connected_peer:
                 connection = self.connected_peer.connection
-                connection_parameters = f'{connection.parameters.connection_interval}/{connection.parameters.peripheral_latency}/{connection.parameters.supervision_timeout}'
+                connection_parameters = (
+                    f'{connection.parameters.connection_interval}/'
+                    f'{connection.parameters.peripheral_latency}/'
+                    f'{connection.parameters.supervision_timeout}'
+                )
                 if connection.transport == BT_LE_TRANSPORT:
-                    phy_state = f' RX={le_phy_name(connection.phy.rx_phy)}/TX={le_phy_name(connection.phy.tx_phy)}'
+                    phy_state = (
+                        f' RX={le_phy_name(connection.phy.rx_phy)}/'
+                        f'TX={le_phy_name(connection.phy.tx_phy)}'
+                    )
                 else:
                     phy_state = ''
-                connection_state = f'{connection.peer_address} {connection_parameters} {connection.data_length}{phy_state}'
-                encryption_state = 'ENCRYPTED' if connection.is_encrypted else 'NOT ENCRYPTED'
+                connection_state = (
+                    f'{connection.peer_address} '
+                    f'{connection_parameters} '
+                    f'{connection.data_length}'
+                    f'{phy_state}'
+                )
+                encryption_state = (
+                    'ENCRYPTED' if connection.is_encrypted else 'NOT ENCRYPTED'
+                )
                 att_mtu = f'ATT_MTU: {connection.att_mtu}'
 
         return [
@@ -333,7 +342,7 @@ class ConsoleApp:
             ('', '  '),
             ('ansicyan', f' {att_mtu} '),
             ('', '  '),
-            ('ansiyellow', f' {rssi} ')
+            ('ansiyellow', f' {rssi} '),
         ]
 
     def show_error(self, title, details=None):
@@ -351,35 +360,45 @@ class ConsoleApp:
         self.scan_results_text.text = ANSI('\n'.join(lines))
         self.ui.invalidate()
 
-    def show_services(self, services):
+    def show_remote_services(self, services):
         lines = []
         del self.known_attributes[:]
         for service in services:
-            lines.append(('ansicyan', str(service) + '\n'))
+            lines.append(("ansicyan", f"{service}\n"))
 
             for characteristic in service.characteristics:
-                lines.append(('ansimagenta', '  ' + str(characteristic) + '\n'))
-                self.known_attributes.append(f'{service.uuid.to_hex_str()}.{characteristic.uuid.to_hex_str()}')
+                lines.append(('ansimagenta', f'  {characteristic} + \n'))
+                self.known_attributes.append(
+                    f'{service.uuid.to_hex_str()}.{characteristic.uuid.to_hex_str()}'
+                )
                 self.known_attributes.append(f'*.{characteristic.uuid.to_hex_str()}')
                 self.known_attributes.append(f'#{characteristic.handle:X}')
                 for descriptor in characteristic.descriptors:
-                    lines.append(('ansigreen', '    ' + str(descriptor) + '\n'))
+                    lines.append(("ansigreen", f"    {descriptor}\n"))
 
-        self.services_text.text = lines
+        self.remote_services_text.text = lines
         self.ui.invalidate()
 
-    def show_attributes(self, attributes):
+    def show_local_services(self, attributes):
         lines = []
-
         for attribute in attributes:
-            lines.append(('ansicyan', f'{attribute}\n'))
+            if isinstance(attribute, Service):
+                lines.append(("ansicyan", f"{attribute}\n"))
+            elif isinstance(attribute, (Characteristic, CharacteristicDeclaration)):
+                lines.append(("ansimagenta", f"  {attribute}\n"))
+            elif isinstance(attribute, Descriptor):
+                lines.append(("ansigreen", f"    {attribute}\n"))
+            else:
+                lines.append(("ansiyellow", f"{attribute}\n"))
 
-        self.attributes_text.text = lines
+        self.local_services_text.text = lines
         self.ui.invalidate()
 
     def show_device(self, device):
         lines = []
 
+        lines.append(('ansicyan', 'Bumble Version:       '))
+        lines.append(('', f'{__version__}\n'))
         lines.append(('ansicyan', 'Name:                 '))
         lines.append(('', f'{device.name}\n'))
         lines.append(('ansicyan', 'Public Address:       '))
@@ -407,7 +426,10 @@ class ConsoleApp:
         advertising_interval = (
             device.advertising_interval_min
             if device.advertising_interval_min == device.advertising_interval_max
-            else f"{device.advertising_interval_min} to {device.advertising_interval_max}"
+            else (
+                f'{device.advertising_interval_min} to '
+                f'{device.advertising_interval_max}'
+            )
         )
         lines.append(('ansicyan', 'Advertising Interval: '))
         lines.append(('', f'{advertising_interval}\n'))
@@ -416,7 +438,7 @@ class ConsoleApp:
         self.ui.invalidate()
 
     def append_to_output(self, line, invalidate=True):
-        if type(line) is str:
+        if isinstance(line, str):
             line = [('', line)]
         self.output_lines = self.output_lines[-self.output_max_lines :]
         self.output_lines.append(line)
@@ -454,7 +476,7 @@ class ConsoleApp:
                 await self.connected_peer.discover_descriptors(characteristic)
         self.append_to_output('discovery completed')
 
-        self.show_services(self.connected_peer.services)
+        self.show_remote_services(self.connected_peer.services)
 
     async def discover_attributes(self):
         if not self.connected_peer:
@@ -486,6 +508,8 @@ class ConsoleApp:
                         if characteristic.handle == attribute_handle:
                             return characteristic
 
+        return None
+
     async def rssi_monitor_loop(self):
         while True:
             if self.monitor_rssi and self.connected_peer:
@@ -515,7 +539,11 @@ class ConsoleApp:
         elif params[0] == 'on':
             if len(params) == 2:
                 if not params[1].startswith("filter="):
-                    self.show_error('invalid syntax', 'expected address filter=key1:value1,key2:value,... available filters: address')
+                    self.show_error(
+                        'invalid syntax',
+                        'expected address filter=key1:value1,key2:value,... '
+                        'available filters: address',
+                    )
                 # regex: (word):(any char except ,)
                 matches = re.findall(r"(\w+):([^,]+)", params[1])
                 for match in matches:
@@ -557,8 +585,7 @@ class ConsoleApp:
             connection_parameters_preferences = None
         else:
             connection_parameters_preferences = {
-                phy: ConnectionParametersPreferences()
-                for phy in phys
+                phy: ConnectionParametersPreferences() for phy in phys
             }
 
         if self.device.is_scanning:
@@ -570,13 +597,13 @@ class ConsoleApp:
             await self.device.connect(
                 params[0],
                 connection_parameters_preferences=connection_parameters_preferences,
-                timeout=DEFAULT_CONNECTION_TIMEOUT
+                timeout=DEFAULT_CONNECTION_TIMEOUT,
             )
             self.top_tab = 'services'
-        except TimeoutError:
+        except bumble.core.TimeoutError:
             self.show_error('connection timed out')
 
-    async def do_disconnect(self, params):
+    async def do_disconnect(self, _):
         if self.device.is_le_connecting:
             await self.device.cancel_connection()
         else:
@@ -588,7 +615,11 @@ class ConsoleApp:
 
     async def do_update_parameters(self, params):
         if len(params) != 1 or len(params[0].split('/')) != 3:
-            self.show_error('invalid syntax', 'expected update-parameters <interval-min>-<interval-max>/<max-latency>/<supervision>')
+            self.show_error(
+                'invalid syntax',
+                'expected update-parameters <interval-min>-<interval-max>'
+                '/<max-latency>/<supervision>',
+            )
             return
 
         if not self.connected_peer:
@@ -596,17 +627,19 @@ class ConsoleApp:
             return
 
         connection_intervals, max_latency, supervision_timeout = params[0].split('/')
-        connection_interval_min, connection_interval_max = [int(x) for x in connection_intervals.split('-')]
+        connection_interval_min, connection_interval_max = [
+            int(x) for x in connection_intervals.split('-')
+        ]
         max_latency = int(max_latency)
         supervision_timeout = int(supervision_timeout)
         await self.connected_peer.connection.update_parameters(
             connection_interval_min,
             connection_interval_max,
             max_latency,
-            supervision_timeout
+            supervision_timeout,
         )
 
-    async def do_encrypt(self, params):
+    async def do_encrypt(self, _):
         if not self.connected_peer:
             self.show_error('not connected')
             return
@@ -629,17 +662,26 @@ class ConsoleApp:
 
     async def do_show(self, params):
         if params:
-            if params[0] in {'scan', 'services', 'attributes', 'log', 'device'}:
+            if params[0] in {
+                'scan',
+                'log',
+                'device',
+                'local-services',
+                'remote-services',
+            }:
                 self.top_tab = params[0]
                 self.ui.invalidate()
 
-    async def do_get_phy(self, params):
+    async def do_get_phy(self, _):
         if not self.connected_peer:
             self.show_error('not connected')
             return
 
         phy = await self.connected_peer.connection.get_phy()
-        self.append_to_output(f'PHY: RX={HCI_Constant.le_phy_name(phy[0])}, TX={HCI_Constant.le_phy_name(phy[1])}')
+        self.append_to_output(
+            f'PHY: RX={HCI_Constant.le_phy_name(phy[0])}, '
+            f'TX={HCI_Constant.le_phy_name(phy[1])}'
+        )
 
     async def do_request_mtu(self, params):
         if len(params) != 1:
@@ -721,7 +763,9 @@ class ConsoleApp:
             return
 
         await characteristic.subscribe(
-            lambda value: self.append_to_output(f"{characteristic} VALUE: 0x{value.hex()}"),
+            lambda value: self.append_to_output(
+                f"{characteristic} VALUE: 0x{value.hex()}"
+            ),
         )
 
     async def do_unsubscribe(self, params):
@@ -742,7 +786,9 @@ class ConsoleApp:
 
     async def do_set_phy(self, params):
         if len(params) != 1:
-            self.show_error('invalid syntax', 'expected set-phy <tx_rx_phys>|<tx_phys>/<rx_phys>')
+            self.show_error(
+                'invalid syntax', 'expected set-phy <tx_rx_phys>|<tx_phys>/<rx_phys>'
+            )
             return
 
         if not self.connected_peer:
@@ -756,13 +802,15 @@ class ConsoleApp:
             rx_phys = tx_phys
 
         await self.connected_peer.connection.set_phy(
-            tx_phys=parse_phys(tx_phys),
-            rx_phys=parse_phys(rx_phys)
+            tx_phys=parse_phys(tx_phys), rx_phys=parse_phys(rx_phys)
         )
 
     async def do_set_default_phy(self, params):
         if len(params) != 1:
-            self.show_error('invalid syntax', 'expected set-default-phy <tx_rx_phys>|<tx_phys>/<rx_phys>')
+            self.show_error(
+                'invalid syntax',
+                'expected set-default-phy <tx_rx_phys>|<tx_phys>/<rx_phys>',
+            )
             return
 
         if '/' in params[0]:
@@ -772,14 +820,13 @@ class ConsoleApp:
             rx_phys = tx_phys
 
         await self.device.set_default_phy(
-            tx_phys=parse_phys(tx_phys),
-            rx_phys=parse_phys(rx_phys)
+            tx_phys=parse_phys(tx_phys), rx_phys=parse_phys(rx_phys)
         )
 
-    async def do_exit(self, params):
+    async def do_exit(self, _):
         self.ui.exit()
 
-    async def do_quit(self, params):
+    async def do_quit(self, _):
         self.ui.exit()
 
     async def do_filter(self, params):
@@ -789,6 +836,7 @@ class ConsoleApp:
                 return
             self.device.listener.address_filter = params[1]
 
+
 # -----------------------------------------------------------------------------
 # Device and Connection Listener
 # -----------------------------------------------------------------------------
@@ -808,7 +856,9 @@ class DeviceListener(Device.Listener, Connection.Listener):
             self._address_filter = re.compile(r".*")
         else:
             self._address_filter = re.compile(filter_addr)
-        self.scan_results = OrderedDict(filter(lambda x: self.filter_address_match(x), self.scan_results))
+        self.scan_results = OrderedDict(
+            filter(self.filter_address_match, self.scan_results)
+        )
         self.app.show_scan_results(self.scan_results)
 
     def filter_address_match(self, address):
@@ -818,6 +868,7 @@ class DeviceListener(Device.Listener, Connection.Listener):
         return bool(self.address_filter.match(address))
 
     @AsyncRunner.run_in_task()
+    # pylint: disable=invalid-overridden-method
     async def on_connection(self, connection):
         self.app.connected_peer = Peer(connection)
         self.app.connection_rssi = None
@@ -825,24 +876,44 @@ class DeviceListener(Device.Listener, Connection.Listener):
         connection.listener = self
 
     def on_disconnection(self, reason):
-        self.app.append_to_output(f'disconnected from {self.app.connected_peer}, reason: {HCI_Constant.error_name(reason)}')
+        self.app.append_to_output(
+            f'disconnected from {self.app.connected_peer}, '
+            f'reason: {HCI_Constant.error_name(reason)}'
+        )
         self.app.connected_peer = None
         self.app.connection_rssi = None
 
     def on_connection_parameters_update(self):
-        self.app.append_to_output(f'connection parameters update: {self.app.connected_peer.connection.parameters}')
+        self.app.append_to_output(
+            f'connection parameters update: '
+            f'{self.app.connected_peer.connection.parameters}'
+        )
 
     def on_connection_phy_update(self):
-        self.app.append_to_output(f'connection phy update: {self.app.connected_peer.connection.phy}')
+        self.app.append_to_output(
+            f'connection phy update: {self.app.connected_peer.connection.phy}'
+        )
 
     def on_connection_att_mtu_update(self):
-        self.app.append_to_output(f'connection att mtu update: {self.app.connected_peer.connection.att_mtu}')
+        self.app.append_to_output(
+            f'connection att mtu update: {self.app.connected_peer.connection.att_mtu}'
+        )
 
     def on_connection_encryption_change(self):
-        self.app.append_to_output(f'connection encryption change: {"encrypted" if self.app.connected_peer.connection.is_encrypted else "not encrypted"}')
+        encryption_state = (
+            'encrypted'
+            if self.app.connected_peer.connection.is_encrypted
+            else 'not encrypted'
+        )
+        self.app.append_to_output(
+            'connection encryption change: ' f'{encryption_state}'
+        )
 
     def on_connection_data_length_change(self):
-        self.app.append_to_output(f'connection data length change: {self.app.connected_peer.connection.data_length}')
+        self.app.append_to_output(
+            'connection data length change: '
+            f'{self.app.connected_peer.connection.data_length}'
+        )
 
     def on_advertisement(self, advertisement):
         if not self.filter_address_match(str(advertisement.address)):
@@ -856,7 +927,13 @@ class DeviceListener(Device.Listener, Connection.Listener):
             entry.connectable = advertisement.is_connectable
         else:
             self.app.add_known_address(str(advertisement.address))
-            self.scan_results[entry_key] = ScanResult(advertisement.address, advertisement.address.address_type, advertisement.data, advertisement.rssi, advertisement.is_connectable)
+            self.scan_results[entry_key] = ScanResult(
+                advertisement.address,
+                advertisement.address.address_type,
+                advertisement.data,
+                advertisement.rssi,
+                advertisement.is_connectable,
+            )
 
         self.app.show_scan_results(self.scan_results)
 
@@ -892,10 +969,16 @@ class ScanResult:
         else:
             name = ''
 
+        # Remove any '/P' qualifier suffix from the address string
+        address_str = str(self.address).replace('/P', '')
+
         # RSSI bar
         bar_string = rssi_bar(self.rssi)
         bar_padding = ' ' * (DEFAULT_RSSI_BAR_WIDTH + 5 - len(bar_string))
-        return f'{address_color(str(self.address))} [{type_color(address_type_string)}] {bar_string} {bar_padding} {name}'
+        return (
+            f'{address_color(address_str)} [{type_color(address_type_string)}] '
+            f'{bar_string} {bar_padding} {name}'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -923,7 +1006,7 @@ def main(device_config, transport):
     if not os.path.isdir(BUMBLE_USER_DIR):
         os.mkdir(BUMBLE_USER_DIR)
 
-    # Create an instane of the app
+    # Create an instance of the app
     app = ConsoleApp()
 
     # Setup logging
@@ -940,4 +1023,4 @@ def main(device_config, transport):
 
 # -----------------------------------------------------------------------------
 if __name__ == "__main__":
-    main()
+    main()  # pylint: disable=no-value-for-parameter

apps/controller_info.py

@@ -39,7 +39,7 @@ from bumble.hci import (
     HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS_COMMAND,
     HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command,
     HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH_COMMAND,
-    HCI_LE_Read_Maximum_Advertising_Data_Length_Command
+    HCI_LE_Read_Maximum_Advertising_Data_Length_Command,
 )
 from bumble.host import Host
 from bumble.transport import open_transport_or_link
@@ -51,13 +51,18 @@ async def get_classic_info(host):
         response = await host.send_command(HCI_Read_BD_ADDR_Command())
         if response.return_parameters.status == HCI_SUCCESS:
             print()
-            print(color('Classic Address:', 'yellow'), response.return_parameters.bd_addr)
+            print(
+                color('Classic Address:', 'yellow'), response.return_parameters.bd_addr
+            )
 
     if host.supports_command(HCI_READ_LOCAL_NAME_COMMAND):
         response = await host.send_command(HCI_Read_Local_Name_Command())
         if response.return_parameters.status == HCI_SUCCESS:
             print()
-            print(color('Local Name:', 'yellow'), map_null_terminated_utf8_string(response.return_parameters.local_name))
+            print(
+                color('Local Name:', 'yellow'),
+                map_null_terminated_utf8_string(response.return_parameters.local_name),
+            )
 
 
 # -----------------------------------------------------------------------------
@@ -65,21 +70,25 @@ async def get_le_info(host):
     print()
 
     if host.supports_command(HCI_LE_READ_NUMBER_OF_SUPPORTED_ADVERTISING_SETS_COMMAND):
-        response = await host.send_command(HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command())
+        response = await host.send_command(
+            HCI_LE_Read_Number_Of_Supported_Advertising_Sets_Command()
+        )
         if response.return_parameters.status == HCI_SUCCESS:
             print(
                 color('LE Number Of Supported Advertising Sets:', 'yellow'),
                 response.return_parameters.num_supported_advertising_sets,
-                '\n'
+                '\n',
             )
 
     if host.supports_command(HCI_LE_READ_MAXIMUM_ADVERTISING_DATA_LENGTH_COMMAND):
-        response = await host.send_command(HCI_LE_Read_Maximum_Advertising_Data_Length_Command())
+        response = await host.send_command(
+            HCI_LE_Read_Maximum_Advertising_Data_Length_Command()
+        )
         if response.return_parameters.status == HCI_SUCCESS:
             print(
                 color('LE Maximum Advertising Data Length:', 'yellow'),
                 response.return_parameters.max_advertising_data_length,
-                '\n'
+                '\n',
             )
 
     if host.supports_command(HCI_LE_READ_MAXIMUM_DATA_LENGTH_COMMAND):
@@ -93,7 +102,7 @@ async def get_le_info(host):
                     f'rx:{response.return_parameters.supported_max_rx_octets}/'
                     f'{response.return_parameters.supported_max_rx_time}'
                 ),
-                '\n'
+                '\n',
             )
 
     print(color('LE Features:', 'yellow'))
@@ -112,10 +121,19 @@ async def async_main(transport):
 
         # Print version
         print(color('Version:', 'yellow'))
-        print(color('  Manufacturer:  ', 'green'), name_or_number(COMPANY_IDENTIFIERS, host.local_version.company_identifier))
-        print(color('  HCI Version:   ', 'green'), name_or_number(HCI_VERSION_NAMES, host.local_version.hci_version))
+        print(
+            color('  Manufacturer:  ', 'green'),
+            name_or_number(COMPANY_IDENTIFIERS, host.local_version.company_identifier),
+        )
+        print(
+            color('  HCI Version:   ', 'green'),
+            name_or_number(HCI_VERSION_NAMES, host.local_version.hci_version),
+        )
         print(color('  HCI Subversion:', 'green'), host.local_version.hci_subversion)
-        print(color('  LMP Version:   ', 'green'), name_or_number(LMP_VERSION_NAMES, host.local_version.lmp_version))
+        print(
+            color('  LMP Version:   ', 'green'),
+            name_or_number(LMP_VERSION_NAMES, host.local_version.lmp_version),
+        )
         print(color('  LMP Subversion:', 'green'), host.local_version.lmp_subversion)
 
         # Get the Classic info

apps/controllers.py

@@ -28,11 +28,14 @@ from bumble.transport import open_transport_or_link
 # -----------------------------------------------------------------------------
 async def async_main():
     if len(sys.argv) != 3:
-        print('Usage: controllers.py <hci-transport-1> <hci-transport-2> [<hci-transport-3> ...]')
+        print(
+            'Usage: controllers.py <hci-transport-1> <hci-transport-2> '
+            '[<hci-transport-3> ...]'
+        )
         print('example: python controllers.py pty:ble1 pty:ble2')
         return
 
-    # Create a loccal link to attach the controllers to
+    # Create a local link to attach the controllers to
     link = LocalLink()
 
     # Create a transport and controller for all requested names
@@ -41,7 +44,12 @@ async def async_main():
     for index, transport_name in enumerate(sys.argv[1:]):
         transport = await open_transport_or_link(transport_name)
         transports.append(transport)
-        controller = Controller(f'C{index}', host_source = transport.source, host_sink = transport.sink, link = link)
+        controller = Controller(
+            f'C{index}',
+            host_source=transport.source,
+            host_sink=transport.sink,
+            link=link,
+        )
         controllers.append(controller)
 
     # Wait until the user interrupts

apps/gatt_dump.py

@@ -21,7 +21,7 @@ import logging
 import click
 from colors import color
 
-from bumble.core import ProtocolError, TimeoutError
+import bumble.core
 from bumble.device import Device, Peer
 from bumble.gatt import show_services
 from bumble.transport import open_transport_or_link
@@ -49,9 +49,9 @@ async def dump_gatt_db(peer, done):
         try:
             value = await attribute.read_value()
             print(color(f'{value.hex()}', 'green'))
-        except ProtocolError as error:
+        except bumble.core.ProtocolError as error:
             print(color(error, 'red'))
-        except TimeoutError:
+        except bumble.core.TimeoutError:
             print(color('read timeout', 'red'))
 
     if done is not None:
@@ -64,9 +64,13 @@ async def async_main(device_config, encrypt, transport, address_or_name):
 
         # Create a device
         if device_config:
-            device = Device.from_config_file_with_hci(device_config, hci_source, hci_sink)
+            device = Device.from_config_file_with_hci(
+                device_config, hci_source, hci_sink
+            )
         else:
-            device = Device.with_hci('Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink)
+            device = Device.with_hci(
+                'Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink
+            )
         await device.power_on()
 
         if address_or_name:
@@ -81,7 +85,12 @@ async def async_main(device_config, encrypt, transport, address_or_name):
         else:
             # Wait for a connection
             done = asyncio.get_running_loop().create_future()
-            device.on('connection', lambda connection: asyncio.create_task(dump_gatt_db(Peer(connection), done)))
+            device.on(
+                'connection',
+                lambda connection: asyncio.create_task(
+                    dump_gatt_db(Peer(connection), done)
+                ),
+            )
             await device.start_advertising(auto_restart=True)
 
             print(color('### Waiting for connection...', 'blue'))

apps/gg_bridge.py

@@ -36,7 +36,9 @@ from bumble.hci import HCI_Constant
 GG_GATTLINK_SERVICE_UUID = 'ABBAFF00-E56A-484C-B832-8B17CF6CBFE8'
 GG_GATTLINK_RX_CHARACTERISTIC_UUID = 'ABBAFF01-E56A-484C-B832-8B17CF6CBFE8'
 GG_GATTLINK_TX_CHARACTERISTIC_UUID = 'ABBAFF02-E56A-484C-B832-8B17CF6CBFE8'
-GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID = 'ABBAFF03-E56A-484C-B832-8B17CF6CBFE8'
+GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID = (
+    'ABBAFF03-E56A-484C-B832-8B17CF6CBFE8'
+)
 
 GG_PREFERRED_MTU = 256
 
@@ -97,6 +99,7 @@ class GattlinkHubBridge(GattlinkL2capEndpoint, Device.Listener):
             print(color(f'!!! Connection failed: {error}', 'red'))
 
     @AsyncRunner.run_in_task()
+    # pylint: disable=invalid-overridden-method
     async def on_connection(self, connection):
         print(f'=== Connected to {connection}')
         self.peer = Peer(connection)
@@ -127,7 +130,9 @@ class GattlinkHubBridge(GattlinkL2capEndpoint, Device.Listener):
                 self.rx_characteristic = characteristic
             elif characteristic.uuid == GG_GATTLINK_TX_CHARACTERISTIC_UUID:
                 self.tx_characteristic = characteristic
-            elif characteristic.uuid == GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID:
+            elif (
+                characteristic.uuid == GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID
+            ):
                 self.l2cap_psm_characteristic = characteristic
         print('RX:', self.rx_characteristic)
         print('TX:', self.tx_characteristic)
@@ -135,7 +140,9 @@ class GattlinkHubBridge(GattlinkL2capEndpoint, Device.Listener):
 
         if self.l2cap_psm_characteristic:
             # Subscribe to and then read the PSM value
-            await self.peer.subscribe(self.l2cap_psm_characteristic, self.on_l2cap_psm_received)
+            await self.peer.subscribe(
+                self.l2cap_psm_characteristic, self.on_l2cap_psm_received
+            )
             psm_bytes = await self.peer.read_value(self.l2cap_psm_characteristic)
             psm = struct.unpack('<H', psm_bytes)[0]
             await self.connect_l2cap(psm)
@@ -150,7 +157,13 @@ class GattlinkHubBridge(GattlinkL2capEndpoint, Device.Listener):
         print(color(f'!!! Connection failed: {error}'))
 
     def on_disconnection(self, reason):
-        print(color(f'!!! Disconnected from {self.peer}, reason={HCI_Constant.error_name(reason)}', 'red'))
+        print(
+            color(
+                f'!!! Disconnected from {self.peer}, '
+                f'reason={HCI_Constant.error_name(reason)}',
+                'red',
+            )
+        )
         self.tx_characteristic = None
         self.rx_characteristic = None
         self.peer = None
@@ -178,7 +191,7 @@ class GattlinkHubBridge(GattlinkL2capEndpoint, Device.Listener):
         pass
 
     # Called by asyncio when a UDP datagram is received
-    def datagram_received(self, data, address):
+    def datagram_received(self, data, _address):
         print(color(f'<<< [UDP]: {len(data)} bytes', 'green'))
 
         if self.l2cap_channel:
@@ -198,6 +211,7 @@ class GattlinkNodeBridge(GattlinkL2capEndpoint, Device.Listener):
         self.tx_socket = None
         self.tx_subscriber = None
         self.rx_characteristic = None
+        self.transport = None
 
         # Register as a listener
         device.listener = self
@@ -212,35 +226,37 @@ class GattlinkNodeBridge(GattlinkL2capEndpoint, Device.Listener):
             GG_GATTLINK_RX_CHARACTERISTIC_UUID,
             Characteristic.WRITE_WITHOUT_RESPONSE,
             Characteristic.WRITEABLE,
-            CharacteristicValue(write=self.on_rx_write)
+            CharacteristicValue(write=self.on_rx_write),
         )
         self.tx_characteristic = Characteristic(
             GG_GATTLINK_TX_CHARACTERISTIC_UUID,
             Characteristic.NOTIFY,
-            Characteristic.READABLE
+            Characteristic.READABLE,
         )
         self.tx_characteristic.on('subscription', self.on_tx_subscription)
         self.psm_characteristic = Characteristic(
             GG_GATTLINK_L2CAP_CHANNEL_PSM_CHARACTERISTIC_UUID,
             Characteristic.READ | Characteristic.NOTIFY,
             Characteristic.READABLE,
-            bytes([psm, 0])
+            bytes([psm, 0]),
         )
         gattlink_service = Service(
             GG_GATTLINK_SERVICE_UUID,
-            [
-                self.rx_characteristic,
-                self.tx_characteristic,
-                self.psm_characteristic
-            ]
+            [self.rx_characteristic, self.tx_characteristic, self.psm_characteristic],
         )
         device.add_services([gattlink_service])
         device.advertising_data = bytes(
-            AdvertisingData([
+            AdvertisingData(
+                [
                     (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble GG', 'utf-8')),
-                (AdvertisingData.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
-                 bytes(reversed(bytes.fromhex('ABBAFF00E56A484CB8328B17CF6CBFE8'))))
-            ])
+                    (
+                        AdvertisingData.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+                        bytes(
+                            reversed(bytes.fromhex('ABBAFF00E56A484CB8328B17CF6CBFE8'))
+                        ),
+                    ),
+                ]
+            )
         )
 
     async def start(self):
@@ -251,7 +267,7 @@ class GattlinkNodeBridge(GattlinkL2capEndpoint, Device.Listener):
         self.transport = transport
 
     # Called by asyncio when a UDP datagram is received
-    def datagram_received(self, data, address):
+    def datagram_received(self, data, _address):
         print(color(f'<<< [UDP]: {len(data)} bytes', 'green'))
 
         if self.l2cap_channel:
@@ -263,14 +279,17 @@ class GattlinkNodeBridge(GattlinkL2capEndpoint, Device.Listener):
             asyncio.create_task(self.device.notify_subscribers(self.tx_characteristic))
 
     # Called when a write to the RX characteristic has been received
-    def on_rx_write(self, connection, data):
+    def on_rx_write(self, _connection, data):
         print(color(f'<<< [GATT RX]: {len(data)} bytes', 'cyan'))
         print(color('>>> [UDP]', 'magenta'))
         self.tx_socket.sendto(data)
 
     # Called when the subscription to the TX characteristic has changed
     def on_tx_subscription(self, peer, enabled):
-        print(f'### [GATT TX] subscription from {peer}: {"enabled" if enabled else "disabled"}')
+        print(
+            f'### [GATT TX] subscription from {peer}: '
+            f'{"enabled" if enabled else "disabled"}'
+        )
         if enabled:
             self.tx_subscriber = peer
         else:
@@ -290,7 +309,15 @@ class GattlinkNodeBridge(GattlinkL2capEndpoint, Device.Listener):
 
 
 # -----------------------------------------------------------------------------
-async def run(hci_transport, device_address, role_or_peer_address, send_host, send_port, receive_host, receive_port):
+async def run(
+    hci_transport,
+    device_address,
+    role_or_peer_address,
+    send_host,
+    send_port,
+    receive_host,
+    receive_port,
+):
     print('<<< connecting to HCI...')
     async with await open_transport_or_link(hci_transport) as (hci_source, hci_sink):
         print('<<< connected')
@@ -307,14 +334,14 @@ async def run(hci_transport, device_address, role_or_peer_address, send_host, se
         # Create a UDP to RX bridge (receive from UDP, send to RX)
         loop = asyncio.get_running_loop()
         await loop.create_datagram_endpoint(
-            lambda: bridge,
-            local_addr=(receive_host, receive_port)
+            lambda: bridge, local_addr=(receive_host, receive_port)
         )
 
         # Create a UDP to TX bridge (receive from TX, send to UDP)
         bridge.tx_socket, _ = await loop.create_datagram_endpoint(
+            # pylint: disable-next=unnecessary-lambda
             lambda: asyncio.DatagramProtocol(),
-            remote_addr=(send_host, send_port)
+            remote_addr=(send_host, send_port),
         )
 
         await device.power_on()
@@ -328,12 +355,40 @@ async def run(hci_transport, device_address, role_or_peer_address, send_host, se
 @click.argument('hci_transport')
 @click.argument('device_address')
 @click.argument('role_or_peer_address')
-@click.option('-sh', '--send-host', type=str, default='127.0.0.1', help='UDP host to send to')
+@click.option(
+    '-sh', '--send-host', type=str, default='127.0.0.1', help='UDP host to send to'
+)
 @click.option('-sp', '--send-port', type=int, default=9001, help='UDP port to send to')
-@click.option('-rh', '--receive-host', type=str, default='127.0.0.1', help='UDP host to receive on')
-@click.option('-rp', '--receive-port', type=int, default=9000, help='UDP port to receive on')
-def main(hci_transport, device_address, role_or_peer_address, send_host, send_port, receive_host, receive_port):
-    asyncio.run(run(hci_transport, device_address, role_or_peer_address, send_host, send_port, receive_host, receive_port))
+@click.option(
+    '-rh',
+    '--receive-host',
+    type=str,
+    default='127.0.0.1',
+    help='UDP host to receive on',
+)
+@click.option(
+    '-rp', '--receive-port', type=int, default=9000, help='UDP port to receive on'
+)
+def main(
+    hci_transport,
+    device_address,
+    role_or_peer_address,
+    send_host,
+    send_port,
+    receive_host,
+    receive_port,
+):
+    asyncio.run(
+        run(
+            hci_transport,
+            device_address,
+            role_or_peer_address,
+            send_host,
+            send_port,
+            receive_host,
+            receive_port,
+        )
+    )
 
 
 # -----------------------------------------------------------------------------

apps/hci_bridge.py

@@ -34,16 +34,29 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 async def async_main():
     if len(sys.argv) < 3:
-        print('Usage: hci_bridge.py <host-transport-spec> <controller-transport-spec> [command-short-circuit-list]')
-        print('example: python hci_bridge.py udp:0.0.0.0:9000,127.0.0.1:9001 serial:/dev/tty.usbmodem0006839912171,1000000 0x3f:0x0070,0x3f:0x0074,0x3f:0x0077,0x3f:0x0078')
+        print(
+            'Usage: hci_bridge.py <host-transport-spec> <controller-transport-spec> '
+            '[command-short-circuit-list]'
+        )
+        print(
+            'example: python hci_bridge.py udp:0.0.0.0:9000,127.0.0.1:9001 '
+            'serial:/dev/tty.usbmodem0006839912171,1000000 '
+            '0x3f:0x0070,0x3f:0x0074,0x3f:0x0077,0x3f:0x0078'
+        )
         return
 
     print('>>> connecting to HCI...')
-    async with await transport.open_transport_or_link(sys.argv[1]) as (hci_host_source, hci_host_sink):
+    async with await transport.open_transport_or_link(sys.argv[1]) as (
+        hci_host_source,
+        hci_host_sink,
+    ):
         print('>>> connected')
 
         print('>>> connecting to HCI...')
-        async with await transport.open_transport_or_link(sys.argv[2]) as (hci_controller_source, hci_controller_sink):
+        async with await transport.open_transport_or_link(sys.argv[2]) as (
+            hci_controller_source,
+            hci_controller_sink,
+        ):
             print('>>> connected')
 
             command_short_circuits = []
@@ -51,29 +64,36 @@ async def async_main():
                 for op_code_str in sys.argv[3].split(','):
                     if ':' in op_code_str:
                         ogf, ocf = op_code_str.split(':')
-                        command_short_circuits.append(hci.hci_command_op_code(int(ogf, 16), int(ocf, 16)))
+                        command_short_circuits.append(
+                            hci.hci_command_op_code(int(ogf, 16), int(ocf, 16))
+                        )
                     else:
                         command_short_circuits.append(int(op_code_str, 16))
 
             def host_to_controller_filter(hci_packet):
-                if hci_packet.hci_packet_type == hci.HCI_COMMAND_PACKET and hci_packet.op_code in command_short_circuits:
+                if (
+                    hci_packet.hci_packet_type == hci.HCI_COMMAND_PACKET
+                    and hci_packet.op_code in command_short_circuits
+                ):
                     # Respond with a success response
                     logger.debug('short-circuiting packet')
                     response = hci.HCI_Command_Complete_Event(
                         num_hci_command_packets=1,
                         command_opcode=hci_packet.op_code,
-                        return_parameters       = bytes([hci.HCI_SUCCESS])
+                        return_parameters=bytes([hci.HCI_SUCCESS]),
                     )
                     # Return a packet with 'respond to sender' set to True
                     return (response.to_bytes(), True)
 
+                return None
+
             _ = HCI_Bridge(
                 hci_host_source,
                 hci_host_sink,
                 hci_controller_source,
                 hci_controller_sink,
                 host_to_controller_filter,
-                None
+                None,
             )
             await asyncio.get_running_loop().create_future()
 

apps/l2cap_bridge.py

@@ -16,9 +16,9 @@
 # Imports
 # -----------------------------------------------------------------------------
 import asyncio
-import click
 import logging
 import os
+import click
 from colors import color
 
 from bumble.transport import open_transport_or_link
@@ -38,15 +38,8 @@ class ServerBridge:
     and waits for a new L2CAP CoC channel to be connected.
     When the TCP connection is closed by the TCP server, XXXX
     """
-    def __init__(
-        self,
-        psm,
-        max_credits,
-        mtu,
-        mps,
-        tcp_host,
-        tcp_port
-    ):
+
+    def __init__(self, psm, max_credits, mtu, mps, tcp_host, tcp_port):
         self.psm = psm
         self.max_credits = max_credits
         self.mtu = mtu
@@ -61,13 +54,16 @@ class ServerBridge:
             server=self.on_coc,
             max_credits=self.max_credits,
             mtu=self.mtu,
-            mps         = self.mps
+            mps=self.mps,
         )
         print(color(f'### Listening for CoC connection on PSM {self.psm}', 'yellow'))
 
         def on_ble_connection(connection):
             def on_ble_disconnection(reason):
-                print(color('@@@ Bluetooth disconnection:', 'red'), HCI_Constant.error_name(reason))
+                print(
+                    color('@@@ Bluetooth disconnection:', 'red'),
+                    HCI_Constant.error_name(reason),
+                )
 
             print(color('@@@ Bluetooth connection:', 'green'), connection)
             connection.on('disconnection', on_ble_disconnection)
@@ -91,14 +87,20 @@ class ServerBridge:
 
             async def connect_to_tcp(self):
                 # Connect to the TCP server
-                print(color(f'### Connecting to TCP {self.bridge.tcp_host}:{self.bridge.tcp_port}...', 'yellow'))
+                print(
+                    color(
+                        f'### Connecting to TCP {self.bridge.tcp_host}:'
+                        f'{self.bridge.tcp_port}...',
+                        'yellow',
+                    )
+                )
 
                 class TcpClientProtocol(asyncio.Protocol):
                     def __init__(self, pipe):
                         self.pipe = pipe
 
-                    def connection_lost(self, error):
-                        print(color(f'!!! TCP connection lost: {error}', 'red'))
+                    def connection_lost(self, exc):
+                        print(color(f'!!! TCP connection lost: {exc}', 'red'))
                         if self.pipe.l2cap_channel is not None:
                             asyncio.create_task(self.pipe.l2cap_channel.disconnect())
 
@@ -107,7 +109,10 @@ class ServerBridge:
                         self.pipe.l2cap_channel.write(data)
 
                 try:
-                    self.tcp_transport, _ = await asyncio.get_running_loop().create_connection(
+                    (
+                        self.tcp_transport,
+                        _,
+                    ) = await asyncio.get_running_loop().create_connection(
                         lambda: TcpClientProtocol(self),
                         host=self.bridge.tcp_host,
                         port=self.bridge.tcp_port,
@@ -149,16 +154,7 @@ class ClientBridge:
 
     READ_CHUNK_SIZE = 4096
 
-    def __init__(
-        self,
-        psm,
-        max_credits,
-        mtu,
-        mps,
-        address,
-        tcp_host,
-        tcp_port
-    ):
+    def __init__(self, psm, max_credits, mtu, mps, address, tcp_host, tcp_port):
         self.psm = psm
         self.max_credits = max_credits
         self.mtu = mtu
@@ -174,14 +170,17 @@ class ClientBridge:
 
         # Called when the BLE connection is disconnected
         def on_ble_disconnection(reason):
-            print(color('@@@ Bluetooth disconnection:', 'red'), HCI_Constant.error_name(reason))
+            print(
+                color('@@@ Bluetooth disconnection:', 'red'),
+                HCI_Constant.error_name(reason),
+            )
 
         connection.on('disconnection', on_ble_disconnection)
 
         # Called when a TCP connection is established
         async def on_tcp_connection(reader, writer):
-            peername = writer.get_extra_info('peername')
-            print(color(f'<<< TCP connection from {peername}', 'magenta'))
+            peer_name = writer.get_extra_info('peer_name')
+            print(color(f'<<< TCP connection from {peer_name}', 'magenta'))
 
             def on_coc_sdu(sdu):
                 print(color(f'<<< [L2CAP SDU]: {len(sdu)} bytes', 'cyan'))
@@ -199,7 +198,7 @@ class ClientBridge:
                     psm=self.psm,
                     max_credits=self.max_credits,
                     mtu=self.mtu,
-                    mps         = self.mps
+                    mps=self.mps,
                 )
                 print(color('*** L2CAP channel:', 'cyan'), l2cap_channel)
             except Exception as error:
@@ -215,7 +214,7 @@ class ClientBridge:
                 l2cap_channel.pause_reading,
                 l2cap_channel.resume_reading,
                 writer.write,
-                writer.drain
+                writer.drain,
             )
             l2cap_to_tcp_pipe.start()
 
@@ -242,9 +241,13 @@ class ClientBridge:
         await asyncio.start_server(
             on_tcp_connection,
             host=self.tcp_host if self.tcp_host != '_' else None,
-            port=self.tcp_port
+            port=self.tcp_port,
+        )
+        print(
+            color(
+                f'### Listening for TCP connections on port {self.tcp_port}', 'magenta'
+            )
         )
-        print(color(f'### Listening for TCP connections on port {self.tcp_port}', 'magenta'))
 
 
 # -----------------------------------------------------------------------------
@@ -269,10 +272,33 @@ async def run(device_config, hci_transport, bridge):
 @click.option('--device-config', help='Device configuration file', required=True)
 @click.option('--hci-transport', help='HCI transport', required=True)
 @click.option('--psm', help='PSM for L2CAP CoC', type=int, default=1234)
-@click.option('--l2cap-coc-max-credits', help='Maximum L2CAP CoC Credits', type=click.IntRange(1, 65535), default=128)
-@click.option('--l2cap-coc-mtu',         help='L2CAP CoC MTU', type=click.IntRange(23, 65535), default=1022)
-@click.option('--l2cap-coc-mps',         help='L2CAP CoC MPS', type=click.IntRange(23, 65533), default=1024)
-def cli(context, device_config, hci_transport, psm, l2cap_coc_max_credits, l2cap_coc_mtu, l2cap_coc_mps):
+@click.option(
+    '--l2cap-coc-max-credits',
+    help='Maximum L2CAP CoC Credits',
+    type=click.IntRange(1, 65535),
+    default=128,
+)
+@click.option(
+    '--l2cap-coc-mtu',
+    help='L2CAP CoC MTU',
+    type=click.IntRange(23, 65535),
+    default=1022,
+)
+@click.option(
+    '--l2cap-coc-mps',
+    help='L2CAP CoC MPS',
+    type=click.IntRange(23, 65533),
+    default=1024,
+)
+def cli(
+    context,
+    device_config,
+    hci_transport,
+    psm,
+    l2cap_coc_max_credits,
+    l2cap_coc_mtu,
+    l2cap_coc_mps,
+):
     context.ensure_object(dict)
     context.obj['device_config'] = device_config
     context.obj['hci_transport'] = hci_transport
@@ -294,12 +320,9 @@ def server(context, tcp_host, tcp_port):
         context.obj['mtu'],
         context.obj['mps'],
         tcp_host,
-        tcp_port)
-    asyncio.run(run(
-        context.obj['device_config'],
-        context.obj['hci_transport'],
-        bridge
-    ))
+        tcp_port,
+    )
+    asyncio.run(run(context.obj['device_config'], context.obj['hci_transport'], bridge))
 
 
 # -----------------------------------------------------------------------------
@@ -316,16 +339,12 @@ def client(context, bluetooth_address, tcp_host, tcp_port):
         context.obj['mps'],
         bluetooth_address,
         tcp_host,
-        tcp_port
+        tcp_port,
     )
-    asyncio.run(run(
-        context.obj['device_config'],
-        context.obj['hci_transport'],
-        bridge
-    ))
+    asyncio.run(run(context.obj['device_config'], context.obj['hci_transport'], bridge))
 
 
 # -----------------------------------------------------------------------------
 logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'WARNING').upper())
 if __name__ == '__main__':
-    cli(obj={})
+    cli(obj={})  # pylint: disable=no-value-for-parameter

apps/link_relay/link_relay.py

@@ -16,7 +16,6 @@
 # Imports
 # ----------------------------------------------------------------------------
 import sys
-import websockets
 import logging
 import json
 import asyncio
@@ -25,6 +24,7 @@ import uuid
 import os
 from urllib.parse import urlparse
 from colors import color
+import websockets
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -98,7 +98,11 @@ class Connection:
         self.address = address
 
     def __str__(self):
-        return f'Connection(address="{self.address}", client={self.websocket.remote_address[0]}:{self.websocket.remote_address[1]})'
+        return (
+            f'Connection(address="{self.address}", '
+            f'client={self.websocket.remote_address[0]}:'
+            f'{self.websocket.remote_address[1]})'
+        )
 
 
 # ----------------------------------------------------------------------------
@@ -139,13 +143,15 @@ class Room:
 
             # Parse the message to decide how to handle it
             if message.startswith('@'):
-                # This is a targetted message
-                await self.on_targetted_message(connection, message)
+                # This is a targeted message
+                await self.on_targeted_message(connection, message)
             elif message.startswith('/'):
                 # This is an RPC request
                 await self.on_rpc_request(connection, message)
             else:
-                await connection.send_message(f'result:{error_to_json("error: invalid message")}')
+                await connection.send_message(
+                    f'result:{error_to_json("error: invalid message")}'
+                )
 
     async def broadcast_message(self, sender, message):
         '''
@@ -155,7 +161,9 @@ class Room:
 
     async def on_rpc_request(self, connection, message):
         command, *params = message.split(' ', 1)
-        if handler := getattr(self, f'on_{command[1:].lower().replace("-","_")}_command', None):
+        if handler := getattr(
+            self, f'on_{command[1:].lower().replace("-","_")}_command', None
+        ):
             try:
                 result = await handler(connection, params)
             except Exception as error:
@@ -165,7 +173,7 @@ class Room:
 
         await connection.send_message(result or 'result:{}')
 
-    async def on_targetted_message(self, connection, message):
+    async def on_targeted_message(self, connection, message):
         target, *payload = message.split(' ', 1)
         if not payload:
             return error_to_json('missing arguments')
@@ -174,7 +182,8 @@ class Room:
 
         # Determine what targets to send to
         if target == '*':
-            # Send to all connections in the room except the connection from which the message was received
+            # Send to all connections in the room except the connection from which the
+            # message was received
             connections = [c for c in self.connections if c != connection]
         else:
             connections = self.find_connections_by_address(target)
@@ -192,7 +201,9 @@ class Room:
         current_address = connection.address
         new_address = params[0]
         connection.set_address(new_address)
-        await self.broadcast_message(connection, f'address-changed:from={current_address},to={new_address}')
+        await self.broadcast_message(
+            connection, f'address-changed:from={current_address},to={new_address}'
+        )
 
 
 # ----------------------------------------------------------------------------
@@ -210,9 +221,10 @@ class Relay:
     def start(self):
         logger.info(f'Starting Relay on port {self.port}')
 
+        # pylint: disable-next=no-member
         return websockets.serve(self.serve, '0.0.0.0', self.port, ping_interval=None)
 
-    async def serve_as_controller(connection):
+    async def serve_as_controller(self, connection):
         pass
 
     async def serve(self, websocket, path):
@@ -252,15 +264,15 @@ def main():
     arg_parser = argparse.ArgumentParser(description='Bumble Link Relay')
     arg_parser.add_argument('--log-level', default='INFO', help='logger level')
     arg_parser.add_argument('--log-config', help='logger config file (YAML)')
-    arg_parser.add_argument('--port',
-                            type = int,
-                            default = DEFAULT_RELAY_PORT,
-                            help = 'Port to listen on')
+    arg_parser.add_argument(
+        '--port', type=int, default=DEFAULT_RELAY_PORT, help='Port to listen on'
+    )
     args = arg_parser.parse_args()
 
     # Setup logger
     if args.log_config:
-        from logging import config
+        from logging import config  # pylint: disable=import-outside-toplevel
+
         config.fileConfig(args.log_config)
     else:
         logging.basicConfig(level=getattr(logging, args.log_level.upper()))

apps/pair.py

@@ -33,25 +33,27 @@ from bumble.gatt import (
     GATT_GENERIC_ACCESS_SERVICE,
     Service,
     Characteristic,
-    CharacteristicValue
+    CharacteristicValue,
 )
 from bumble.att import (
     ATT_Error,
     ATT_INSUFFICIENT_AUTHENTICATION_ERROR,
-    ATT_INSUFFICIENT_ENCRYPTION_ERROR
+    ATT_INSUFFICIENT_ENCRYPTION_ERROR,
 )
 
 
 # -----------------------------------------------------------------------------
 class Delegate(PairingDelegate):
     def __init__(self, mode, connection, capability_string, prompt):
-        super().__init__({
+        super().__init__(
+            {
                 'keyboard': PairingDelegate.KEYBOARD_INPUT_ONLY,
                 'display': PairingDelegate.DISPLAY_OUTPUT_ONLY,
                 'display+keyboard': PairingDelegate.DISPLAY_OUTPUT_AND_KEYBOARD_INPUT,
                 'display+yes/no': PairingDelegate.DISPLAY_OUTPUT_AND_YES_NO_INPUT,
-            'none':             PairingDelegate.NO_OUTPUT_NO_INPUT
-        }[capability_string.lower()])
+                'none': PairingDelegate.NO_OUTPUT_NO_INPUT,
+            }[capability_string.lower()]
+        )
 
         self.mode = mode
         self.peer = Peer(connection)
@@ -84,15 +86,17 @@ class Delegate(PairingDelegate):
             while True:
                 response = await aioconsole.ainput(color('>>> Accept? ', 'yellow'))
                 response = response.lower().strip()
+
                 if response == 'yes':
                     return True
-                elif response == 'no':
+
+                if response == 'no':
                     return False
-        else:
+
         # Accept silently
         return True
 
-    async def compare_numbers(self, number, digits):
+    async def compare_numbers(self, number, digits=6):
         await self.update_peer_name()
 
         # Wait a bit to allow some of the log lines to print before we prompt
@@ -103,11 +107,17 @@ class Delegate(PairingDelegate):
         print(color(f'### Pairing with {self.peer_name}', 'yellow'))
         print(color('###-----------------------------------', 'yellow'))
         while True:
-            response = await aioconsole.ainput(color(f'>>> Does the other device display {number:0{digits}}? ', 'yellow'))
+            response = await aioconsole.ainput(
+                color(
+                    f'>>> Does the other device display {number:0{digits}}? ', 'yellow'
+                )
+            )
             response = response.lower().strip()
+
             if response == 'yes':
                 return True
-            elif response == 'no':
+
+            if response == 'no':
                 return False
 
     async def get_number(self):
@@ -126,7 +136,7 @@ class Delegate(PairingDelegate):
             except ValueError:
                 pass
 
-    async def display_number(self, number, digits):
+    async def display_number(self, number, digits=6):
         await self.update_peer_name()
 
         # Wait a bit to allow some of the log lines to print before we prompt
@@ -143,16 +153,20 @@ class Delegate(PairingDelegate):
 async def get_peer_name(peer, mode):
     if mode == 'classic':
         return await peer.request_name()
-    else:
+
     # Try to get the peer name from GATT
     services = await peer.discover_service(GATT_GENERIC_ACCESS_SERVICE)
     if not services:
         return None
 
-        values = await peer.read_characteristics_by_uuid(GATT_DEVICE_NAME_CHARACTERISTIC, services[0])
+    values = await peer.read_characteristics_by_uuid(
+        GATT_DEVICE_NAME_CHARACTERISTIC, services[0]
+    )
     if values:
         return values[0].decode('utf-8')
 
+    return None
+
 
 # -----------------------------------------------------------------------------
 AUTHENTICATION_ERROR_RETURNED = [False, False]
@@ -164,12 +178,12 @@ def read_with_error(connection):
 
     if AUTHENTICATION_ERROR_RETURNED[0]:
         return bytes([1])
-    else:
+
     AUTHENTICATION_ERROR_RETURNED[0] = True
     raise ATT_Error(ATT_INSUFFICIENT_AUTHENTICATION_ERROR)
 
 
-def write_with_error(connection, value):
+def write_with_error(connection, _value):
     if not connection.is_encrypted:
         raise ATT_Error(ATT_INSUFFICIENT_ENCRYPTION_ERROR)
 
@@ -190,7 +204,7 @@ def on_connection(connection, request):
     # Listen for encryption changes
     connection.on(
         'connection_encryption_change',
-        lambda: on_connection_encryption_change(connection)
+        lambda: on_connection_encryption_change(connection),
     )
 
     # Request pairing if needed
@@ -202,7 +216,12 @@ def on_connection(connection, request):
 # -----------------------------------------------------------------------------
 def on_connection_encryption_change(connection):
     print(color('@@@-----------------------------------', 'blue'))
-    print(color(f'@@@ Connection is {"" if connection.is_encrypted else "not"}encrypted', 'blue'))
+    print(
+        color(
+            f'@@@ Connection is {"" if connection.is_encrypted else "not"}encrypted',
+            'blue',
+        )
+    )
     print(color('@@@-----------------------------------', 'blue'))
 
 
@@ -241,7 +260,7 @@ async def pair(
     keystore_file,
     device_config,
     hci_transport,
-    address_or_name
+    address_or_name,
 ):
     print('<<< connecting to HCI...')
     async with await open_transport_or_link(hci_transport) as (hci_source, hci_sink):
@@ -272,9 +291,11 @@ async def pair(
                             '552957FB-CF1F-4A31-9535-E78847E1A714',
                             Characteristic.READ | Characteristic.WRITE,
                             Characteristic.READABLE | Characteristic.WRITEABLE,
-                            CharacteristicValue(read=read_with_error, write=write_with_error)
+                            CharacteristicValue(
+                                read=read_with_error, write=write_with_error
+                            ),
                         )
-                    ]
+                    ],
                 )
             )
 
@@ -288,10 +309,7 @@ async def pair(
 
         # Set up a pairing config factory
         device.pairing_config_factory = lambda connection: PairingConfig(
-            sc,
-            mitm,
-            bond,
-            Delegate(mode, connection, io, prompt)
+            sc, mitm, bond, Delegate(mode, connection, io, prompt)
         )
 
         # Connect to a peer or wait for a connection
@@ -319,21 +337,70 @@ async def pair(
 
 # -----------------------------------------------------------------------------
 @click.command()
-@click.option('--mode', type=click.Choice(['le', 'classic']), default='le', show_default=True)
-@click.option('--sc', type=bool, default=True, help='Use the Secure Connections protocol', show_default=True)
-@click.option('--mitm', type=bool, default=True, help='Request MITM protection', show_default=True)
-@click.option('--bond', type=bool, default=True, help='Enable bonding', show_default=True)
-@click.option('--io', type=click.Choice(['keyboard', 'display', 'display+keyboard', 'display+yes/no', 'none']), default='display+keyboard', show_default=True)
+@click.option(
+    '--mode', type=click.Choice(['le', 'classic']), default='le', show_default=True
+)
+@click.option(
+    '--sc',
+    type=bool,
+    default=True,
+    help='Use the Secure Connections protocol',
+    show_default=True,
+)
+@click.option(
+    '--mitm', type=bool, default=True, help='Request MITM protection', show_default=True
+)
+@click.option(
+    '--bond', type=bool, default=True, help='Enable bonding', show_default=True
+)
+@click.option(
+    '--io',
+    type=click.Choice(
+        ['keyboard', 'display', 'display+keyboard', 'display+yes/no', 'none']
+    ),
+    default='display+keyboard',
+    show_default=True,
+)
 @click.option('--prompt', is_flag=True, help='Prompt to accept/reject pairing request')
-@click.option('--request', is_flag=True, help='Request that the connecting peer initiate pairing')
+@click.option(
+    '--request', is_flag=True, help='Request that the connecting peer initiate pairing'
+)
 @click.option('--print-keys', is_flag=True, help='Print the bond keys before pairing')
 @click.option('--keystore-file', help='File in which to store the pairing keys')
 @click.argument('device-config')
 @click.argument('hci_transport')
 @click.argument('address-or-name', required=False)
-def main(mode, sc, mitm, bond, io, prompt, request, print_keys, keystore_file, device_config, hci_transport, address_or_name):
+def main(
+    mode,
+    sc,
+    mitm,
+    bond,
+    io,
+    prompt,
+    request,
+    print_keys,
+    keystore_file,
+    device_config,
+    hci_transport,
+    address_or_name,
+):
     logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
-    asyncio.run(pair(mode, sc, mitm, bond, io, prompt, request, print_keys, keystore_file, device_config, hci_transport, address_or_name))
+    asyncio.run(
+        pair(
+            mode,
+            sc,
+            mitm,
+            bond,
+            io,
+            prompt,
+            request,
+            print_keys,
+            keystore_file,
+            device_config,
+            hci_transport,
+            address_or_name,
+        )
+    )
 
 
 # -----------------------------------------------------------------------------

apps/scan.py

@@ -63,7 +63,9 @@ class AdvertisementPrinter:
                 resolution_qualifier = f'(resolved from {advertisement.address})'
                 address = resolved
 
-        address_type_string = ('PUBLIC', 'RANDOM', 'PUBLIC_ID', 'RANDOM_ID')[address.address_type]
+        address_type_string = ('PUBLIC', 'RANDOM', 'PUBLIC_ID', 'RANDOM_ID')[
+            address.address_type
+        ]
         if address.is_public:
             type_color = 'cyan'
         else:
@@ -90,10 +92,12 @@ class AdvertisementPrinter:
 
         print(
             f'>>> {color(address, address_color)} '
-            f'[{color(address_type_string, type_color)}]{address_qualifier}{resolution_qualifier}:{separator}'
+            f'[{color(address_type_string, type_color)}]{address_qualifier}'
+            f'{resolution_qualifier}:{separator}'
             f'{phy_info}'
             f'RSSI:{advertisement.rssi:4} {rssi_bar}{separator}'
-            f'{advertisement.data.to_string(separator)}\n')
+            f'{advertisement.data.to_string(separator)}\n'
+        )
 
     def on_advertisement(self, advertisement):
         self.print_advertisement(advertisement)
@@ -114,16 +118,20 @@ async def scan(
     raw,
     keystore_file,
     device_config,
-    transport
+    transport,
 ):
     print('<<< connecting to HCI...')
     async with await open_transport_or_link(transport) as (hci_source, hci_sink):
         print('<<< connected')
 
         if device_config:
-            device = Device.from_config_file_with_hci(device_config, hci_source, hci_sink)
+            device = Device.from_config_file_with_hci(
+                device_config, hci_source, hci_sink
+            )
         else:
-            device = Device.with_hci('Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink)
+            device = Device.with_hci(
+                'Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink
+            )
 
         if keystore_file:
             keystore = JsonKeyStore(namespace=None, filename=keystore_file)
@@ -153,7 +161,7 @@ async def scan(
             scan_interval=scan_interval,
             scan_window=scan_window,
             filter_duplicates=filter_duplicates,
-            scanning_phys=scanning_phys
+            scanning_phys=scanning_phys,
         )
 
         await hci_source.wait_for_termination()
@@ -165,15 +173,51 @@ async def scan(
 @click.option('--passive', is_flag=True, default=False, help='Perform passive scanning')
 @click.option('--scan-interval', type=int, default=60, help='Scan interval')
 @click.option('--scan-window', type=int, default=60, help='Scan window')
-@click.option('--phy', type=click.Choice(['1m', 'coded']), help='Only scan on the specified PHY')
-@click.option('--filter-duplicates', type=bool, default=True, help='Filter duplicates at the controller level')
-@click.option('--raw', is_flag=True, default=False, help='Listen for raw advertising reports instead of processed ones')
+@click.option(
+    '--phy', type=click.Choice(['1m', 'coded']), help='Only scan on the specified PHY'
+)
+@click.option(
+    '--filter-duplicates',
+    type=bool,
+    default=True,
+    help='Filter duplicates at the controller level',
+)
+@click.option(
+    '--raw',
+    is_flag=True,
+    default=False,
+    help='Listen for raw advertising reports instead of processed ones',
+)
 @click.option('--keystore-file', help='Keystore file to use when resolving addresses')
 @click.option('--device-config', help='Device config file for the scanning device')
 @click.argument('transport')
-def main(min_rssi, passive, scan_interval, scan_window, phy, filter_duplicates, raw, keystore_file, device_config, transport):
+def main(
+    min_rssi,
+    passive,
+    scan_interval,
+    scan_window,
+    phy,
+    filter_duplicates,
+    raw,
+    keystore_file,
+    device_config,
+    transport,
+):
     logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'WARNING').upper())
-    asyncio.run(scan(min_rssi, passive, scan_interval, scan_window, phy, filter_duplicates, raw, keystore_file, device_config, transport))
+    asyncio.run(
+        scan(
+            min_rssi,
+            passive,
+            scan_interval,
+            scan_window,
+            phy,
+            filter_duplicates,
+            raw,
+            keystore_file,
+            device_config,
+            transport,
+        )
+    )
 
 
 # -----------------------------------------------------------------------------

apps/show.py

@@ -27,7 +27,8 @@ from bumble.helpers import PacketTracer
 # -----------------------------------------------------------------------------
 class SnoopPacketReader:
     '''
-    Reader that reads HCI packets from a "snoop" file (based on RFC 1761, but not exactly the same...)
+    Reader that reads HCI packets from a "snoop" file (based on RFC 1761, but not
+    exactly the same...)
     '''
 
     DATALINK_H1 = 1001
@@ -41,9 +42,13 @@ class SnoopPacketReader:
         # Read the header
         identification_pattern = source.read(8)
         if identification_pattern.hex().lower() != '6274736e6f6f7000':
-            raise ValueError('not a valid snoop file, unexpected identification pattern')
-        (self.version_number, self.data_link_type) = struct.unpack('>II', source.read(8))
-        if self.data_link_type != self.DATALINK_H4 and self.data_link_type != self.DATALINK_H1:
+            raise ValueError(
+                'not a valid snoop file, unexpected identification pattern'
+            )
+        (self.version_number, self.data_link_type) = struct.unpack(
+            '>II', source.read(8)
+        )
+        if self.data_link_type not in (self.DATALINK_H4, self.DATALINK_H1):
             raise ValueError(f'datalink type {self.data_link_type} not supported')
 
     def next_packet(self):
@@ -55,9 +60,9 @@ class SnoopPacketReader:
             original_length,
             included_length,
             packet_flags,
-            cumulative_drops,
-            timestamp_seconds,
-            timestamp_microsecond
+            _cumulative_drops,
+            _timestamp_seconds,
+            _timestamp_microsecond,
         ) = struct.unpack('>IIIIII', header)
 
         # Abort on truncated packets
@@ -79,8 +84,11 @@ class SnoopPacketReader:
                 else:
                     packet_type = hci.HCI_ACL_DATA_PACKET
 
-            return (packet_flags & 1, bytes([packet_type]) + self.source.read(included_length))
-        else:
+            return (
+                packet_flags & 1,
+                bytes([packet_type]) + self.source.read(included_length),
+            )
+
         return (packet_flags & 1, self.source.read(included_length))
 
 
@@ -88,15 +96,22 @@ class SnoopPacketReader:
 # Main
 # -----------------------------------------------------------------------------
 @click.command()
-@click.option('--format', type=click.Choice(['h4', 'snoop']), default='h4', help='Format of the input file')
+@click.option(
+    '--format',
+    type=click.Choice(['h4', 'snoop']),
+    default='h4',
+    help='Format of the input file',
+)
 @click.argument('filename')
+# pylint: disable=redefined-builtin
 def main(format, filename):
     input = open(filename, 'rb')
     if format == 'h4':
         packet_reader = PacketReader(input)
 
         def read_next_packet():
-            (0, packet_reader.next_packet())
+            return (0, packet_reader.next_packet())
+
     else:
         packet_reader = SnoopPacketReader(input)
         read_next_packet = packet_reader.next_packet
@@ -112,9 +127,8 @@ def main(format, filename):
 
         except Exception as error:
             print(color(f'!!! {error}', 'red'))
-            pass
 
 
 # -----------------------------------------------------------------------------
 if __name__ == '__main__':
-    main()
+    main()  # pylint: disable=no-value-for-parameter

apps/usb_probe.py

@@ -28,11 +28,12 @@
 # -----------------------------------------------------------------------------
 import os
 import logging
-import sys
 import click
 import usb1
 from colors import color
 
+from bumble.transport.usb import load_libusb
+
 
 # -----------------------------------------------------------------------------
 # Constants
@@ -69,13 +70,13 @@ USB_DEVICE_CLASSES = {
                 0x01: 'Bluetooth',
                 0x02: 'UWB',
                 0x03: 'Remote NDIS',
-                0x04: 'Bluetooth AMP'
-            }
+                0x04: 'Bluetooth AMP',
             }
+        },
     ),
     0xEF: 'Miscellaneous',
     0xFE: 'Application Specific',
-    0xFF: 'Vendor Specific'
+    0xFF: 'Vendor Specific',
 }
 
 USB_ENDPOINT_IN = 0x80
@@ -84,7 +85,7 @@ USB_ENDPOINT_TYPES = ['CONTROL', 'ISOCHRONOUS', 'BULK', 'INTERRUPT']
 USB_BT_HCI_CLASS_TUPLE = (
     USB_DEVICE_CLASS_WIRELESS_CONTROLLER,
     USB_DEVICE_SUBCLASS_RF_CONTROLLER,
-    USB_DEVICE_PROTOCOL_BLUETOOTH_PRIMARY_CONTROLLER
+    USB_DEVICE_PROTOCOL_BLUETOOTH_PRIMARY_CONTROLLER,
 )
 
 
@@ -94,19 +95,26 @@ def show_device_details(device):
         print(f'  Configuration {configuration.getConfigurationValue()}')
         for interface in configuration:
             for setting in interface:
-                alternateSetting = setting.getAlternateSetting()
-                suffix = f'/{alternateSetting}' if interface.getNumSettings() > 1 else ''
+                alternate_setting = setting.getAlternateSetting()
+                suffix = (
+                    f'/{alternate_setting}' if interface.getNumSettings() > 1 else ''
+                )
                 (class_string, subclass_string) = get_class_info(
-                    setting.getClass(),
-                    setting.getSubClass(),
-                    setting.getProtocol()
+                    setting.getClass(), setting.getSubClass(), setting.getProtocol()
                 )
                 details = f'({class_string}, {subclass_string})'
                 print(f'      Interface: {setting.getNumber()}{suffix} {details}')
                 for endpoint in setting:
                     endpoint_type = USB_ENDPOINT_TYPES[endpoint.getAttributes() & 3]
-                    endpoint_direction = 'OUT' if (endpoint.getAddress() & USB_ENDPOINT_IN == 0) else 'IN'
-                    print(f'        Endpoint 0x{endpoint.getAddress():02X}: {endpoint_type} {endpoint_direction}')
+                    endpoint_direction = (
+                        'OUT'
+                        if (endpoint.getAddress() & USB_ENDPOINT_IN == 0)
+                        else 'IN'
+                    )
+                    print(
+                        f'        Endpoint 0x{endpoint.getAddress():02X}: '
+                        f'{endpoint_type} {endpoint_direction}'
+                    )
 
 
 # -----------------------------------------------------------------------------
@@ -116,7 +124,7 @@ def get_class_info(cls, subclass, protocol):
     if class_info is None:
         class_string = f'0x{cls:02X}'
     else:
-        if type(class_info) is tuple:
+        if isinstance(class_info, tuple):
             class_string = class_info[0]
             subclass_info = class_info[1].get(subclass)
             if subclass_info:
@@ -135,7 +143,11 @@ def get_class_info(cls, subclass, protocol):
 # -----------------------------------------------------------------------------
 def is_bluetooth_hci(device):
     # Check if the device class indicates a match
-    if (device.getDeviceClass(), device.getDeviceSubClass(), device.getDeviceProtocol()) == USB_BT_HCI_CLASS_TUPLE:
+    if (
+        device.getDeviceClass(),
+        device.getDeviceSubClass(),
+        device.getDeviceProtocol(),
+    ) == USB_BT_HCI_CLASS_TUPLE:
         return True
 
     # If the device class is 'Device', look for a matching interface
@@ -143,7 +155,11 @@ def is_bluetooth_hci(device):
         for configuration in device:
             for interface in configuration:
                 for setting in interface:
-                    if (setting.getClass(), setting.getSubClass(), setting.getProtocol()) == USB_BT_HCI_CLASS_TUPLE:
+                    if (
+                        setting.getClass(),
+                        setting.getSubClass(),
+                        setting.getProtocol(),
+                    ) == USB_BT_HCI_CLASS_TUPLE:
                         return True
 
     return False
@@ -155,6 +171,7 @@ def is_bluetooth_hci(device):
 def main(verbose):
     logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'WARNING').upper())
 
+    load_libusb()
     with usb1.USBContext() as context:
         bluetooth_device_count = 0
         devices = {}
@@ -167,9 +184,7 @@ def main(verbose):
             device_id = (device.getVendorID(), device.getProductID())
 
             (device_class_string, device_subclass_string) = get_class_info(
-                device_class,
-                device_subclass,
-                device_protocol
+                device_class, device_subclass, device_protocol
             )
 
             try:
@@ -198,7 +213,9 @@ def main(verbose):
 
             # Compute the different ways this can be referenced as a Bumble transport
             bumble_transport_names = []
-            basic_transport_name = f'usb:{device.getVendorID():04X}:{device.getProductID():04X}'
+            basic_transport_name = (
+                f'usb:{device.getVendorID():04X}:{device.getProductID():04X}'
+            )
 
             if device_is_bluetooth_hci:
                 bumble_transport_names.append(f'usb:{bluetooth_device_count - 1}')
@@ -206,17 +223,39 @@ def main(verbose):
             if device_id not in devices:
                 bumble_transport_names.append(basic_transport_name)
             else:
-                bumble_transport_names.append(f'{basic_transport_name}#{len(devices[device_id])}')
+                bumble_transport_names.append(
+                    f'{basic_transport_name}#{len(devices[device_id])}'
+                )
 
             if device_serial_number is not None:
-                if device_id not in devices or device_serial_number not in devices[device_id]:
-                    bumble_transport_names.append(f'{basic_transport_name}/{device_serial_number}')
+                if (
+                    device_id not in devices
+                    or device_serial_number not in devices[device_id]
+                ):
+                    bumble_transport_names.append(
+                        f'{basic_transport_name}/{device_serial_number}'
+                    )
 
             # Print the results
-            print(color(f'ID {device.getVendorID():04X}:{device.getProductID():04X}', fg=fg_color, bg=bg_color))
+            print(
+                color(
+                    f'ID {device.getVendorID():04X}:{device.getProductID():04X}',
+                    fg=fg_color,
+                    bg=bg_color,
+                )
+            )
             if bumble_transport_names:
-                print(color('  Bumble Transport Names:', 'blue'), ' or '.join(color(x, 'cyan' if device_is_bluetooth_hci else 'red') for x in bumble_transport_names))
-            print(color('  Bus/Device:            ', 'green'), f'{device.getBusNumber():03}/{device.getDeviceAddress():03}')
+                print(
+                    color('  Bumble Transport Names:', 'blue'),
+                    ' or '.join(
+                        color(x, 'cyan' if device_is_bluetooth_hci else 'red')
+                        for x in bumble_transport_names
+                    ),
+                )
+            print(
+                color('  Bus/Device:            ', 'green'),
+                f'{device.getBusNumber():03}/{device.getDeviceAddress():03}',
+            )
             print(color('  Class:                 ', 'green'), device_class_string)
             print(color('  Subclass/Protocol:     ', 'green'), device_subclass_string)
             if device_serial_number is not None:
@@ -236,4 +275,4 @@ def main(verbose):
 
 # -----------------------------------------------------------------------------
 if __name__ == '__main__':
-    main()
+    main()  # pylint: disable=no-value-for-parameter

bumble/__init__.py

@@ -0,0 +1,4 @@
+try:
+    from ._version import version as __version__
+except ImportError:
+    __version__ = "unknown version"

bumble/a2dp.py

@@ -16,10 +16,9 @@
 # Imports
 # -----------------------------------------------------------------------------
 import struct
-import bitstruct
 import logging
 from collections import namedtuple
-from colors import color
+import bitstruct
 
 from .company_ids import COMPANY_IDENTIFIERS
 from .sdp import (
@@ -30,7 +29,7 @@ from .sdp import (
     SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
     SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
     SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-    SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID
+    SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
 )
 from .core import (
     BT_L2CAP_PROTOCOL_ID,
@@ -38,7 +37,7 @@ from .core import (
     BT_AUDIO_SINK_SERVICE,
     BT_AVDTP_PROTOCOL_ID,
     BT_ADVANCED_AUDIO_DISTRIBUTION_SERVICE,
-    name_or_number
+    name_or_number,
 )
 
 
@@ -51,6 +50,7 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
 
 A2DP_SBC_CODEC_TYPE            = 0x00
 A2DP_MPEG_1_2_AUDIO_CODEC_TYPE = 0x01
@@ -127,71 +127,115 @@ MPEG_2_4_OBJECT_TYPE_NAMES = {
     MPEG_4_AAC_SCALABLE_OBJECT_TYPE: 'MPEG_4_AAC_SCALABLE_OBJECT_TYPE'
 }
 
+# fmt: on
+
 
 # -----------------------------------------------------------------------------
 def flags_to_list(flags, values):
     result = []
-    for i in range(len(values)):
+    for i, value in enumerate(values):
         if flags & (1 << (len(values) - i - 1)):
-            result.append(values[i])
+            result.append(value)
     return result
 
 
 # -----------------------------------------------------------------------------
 def make_audio_source_service_sdp_records(service_record_handle, version=(1, 3)):
+    # pylint: disable=import-outside-toplevel
     from .avdtp import AVDTP_PSM
+
     version_int = version[0] << 8 | version[1]
     return [
-        ServiceAttribute(SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID, DataElement.unsigned_integer_32(service_record_handle)),
-        ServiceAttribute(SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID, DataElement.sequence([
-            DataElement.uuid(SDP_PUBLIC_BROWSE_ROOT)
-        ])),
-        ServiceAttribute(SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID, DataElement.sequence([
-            DataElement.uuid(BT_AUDIO_SOURCE_SERVICE)
-        ])),
-        ServiceAttribute(SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID, DataElement.sequence([
-            DataElement.sequence([
+        ServiceAttribute(
+            SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+            DataElement.unsigned_integer_32(service_record_handle),
+        ),
+        ServiceAttribute(
+            SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID,
+            DataElement.sequence([DataElement.uuid(SDP_PUBLIC_BROWSE_ROOT)]),
+        ),
+        ServiceAttribute(
+            SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
+            DataElement.sequence([DataElement.uuid(BT_AUDIO_SOURCE_SERVICE)]),
+        ),
+        ServiceAttribute(
+            SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+            DataElement.sequence(
+                [
+                    DataElement.sequence(
+                        [
                             DataElement.uuid(BT_L2CAP_PROTOCOL_ID),
-                DataElement.unsigned_integer_16(AVDTP_PSM)
-            ]),
-            DataElement.sequence([
+                            DataElement.unsigned_integer_16(AVDTP_PSM),
+                        ]
+                    ),
+                    DataElement.sequence(
+                        [
                             DataElement.uuid(BT_AVDTP_PROTOCOL_ID),
-                DataElement.unsigned_integer_16(version_int)
-            ])
-        ])),
-        ServiceAttribute(SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID, DataElement.sequence([
+                            DataElement.unsigned_integer_16(version_int),
+                        ]
+                    ),
+                ]
+            ),
+        ),
+        ServiceAttribute(
+            SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+            DataElement.sequence(
+                [
                     DataElement.uuid(BT_ADVANCED_AUDIO_DISTRIBUTION_SERVICE),
-            DataElement.unsigned_integer_16(version_int)
-        ])),
+                    DataElement.unsigned_integer_16(version_int),
+                ]
+            ),
+        ),
     ]
 
 
 # -----------------------------------------------------------------------------
 def make_audio_sink_service_sdp_records(service_record_handle, version=(1, 3)):
+    # pylint: disable=import-outside-toplevel
     from .avdtp import AVDTP_PSM
+
     version_int = version[0] << 8 | version[1]
     return [
-        ServiceAttribute(SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID, DataElement.unsigned_integer_32(service_record_handle)),
-        ServiceAttribute(SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID, DataElement.sequence([
-            DataElement.uuid(SDP_PUBLIC_BROWSE_ROOT)
-        ])),
-        ServiceAttribute(SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID, DataElement.sequence([
-            DataElement.uuid(BT_AUDIO_SINK_SERVICE)
-        ])),
-        ServiceAttribute(SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID, DataElement.sequence([
-            DataElement.sequence([
+        ServiceAttribute(
+            SDP_SERVICE_RECORD_HANDLE_ATTRIBUTE_ID,
+            DataElement.unsigned_integer_32(service_record_handle),
+        ),
+        ServiceAttribute(
+            SDP_BROWSE_GROUP_LIST_ATTRIBUTE_ID,
+            DataElement.sequence([DataElement.uuid(SDP_PUBLIC_BROWSE_ROOT)]),
+        ),
+        ServiceAttribute(
+            SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
+            DataElement.sequence([DataElement.uuid(BT_AUDIO_SINK_SERVICE)]),
+        ),
+        ServiceAttribute(
+            SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+            DataElement.sequence(
+                [
+                    DataElement.sequence(
+                        [
                             DataElement.uuid(BT_L2CAP_PROTOCOL_ID),
-                DataElement.unsigned_integer_16(AVDTP_PSM)
-            ]),
-            DataElement.sequence([
+                            DataElement.unsigned_integer_16(AVDTP_PSM),
+                        ]
+                    ),
+                    DataElement.sequence(
+                        [
                             DataElement.uuid(BT_AVDTP_PROTOCOL_ID),
-                DataElement.unsigned_integer_16(version_int)
-            ])
-        ])),
-        ServiceAttribute(SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID, DataElement.sequence([
+                            DataElement.unsigned_integer_16(version_int),
+                        ]
+                    ),
+                ]
+            ),
+        ),
+        ServiceAttribute(
+            SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
+            DataElement.sequence(
+                [
                     DataElement.uuid(BT_ADVANCED_AUDIO_DISTRIBUTION_SERVICE),
-            DataElement.unsigned_integer_16(version_int)
-        ])),
+                    DataElement.unsigned_integer_16(version_int),
+                ]
+            ),
+        ),
     ]
 
 
@@ -206,8 +250,8 @@ class SbcMediaCodecInformation(
             'subbands',
             'allocation_method',
             'minimum_bitpool_value',
-            'maximum_bitpool_value'
-        ]
+            'maximum_bitpool_value',
+        ],
     )
 ):
     '''
@@ -215,36 +259,25 @@ class SbcMediaCodecInformation(
     '''
 
     BIT_FIELDS = 'u4u4u4u2u2u8u8'
-    SAMPLING_FREQUENCY_BITS = {
-        16000: 1 << 3,
-        32000: 1 << 2,
-        44100: 1 << 1,
-        48000: 1
-    }
+    SAMPLING_FREQUENCY_BITS = {16000: 1 << 3, 32000: 1 << 2, 44100: 1 << 1, 48000: 1}
     CHANNEL_MODE_BITS = {
         SBC_MONO_CHANNEL_MODE: 1 << 3,
         SBC_DUAL_CHANNEL_MODE: 1 << 2,
         SBC_STEREO_CHANNEL_MODE: 1 << 1,
-        SBC_JOINT_STEREO_CHANNEL_MODE: 1
-    }
-    BLOCK_LENGTH_BITS = {
-        4:  1 << 3,
-        8:  1 << 2,
-        12: 1 << 1,
-        16: 1
-    }
-    SUBBANDS_BITS = {
-        4: 1 << 1,
-        8: 1
+        SBC_JOINT_STEREO_CHANNEL_MODE: 1,
     }
+    BLOCK_LENGTH_BITS = {4: 1 << 3, 8: 1 << 2, 12: 1 << 1, 16: 1}
+    SUBBANDS_BITS = {4: 1 << 1, 8: 1}
     ALLOCATION_METHOD_BITS = {
         SBC_SNR_ALLOCATION_METHOD: 1 << 1,
-        SBC_LOUDNESS_ALLOCATION_METHOD: 1
+        SBC_LOUDNESS_ALLOCATION_METHOD: 1,
     }
 
     @staticmethod
     def from_bytes(data):
-        return SbcMediaCodecInformation(*bitstruct.unpack(SbcMediaCodecInformation.BIT_FIELDS, data))
+        return SbcMediaCodecInformation(
+            *bitstruct.unpack(SbcMediaCodecInformation.BIT_FIELDS, data)
+        )
 
     @classmethod
     def from_discrete_values(
@@ -255,7 +288,7 @@ class SbcMediaCodecInformation(
         subbands,
         allocation_method,
         minimum_bitpool_value,
-        maximum_bitpool_value
+        maximum_bitpool_value,
     ):
         return SbcMediaCodecInformation(
             sampling_frequency=cls.SAMPLING_FREQUENCY_BITS[sampling_frequency],
@@ -264,7 +297,7 @@ class SbcMediaCodecInformation(
             subbands=cls.SUBBANDS_BITS[subbands],
             allocation_method=cls.ALLOCATION_METHOD_BITS[allocation_method],
             minimum_bitpool_value=minimum_bitpool_value,
-            maximum_bitpool_value = maximum_bitpool_value
+            maximum_bitpool_value=maximum_bitpool_value,
         )
 
     @classmethod
@@ -276,16 +309,20 @@ class SbcMediaCodecInformation(
         subbands,
         allocation_methods,
         minimum_bitpool_value,
-        maximum_bitpool_value
+        maximum_bitpool_value,
     ):
         return SbcMediaCodecInformation(
-            sampling_frequency    = sum(cls.SAMPLING_FREQUENCY_BITS[x] for x in sampling_frequencies),
+            sampling_frequency=sum(
+                cls.SAMPLING_FREQUENCY_BITS[x] for x in sampling_frequencies
+            ),
             channel_mode=sum(cls.CHANNEL_MODE_BITS[x] for x in channel_modes),
             block_length=sum(cls.BLOCK_LENGTH_BITS[x] for x in block_lengths),
             subbands=sum(cls.SUBBANDS_BITS[x] for x in subbands),
-            allocation_method     = sum(cls.ALLOCATION_METHOD_BITS[x] for x in allocation_methods),
+            allocation_method=sum(
+                cls.ALLOCATION_METHOD_BITS[x] for x in allocation_methods
+            ),
             minimum_bitpool_value=minimum_bitpool_value,
-            maximum_bitpool_value = maximum_bitpool_value
+            maximum_bitpool_value=maximum_bitpool_value,
         )
 
     def __bytes__(self):
@@ -294,7 +331,9 @@ class SbcMediaCodecInformation(
     def __str__(self):
         channel_modes = ['MONO', 'DUAL_CHANNEL', 'STEREO', 'JOINT_STEREO']
         allocation_methods = ['SNR', 'Loudness']
-        return '\n'.join([
+        return '\n'.join(
+            # pylint: disable=line-too-long
+            [
                 'SbcMediaCodecInformation(',
                 f'  sampling_frequency:    {",".join([str(x) for x in flags_to_list(self.sampling_frequency, SBC_SAMPLING_FREQUENCIES)])}',
                 f'  channel_mode:          {",".join([str(x) for x in flags_to_list(self.channel_mode, channel_modes)])}',
@@ -302,22 +341,16 @@ class SbcMediaCodecInformation(
                 f'  subbands:              {",".join([str(x) for x in flags_to_list(self.subbands, SBC_SUBBANDS)])}',
                 f'  allocation_method:     {",".join([str(x) for x in flags_to_list(self.allocation_method, allocation_methods)])}',
                 f'  minimum_bitpool_value: {self.minimum_bitpool_value}',
-            f'  maximum_bitpool_value: {self.maximum_bitpool_value}'
-            ')'
-        ])
+                f'  maximum_bitpool_value: {self.maximum_bitpool_value}' ')',
+            ]
+        )
 
 
 # -----------------------------------------------------------------------------
 class AacMediaCodecInformation(
     namedtuple(
         'AacMediaCodecInformation',
-        [
-            'object_type',
-            'sampling_frequency',
-            'channels',
-            'vbr',
-            'bitrate'
-        ]
+        ['object_type', 'sampling_frequency', 'channels', 'vbr', 'bitrate'],
     )
 ):
     '''
@@ -329,7 +362,7 @@ class AacMediaCodecInformation(
         MPEG_2_AAC_LC_OBJECT_TYPE: 1 << 7,
         MPEG_4_AAC_LC_OBJECT_TYPE: 1 << 6,
         MPEG_4_AAC_LTP_OBJECT_TYPE: 1 << 5,
-        MPEG_4_AAC_SCALABLE_OBJECT_TYPE: 1 << 4
+        MPEG_4_AAC_SCALABLE_OBJECT_TYPE: 1 << 4,
     }
     SAMPLING_FREQUENCY_BITS = {
         8000: 1 << 11,
@@ -343,66 +376,66 @@ class AacMediaCodecInformation(
         48000: 1 << 3,
         64000: 1 << 2,
         88200: 1 << 1,
-        96000: 1
-    }
-    CHANNELS_BITS = {
-        1: 1 << 1,
-        2: 1
+        96000: 1,
     }
+    CHANNELS_BITS = {1: 1 << 1, 2: 1}
 
     @staticmethod
     def from_bytes(data):
-        return AacMediaCodecInformation(*bitstruct.unpack(AacMediaCodecInformation.BIT_FIELDS, data))
+        return AacMediaCodecInformation(
+            *bitstruct.unpack(AacMediaCodecInformation.BIT_FIELDS, data)
+        )
 
     @classmethod
     def from_discrete_values(
-        cls,
-        object_type,
-        sampling_frequency,
-        channels,
-        vbr,
-        bitrate
+        cls, object_type, sampling_frequency, channels, vbr, bitrate
     ):
         return AacMediaCodecInformation(
             object_type=cls.OBJECT_TYPE_BITS[object_type],
             sampling_frequency=cls.SAMPLING_FREQUENCY_BITS[sampling_frequency],
             channels=cls.CHANNELS_BITS[channels],
             vbr=vbr,
-            bitrate               = bitrate
+            bitrate=bitrate,
         )
 
     @classmethod
-    def from_lists(
-        cls,
-        object_types,
-        sampling_frequencies,
-        channels,
-        vbr,
-        bitrate
-    ):
+    def from_lists(cls, object_types, sampling_frequencies, channels, vbr, bitrate):
         return AacMediaCodecInformation(
             object_type=sum(cls.OBJECT_TYPE_BITS[x] for x in object_types),
-            sampling_frequency    = sum(cls.SAMPLING_FREQUENCY_BITS[x] for x in sampling_frequencies),
+            sampling_frequency=sum(
+                cls.SAMPLING_FREQUENCY_BITS[x] for x in sampling_frequencies
+            ),
             channels=sum(cls.CHANNELS_BITS[x] for x in channels),
             vbr=vbr,
-            bitrate               = bitrate
+            bitrate=bitrate,
         )
 
     def __bytes__(self):
         return bitstruct.pack(self.BIT_FIELDS, *self)
 
     def __str__(self):
-        object_types = ['MPEG_2_AAC_LC', 'MPEG_4_AAC_LC', 'MPEG_4_AAC_LTP', 'MPEG_4_AAC_SCALABLE', '[4]', '[5]', '[6]', '[7]']
+        object_types = [
+            'MPEG_2_AAC_LC',
+            'MPEG_4_AAC_LC',
+            'MPEG_4_AAC_LTP',
+            'MPEG_4_AAC_SCALABLE',
+            '[4]',
+            '[5]',
+            '[6]',
+            '[7]',
+        ]
         channels = [1, 2]
-        return '\n'.join([
+        # pylint: disable=line-too-long
+        return '\n'.join(
+            [
                 'AacMediaCodecInformation(',
                 f'  object_type:        {",".join([str(x) for x in flags_to_list(self.object_type, object_types)])}',
                 f'  sampling_frequency: {",".join([str(x) for x in flags_to_list(self.sampling_frequency, MPEG_2_4_AAC_SAMPLING_FREQUENCIES)])}',
                 f'  channels:           {",".join([str(x) for x in flags_to_list(self.channels, channels)])}',
                 f'  vbr:                {self.vbr}',
-            f'  bitrate:            {self.bitrate}'
-            ')'
-        ])
+                f'  bitrate:            {self.bitrate}' ')',
+            ]
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -425,24 +458,21 @@ class VendorSpecificMediaCodecInformation:
         return struct.pack('<IH', self.vendor_id, self.codec_id, self.value)
 
     def __str__(self):
-        return '\n'.join([
+        # pylint: disable=line-too-long
+        return '\n'.join(
+            [
                 'VendorSpecificMediaCodecInformation(',
                 f'  vendor_id: {self.vendor_id:08X} ({name_or_number(COMPANY_IDENTIFIERS, self.vendor_id & 0xFFFF)})',
                 f'  codec_id:  {self.codec_id:04X}',
-            f'  value:     {self.value.hex()}'
-            ')'
-        ])
+                f'  value:     {self.value.hex()}' ')',
+            ]
+        )
 
 
 # -----------------------------------------------------------------------------
 class SbcFrame:
     def __init__(
-        self,
-        sampling_frequency,
-        block_count,
-        channel_mode,
-        subband_count,
-        payload
+        self, sampling_frequency, block_count, channel_mode, subband_count, payload
     ):
         self.sampling_frequency = sampling_frequency
         self.block_count = block_count
@@ -463,7 +493,13 @@ class SbcFrame:
         return self.sample_count / self.sampling_frequency
 
     def __str__(self):
-        return f'SBC(sf={self.sampling_frequency},cm={self.channel_mode},br={self.bitrate},sc={self.sample_count},size={len(self.payload)})'
+        return (
+            f'SBC(sf={self.sampling_frequency},'
+            f'cm={self.channel_mode},'
+            f'br={self.bitrate},'
+            f'sc={self.sample_count},'
+            f'size={len(self.payload)})'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -498,13 +534,19 @@ class SbcParser:
                 if channel_mode in (SBC_MONO_CHANNEL_MODE, SBC_DUAL_CHANNEL_MODE):
                     frame_length += (blocks * channels * bitpool) // 8
                 else:
-                    frame_length += ((1 if channel_mode == SBC_JOINT_STEREO_CHANNEL_MODE else 0) * subbands + blocks * bitpool) // 8
+                    frame_length += (
+                        (1 if channel_mode == SBC_JOINT_STEREO_CHANNEL_MODE else 0)
+                        * subbands
+                        + blocks * bitpool
+                    ) // 8
 
                 # Read the rest of the frame
                 payload = header + await self.read(frame_length - 4)
 
                 # Emit the next frame
-                yield SbcFrame(sampling_frequency, blocks, channel_mode, subbands, payload)
+                yield SbcFrame(
+                    sampling_frequency, blocks, channel_mode, subbands, payload
+                )
 
         return generate_frames()
 
@@ -519,6 +561,7 @@ class SbcPacketSource:
     @property
     def packets(self):
         async def generate_packets():
+            # pylint: disable=import-outside-toplevel
             from .avdtp import MediaPacket  # Import here to avoid a circular reference
 
             sequence_number = 0
@@ -532,18 +575,25 @@ class SbcPacketSource:
             async for frame in sbc_parser.frames:
                 print(frame)
 
-                if frames_size + len(frame.payload) > max_rtp_payload or len(frames) == 16:
+                if (
+                    frames_size + len(frame.payload) > max_rtp_payload
+                    or len(frames) == 16
+                ):
                     # Need to flush what has been accumulated so far
 
                     # Emit a packet
-                    sbc_payload = bytes([len(frames)]) + b''.join([frame.payload for frame in frames])
-                    packet = MediaPacket(2, 0, 0, 0, sequence_number, timestamp, 0, [], 96, sbc_payload)
+                    sbc_payload = bytes([len(frames)]) + b''.join(
+                        [frame.payload for frame in frames]
+                    )
+                    packet = MediaPacket(
+                        2, 0, 0, 0, sequence_number, timestamp, 0, [], 96, sbc_payload
+                    )
                     packet.timestamp_seconds = timestamp / frame.sampling_frequency
                     yield packet
 
                     # Prepare for next packets
                     sequence_number += 1
-                    timestamp += sum([frame.sample_count for frame in frames])
+                    timestamp += sum((frame.sample_count for frame in frames))
                     frames = [frame]
                     frames_size = len(frame.payload)
                 else:

bumble/att.py

@@ -22,15 +22,22 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
+import struct
 from colors import color
 from pyee import EventEmitter
+from typing import Dict, Type
+
+from bumble.core import UUID, name_or_number
+from bumble.hci import HCI_Object, key_with_value
 
-from .core import *
-from .hci import *
 
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
+# pylint: disable=line-too-long
+
 ATT_CID = 0x04
 
 ATT_ERROR_RESPONSE              = 0x01
@@ -163,19 +170,14 @@ ATT_ERROR_NAMES = {
 ATT_DEFAULT_MTU = 23
 
 HANDLE_FIELD_SPEC    = {'size': 2, 'mapper': lambda x: f'0x{x:04X}'}
-UUID_2_16_FIELD_SPEC = lambda x, y: UUID.parse_uuid(x, y)    # noqa: E731
+# pylint: disable-next=unnecessary-lambda-assignment,unnecessary-lambda
+UUID_2_16_FIELD_SPEC = lambda x, y: UUID.parse_uuid(x, y)
+# pylint: disable-next=unnecessary-lambda-assignment,unnecessary-lambda
 UUID_2_FIELD_SPEC    = lambda x, y: UUID.parse_uuid_2(x, y)  # noqa: E731
 
-
-# -----------------------------------------------------------------------------
-# Utils
-# -----------------------------------------------------------------------------
-def key_with_value(dictionary, target_value):
-    for key, value in dictionary.items():
-        if value == target_value:
-            return key
-    return None
-
+# fmt: on
+# pylint: enable=line-too-long
+# pylint: disable=invalid-name
 
 # -----------------------------------------------------------------------------
 # Exceptions
@@ -196,8 +198,10 @@ class ATT_PDU:
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.3 ATTRIBUTE PDU
     '''
-    pdu_classes = {}
+
+    pdu_classes: Dict[int, Type[ATT_PDU]] = {}
     op_code = 0
+    name = None
 
     @staticmethod
     def from_bytes(pdu):
@@ -274,11 +278,13 @@ class ATT_PDU:
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('request_opcode_in_error', {'size': 1, 'mapper': ATT_PDU.pdu_name}),
         ('attribute_handle_in_error', HANDLE_FIELD_SPEC),
-    ('error_code',                {'size': 1, 'mapper': ATT_PDU.error_name})
-])
+        ('error_code', {'size': 1, 'mapper': ATT_PDU.error_name}),
+    ]
+)
 class ATT_Error_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.1.1 Error Response
@@ -286,9 +292,7 @@ class ATT_Error_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('client_rx_mtu', 2)
-])
+@ATT_PDU.subclass([('client_rx_mtu', 2)])
 class ATT_Exchange_MTU_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.2.1 Exchange MTU Request
@@ -296,9 +300,7 @@ class ATT_Exchange_MTU_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('server_rx_mtu', 2)
-])
+@ATT_PDU.subclass([('server_rx_mtu', 2)])
 class ATT_Exchange_MTU_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.2.2 Exchange MTU Response
@@ -306,10 +308,9 @@ class ATT_Exchange_MTU_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('starting_handle', HANDLE_FIELD_SPEC),
-    ('ending_handle',   HANDLE_FIELD_SPEC)
-])
+@ATT_PDU.subclass(
+    [('starting_handle', HANDLE_FIELD_SPEC), ('ending_handle', HANDLE_FIELD_SPEC)]
+)
 class ATT_Find_Information_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.3.1 Find Information Request
@@ -317,10 +318,7 @@ class ATT_Find_Information_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('format',           1),
-    ('information_data', '*')
-])
+@ATT_PDU.subclass([('format', 1), ('information_data', '*')])
 class ATT_Find_Information_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.3.2 Find Information Response
@@ -346,20 +344,33 @@ class ATT_Find_Information_Response(ATT_PDU):
 
     def __str__(self):
         result = color(self.name, 'yellow')
-        result += ':\n' + HCI_Object.format_fields(self.__dict__, [
+        result += ':\n' + HCI_Object.format_fields(
+            self.__dict__,
+            [
                 ('format', 1),
-            ('information', {'mapper': lambda x: ', '.join([f'0x{handle:04X}:{uuid.hex()}' for handle, uuid in x])})
-        ], '  ')
+                (
+                    'information',
+                    {
+                        'mapper': lambda x: ', '.join(
+                            [f'0x{handle:04X}:{uuid.hex()}' for handle, uuid in x]
+                        )
+                    },
+                ),
+            ],
+            '  ',
+        )
         return result
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('starting_handle', HANDLE_FIELD_SPEC),
         ('ending_handle', HANDLE_FIELD_SPEC),
         ('attribute_type', UUID_2_FIELD_SPEC),
-    ('attribute_value', '*')
-])
+        ('attribute_value', '*'),
+    ]
+)
 class ATT_Find_By_Type_Value_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.3.3 Find By Type Value Request
@@ -367,9 +378,7 @@ class ATT_Find_By_Type_Value_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('handles_information_list', '*')
-])
+@ATT_PDU.subclass([('handles_information_list', '*')])
 class ATT_Find_By_Type_Value_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.3.4 Find By Type Value Response
@@ -379,7 +388,9 @@ class ATT_Find_By_Type_Value_Response(ATT_PDU):
         self.handles_information = []
         offset = 0
         while offset + 4 <= len(self.handles_information_list):
-            found_attribute_handle, group_end_handle = struct.unpack_from('<HH', self.handles_information_list, offset)
+            found_attribute_handle, group_end_handle = struct.unpack_from(
+                '<HH', self.handles_information_list, offset
+            )
             self.handles_information.append((found_attribute_handle, group_end_handle))
             offset += 4
 
@@ -393,18 +404,34 @@ class ATT_Find_By_Type_Value_Response(ATT_PDU):
 
     def __str__(self):
         result = color(self.name, 'yellow')
-        result += ':\n' + HCI_Object.format_fields(self.__dict__, [
-            ('handles_information', {'mapper': lambda x: ', '.join([f'0x{handle1:04X}-0x{handle2:04X}' for handle1, handle2 in x])})
-        ], '  ')
+        result += ':\n' + HCI_Object.format_fields(
+            self.__dict__,
+            [
+                (
+                    'handles_information',
+                    {
+                        'mapper': lambda x: ', '.join(
+                            [
+                                f'0x{handle1:04X}-0x{handle2:04X}'
+                                for handle1, handle2 in x
+                            ]
+                        )
+                    },
+                )
+            ],
+            '  ',
+        )
         return result
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('starting_handle', HANDLE_FIELD_SPEC),
         ('ending_handle', HANDLE_FIELD_SPEC),
-    ('attribute_type',  UUID_2_16_FIELD_SPEC)
-])
+        ('attribute_type', UUID_2_16_FIELD_SPEC),
+    ]
+)
 class ATT_Read_By_Type_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.1 Read By Type Request
@@ -412,10 +439,7 @@ class ATT_Read_By_Type_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('length',              1),
-    ('attribute_data_list', '*')
-])
+@ATT_PDU.subclass([('length', 1), ('attribute_data_list', '*')])
 class ATT_Read_By_Type_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.2 Read By Type Response
@@ -424,9 +448,15 @@ class ATT_Read_By_Type_Response(ATT_PDU):
     def parse_attribute_data_list(self):
         self.attributes = []
         offset = 0
-        while self.length != 0 and offset + self.length <= len(self.attribute_data_list):
-            attribute_handle, = struct.unpack_from('<H', self.attribute_data_list, offset)
-            attribute_value = self.attribute_data_list[offset + 2:offset + self.length]
+        while self.length != 0 and offset + self.length <= len(
+            self.attribute_data_list
+        ):
+            (attribute_handle,) = struct.unpack_from(
+                '<H', self.attribute_data_list, offset
+            )
+            attribute_value = self.attribute_data_list[
+                offset + 2 : offset + self.length
+            ]
             self.attributes.append((attribute_handle, attribute_value))
             offset += self.length
 
@@ -440,17 +470,26 @@ class ATT_Read_By_Type_Response(ATT_PDU):
 
     def __str__(self):
         result = color(self.name, 'yellow')
-        result += ':\n' + HCI_Object.format_fields(self.__dict__, [
+        result += ':\n' + HCI_Object.format_fields(
+            self.__dict__,
+            [
                 ('length', 1),
-            ('attributes', {'mapper': lambda x: ', '.join([f'0x{handle:04X}:{value.hex()}' for handle, value in x])})
-        ], '  ')
+                (
+                    'attributes',
+                    {
+                        'mapper': lambda x: ', '.join(
+                            [f'0x{handle:04X}:{value.hex()}' for handle, value in x]
+                        )
+                    },
+                ),
+            ],
+            '  ',
+        )
         return result
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_handle', HANDLE_FIELD_SPEC)
-])
+@ATT_PDU.subclass([('attribute_handle', HANDLE_FIELD_SPEC)])
 class ATT_Read_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.3 Read Request
@@ -458,9 +497,7 @@ class ATT_Read_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_value', '*')
-])
+@ATT_PDU.subclass([('attribute_value', '*')])
 class ATT_Read_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.4 Read Response
@@ -468,10 +505,7 @@ class ATT_Read_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_handle', HANDLE_FIELD_SPEC),
-    ('value_offset',     2)
-])
+@ATT_PDU.subclass([('attribute_handle', HANDLE_FIELD_SPEC), ('value_offset', 2)])
 class ATT_Read_Blob_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.5 Read Blob Request
@@ -479,9 +513,7 @@ class ATT_Read_Blob_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('part_attribute_value', '*')
-])
+@ATT_PDU.subclass([('part_attribute_value', '*')])
 class ATT_Read_Blob_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.6 Read Blob Response
@@ -489,9 +521,7 @@ class ATT_Read_Blob_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('set_of_handles', '*')
-])
+@ATT_PDU.subclass([('set_of_handles', '*')])
 class ATT_Read_Multiple_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.7 Read Multiple Request
@@ -499,9 +529,7 @@ class ATT_Read_Multiple_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('set_of_values', '*')
-])
+@ATT_PDU.subclass([('set_of_values', '*')])
 class ATT_Read_Multiple_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.8 Read Multiple Response
@@ -509,11 +537,13 @@ class ATT_Read_Multiple_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('starting_handle', HANDLE_FIELD_SPEC),
         ('ending_handle', HANDLE_FIELD_SPEC),
-    ('attribute_group_type', UUID_2_16_FIELD_SPEC)
-])
+        ('attribute_group_type', UUID_2_16_FIELD_SPEC),
+    ]
+)
 class ATT_Read_By_Group_Type_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.9 Read by Group Type Request
@@ -521,10 +551,7 @@ class ATT_Read_By_Group_Type_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('length',              1),
-    ('attribute_data_list', '*')
-])
+@ATT_PDU.subclass([('length', 1), ('attribute_data_list', '*')])
 class ATT_Read_By_Group_Type_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.4.10 Read by Group Type Response
@@ -533,10 +560,18 @@ class ATT_Read_By_Group_Type_Response(ATT_PDU):
     def parse_attribute_data_list(self):
         self.attributes = []
         offset = 0
-        while self.length != 0 and offset + self.length <= len(self.attribute_data_list):
-            attribute_handle, end_group_handle = struct.unpack_from('<HH', self.attribute_data_list, offset)
-            attribute_value = self.attribute_data_list[offset + 4:offset + self.length]
-            self.attributes.append((attribute_handle, end_group_handle, attribute_value))
+        while self.length != 0 and offset + self.length <= len(
+            self.attribute_data_list
+        ):
+            attribute_handle, end_group_handle = struct.unpack_from(
+                '<HH', self.attribute_data_list, offset
+            )
+            attribute_value = self.attribute_data_list[
+                offset + 4 : offset + self.length
+            ]
+            self.attributes.append(
+                (attribute_handle, end_group_handle, attribute_value)
+            )
             offset += self.length
 
     def __init__(self, *args, **kwargs):
@@ -549,18 +584,29 @@ class ATT_Read_By_Group_Type_Response(ATT_PDU):
 
     def __str__(self):
         result = color(self.name, 'yellow')
-        result += ':\n' + HCI_Object.format_fields(self.__dict__, [
+        result += ':\n' + HCI_Object.format_fields(
+            self.__dict__,
+            [
                 ('length', 1),
-            ('attributes', {'mapper': lambda x: ', '.join([f'0x{handle:04X}-0x{end:04X}:{value.hex()}' for handle, end, value in x])})
-        ], '  ')
+                (
+                    'attributes',
+                    {
+                        'mapper': lambda x: ', '.join(
+                            [
+                                f'0x{handle:04X}-0x{end:04X}:{value.hex()}'
+                                for handle, end, value in x
+                            ]
+                        )
+                    },
+                ),
+            ],
+            '  ',
+        )
         return result
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_handle', HANDLE_FIELD_SPEC),
-    ('attribute_value',  '*')
-])
+@ATT_PDU.subclass([('attribute_handle', HANDLE_FIELD_SPEC), ('attribute_value', '*')])
 class ATT_Write_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.5.1 Write Request
@@ -576,10 +622,7 @@ class ATT_Write_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_handle', HANDLE_FIELD_SPEC),
-    ('attribute_value',  '*')
-])
+@ATT_PDU.subclass([('attribute_handle', HANDLE_FIELD_SPEC), ('attribute_value', '*')])
 class ATT_Write_Command(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.5.3 Write Command
@@ -587,11 +630,13 @@ class ATT_Write_Command(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('attribute_handle', HANDLE_FIELD_SPEC),
         ('attribute_value', '*')
         # ('authentication_signature', 'TODO')
-])
+    ]
+)
 class ATT_Signed_Write_Command(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.5.4 Signed Write Command
@@ -599,11 +644,13 @@ class ATT_Signed_Write_Command(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('attribute_handle', HANDLE_FIELD_SPEC),
         ('value_offset', 2),
-    ('part_attribute_value', '*')
-])
+        ('part_attribute_value', '*'),
+    ]
+)
 class ATT_Prepare_Write_Request(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.6.1 Prepare Write Request
@@ -611,11 +658,13 @@ class ATT_Prepare_Write_Request(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
+@ATT_PDU.subclass(
+    [
         ('attribute_handle', HANDLE_FIELD_SPEC),
         ('value_offset', 2),
-    ('part_attribute_value', '*')
-])
+        ('part_attribute_value', '*'),
+    ]
+)
 class ATT_Prepare_Write_Response(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.6.2 Prepare Write Response
@@ -639,10 +688,7 @@ class ATT_Execute_Write_Response(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_handle', HANDLE_FIELD_SPEC),
-    ('attribute_value',  '*')
-])
+@ATT_PDU.subclass([('attribute_handle', HANDLE_FIELD_SPEC), ('attribute_value', '*')])
 class ATT_Handle_Value_Notification(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.7.1 Handle Value Notification
@@ -650,10 +696,7 @@ class ATT_Handle_Value_Notification(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-@ATT_PDU.subclass([
-    ('attribute_handle', HANDLE_FIELD_SPEC),
-    ('attribute_value',  '*')
-])
+@ATT_PDU.subclass([('attribute_handle', HANDLE_FIELD_SPEC), ('attribute_value', '*')])
 class ATT_Handle_Value_Indication(ATT_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part F - 3.4.7.2 Handle Value Indication
@@ -687,15 +730,15 @@ class Attribute(EventEmitter):
         self.permissions = permissions
 
         # Convert the type to a UUID object if it isn't already
-        if type(attribute_type) is str:
+        if isinstance(attribute_type, str):
             self.type = UUID(attribute_type)
-        elif type(attribute_type) is bytes:
+        elif isinstance(attribute_type, bytes):
             self.type = UUID.from_bytes(attribute_type)
         else:
             self.type = attribute_type
 
         # Convert the value to a byte array
-        if type(value) is str:
+        if isinstance(value, str):
             self.value = bytes(value, 'utf-8')
         else:
             self.value = value
@@ -709,9 +752,11 @@ class Attribute(EventEmitter):
     def read_value(self, connection):
         if read := getattr(self.value, 'read', None):
             try:
-                value = read(connection)
+                value = read(connection)  # pylint: disable=not-callable
             except ATT_Error as error:
-                raise ATT_Error(error_code=error.error_code, att_handle=self.handle)
+                raise ATT_Error(
+                    error_code=error.error_code, att_handle=self.handle
+                ) from error
         else:
             value = self.value
 
@@ -722,16 +767,18 @@ class Attribute(EventEmitter):
 
         if write := getattr(self.value, 'write', None):
             try:
-                write(connection, value)
+                write(connection, value)  # pylint: disable=not-callable
             except ATT_Error as error:
-                raise ATT_Error(error_code=error.error_code, att_handle=self.handle)
+                raise ATT_Error(
+                    error_code=error.error_code, att_handle=self.handle
+                ) from error
         else:
             self.value = value
 
         self.emit('write', connection, value)
 
     def __repr__(self):
-        if type(self.value) is bytes:
+        if isinstance(self.value, bytes):
             value_str = self.value.hex()
         else:
             value_str = str(self.value)
@@ -739,4 +786,8 @@ class Attribute(EventEmitter):
             value_string = f', value={self.value.hex()}'
         else:
             value_string = ''
-        return f'Attribute(handle=0x{self.handle:04X}, type={self.type}, permissions={self.permissions}{value_string})'
+        return (
+            f'Attribute(handle=0x{self.handle:04X}, '
+            f'type={self.type}, '
+            f'permissions={self.permissions}{value_string})'
+        )

bumble/bridge.py

@@ -62,14 +62,14 @@ class HCI_Bridge:
         hci_controller_source,
         hci_controller_sink,
         host_to_controller_filter=None,
-        controller_to_host_filter = None
+        controller_to_host_filter=None,
     ):
         tracer = PacketTracer(emit_message=logger.info)
         host_to_controller_forwarder = HCI_Bridge.Forwarder(
             hci_controller_sink,
             hci_host_sink,
             host_to_controller_filter,
-            lambda packet: tracer.trace(packet, 0)
+            lambda packet: tracer.trace(packet, 0),
         )
         hci_host_source.set_packet_sink(host_to_controller_forwarder)
 
@@ -77,6 +77,6 @@ class HCI_Bridge:
             hci_host_sink,
             hci_controller_sink,
             controller_to_host_filter,
-            lambda packet: tracer.trace(packet, 1)
+            lambda packet: tracer.trace(packet, 1),
         )
         hci_controller_source.set_packet_sink(controller_to_host_forwarder)

bumble/company_ids.py

@@ -17,6 +17,7 @@
 #  the `generate_company_id_list.py` script
 # -----------------------------------------------------------------------------
 
+# pylint: disable=line-too-long
 COMPANY_IDENTIFIERS = {
     0x0000: "Ericsson Technology Licensing",
     0x0001: "Nokia Mobile Phones",
@@ -196,28 +197,28 @@ COMPANY_IDENTIFIERS = {
     0x00AF: "Cinetix",
     0x00B0: "Passif Semiconductor Corp",
     0x00B1: "Saris Cycling Group, Inc",
-    0x00B2: "​Bekey A/S",
-    0x00B3: "​Clarinox Technologies Pty. Ltd.",
-    0x00B4: "​BDE Technology Co., Ltd.",
+    0x00B2: "Bekey A/S",
+    0x00B3: "Clarinox Technologies Pty. Ltd.",
+    0x00B4: "BDE Technology Co., Ltd.",
     0x00B5: "Swirl Networks",
-    0x00B6: "​Meso international",
-    0x00B7: "​TreLab Ltd",
-    0x00B8: "​Qualcomm Innovation Center, Inc. (QuIC)",
-    0x00B9: "​​Johnson Controls, Inc.",
-    0x00BA: "​Starkey Laboratories Inc.",
-    0x00BB: "​​S-Power Electronics Limited",
-    0x00BC: "​​Ace Sensor Inc",
-    0x00BD: "​​Aplix Corporation",
-    0x00BE: "​​AAMP of America",
-    0x00BF: "​​Stalmart Technology Limited",
-    0x00C0: "​​AMICCOM Electronics Corporation",
-    0x00C1: "​​Shenzhen Excelsecu Data Technology Co.,Ltd",
-    0x00C2: "​​Geneq Inc.",
-    0x00C3: "​​adidas AG",
-    0x00C4: "​​LG Electronics​",
-    0x00C5: "​Onset Computer Corporation",
-    0x00C6: "​Selfly BV",
-    0x00C7: "​Quuppa Oy.",
+    0x00B6: "Meso international",
+    0x00B7: "TreLab Ltd",
+    0x00B8: "Qualcomm Innovation Center, Inc. (QuIC)",
+    0x00B9: "Johnson Controls, Inc.",
+    0x00BA: "Starkey Laboratories Inc.",
+    0x00BB: "S-Power Electronics Limited",
+    0x00BC: "Ace Sensor Inc",
+    0x00BD: "Aplix Corporation",
+    0x00BE: "AAMP of America",
+    0x00BF: "Stalmart Technology Limited",
+    0x00C0: "AMICCOM Electronics Corporation",
+    0x00C1: "Shenzhen Excelsecu Data Technology Co.,Ltd",
+    0x00C2: "Geneq Inc.",
+    0x00C3: "adidas AG",
+    0x00C4: "LG Electronics",
+    0x00C5: "Onset Computer Corporation",
+    0x00C6: "Selfly BV",
+    0x00C7: "Quuppa Oy.",
     0x00C8: "GeLo Inc",
     0x00C9: "Evluma",
     0x00CA: "MC10",
@@ -249,10 +250,10 @@ COMPANY_IDENTIFIERS = {
     0x00E4: "Laird Connectivity, Inc. formerly L.S. Research Inc.",
     0x00E5: "Eden Software Consultants Ltd.",
     0x00E6: "Freshtemp",
-    0x00E7: "​KS Technologies",
-    0x00E8: "​ACTS Technologies",
-    0x00E9: "​Vtrack Systems",
-    0x00EA: "​Nielsen-Kellerman Company",
+    0x00E7: "KS Technologies",
+    0x00E8: "ACTS Technologies",
+    0x00E9: "Vtrack Systems",
+    0x00EA: "Nielsen-Kellerman Company",
     0x00EB: "Server Technology Inc.",
     0x00EC: "BioResearch Associates",
     0x00ED: "Jolly Logic, LLC",
@@ -2704,5 +2705,5 @@ COMPANY_IDENTIFIERS = {
     0x0A7C: "WAFERLOCK",
     0x0A7D: "Freedman Electronics Pty Ltd",
     0x0A7E: "Keba AG",
-    0x0A7F: "Intuity Medical"
+    0x0A7F: "Intuity Medical",
 }

bumble/controller.py

@@ -19,9 +19,36 @@ import logging
 import asyncio
 import itertools
 import random
+import struct
+from colors import color
+from bumble.core import BT_CENTRAL_ROLE, BT_PERIPHERAL_ROLE
+
+from bumble.hci import (
+    HCI_ACL_DATA_PACKET,
+    HCI_COMMAND_DISALLOWED_ERROR,
+    HCI_COMMAND_PACKET,
+    HCI_COMMAND_STATUS_PENDING,
+    HCI_CONNECTION_TIMEOUT_ERROR,
+    HCI_EVENT_PACKET,
+    HCI_INVALID_HCI_COMMAND_PARAMETERS_ERROR,
+    HCI_LE_1M_PHY,
+    HCI_SUCCESS,
+    HCI_UNKNOWN_HCI_COMMAND_ERROR,
+    HCI_VERSION_BLUETOOTH_CORE_5_0,
+    Address,
+    HCI_AclDataPacket,
+    HCI_AclDataPacketAssembler,
+    HCI_Command_Complete_Event,
+    HCI_Command_Status_Event,
+    HCI_Disconnection_Complete_Event,
+    HCI_Encryption_Change_Event,
+    HCI_LE_Advertising_Report_Event,
+    HCI_LE_Connection_Complete_Event,
+    HCI_LE_Read_Remote_Features_Complete_Event,
+    HCI_Number_Of_Completed_Packets_Event,
+    HCI_Packet,
+)
 
-from .hci import *
-from .l2cap import *
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -48,11 +75,15 @@ class Connection:
 
     def on_hci_acl_data_packet(self, packet):
         self.assembler.feed_packet(packet)
-        self.controller.send_hci_packet(HCI_Number_Of_Completed_Packets_Event([(self.handle, 1)]))
+        self.controller.send_hci_packet(
+            HCI_Number_Of_Completed_Packets_Event([(self.handle, 1)])
+        )
 
     def on_acl_pdu(self, data):
         if self.link:
-            self.link.send_acl_data(self.controller.random_address, self.peer_address, data)
+            self.link.send_acl_data(
+                self.controller.random_address, self.peer_address, data
+            )
 
 
 # -----------------------------------------------------------------------------
@@ -62,22 +93,36 @@ class Controller:
         self.hci_sink = None
         self.link = link
 
-        self.central_connections    = {}  # Connections where this controller is the central
-        self.peripheral_connections = {}  # Connections where this controller is the peripheral
+        self.central_connections = (
+            {}
+        )  # Connections where this controller is the central
+        self.peripheral_connections = (
+            {}
+        )  # Connections where this controller is the peripheral
 
         self.hci_version = HCI_VERSION_BLUETOOTH_CORE_5_0
         self.hci_revision = 0
         self.lmp_version = HCI_VERSION_BLUETOOTH_CORE_5_0
         self.lmp_subversion = 0
-        self.lmp_features                 = bytes.fromhex('0000000060000000')  # BR/EDR Not Supported, LE Supported (Controller)
+        self.lmp_features = bytes.fromhex(
+            '0000000060000000'
+        )  # BR/EDR Not Supported, LE Supported (Controller)
         self.manufacturer_name = 0xFFFF
         self.hc_le_data_packet_length = 27
         self.hc_total_num_le_data_packets = 64
-        self.supported_commands           = bytes.fromhex('2000800000c000000000e40000002822000000000000040000f7ffff7f00000030f0f9ff01008004000000000000000000000000000000000000000000000000')
+        self.event_mask = 0
+        self.event_mask_page_2 = 0
+        self.supported_commands = bytes.fromhex(
+            '2000800000c000000000e40000002822000000000000040000f7ffff7f000000'
+            '30f0f9ff01008004000000000000000000000000000000000000000000000000'
+        )
+        self.le_event_mask = 0
+        self.advertising_parameters = None
         self.le_features = bytes.fromhex('ff49010000000000')
         self.le_states = bytes.fromhex('ffff3fffff030000')
         self.advertising_channel_tx_power = 0
         self.filter_accept_list_size = 8
+        self.filter_duplicates = False
         self.resolving_list_size = 8
         self.supported_max_tx_octets = 27
         self.supported_max_tx_time = 10000  # microseconds
@@ -121,7 +166,8 @@ class Controller:
     @host.setter
     def host(self, host):
         '''
-        Sets the host (sink) for this controller, and set this controller as the controller (sink) for the host
+        Sets the host (sink) for this controller, and set this controller as the
+        controller (sink) for the host
         '''
         self.set_packet_sink(host)
         if host:
@@ -139,7 +185,7 @@ class Controller:
 
     @public_address.setter
     def public_address(self, address):
-        if type(address) is str:
+        if isinstance(address, str):
             address = Address(address)
         self._public_address = address
 
@@ -149,7 +195,7 @@ class Controller:
 
     @random_address.setter
     def random_address(self, address):
-        if type(address) is str:
+        if isinstance(address, str):
             address = Address(address)
         self._random_address = address
         logger.debug(f'new random address: {address}')
@@ -162,7 +208,10 @@ class Controller:
         self.on_hci_packet(HCI_Packet.from_bytes(packet))
 
     def on_hci_packet(self, packet):
-        logger.debug(f'{color("<<<", "blue")} [{self.name}] {color("HOST -> CONTROLLER", "blue")}: {packet}')
+        logger.debug(
+            f'{color("<<<", "blue")} [{self.name}] '
+            f'{color("HOST -> CONTROLLER", "blue")}: {packet}'
+        )
 
         # If the packet is a command, invoke the handler for this packet
         if packet.hci_packet_type == HCI_COMMAND_PACKET:
@@ -178,28 +227,35 @@ class Controller:
         handler_name = f'on_{command.name.lower()}'
         handler = getattr(self, handler_name, self.on_hci_command)
         result = handler(command)
-        if type(result) is bytes:
-            self.send_hci_packet(HCI_Command_Complete_Event(
+        if isinstance(result, bytes):
+            self.send_hci_packet(
+                HCI_Command_Complete_Event(
                     num_hci_command_packets=1,
                     command_opcode=command.op_code,
-                return_parameters       = result
-            ))
+                    return_parameters=result,
+                )
+            )
 
-    def on_hci_event_packet(self, event):
+    def on_hci_event_packet(self, _event):
         logger.warning('!!! unexpected event packet')
 
     def on_hci_acl_data_packet(self, packet):
         # Look for the connection to which this data belongs
         connection = self.find_connection_by_handle(packet.connection_handle)
         if connection is None:
-            logger.warning(f'!!! no connection for handle 0x{packet.connection_handle:04X}')
+            logger.warning(
+                f'!!! no connection for handle 0x{packet.connection_handle:04X}'
+            )
             return
 
         # Pass the packet to the connection
         connection.on_hci_acl_data_packet(packet)
 
     def send_hci_packet(self, packet):
-        logger.debug(f'{color(">>>", "green")} [{self.name}] {color("CONTROLLER -> HOST", "green")}: {packet}')
+        logger.debug(
+            f'{color(">>>", "green")} [{self.name}] '
+            f'{color("CONTROLLER -> HOST", "green")}: {packet}'
+        )
         if self.host:
             self.host.on_packet(packet.to_bytes())
 
@@ -215,8 +271,7 @@ class Controller:
         handle = 0
         max_handle = 0
         for connection in itertools.chain(
-            self.central_connections.values(),
-            self.peripheral_connections.values()
+            self.central_connections.values(), self.peripheral_connections.values()
         ):
             max_handle = max(max_handle, connection.handle)
             if connection.handle == handle:
@@ -225,12 +280,13 @@ class Controller:
         return handle
 
     def find_connection_by_address(self, address):
-        return self.central_connections.get(address) or self.peripheral_connections.get(address)
+        return self.central_connections.get(address) or self.peripheral_connections.get(
+            address
+        )
 
     def find_connection_by_handle(self, handle):
         for connection in itertools.chain(
-            self.central_connections.values(),
-            self.peripheral_connections.values()
+            self.central_connections.values(), self.peripheral_connections.values()
         ):
             if connection.handle == handle:
                 return connection
@@ -253,12 +309,15 @@ class Controller:
         connection = self.peripheral_connections.get(peer_address)
         if connection is None:
             connection_handle = self.allocate_connection_handle()
-            connection = Connection(self, connection_handle, BT_PERIPHERAL_ROLE, peer_address, self.link)
+            connection = Connection(
+                self, connection_handle, BT_PERIPHERAL_ROLE, peer_address, self.link
+            )
             self.peripheral_connections[peer_address] = connection
             logger.debug(f'New PERIPHERAL connection handle: 0x{connection_handle:04X}')
 
         # Then say that the connection has completed
-        self.send_hci_packet(HCI_LE_Connection_Complete_Event(
+        self.send_hci_packet(
+            HCI_LE_Connection_Complete_Event(
                 status=HCI_SUCCESS,
                 connection_handle=connection.handle,
                 role=connection.role,
@@ -267,8 +326,9 @@ class Controller:
                 connection_interval=10,  # FIXME
                 peripheral_latency=0,  # FIXME
                 supervision_timeout=10,  # FIXME
-            central_clock_accuracy = 7    # FIXME
-        ))
+                central_clock_accuracy=7,  # FIXME
+            )
+        )
 
     def on_link_central_disconnected(self, peer_address, reason):
         '''
@@ -277,18 +337,22 @@ class Controller:
 
         # Send a disconnection complete event
         if connection := self.peripheral_connections.get(peer_address):
-            self.send_hci_packet(HCI_Disconnection_Complete_Event(
+            self.send_hci_packet(
+                HCI_Disconnection_Complete_Event(
                     status=HCI_SUCCESS,
                     connection_handle=connection.handle,
-                reason            = reason
-            ))
+                    reason=reason,
+                )
+            )
 
             # Remove the connection
             del self.peripheral_connections[peer_address]
         else:
-            logger.warn(f'!!! No peripheral connection found for {peer_address}')
+            logger.warning(f'!!! No peripheral connection found for {peer_address}')
 
-    def on_link_peripheral_connection_complete(self, le_create_connection_command, status):
+    def on_link_peripheral_connection_complete(
+        self, le_create_connection_command, status
+    ):
         '''
         Called by the link when a connection has been made or has failed to be made
         '''
@@ -300,19 +364,19 @@ class Controller:
             if connection is None:
                 connection_handle = self.allocate_connection_handle()
                 connection = Connection(
-                    self,
-                    connection_handle,
-                    BT_CENTRAL_ROLE,
-                    peer_address,
-                    self.link
+                    self, connection_handle, BT_CENTRAL_ROLE, peer_address, self.link
                 )
                 self.central_connections[peer_address] = connection
-                logger.debug(f'New CENTRAL connection handle: 0x{connection_handle:04X}')
+                logger.debug(
+                    f'New CENTRAL connection handle: 0x{connection_handle:04X}'
+                )
         else:
             connection = None
 
         # Say that the connection has completed
-        self.send_hci_packet(HCI_LE_Connection_Complete_Event(
+        self.send_hci_packet(
+            # pylint: disable=line-too-long
+            HCI_LE_Connection_Complete_Event(
                 status=status,
                 connection_handle=connection.handle if connection else 0,
                 role=BT_CENTRAL_ROLE,
@@ -321,8 +385,9 @@ class Controller:
                 connection_interval=le_create_connection_command.connection_interval_min,
                 peripheral_latency=le_create_connection_command.max_latency,
                 supervision_timeout=le_create_connection_command.supervision_timeout,
-            central_clock_accuracy = 0
-        ))
+                central_clock_accuracy=0,
+            )
+        )
 
     def on_link_peripheral_disconnection_complete(self, disconnection_command, status):
         '''
@@ -330,14 +395,18 @@ class Controller:
         '''
 
         # Send a disconnection complete event
-        self.send_hci_packet(HCI_Disconnection_Complete_Event(
+        self.send_hci_packet(
+            HCI_Disconnection_Complete_Event(
                 status=status,
                 connection_handle=disconnection_command.connection_handle,
-            reason            = disconnection_command.reason
-        ))
+                reason=disconnection_command.reason,
+            )
+        )
 
         # Remove the connection
-        if connection := self.find_central_connection_by_handle(disconnection_command.connection_handle):
+        if connection := self.find_central_connection_by_handle(
+            disconnection_command.connection_handle
+        ):
             logger.debug(f'CENTRAL Connection removed: {connection}')
             del self.central_connections[connection.peer_address]
 
@@ -348,25 +417,25 @@ class Controller:
 
         # Send a disconnection complete event
         if connection := self.central_connections.get(peer_address):
-            self.send_hci_packet(HCI_Disconnection_Complete_Event(
+            self.send_hci_packet(
+                HCI_Disconnection_Complete_Event(
                     status=HCI_SUCCESS,
                     connection_handle=connection.handle,
-                reason            = HCI_CONNECTION_TIMEOUT_ERROR
-            ))
+                    reason=HCI_CONNECTION_TIMEOUT_ERROR,
+                )
+            )
 
             # Remove the connection
             del self.central_connections[peer_address]
         else:
-            logger.warn(f'!!! No central connection found for {peer_address}')
+            logger.warning(f'!!! No central connection found for {peer_address}')
 
-    def on_link_encrypted(self, peer_address, rand, ediv, ltk):
+    def on_link_encrypted(self, peer_address, _rand, _ediv, _ltk):
         # For now, just setup the encryption without asking the host
         if connection := self.find_connection_by_address(peer_address):
             self.send_hci_packet(
                 HCI_Encryption_Change_Event(
-                    status             = 0,
-                    connection_handle  = connection.handle,
-                    encryption_enabled = 1
+                    status=0, connection_handle=connection.handle, encryption_enabled=1
                 )
             )
 
@@ -388,24 +457,24 @@ class Controller:
             return
 
         # Send a scan report
-        report = HCI_Object(
-            HCI_LE_Advertising_Report_Event.REPORT_FIELDS,
+        report = HCI_LE_Advertising_Report_Event.Report(
+            HCI_LE_Advertising_Report_Event.Report.FIELDS,
             event_type=HCI_LE_Advertising_Report_Event.ADV_IND,
             address_type=sender_address.address_type,
             address=sender_address,
             data=data,
-            rssi         = -50
+            rssi=-50,
         )
         self.send_hci_packet(HCI_LE_Advertising_Report_Event([report]))
 
         # Simulate a scan response
-        report = HCI_Object(
-            HCI_LE_Advertising_Report_Event.REPORT_FIELDS,
+        report = HCI_LE_Advertising_Report_Event.Report(
+            HCI_LE_Advertising_Report_Event.Report.FIELDS,
             event_type=HCI_LE_Advertising_Report_Event.SCAN_RSP,
             address_type=sender_address.address_type,
             address=sender_address,
             data=data,
-            rssi         = -50
+            rssi=-50,
         )
         self.send_hci_packet(HCI_LE_Advertising_Report_Event([report]))
 
@@ -414,14 +483,18 @@ class Controller:
     ############################################################
     def on_advertising_timer_fired(self):
         self.send_advertising_data()
-        self.advertising_timer_handle = asyncio.get_running_loop().call_later(self.advertising_interval / 1000.0, self.on_advertising_timer_fired)
+        self.advertising_timer_handle = asyncio.get_running_loop().call_later(
+            self.advertising_interval / 1000.0, self.on_advertising_timer_fired
+        )
 
     def start_advertising(self):
         # Stop any ongoing advertising before we start again
         self.stop_advertising()
 
         # Advertise now
-        self.advertising_timer_handle = asyncio.get_running_loop().call_soon(self.on_advertising_timer_fired)
+        self.advertising_timer_handle = asyncio.get_running_loop().call_soon(
+            self.on_advertising_timer_fired
+        )
 
     def stop_advertising(self):
         if self.advertising_timer_handle is not None:
@@ -455,15 +528,21 @@ class Controller:
         See Bluetooth spec Vol 2, Part E - 7.1.6 Disconnect Command
         '''
         # First, say that the disconnection is pending
-        self.send_hci_packet(HCI_Command_Status_Event(
+        self.send_hci_packet(
+            HCI_Command_Status_Event(
                 status=HCI_COMMAND_STATUS_PENDING,
                 num_hci_command_packets=1,
-            command_opcode          = command.op_code
-        ))
+                command_opcode=command.op_code,
+            )
+        )
 
         # Notify the link of the disconnection
-        if not (connection := self.find_central_connection_by_handle(command.connection_handle)):
-            logger.warn('connection not found')
+        if not (
+            connection := self.find_central_connection_by_handle(
+                command.connection_handle
+            )
+        ):
+            logger.warning('connection not found')
             return
 
         if self.link:
@@ -479,7 +558,7 @@ class Controller:
         self.event_mask = command.event_mask
         return bytes([HCI_SUCCESS])
 
-    def on_hci_reset_command(self, command):
+    def on_hci_reset_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.2 Reset Command
         '''
@@ -501,7 +580,7 @@ class Controller:
                 pass
         return bytes([HCI_SUCCESS])
 
-    def on_hci_read_local_name_command(self, command):
+    def on_hci_read_local_name_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.12 Read Local Name Command
         '''
@@ -511,21 +590,22 @@ class Controller:
 
         return bytes([HCI_SUCCESS]) + local_name
 
-    def on_hci_read_class_of_device_command(self, command):
+    def on_hci_read_class_of_device_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.25 Read Class of Device Command
         '''
         return bytes([HCI_SUCCESS, 0, 0, 0])
 
-    def on_hci_write_class_of_device_command(self, command):
+    def on_hci_write_class_of_device_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.26 Write Class of Device Command
         '''
         return bytes([HCI_SUCCESS])
 
-    def on_hci_read_synchronous_flow_control_enable_command(self, command):
+    def on_hci_read_synchronous_flow_control_enable_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.3.36 Read Synchronous Flow Control Enable Command
+        See Bluetooth spec Vol 2, Part E - 7.3.36 Read Synchronous Flow Control Enable
+        Command
         '''
         if self.sync_flow_control:
             ret = 1
@@ -535,7 +615,8 @@ class Controller:
 
     def on_hci_write_synchronous_flow_control_enable_command(self, command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.3.37 Write Synchronous Flow Control Enable Command
+        See Bluetooth spec Vol 2, Part E - 7.3.37 Write Synchronous Flow Control Enable
+        Command
         '''
         ret = HCI_SUCCESS
         if command.synchronous_flow_control_enable == 1:
@@ -546,7 +627,7 @@ class Controller:
             ret = HCI_INVALID_HCI_COMMAND_PARAMETERS_ERROR
         return bytes([ret])
 
-    def on_hci_write_simple_pairing_mode_command(self, command):
+    def on_hci_write_simple_pairing_mode_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.59 Write Simple Pairing Mode Command
         '''
@@ -559,13 +640,13 @@ class Controller:
         self.event_mask_page_2 = command.event_mask_page_2
         return bytes([HCI_SUCCESS])
 
-    def on_hci_read_le_host_support_command(self, command):
+    def on_hci_read_le_host_support_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.78 Write LE Host Support Command
         '''
         return bytes([HCI_SUCCESS, 1, 0])
 
-    def on_hci_write_le_host_support_command(self, command):
+    def on_hci_write_le_host_support_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.3.79 Write LE Host Support Command
         '''
@@ -574,12 +655,13 @@ class Controller:
 
     def on_hci_write_authenticated_payload_timeout_command(self, command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.3.94 Write Authenticated Payload Timeout Command
+        See Bluetooth spec Vol 2, Part E - 7.3.94 Write Authenticated Payload Timeout
+        Command
         '''
         # TODO
         return struct.pack('<BH', HCI_SUCCESS, command.connection_handle)
 
-    def on_hci_read_local_version_information_command(self, command):
+    def on_hci_read_local_version_information_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.4.1 Read Local Version Information Command
         '''
@@ -590,26 +672,30 @@ class Controller:
             self.hci_revision,
             self.lmp_version,
             self.manufacturer_name,
-            self.lmp_subversion
+            self.lmp_subversion,
         )
 
-    def on_hci_read_local_supported_commands_command(self, command):
+    def on_hci_read_local_supported_commands_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.4.2 Read Local Supported Commands Command
         '''
         return bytes([HCI_SUCCESS]) + self.supported_commands
 
-    def on_hci_read_local_supported_features_command(self, command):
+    def on_hci_read_local_supported_features_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.4.3 Read Local Supported Features Command
         '''
         return bytes([HCI_SUCCESS]) + self.lmp_features
 
-    def on_hci_read_bd_addr_command(self, command):
+    def on_hci_read_bd_addr_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.4.6 Read BD_ADDR Command
         '''
-        bd_addr = self._public_address.to_bytes() if self._public_address is not None else bytes(6)
+        bd_addr = (
+            self._public_address.to_bytes()
+            if self._public_address is not None
+            else bytes(6)
+        )
         return bytes([HCI_SUCCESS]) + bd_addr
 
     def on_hci_le_set_event_mask_command(self, command):
@@ -619,18 +705,21 @@ class Controller:
         self.le_event_mask = command.le_event_mask
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_read_buffer_size_command(self, command):
+    def on_hci_le_read_buffer_size_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.2 LE Read Buffer Size Command
         '''
-        return struct.pack('<BHB',
+        return struct.pack(
+            '<BHB',
             HCI_SUCCESS,
             self.hc_le_data_packet_length,
-                           self.hc_total_num_le_data_packets)
+            self.hc_total_num_le_data_packets,
+        )
 
-    def on_hci_le_read_local_supported_features_command(self, command):
+    def on_hci_le_read_local_supported_features_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.3 LE Read Local Supported Features Command
+        See Bluetooth spec Vol 2, Part E - 7.8.3 LE Read Local Supported Features
+        Command
         '''
         return bytes([HCI_SUCCESS]) + self.le_features
 
@@ -648,9 +737,10 @@ class Controller:
         self.advertising_parameters = command
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_read_advertising_channel_tx_power_command(self, command):
+    def on_hci_le_read_advertising_physical_channel_tx_power_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.6 LE Read Advertising Channel Tx Power Command
+        See Bluetooth spec Vol 2, Part E - 7.8.6 LE Read Advertising Physical Channel
+        Tx Power Command
         '''
         return bytes([HCI_SUCCESS, self.advertising_channel_tx_power])
 
@@ -710,50 +800,57 @@ class Controller:
 
         # Check that we don't already have a pending connection
         if self.link.get_pending_connection():
-            self.send_hci_packet(HCI_Command_Status_Event(
+            self.send_hci_packet(
+                HCI_Command_Status_Event(
                     status=HCI_COMMAND_DISALLOWED_ERROR,
                     num_hci_command_packets=1,
-                command_opcode          = command.op_code
-            ))
+                    command_opcode=command.op_code,
+                )
+            )
             return
 
         # Initiate the connection
         self.link.connect(self.random_address, command)
 
         # Say that the connection is pending
-        self.send_hci_packet(HCI_Command_Status_Event(
+        self.send_hci_packet(
+            HCI_Command_Status_Event(
                 status=HCI_COMMAND_STATUS_PENDING,
                 num_hci_command_packets=1,
-            command_opcode          = command.op_code
-        ))
+                command_opcode=command.op_code,
+            )
+        )
 
-    def on_hci_le_create_connection_cancel_command(self, command):
+    def on_hci_le_create_connection_cancel_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.13 LE Create Connection Cancel Command
         '''
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_read_filter_accept_list_size_command(self, command):
+    def on_hci_le_read_filter_accept_list_size_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.14 LE Read Filter Accept List Size Command
+        See Bluetooth spec Vol 2, Part E - 7.8.14 LE Read Filter Accept List Size
+        Command
         '''
         return bytes([HCI_SUCCESS, self.filter_accept_list_size])
 
-    def on_hci_le_clear_filter_accept_list_command(self, command):
+    def on_hci_le_clear_filter_accept_list_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.15 LE Clear Filter Accept List Command
         '''
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_add_device_to_filter_accept_list_command(self, command):
+    def on_hci_le_add_device_to_filter_accept_list_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.16 LE Add Device To Filter Accept List Command
+        See Bluetooth spec Vol 2, Part E - 7.8.16 LE Add Device To Filter Accept List
+        Command
         '''
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_remove_device_from_filter_accept_list_command(self, command):
+    def on_hci_le_remove_device_from_filter_accept_list_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.17 LE Remove Device From Filter Accept List Command
+        See Bluetooth spec Vol 2, Part E - 7.8.17 LE Remove Device From Filter Accept
+        List Command
         '''
         return bytes([HCI_SUCCESS])
 
@@ -763,20 +860,24 @@ class Controller:
         '''
 
         # First, say that the command is pending
-        self.send_hci_packet(HCI_Command_Status_Event(
+        self.send_hci_packet(
+            HCI_Command_Status_Event(
                 status=HCI_COMMAND_STATUS_PENDING,
                 num_hci_command_packets=1,
-            command_opcode          = command.op_code
-        ))
+                command_opcode=command.op_code,
+            )
+        )
 
         # Then send the remote features
-        self.send_hci_packet(HCI_LE_Read_Remote_Features_Complete_Event(
+        self.send_hci_packet(
+            HCI_LE_Read_Remote_Features_Complete_Event(
                 status=HCI_SUCCESS,
                 connection_handle=0,
-            le_features       = bytes.fromhex('dd40000000000000')
-        ))
+                le_features=bytes.fromhex('dd40000000000000'),
+            )
+        )
 
-    def on_hci_le_rand_command(self, command):
+    def on_hci_le_rand_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.23 LE Rand Command
         '''
@@ -788,8 +889,12 @@ class Controller:
         '''
 
         # Check the parameters
-        if not (connection := self.find_central_connection_by_handle(command.connection_handle)):
-            logger.warn('connection not found')
+        if not (
+            connection := self.find_central_connection_by_handle(
+                command.connection_handle
+            )
+        ):
+            logger.warning('connection not found')
             return bytes([HCI_INVALID_HCI_COMMAND_PARAMETERS_ERROR])
 
         # Notify that the connection is now encrypted
@@ -798,57 +903,68 @@ class Controller:
             connection.peer_address,
             command.random_number,
             command.encrypted_diversifier,
-            command.long_term_key
+            command.long_term_key,
         )
 
-        self.send_hci_packet(HCI_Command_Status_Event(
+        self.send_hci_packet(
+            HCI_Command_Status_Event(
                 status=HCI_COMMAND_STATUS_PENDING,
                 num_hci_command_packets=1,
-            command_opcode          = command.op_code
-        ))
+                command_opcode=command.op_code,
+            )
+        )
 
-    def on_hci_le_read_supported_states_command(self, command):
+        return None
+
+    def on_hci_le_read_supported_states_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.27 LE Read Supported States Command
         '''
         return bytes([HCI_SUCCESS]) + self.le_states
 
-    def on_hci_le_read_suggested_default_data_length_command(self, command):
+    def on_hci_le_read_suggested_default_data_length_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.34 LE Read Suggested Default Data Length Command
+        See Bluetooth spec Vol 2, Part E - 7.8.34 LE Read Suggested Default Data Length
+        Command
         '''
-        return struct.pack('<BHH',
+        return struct.pack(
+            '<BHH',
             HCI_SUCCESS,
             self.suggested_max_tx_octets,
-                           self.suggested_max_tx_time)
+            self.suggested_max_tx_time,
+        )
 
     def on_hci_le_write_suggested_default_data_length_command(self, command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.35 LE Write Suggested Default Data Length Command
+        See Bluetooth spec Vol 2, Part E - 7.8.35 LE Write Suggested Default Data Length
+        Command
         '''
-        self.suggested_max_tx_octets, self.suggested_max_tx_time = struct.unpack('<HH', command.parameters[:4])
+        self.suggested_max_tx_octets, self.suggested_max_tx_time = struct.unpack(
+            '<HH', command.parameters[:4]
+        )
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_read_local_p_256_public_key_command(self, command):
+    def on_hci_le_read_local_p_256_public_key_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.36 LE Read P-256 Public Key Command
         '''
         # TODO create key and send HCI_LE_Read_Local_P-256_Public_Key_Complete event
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_add_device_to_resolving_list_command(self, command):
+    def on_hci_le_add_device_to_resolving_list_command(self, _command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.38 LE Add Device To Resolving List Command
+        See Bluetooth spec Vol 2, Part E - 7.8.38 LE Add Device To Resolving List
+        Command
         '''
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_clear_resolving_list_command(self, command):
+    def on_hci_le_clear_resolving_list_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.40 LE Clear Resolving List Command
         '''
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_read_resolving_list_size_command(self, command):
+    def on_hci_le_read_resolving_list_size_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.41 LE Read Resolving List Size Command
         '''
@@ -856,7 +972,8 @@ class Controller:
 
     def on_hci_le_set_address_resolution_enable_command(self, command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.44 LE Set Address Resolution Enable Command
+        See Bluetooth spec Vol 2, Part E - 7.8.44 LE Set Address Resolution Enable
+        Command
         '''
         ret = HCI_SUCCESS
         if command.address_resolution_enable == 1:
@@ -869,12 +986,13 @@ class Controller:
 
     def on_hci_le_set_resolvable_private_address_timeout_command(self, command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.45 LE Set Resolvable Private Address Timeout Command
+        See Bluetooth spec Vol 2, Part E - 7.8.45 LE Set Resolvable Private Address
+        Timeout Command
         '''
         self.le_rpa_timeout = command.rpa_timeout
         return bytes([HCI_SUCCESS])
 
-    def on_hci_le_read_maximum_data_length_command(self, command):
+    def on_hci_le_read_maximum_data_length_command(self, _command):
         '''
         See Bluetooth spec Vol 2, Part E - 7.8.46 LE Read Maximum Data Length Command
         '''
@@ -884,19 +1002,19 @@ class Controller:
             self.supported_max_tx_octets,
             self.supported_max_tx_time,
             self.supported_max_rx_octets,
-            self.supported_max_rx_time
+            self.supported_max_rx_time,
         )
 
     def on_hci_le_read_phy_command(self, command):
         '''
-        See Bluetooth spec Vol 2, Part E - 7.8.47 LE Read PHY command
+        See Bluetooth spec Vol 2, Part E - 7.8.47 LE Read PHY Command
         '''
         return struct.pack(
             '<BHBB',
             HCI_SUCCESS,
             command.connection_handle,
             HCI_LE_1M_PHY,
-            HCI_LE_1M_PHY
+            HCI_LE_1M_PHY,
         )
 
     def on_hci_le_set_default_phy_command(self, command):
@@ -906,7 +1024,12 @@ class Controller:
         self.default_phy = {
             'all_phys': command.all_phys,
             'tx_phys': command.tx_phys,
-            'rx_phys':  command.rx_phys
+            'rx_phys': command.rx_phys,
         }
         return bytes([HCI_SUCCESS])
 
+    def on_hci_le_read_transmit_power_command(self, _command):
+        '''
+        See Bluetooth spec Vol 2, Part E - 7.8.74 LE Read Transmit Power Command
+        '''
+        return struct.pack('<BBB', HCI_SUCCESS, 0, 0)

bumble/core.py

@@ -15,6 +15,7 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 import struct
 
 from .company_ids import COMPANY_IDENTIFIERS
@@ -23,6 +24,8 @@ from .company_ids import COMPANY_IDENTIFIERS
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
+
 BT_CENTRAL_ROLE    = 0
 BT_PERIPHERAL_ROLE = 1
 
@@ -30,6 +33,9 @@ BT_BR_EDR_TRANSPORT = 0
 BT_LE_TRANSPORT     = 1
 
 
+# fmt: on
+
+
 # -----------------------------------------------------------------------------
 # Utils
 # -----------------------------------------------------------------------------
@@ -58,11 +64,19 @@ def padded_bytes(buffer, size):
     return buffer + bytes(padding_size)
 
 
+def get_dict_key_by_value(dictionary, value):
+    for key, val in dictionary.items():
+        if val == value:
+            return key
+    return None
+
+
 # -----------------------------------------------------------------------------
 # Exceptions
 # -----------------------------------------------------------------------------
 class BaseError(Exception):
     """Base class for errors with an error code, error name and namespace"""
+
     def __init__(self, error_code, error_namespace='', error_name='', details=''):
         super().__init__()
         self.error_code = error_code
@@ -87,7 +101,7 @@ class ProtocolError(BaseError):
     """Protocol Error"""
 
 
-class TimeoutError(Exception):
+class TimeoutError(Exception):  # pylint: disable=redefined-builtin
     """Timeout Error"""
 
 
@@ -99,12 +113,21 @@ class InvalidStateError(Exception):
     """Invalid State Error"""
 
 
-class ConnectionError(BaseError):
+class ConnectionError(BaseError):  # pylint: disable=redefined-builtin
     """Connection Error"""
+
     FAILURE = 0x01
     CONNECTION_REFUSED = 0x02
 
-    def __init__(self, error_code, transport, peer_address, error_namespace='', error_name='', details=''):
+    def __init__(
+        self,
+        error_code,
+        transport,
+        peer_address,
+        error_namespace='',
+        error_name='',
+        details='',
+    ):
         super().__init__(error_code, error_namespace, error_name, details)
         self.transport = transport
         self.peer_address = peer_address
@@ -121,26 +144,33 @@ class UUID:
     '''
     See Bluetooth spec Vol 3, Part B - 2.5.1 UUID
     '''
+
     BASE_UUID = bytes.fromhex('00001000800000805F9B34FB')
-    UUIDS = []  # Registry of all instances created
+    UUIDS: list[UUID] = []  # Registry of all instances created
 
     def __init__(self, uuid_str_or_int, name=None):
-        if type(uuid_str_or_int) is int:
+        if isinstance(uuid_str_or_int, int):
             self.uuid_bytes = struct.pack('<H', uuid_str_or_int)
         else:
             if len(uuid_str_or_int) == 36:
-                if uuid_str_or_int[8] != '-' or uuid_str_or_int[13] != '-' or uuid_str_or_int[18] != '-' or uuid_str_or_int[23] != '-':
+                if (
+                    uuid_str_or_int[8] != '-'
+                    or uuid_str_or_int[13] != '-'
+                    or uuid_str_or_int[18] != '-'
+                    or uuid_str_or_int[23] != '-'
+                ):
                     raise ValueError('invalid UUID format')
                 uuid_str = uuid_str_or_int.replace('-', '')
             else:
                 uuid_str = uuid_str_or_int
             if len(uuid_str) != 32 and len(uuid_str) != 8 and len(uuid_str) != 4:
-                raise ValueError('invalid UUID format')
+                raise ValueError(f"invalid UUID format: {uuid_str}")
             self.uuid_bytes = bytes(reversed(bytes.fromhex(uuid_str)))
         self.name = name
 
     def register(self):
-        # Register this object in the class registry, and update the entry's name if it wasn't set already
+        # Register this object in the class registry, and update the entry's name if
+        # it wasn't set already
         for uuid in self.UUIDS:
             if self == uuid:
                 if uuid.name is None:
@@ -152,13 +182,13 @@ class UUID:
 
     @classmethod
     def from_bytes(cls, uuid_bytes, name=None):
-        if len(uuid_bytes) in {2, 4, 16}:
+        if len(uuid_bytes) in (2, 4, 16):
             self = cls.__new__(cls)
             self.uuid_bytes = uuid_bytes
             self.name = name
 
             return self.register()
-        else:
+
         raise ValueError('only 2, 4 and 16 bytes are allowed')
 
     @classmethod
@@ -170,19 +200,20 @@ class UUID:
         return cls.from_bytes(struct.pack('<I', uuid_32), name)
 
     @classmethod
-    def parse_uuid(cls, bytes, offset):
-        return len(bytes), cls.from_bytes(bytes[offset:])
+    def parse_uuid(cls, uuid_as_bytes, offset):
+        return len(uuid_as_bytes), cls.from_bytes(uuid_as_bytes[offset:])
 
     @classmethod
-    def parse_uuid_2(cls, bytes, offset):
-        return offset + 2, cls.from_bytes(bytes[offset:offset + 2])
+    def parse_uuid_2(cls, uuid_as_bytes, offset):
+        return offset + 2, cls.from_bytes(uuid_as_bytes[offset : offset + 2])
 
     def to_bytes(self, force_128=False):
         if len(self.uuid_bytes) == 16 or not force_128:
             return self.uuid_bytes
-        elif len(self.uuid_bytes) == 4:
+
+        if len(self.uuid_bytes) == 4:
             return self.uuid_bytes + UUID.BASE_UUID
-        else:
+
         return self.uuid_bytes + bytes([0, 0]) + UUID.BASE_UUID
 
     def to_pdu_bytes(self):
@@ -197,14 +228,16 @@ class UUID:
     def to_hex_str(self):
         if len(self.uuid_bytes) == 2 or len(self.uuid_bytes) == 4:
             return bytes(reversed(self.uuid_bytes)).hex().upper()
-        else:
-            return ''.join([
+
+        return ''.join(
+            [
                 bytes(reversed(self.uuid_bytes[12:16])).hex(),
                 bytes(reversed(self.uuid_bytes[10:12])).hex(),
                 bytes(reversed(self.uuid_bytes[8:10])).hex(),
                 bytes(reversed(self.uuid_bytes[6:8])).hex(),
-                bytes(reversed(self.uuid_bytes[0:6])).hex()
-            ]).upper()
+                bytes(reversed(self.uuid_bytes[0:6])).hex(),
+            ]
+        ).upper()
 
     def __bytes__(self):
         return self.to_bytes()
@@ -212,7 +245,8 @@ class UUID:
     def __eq__(self, other):
         if isinstance(other, UUID):
             return self.to_bytes(force_128=True) == other.to_bytes(force_128=True)
-        elif type(other) is str:
+
+        if isinstance(other, str):
             return UUID(other) == self
 
         return False
@@ -222,22 +256,25 @@ class UUID:
 
     def __str__(self):
         if len(self.uuid_bytes) == 2:
-            v = struct.unpack('<H', self.uuid_bytes)[0]
-            result = f'UUID-16:{v:04X}'
+            uuid = struct.unpack('<H', self.uuid_bytes)[0]
+            result = f'UUID-16:{uuid:04X}'
         elif len(self.uuid_bytes) == 4:
-            v = struct.unpack('<I', self.uuid_bytes)[0]
-            result = f'UUID-32:{v:08X}'
+            uuid = struct.unpack('<I', self.uuid_bytes)[0]
+            result = f'UUID-32:{uuid:08X}'
         else:
-            result = '-'.join([
+            result = '-'.join(
+                [
                     bytes(reversed(self.uuid_bytes[12:16])).hex(),
                     bytes(reversed(self.uuid_bytes[10:12])).hex(),
                     bytes(reversed(self.uuid_bytes[8:10])).hex(),
                     bytes(reversed(self.uuid_bytes[6:8])).hex(),
-                bytes(reversed(self.uuid_bytes[0:6])).hex()
-            ]).upper()
+                    bytes(reversed(self.uuid_bytes[0:6])).hex(),
+                ]
+            ).upper()
+
         if self.name is not None:
             return result + f' ({self.name})'
-        else:
+
         return result
 
     def __repr__(self):
@@ -247,6 +284,8 @@ class UUID:
 # -----------------------------------------------------------------------------
 # Common UUID constants
 # -----------------------------------------------------------------------------
+# fmt: off
+# pylint: disable=line-too-long
 
 # Protocol Identifiers
 BT_SDP_PROTOCOL_ID                      = UUID.from_16_bits(0x0001, 'SDP')
@@ -352,11 +391,17 @@ BT_HDP_SERVICE                                       = UUID.from_16_bits(0x1400,
 BT_HDP_SOURCE_SERVICE                                = UUID.from_16_bits(0x1401, 'HDP Source')
 BT_HDP_SINK_SERVICE                                  = UUID.from_16_bits(0x1402, 'HDP Sink')
 
+# fmt: on
+# pylint: enable=line-too-long
+
 
 # -----------------------------------------------------------------------------
 # DeviceClass
 # -----------------------------------------------------------------------------
 class DeviceClass:
+    # fmt: off
+    # pylint: disable=line-too-long
+
     # Major Service Classes (flags combined with OR)
     LIMITED_DISCOVERABLE_MODE_SERVICE_CLASS = (1 << 0)
     LE_AUDIO_SERVICE_CLASS                  = (1 << 1)
@@ -524,11 +569,18 @@ class DeviceClass:
         PERIPHERAL_MAJOR_DEVICE_CLASS:  PERIPHERAL_MINOR_DEVICE_CLASS_NAMES
     }
 
+    # fmt: on
+    # pylint: enable=line-too-long
+
     @staticmethod
     def split_class_of_device(class_of_device):
         # Split the bit fields of the composite class of device value into:
         # (service_classes, major_device_class, minor_device_class)
-        return ((class_of_device >> 13 & 0x7FF), (class_of_device >> 8 & 0x1F), (class_of_device >> 2 & 0x3F))
+        return (
+            (class_of_device >> 13 & 0x7FF),
+            (class_of_device >> 8 & 0x1F),
+            (class_of_device >> 2 & 0x3F),
+        )
 
     @staticmethod
     def pack_class_of_device(service_classes, major_device_class, minor_device_class):
@@ -536,7 +588,9 @@ class DeviceClass:
 
     @staticmethod
     def service_class_labels(service_class_flags):
-        return bit_flags_to_strings(service_class_flags, DeviceClass.SERVICE_CLASS_LABELS)
+        return bit_flags_to_strings(
+            service_class_flags, DeviceClass.SERVICE_CLASS_LABELS
+        )
 
     @staticmethod
     def major_device_class_name(device_class):
@@ -554,6 +608,9 @@ class DeviceClass:
 # Advertising Data
 # -----------------------------------------------------------------------------
 class AdvertisingData:
+    # fmt: off
+    # pylint: disable=line-too-long
+
     # This list is only partial, it still needs to be filled in from the spec
     FLAGS                                          = 0x01
     INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS  = 0x02
@@ -665,7 +722,12 @@ class AdvertisingData:
     BR_EDR_CONTROLLER_FLAG            = 0x08
     BR_EDR_HOST_FLAG                  = 0x10
 
-    def __init__(self, ad_structures = []):
+    # fmt: on
+    # pylint: enable=line-too-long
+
+    def __init__(self, ad_structures=None):
+        if ad_structures is None:
+            ad_structures = []
         self.ad_structures = ad_structures[:]
 
     @staticmethod
@@ -676,19 +738,17 @@ class AdvertisingData:
 
     @staticmethod
     def flags_to_string(flags, short=False):
-        flag_names = [
-            'LE Limited',
-            'LE General',
-            'No BR/EDR',
-            'BR/EDR C',
-            'BR/EDR H'
-        ] if short else [
+        flag_names = (
+            ['LE Limited', 'LE General', 'No BR/EDR', 'BR/EDR C', 'BR/EDR H']
+            if short
+            else [
                 'LE Limited Discoverable Mode',
                 'LE General Discoverable Mode',
                 'BR/EDR Not Supported',
                 'Simultaneous LE and BR/EDR (Controller)',
-            'Simultaneous LE and BR/EDR (Host)'
+                'Simultaneous LE and BR/EDR (Host)',
             ]
+        )
         return ','.join(bit_flags_to_strings(flags, flag_names))
 
     @staticmethod
@@ -702,10 +762,12 @@ class AdvertisingData:
 
     @staticmethod
     def uuid_list_to_string(ad_data, uuid_size):
-        return ', '.join([
+        return ', '.join(
+            [
                 str(uuid)
                 for uuid in AdvertisingData.uuid_list_to_objects(ad_data, uuid_size)
-        ])
+            ]
+        )
 
     @staticmethod
     def ad_data_to_string(ad_type, ad_data):
@@ -765,55 +827,64 @@ class AdvertisingData:
 
         return f'[{ad_type_str}]: {ad_data_str}'
 
+    # pylint: disable=too-many-return-statements
     @staticmethod
     def ad_data_to_object(ad_type, ad_data):
-        if ad_type in {
+        if ad_type in (
             AdvertisingData.COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
             AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS
-        }:
+            AdvertisingData.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS,
+        ):
             return AdvertisingData.uuid_list_to_objects(ad_data, 2)
-        elif ad_type in {
+
+        if ad_type in (
             AdvertisingData.COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
             AdvertisingData.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS
-        }:
+            AdvertisingData.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS,
+        ):
             return AdvertisingData.uuid_list_to_objects(ad_data, 4)
-        elif ad_type in {
+
+        if ad_type in (
             AdvertisingData.COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
             AdvertisingData.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS
-        }:
+            AdvertisingData.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS,
+        ):
             return AdvertisingData.uuid_list_to_objects(ad_data, 16)
-        elif ad_type == AdvertisingData.SERVICE_DATA_16_BIT_UUID:
+
+        if ad_type == AdvertisingData.SERVICE_DATA_16_BIT_UUID:
             return (UUID.from_bytes(ad_data[:2]), ad_data[2:])
-        elif ad_type == AdvertisingData.SERVICE_DATA_32_BIT_UUID:
+
+        if ad_type == AdvertisingData.SERVICE_DATA_32_BIT_UUID:
             return (UUID.from_bytes(ad_data[:4]), ad_data[4:])
-        elif ad_type == AdvertisingData.SERVICE_DATA_128_BIT_UUID:
+
+        if ad_type == AdvertisingData.SERVICE_DATA_128_BIT_UUID:
             return (UUID.from_bytes(ad_data[:16]), ad_data[16:])
-        elif ad_type in {
+
+        if ad_type in (
             AdvertisingData.SHORTENED_LOCAL_NAME,
             AdvertisingData.COMPLETE_LOCAL_NAME,
-            AdvertisingData.URI
-        }:
+            AdvertisingData.URI,
+        ):
             return ad_data.decode("utf-8")
-        elif ad_type in {
-            AdvertisingData.TX_POWER_LEVEL,
-            AdvertisingData.FLAGS
-        }:
+
+        if ad_type in (AdvertisingData.TX_POWER_LEVEL, AdvertisingData.FLAGS):
             return ad_data[0]
-        elif ad_type in {
+
+        if ad_type in (
             AdvertisingData.APPEARANCE,
-            AdvertisingData.ADVERTISING_INTERVAL
-        }:
+            AdvertisingData.ADVERTISING_INTERVAL,
+        ):
             return struct.unpack('<H', ad_data)[0]
-        elif ad_type == AdvertisingData.CLASS_OF_DEVICE:
+
+        if ad_type == AdvertisingData.CLASS_OF_DEVICE:
             return struct.unpack('<I', bytes([*ad_data, 0]))[0]
-        elif ad_type == AdvertisingData.PERIPHERAL_CONNECTION_INTERVAL_RANGE:
+
+        if ad_type == AdvertisingData.PERIPHERAL_CONNECTION_INTERVAL_RANGE:
             return struct.unpack('<HH', ad_data)
-        elif ad_type == AdvertisingData.MANUFACTURER_SPECIFIC_DATA:
+
+        if ad_type == AdvertisingData.MANUFACTURER_SPECIFIC_DATA:
             return (struct.unpack_from('<H', ad_data, 0)[0], ad_data[2:])
-        else:
+
         return ad_data
 
     def append(self, data):
@@ -834,19 +905,29 @@ class AdvertisingData:
         If return_all is True, returns a (possibly empty) list of matches,
         else returns the first entry, or None if no structure matches.
         '''
+
         def process_ad_data(ad_data):
             return ad_data if raw else self.ad_data_to_object(type_id, ad_data)
 
         if return_all:
-            return [process_ad_data(ad[1]) for ad in self.ad_structures if ad[0] == type_id]
-        else:
-            return next((process_ad_data(ad[1]) for ad in self.ad_structures if ad[0] == type_id), None)
+            return [
+                process_ad_data(ad[1]) for ad in self.ad_structures if ad[0] == type_id
+            ]
+
+        return next(
+            (process_ad_data(ad[1]) for ad in self.ad_structures if ad[0] == type_id),
+            None,
+        )
 
     def __bytes__(self):
-        return b''.join([bytes([len(x[1]) + 1, x[0]]) + x[1] for x in self.ad_structures])
+        return b''.join(
+            [bytes([len(x[1]) + 1, x[0]]) + x[1] for x in self.ad_structures]
+        )
 
     def to_string(self, separator=', '):
-        return separator.join([AdvertisingData.ad_data_to_string(x[0], x[1]) for x in self.ad_structures])
+        return separator.join(
+            [AdvertisingData.ad_data_to_string(x[0], x[1]) for x in self.ad_structures]
+        )
 
     def __str__(self):
         return self.to_string()

bumble/crypto.py

@@ -24,19 +24,16 @@
 import logging
 import operator
 import platform
+
 if platform.system() != 'Emscripten':
     import secrets
-    from cryptography.hazmat.primitives.ciphers import (
-        Cipher,
-        algorithms,
-        modes
-    )
+    from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
     from cryptography.hazmat.primitives.asymmetric.ec import (
         generate_private_key,
         ECDH,
         EllipticCurvePublicNumbers,
         EllipticCurvePrivateNumbers,
-        SECP256R1
+        SECP256R1,
     )
     from cryptography.hazmat.primitives import cmac
 else:
@@ -66,16 +63,26 @@ class EccKey:
         d = int.from_bytes(d_bytes, byteorder='big', signed=False)
         x = int.from_bytes(x_bytes, byteorder='big', signed=False)
         y = int.from_bytes(y_bytes, byteorder='big', signed=False)
-        private_key = EllipticCurvePrivateNumbers(d, EllipticCurvePublicNumbers(x, y, SECP256R1())).private_key()
+        private_key = EllipticCurvePrivateNumbers(
+            d, EllipticCurvePublicNumbers(x, y, SECP256R1())
+        ).private_key()
         return cls(private_key)
 
     @property
     def x(self):
-        return self.private_key.public_key().public_numbers().x.to_bytes(32, byteorder='big')
+        return (
+            self.private_key.public_key()
+            .public_numbers()
+            .x.to_bytes(32, byteorder='big')
+        )
 
     @property
     def y(self):
-        return self.private_key.public_key().public_numbers().y.to_bytes(32, byteorder='big')
+        return (
+            self.private_key.public_key()
+            .public_numbers()
+            .y.to_bytes(32, byteorder='big')
+        )
 
     def dh(self, public_key_x, public_key_y):
         x = int.from_bytes(public_key_x, byteorder='big', signed=False)
@@ -92,7 +99,7 @@ class EccKey:
 
 # -----------------------------------------------------------------------------
 def xor(x, y):
-    assert(len(x) == len(y))
+    assert len(x) == len(y)
     return bytes(map(operator.xor, x, y))
 
 
@@ -118,7 +125,7 @@ def e(key, data):
 
 
 # -----------------------------------------------------------------------------
-def ah(k, r):
+def ah(k, r):  # pylint: disable=redefined-outer-name
     '''
     See Bluetooth spec Vol 3, Part H - 2.2.2 Random Address Hash function ah
     '''
@@ -129,9 +136,10 @@ def ah(k, r):
 
 
 # -----------------------------------------------------------------------------
-def c1(k, r, preq, pres, iat, rat, ia, ra):
+def c1(k, r, preq, pres, iat, rat, ia, ra):  # pylint: disable=redefined-outer-name
     '''
-    See Bluetooth spec, Vol 3, Part H - 2.2.3 Confirm value generation function c1 for LE Legacy Pairing
+    See Bluetooth spec, Vol 3, Part H - 2.2.3 Confirm value generation function c1 for
+    LE Legacy Pairing
     '''
 
     p1 = bytes([iat, rat]) + preq + pres
@@ -142,7 +150,8 @@ def c1(k, r, preq, pres, iat, rat, ia, ra):
 # -----------------------------------------------------------------------------
 def s1(k, r1, r2):
     '''
-    See Bluetooth spec, Vol 3, Part H - 2.2.4 Key generation function s1 for LE Legacy Pairing
+    See Bluetooth spec, Vol 3, Part H - 2.2.4 Key generation function s1 for LE Legacy
+    Pairing
     '''
 
     return e(k, r2[0:8] + r1[0:8])
@@ -163,71 +172,95 @@ def aes_cmac(m, k):
 # -----------------------------------------------------------------------------
 def f4(u, v, x, z):
     '''
-    See Bluetooth spec, Vol 3, Part H - 2.2.6 LE Secure Connections Confirm Value Generation Function f4
+    See Bluetooth spec, Vol 3, Part H - 2.2.6 LE Secure Connections Confirm Value
+    Generation Function f4
     '''
-    return bytes(reversed(aes_cmac(bytes(reversed(u)) + bytes(reversed(v)) + z, bytes(reversed(x)))))
+    return bytes(
+        reversed(
+            aes_cmac(bytes(reversed(u)) + bytes(reversed(v)) + z, bytes(reversed(x)))
+        )
+    )
 
 
 # -----------------------------------------------------------------------------
 def f5(w, n1, n2, a1, a2):
     '''
-    See Bluetooth spec, Vol 3, Part H - 2.2.7 LE Secure Connections Key Generation Function f5
+    See Bluetooth spec, Vol 3, Part H - 2.2.7 LE Secure Connections Key Generation
+    Function f5
 
     NOTE: this returns a tuple: (MacKey, LTK) in little-endian byte order
     '''
     salt = bytes.fromhex('6C888391AAF5A53860370BDB5A6083BE')
     t = aes_cmac(bytes(reversed(w)), salt)
-    key_id = bytes([0x62, 0x74, 0x6c, 0x65])
+    key_id = bytes([0x62, 0x74, 0x6C, 0x65])
     return (
-        bytes(reversed(aes_cmac(
-            bytes([0]) +
-            key_id +
-            bytes(reversed(n1)) +
-            bytes(reversed(n2)) +
-            bytes(reversed(a1)) +
-            bytes(reversed(a2)) +
-            bytes([1, 0]),
-            t
-        ))),
-        bytes(reversed(aes_cmac(
-            bytes([1]) +
-            key_id +
-            bytes(reversed(n1)) +
-            bytes(reversed(n2)) +
-            bytes(reversed(a1)) +
-            bytes(reversed(a2)) +
-            bytes([1, 0]),
-            t
-        )))
+        bytes(
+            reversed(
+                aes_cmac(
+                    bytes([0])
+                    + key_id
+                    + bytes(reversed(n1))
+                    + bytes(reversed(n2))
+                    + bytes(reversed(a1))
+                    + bytes(reversed(a2))
+                    + bytes([1, 0]),
+                    t,
+                )
+            )
+        ),
+        bytes(
+            reversed(
+                aes_cmac(
+                    bytes([1])
+                    + key_id
+                    + bytes(reversed(n1))
+                    + bytes(reversed(n2))
+                    + bytes(reversed(a1))
+                    + bytes(reversed(a2))
+                    + bytes([1, 0]),
+                    t,
+                )
+            )
+        ),
     )
 
 
 # -----------------------------------------------------------------------------
-def f6(w, n1, n2, r, io_cap, a1, a2):
+def f6(w, n1, n2, r, io_cap, a1, a2):  # pylint: disable=redefined-outer-name
     '''
-    See Bluetooth spec, Vol 3, Part H - 2.2.8 LE Secure Connections Check Value Generation Function f6
+    See Bluetooth spec, Vol 3, Part H - 2.2.8 LE Secure Connections Check Value
+    Generation Function f6
     '''
-    return bytes(reversed(aes_cmac(
-        bytes(reversed(n1)) +
-        bytes(reversed(n2)) +
-        bytes(reversed(r)) +
-        bytes(reversed(io_cap)) +
-        bytes(reversed(a1)) +
-        bytes(reversed(a2)),
-        bytes(reversed(w))
-    )))
+    return bytes(
+        reversed(
+            aes_cmac(
+                bytes(reversed(n1))
+                + bytes(reversed(n2))
+                + bytes(reversed(r))
+                + bytes(reversed(io_cap))
+                + bytes(reversed(a1))
+                + bytes(reversed(a2)),
+                bytes(reversed(w)),
+            )
+        )
+    )
 
 
 # -----------------------------------------------------------------------------
 def g2(u, v, x, y):
     '''
-    See Bluetooth spec, Vol 3, Part H - 2.2.9 LE Secure Connections Numeric Comparison Value Generation Function g2
+    See Bluetooth spec, Vol 3, Part H - 2.2.9 LE Secure Connections Numeric Comparison
+    Value Generation Function g2
     '''
     return int.from_bytes(
-        aes_cmac(bytes(reversed(u)) + bytes(reversed(v)) + bytes(reversed(y)), bytes(reversed(x)))[-4:],
-        byteorder='big'
+        aes_cmac(
+            bytes(reversed(u)) + bytes(reversed(v)) + bytes(reversed(y)),
+            bytes(reversed(x)),
+        )[-4:],
+        byteorder='big',
     )
 
+
 # -----------------------------------------------------------------------------
 def h6(w, key_id):
     '''
@@ -235,6 +268,7 @@ def h6(w, key_id):
     '''
     return aes_cmac(key_id, w)
 
+
 # -----------------------------------------------------------------------------
 def h7(salt, w):
     '''

bumble/gap.py

@@ -23,7 +23,7 @@ from .gatt import (
     Characteristic,
     GATT_GENERIC_ACCESS_SERVICE,
     GATT_DEVICE_NAME_CHARACTERISTIC,
-    GATT_APPEARANCE_CHARACTERISTIC
+    GATT_APPEARANCE_CHARACTERISTIC,
 )
 
 # -----------------------------------------------------------------------------
@@ -43,17 +43,17 @@ class GenericAccessService(Service):
             GATT_DEVICE_NAME_CHARACTERISTIC,
             Characteristic.READ,
             Characteristic.READABLE,
-            device_name.encode('utf-8')[:248]
+            device_name.encode('utf-8')[:248],
         )
 
         appearance_characteristic = Characteristic(
             GATT_APPEARANCE_CHARACTERISTIC,
             Characteristic.READ,
             Characteristic.READABLE,
-            struct.pack('<H', (appearance[0] << 6) | appearance[1])
+            struct.pack('<H', (appearance[0] << 6) | appearance[1]),
         )
 
-        super().__init__(GATT_GENERIC_ACCESS_SERVICE, [
-            device_name_characteristic,
-            appearance_characteristic
-        ])
+        super().__init__(
+            GATT_GENERIC_ACCESS_SERVICE,
+            [device_name_characteristic, appearance_characteristic],
+        )

bumble/gatt.py

@@ -22,16 +22,18 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 import asyncio
 import enum
-import types
+import functools
 import logging
-from pyee import EventEmitter
+import struct
+from typing import Sequence
 from colors import color
 
-from .core import *
-from .hci import *
-from .att import *
+from .core import UUID, get_dict_key_by_value
+from .att import Attribute
+
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -41,6 +43,9 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
+# pylint: disable=line-too-long
+
 GATT_REQUEST_TIMEOUT = 30  # seconds
 
 GATT_MAX_ATTRIBUTE_VALUE_SIZE = 512
@@ -151,6 +156,14 @@ GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC = UUID.from_16_bits(0x2A39, 'Heart
 # Battery Service
 GATT_BATTERY_LEVEL_CHARACTERISTIC = UUID.from_16_bits(0x2A19, 'Battery Level')
 
+# ASHA Service
+GATT_ASHA_SERVICE                             = UUID.from_16_bits(0xFDF0, 'Audio Streaming for Hearing Aid')
+GATT_ASHA_READ_ONLY_PROPERTIES_CHARACTERISTIC = UUID('6333651e-c481-4a3e-9169-7c902aad37bb', 'ReadOnlyProperties')
+GATT_ASHA_AUDIO_CONTROL_POINT_CHARACTERISTIC  = UUID('f0d4de7e-4a88-476c-9d9f-1937b0996cc0', 'AudioControlPoint')
+GATT_ASHA_AUDIO_STATUS_CHARACTERISTIC         = UUID('38663f1a-e711-4cac-b641-326b56404837', 'AudioStatus')
+GATT_ASHA_VOLUME_CHARACTERISTIC               = UUID('00e4ca9e-ab14-41e4-8823-f9e70c7e91df', 'Volume')
+GATT_ASHA_LE_PSM_OUT_CHARACTERISTIC           = UUID('2d410339-82b6-42aa-b34e-e2e01df8cc1a', 'LE_PSM_OUT')
+
 # Misc
 GATT_DEVICE_NAME_CHARACTERISTIC                                = UUID.from_16_bits(0x2A00, 'Device Name')
 GATT_APPEARANCE_CHARACTERISTIC                                 = UUID.from_16_bits(0x2A01, 'Appearance')
@@ -165,11 +178,15 @@ GATT_CURRENT_TIME_CHARACTERISTIC                               = UUID.from_16_bi
 GATT_BOOT_KEYBOARD_OUTPUT_REPORT_CHARACTERISTIC                = UUID.from_16_bits(0x2A32, 'Boot Keyboard Output Report')
 GATT_CENTRAL_ADDRESS_RESOLUTION__CHARACTERISTIC                = UUID.from_16_bits(0x2AA6, 'Central Address Resolution')
 
+# fmt: on
+# pylint: enable=line-too-long
+
 
 # -----------------------------------------------------------------------------
 # Utils
 # -----------------------------------------------------------------------------
 
+
 def show_services(services):
     for service in services:
         print(color(str(service), 'cyan'))
@@ -187,23 +204,38 @@ class Service(Attribute):
     See Vol 3, Part G - 3.1 SERVICE DEFINITION
     '''
 
-    def __init__(self, uuid, characteristics, primary=True):
+    def __init__(self, uuid, characteristics: list[Characteristic], primary=True):
         # Convert the uuid to a UUID object if it isn't already
-        if type(uuid) is str:
+        if isinstance(uuid, str):
             uuid = UUID(uuid)
 
         super().__init__(
-            GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE if primary else GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
+            GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE
+            if primary
+            else GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
             Attribute.READABLE,
-            uuid.to_pdu_bytes()
+            uuid.to_pdu_bytes(),
         )
         self.uuid = uuid
-        self.included_services = []
+        # self.included_services = []
         self.characteristics = characteristics[:]
         self.primary = primary
 
+    def get_advertising_data(self):
+        """
+        Get Service specific advertising data
+        Defined by each Service, default value is empty
+        :return Service data for advertising
+        """
+        return None
+
     def __str__(self):
-        return f'Service(handle=0x{self.handle:04X}, end=0x{self.end_group_handle:04X}, uuid={self.uuid}){"" if self.primary else "*"}'
+        return (
+            f'Service(handle=0x{self.handle:04X}, '
+            f'end=0x{self.end_group_handle:04X}, '
+            f'uuid={self.uuid})'
+            f'{"" if self.primary else "*"}'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -212,6 +244,7 @@ class TemplateService(Service):
     Convenience abstract class that can be used by profile-specific subclasses that want
     to expose their UUID as a class property
     '''
+
     UUID = None
 
     def __init__(self, characteristics, primary=True):
@@ -230,9 +263,9 @@ class Characteristic(Attribute):
     WRITE_WITHOUT_RESPONSE = 0x04
     WRITE = 0x08
     NOTIFY = 0x10
-    INDICATE                    = 0X20
-    AUTHENTICATED_SIGNED_WRITES = 0X40
-    EXTENDED_PROPERTIES         = 0X80
+    INDICATE = 0x20
+    AUTHENTICATED_SIGNED_WRITES = 0x40
+    EXTENDED_PROPERTIES = 0x80
 
     PROPERTY_NAMES = {
         BROADCAST: 'BROADCAST',
@@ -242,23 +275,44 @@ class Characteristic(Attribute):
         NOTIFY: 'NOTIFY',
         INDICATE: 'INDICATE',
         AUTHENTICATED_SIGNED_WRITES: 'AUTHENTICATED_SIGNED_WRITES',
-        EXTENDED_PROPERTIES:         'EXTENDED_PROPERTIES'
+        EXTENDED_PROPERTIES: 'EXTENDED_PROPERTIES',
     }
 
     @staticmethod
-    def property_name(property):
-        return Characteristic.PROPERTY_NAMES.get(property, '')
+    def property_name(property_int):
+        return Characteristic.PROPERTY_NAMES.get(property_int, '')
 
     @staticmethod
     def properties_as_string(properties):
-        return ','.join([
-            Characteristic.property_name(p) for p in Characteristic.PROPERTY_NAMES.keys()
+        return ','.join(
+            [
+                Characteristic.property_name(p)
+                for p in Characteristic.PROPERTY_NAMES
                 if properties & p
-        ])
+            ]
+        )
 
-    def __init__(self, uuid, properties, permissions, value = b'', descriptors = []):
+    @staticmethod
+    def string_to_properties(properties_str: str):
+        return functools.reduce(
+            lambda x, y: x | get_dict_key_by_value(Characteristic.PROPERTY_NAMES, y),
+            properties_str.split(","),
+            0,
+        )
+
+    def __init__(
+        self,
+        uuid,
+        properties,
+        permissions,
+        value=b'',
+        descriptors: Sequence[Descriptor] = (),
+    ):
         super().__init__(uuid, permissions, value)
         self.uuid = self.type
+        if isinstance(properties, str):
+            self.properties = Characteristic.string_to_properties(properties)
+        else:
             self.properties = properties
         self.descriptors = descriptors
 
@@ -267,8 +321,41 @@ class Characteristic(Attribute):
             if descriptor.type == descriptor_type:
                 return descriptor
 
+        return None
+
     def __str__(self):
-        return f'Characteristic(handle=0x{self.handle:04X}, end=0x{self.end_group_handle:04X}, uuid={self.uuid}, properties={Characteristic.properties_as_string(self.properties)})'
+        return (
+            f'Characteristic(handle=0x{self.handle:04X}, '
+            f'end=0x{self.end_group_handle:04X}, '
+            f'uuid={self.uuid}, '
+            f'properties={Characteristic.properties_as_string(self.properties)})'
+        )
+
+
+# -----------------------------------------------------------------------------
+class CharacteristicDeclaration(Attribute):
+    '''
+    See Vol 3, Part G - 3.3.1 CHARACTERISTIC DECLARATION
+    '''
+
+    def __init__(self, characteristic, value_handle):
+        declaration_bytes = (
+            struct.pack('<BH', characteristic.properties, value_handle)
+            + characteristic.uuid.to_pdu_bytes()
+        )
+        super().__init__(
+            GATT_CHARACTERISTIC_ATTRIBUTE_TYPE, Attribute.READABLE, declaration_bytes
+        )
+        self.value_handle = value_handle
+        self.characteristic = characteristic
+
+    def __str__(self):
+        return (
+            f'CharacteristicDeclaration(handle=0x{self.handle:04X}, '
+            f'value_handle=0x{self.value_handle:04X}, '
+            f'uuid={self.characteristic.uuid}, properties='
+            f'{Characteristic.properties_as_string(self.characteristic.properties)})'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -277,6 +364,7 @@ class CharacteristicValue:
     Characteristic value where reading and/or writing is delegated to functions
     passed as arguments to the constructor.
     '''
+
     def __init__(self, read=None, write=None):
         self._read = read
         self._write = write
@@ -303,14 +391,14 @@ class CharacteristicAdapter:
     If the characteristic has a `subscribe` method, it is wrapped with one where
     the values are decoded before being passed to the subscriber.
     '''
+
     def __init__(self, characteristic):
         self.wrapped_characteristic = characteristic
         self.subscribers = {}  # Map from subscriber to proxy subscriber
 
-        if (
-            asyncio.iscoroutinefunction(characteristic.read_value) and
-            asyncio.iscoroutinefunction(characteristic.write_value)
-        ):
+        if asyncio.iscoroutinefunction(
+            characteristic.read_value
+        ) and asyncio.iscoroutinefunction(characteristic.write_value):
             self.read_value = self.read_decoded_value
             self.write_value = self.write_decoded_value
         else:
@@ -327,14 +415,14 @@ class CharacteristicAdapter:
         return getattr(self.wrapped_characteristic, name)
 
     def __setattr__(self, name, value):
-        if name in {
+        if name in (
             'wrapped_characteristic',
             'subscribers',
             'read_value',
             'write_value',
             'subscribe',
-            'unsubscribe'
-        }:
+            'unsubscribe',
+        ):
             super().__setattr__(name, value)
         else:
             setattr(self.wrapped_characteristic, name, value)
@@ -343,15 +431,16 @@ class CharacteristicAdapter:
         return self.encode_value(self.wrapped_characteristic.read_value(connection))
 
     def write_encoded_value(self, connection, value):
-        return self.wrapped_characteristic.write_value(connection, self.decode_value(value))
+        return self.wrapped_characteristic.write_value(
+            connection, self.decode_value(value)
+        )
 
     async def read_decoded_value(self):
         return self.decode_value(await self.wrapped_characteristic.read_value())
 
     async def write_decoded_value(self, value, with_response=False):
         return await self.wrapped_characteristic.write_value(
-            self.encode_value(value),
-            with_response
+            self.encode_value(value), with_response
         )
 
     def encode_value(self, value):
@@ -371,6 +460,7 @@ class CharacteristicAdapter:
 
                 def on_change(value):
                     original_subscriber(self.decode_value(value))
+
                 self.subscribers[subscriber] = on_change
                 subscriber = on_change
 
@@ -392,6 +482,7 @@ class DelegatedCharacteristicAdapter(CharacteristicAdapter):
     '''
     Adapter that converts bytes values using an encode and a decode function.
     '''
+
     def __init__(self, characteristic, encode=None, decode=None):
         super().__init__(characteristic)
         self.encode = encode
@@ -414,9 +505,10 @@ class PackedCharacteristicAdapter(CharacteristicAdapter):
     they return/accept a tuple with the same number of elements as is required for
     the format.
     '''
-    def __init__(self, characteristic, format):
+
+    def __init__(self, characteristic, pack_format):
         super().__init__(characteristic)
-        self.struct = struct.Struct(format)
+        self.struct = struct.Struct(pack_format)
 
     def pack(self, *values):
         return self.struct.pack(*values)
@@ -425,7 +517,7 @@ class PackedCharacteristicAdapter(CharacteristicAdapter):
         return self.struct.unpack(buffer)
 
     def encode_value(self, value):
-        return self.pack(*value if type(value) is tuple else (value,))
+        return self.pack(*value if isinstance(value, tuple) else (value,))
 
     def decode_value(self, value):
         unpacked = self.unpack(value)
@@ -438,13 +530,15 @@ class MappedCharacteristicAdapter(PackedCharacteristicAdapter):
     Adapter that packs/unpacks characteristic values according to a standard
     Python `struct` format.
     The adapted `read_value` and `write_value` methods return/accept aa dictionary which
-    is packed/unpacked according to format, with the arguments extracted from the dictionary
-    by key, in the same order as they occur in the `keys` parameter.
+    is packed/unpacked according to format, with the arguments extracted from the
+    dictionary by key, in the same order as they occur in the `keys` parameter.
     '''
-    def __init__(self, characteristic, format, keys):
-        super().__init__(characteristic, format)
+
+    def __init__(self, characteristic, pack_format, keys):
+        super().__init__(characteristic, pack_format)
         self.keys = keys
 
+    # pylint: disable=arguments-differ
     def pack(self, values):
         return super().pack(*(values[key] for key in self.keys))
 
@@ -457,6 +551,7 @@ class UTF8CharacteristicAdapter(CharacteristicAdapter):
     '''
     Adapter that converts strings to/from bytes using UTF-8 encoding
     '''
+
     def encode_value(self, value):
         return value.encode('utf-8')
 
@@ -470,17 +565,20 @@ class Descriptor(Attribute):
     See Vol 3, Part G - 3.3.3 Characteristic Descriptor Declarations
     '''
 
-    def __init__(self, descriptor_type, permissions, value = b''):
-        super().__init__(descriptor_type, permissions, value)
-
     def __str__(self):
-        return f'Descriptor(handle=0x{self.handle:04X}, type={self.type}, value={self.read_value(None).hex()})'
+        return (
+            f'Descriptor(handle=0x{self.handle:04X}, '
+            f'type={self.type}, '
+            f'value={self.read_value(None).hex()})'
+        )
 
 
 class ClientCharacteristicConfigurationBits(enum.IntFlag):
     '''
-    See Vol 3, Part G - 3.3.3.3 - Table 3.11 Client Characteristic Configuration bit field definition
+    See Vol 3, Part G - 3.3.3.3 - Table 3.11 Client Characteristic Configuration bit
+    field definition
     '''
+
     DEFAULT = 0x0000
     NOTIFICATION = 0x0001
     INDICATION = 0x0002

bumble/gatt_client.py

@@ -28,15 +28,40 @@ import logging
 import struct
 
 from colors import color
+from pyee import EventEmitter
 
-from .att import *
-from .core import InvalidStateError, ProtocolError, TimeoutError
-from .gatt import (GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
+from .hci import HCI_Constant
+from .att import (
+    ATT_ATTRIBUTE_NOT_FOUND_ERROR,
+    ATT_ATTRIBUTE_NOT_LONG_ERROR,
+    ATT_CID,
+    ATT_DEFAULT_MTU,
+    ATT_ERROR_RESPONSE,
+    ATT_INVALID_OFFSET_ERROR,
+    ATT_PDU,
+    ATT_RESPONSES,
+    ATT_Exchange_MTU_Request,
+    ATT_Find_By_Type_Value_Request,
+    ATT_Find_Information_Request,
+    ATT_Handle_Value_Confirmation,
+    ATT_Read_Blob_Request,
+    ATT_Read_By_Group_Type_Request,
+    ATT_Read_By_Type_Request,
+    ATT_Read_Request,
+    ATT_Write_Command,
+    ATT_Write_Request,
+)
+from . import core
+from .core import UUID, InvalidStateError, ProtocolError
+from .gatt import (
+    GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
     GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR,
-                   GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE, GATT_REQUEST_TIMEOUT,
-                   GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE, Characteristic,
-                   ClientCharacteristicConfigurationBits)
-from .hci import *
+    GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
+    GATT_REQUEST_TIMEOUT,
+    GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
+    Characteristic,
+    ClientCharacteristicConfigurationBits,
+)
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -56,10 +81,14 @@ class AttributeProxy(EventEmitter):
         self.type = attribute_type
 
     async def read_value(self, no_long_read=False):
-        return self.decode_value(await self.client.read_value(self.handle, no_long_read))
+        return self.decode_value(
+            await self.client.read_value(self.handle, no_long_read)
+        )
 
     async def write_value(self, value, with_response=False):
-        return await self.client.write_value(self.handle, self.encode_value(value), with_response)
+        return await self.client.write_value(
+            self.handle, self.encode_value(value), with_response
+        )
 
     def encode_value(self, value):
         return value
@@ -68,24 +97,29 @@ class AttributeProxy(EventEmitter):
         return value_bytes
 
     def __str__(self):
-        return f'Attribute(handle=0x{self.handle:04X}, type={self.uuid})'
+        return f'Attribute(handle=0x{self.handle:04X}, type={self.type})'
 
 
 class ServiceProxy(AttributeProxy):
     @staticmethod
-    def from_client(cls, client, service_uuid):
-        # The service and its characteristics are considered to have already been discovered
+    def from_client(service_class, client, service_uuid):
+        # The service and its characteristics are considered to have already been
+        # discovered
         services = client.get_services_by_uuid(service_uuid)
         service = services[0] if services else None
-        return cls(service) if service else None
+        return service_class(service) if service else None
 
     def __init__(self, client, handle, end_group_handle, uuid, primary=True):
-        attribute_type = GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE if primary else GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE
+        attribute_type = (
+            GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE
+            if primary
+            else GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE
+        )
         super().__init__(client, handle, end_group_handle, attribute_type)
         self.uuid = uuid
         self.characteristics = []
 
-    async def discover_characteristics(self, uuids=[]):
+    async def discover_characteristics(self, uuids=()):
         return await self.client.discover_characteristics(uuids, self)
 
     def get_characteristics_by_uuid(self, uuid):
@@ -109,6 +143,8 @@ class CharacteristicProxy(AttributeProxy):
             if descriptor.type == descriptor_type:
                 return descriptor
 
+        return None
+
     async def discover_descriptors(self):
         return await self.client.discover_descriptors(self)
 
@@ -123,6 +159,7 @@ class CharacteristicProxy(AttributeProxy):
 
                 def on_change(value):
                     original_subscriber(self.decode_value(value))
+
                 self.subscribers[subscriber] = on_change
                 subscriber = on_change
 
@@ -135,7 +172,11 @@ class CharacteristicProxy(AttributeProxy):
         return await self.client.unsubscribe(self, subscriber)
 
     def __str__(self):
-        return f'Characteristic(handle=0x{self.handle:04X}, uuid={self.uuid}, properties={Characteristic.properties_as_string(self.properties)})'
+        return (
+            f'Characteristic(handle=0x{self.handle:04X}, '
+            f'uuid={self.uuid}, '
+            f'properties={Characteristic.properties_as_string(self.properties)})'
+        )
 
 
 class DescriptorProxy(AttributeProxy):
@@ -150,6 +191,7 @@ class ProfileServiceProxy:
     '''
     Base class for profile-specific service proxies
     '''
+
     @classmethod
     def from_client(cls, client):
         return ServiceProxy.from_client(cls, client, cls.SERVICE_CLASS.UUID)
@@ -165,7 +207,9 @@ class Client:
         self.request_semaphore = asyncio.Semaphore(1)
         self.pending_request = None
         self.pending_response = None
-        self.notification_subscribers = {}  # Notification subscribers, by attribute handle
+        self.notification_subscribers = (
+            {}
+        )  # Notification subscribers, by attribute handle
         self.indication_subscribers = {}  # Indication subscribers, by attribute handle
         self.services = []
 
@@ -173,11 +217,15 @@ class Client:
         self.connection.send_l2cap_pdu(ATT_CID, pdu)
 
     async def send_command(self, command):
-        logger.debug(f'GATT Command from client: [0x{self.connection.handle:04X}] {command}')
+        logger.debug(
+            f'GATT Command from client: [0x{self.connection.handle:04X}] {command}'
+        )
         self.send_gatt_pdu(command.to_bytes())
 
     async def send_request(self, request):
-        logger.debug(f'GATT Request from client: [0x{self.connection.handle:04X}] {request}')
+        logger.debug(
+            f'GATT Request from client: [0x{self.connection.handle:04X}] {request}'
+        )
 
         # Wait until we can send (only one pending command at a time for the connection)
         response = None
@@ -191,10 +239,12 @@ class Client:
 
             try:
                 self.send_gatt_pdu(request.to_bytes())
-                response = await asyncio.wait_for(self.pending_response, GATT_REQUEST_TIMEOUT)
-            except asyncio.TimeoutError:
+                response = await asyncio.wait_for(
+                    self.pending_response, GATT_REQUEST_TIMEOUT
+                )
+            except asyncio.TimeoutError as error:
                 logger.warning(color('!!! GATT Request timeout', 'red'))
-                raise TimeoutError(f'GATT timeout for {request.name}')
+                raise core.TimeoutError(f'GATT timeout for {request.name}') from error
             finally:
                 self.pending_request = None
                 self.pending_response = None
@@ -202,7 +252,10 @@ class Client:
         return response
 
     def send_confirmation(self, confirmation):
-        logger.debug(f'GATT Confirmation from client: [0x{self.connection.handle:04X}] {confirmation}')
+        logger.debug(
+            f'GATT Confirmation from client: [0x{self.connection.handle:04X}] '
+            f'{confirmation}'
+        )
         self.send_gatt_pdu(confirmation.to_bytes())
 
     async def request_mtu(self, mtu):
@@ -224,7 +277,7 @@ class Client:
                 response.error_code,
                 'att',
                 ATT_PDU.error_name(response.error_code),
-                response
+                response,
             )
 
         # Compute the final MTU
@@ -237,7 +290,11 @@ class Client:
 
     def get_characteristics_by_uuid(self, uuid, service=None):
         services = [service] if service else self.services
-        return [c for c in [c for s in services for c in s.characteristics] if c.uuid == uuid]
+        return [
+            c
+            for c in [c for s in services for c in s.characteristics]
+            if c.uuid == uuid
+        ]
 
     def on_service_discovered(self, service):
         '''Add a service to the service list if it wasn't already there'''
@@ -260,7 +317,7 @@ class Client:
                 ATT_Read_By_Group_Type_Request(
                     starting_handle=starting_handle,
                     ending_handle=0xFFFF,
-                    attribute_group_type = GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE
+                    attribute_group_type=GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
                 )
             )
             if response is None:
@@ -271,15 +328,27 @@ class Client:
             if response.op_code == ATT_ERROR_RESPONSE:
                 if response.error_code != ATT_ATTRIBUTE_NOT_FOUND_ERROR:
                     # Unexpected end
-                    logger.warning(f'!!! unexpected error while discovering services: {HCI_Constant.error_name(response.error_code)}')
+                    logger.warning(
+                        '!!! unexpected error while discovering services: '
+                        f'{HCI_Constant.error_name(response.error_code)}'
+                    )
                     # TODO raise appropriate exception
                     return
                 break
 
-            for attribute_handle, end_group_handle, attribute_value in response.attributes:
-                if attribute_handle < starting_handle or end_group_handle < attribute_handle:
+            for (
+                attribute_handle,
+                end_group_handle,
+                attribute_value,
+            ) in response.attributes:
+                if (
+                    attribute_handle < starting_handle
+                    or end_group_handle < attribute_handle
+                ):
                     # Something's not right
-                    logger.warning(f'bogus handle values: {attribute_handle} {end_group_handle}')
+                    logger.warning(
+                        f'bogus handle values: {attribute_handle} {end_group_handle}'
+                    )
                     return
 
                 # Create a service proxy for this service
@@ -288,7 +357,7 @@ class Client:
                     attribute_handle,
                     end_group_handle,
                     UUID.from_bytes(attribute_value),
-                    True
+                    True,
                 )
 
                 # Filter out returned services based on the given uuids list
@@ -313,7 +382,7 @@ class Client:
         '''
 
         # Force uuid to be a UUID object
-        if type(uuid) is str:
+        if isinstance(uuid, str):
             uuid = UUID(uuid)
 
         starting_handle = 0x0001
@@ -324,7 +393,7 @@ class Client:
                     starting_handle=starting_handle,
                     ending_handle=0xFFFF,
                     attribute_type=GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
-                    attribute_value = uuid.to_pdu_bytes()
+                    attribute_value=uuid.to_pdu_bytes(),
                 )
             )
             if response is None:
@@ -335,19 +404,29 @@ class Client:
             if response.op_code == ATT_ERROR_RESPONSE:
                 if response.error_code != ATT_ATTRIBUTE_NOT_FOUND_ERROR:
                     # Unexpected end
-                    logger.warning(f'!!! unexpected error while discovering services: {HCI_Constant.error_name(response.error_code)}')
+                    logger.warning(
+                        '!!! unexpected error while discovering services: '
+                        f'{HCI_Constant.error_name(response.error_code)}'
+                    )
                     # TODO raise appropriate exception
                     return
                 break
 
             for attribute_handle, end_group_handle in response.handles_information:
-                if attribute_handle < starting_handle or end_group_handle < attribute_handle:
+                if (
+                    attribute_handle < starting_handle
+                    or end_group_handle < attribute_handle
+                ):
                     # Something's not right
-                    logger.warning(f'bogus handle values: {attribute_handle} {end_group_handle}')
+                    logger.warning(
+                        f'bogus handle values: {attribute_handle} {end_group_handle}'
+                    )
                     return
 
                 # Create a service proxy for this service
-                service = ServiceProxy(self, attribute_handle, end_group_handle, uuid, True)
+                service = ServiceProxy(
+                    self, attribute_handle, end_group_handle, uuid, True
+                )
 
                 # Add the service to the peer's service list
                 services.append(service)
@@ -366,7 +445,7 @@ class Client:
 
         return services
 
-    async def discover_included_services(self, service):
+    async def discover_included_services(self, _service):
         '''
         See Vol 3, Part G - 4.5.1 Find Included Services
         '''
@@ -375,11 +454,12 @@ class Client:
 
     async def discover_characteristics(self, uuids, service):
         '''
-        See Vol 3, Part G - 4.6.1 Discover All Characteristics of a Service and 4.6.2 Discover Characteristics by UUID
+        See Vol 3, Part G - 4.6.1 Discover All Characteristics of a Service and 4.6.2
+        Discover Characteristics by UUID
         '''
 
         # Cast the UUIDs type from string to object if needed
-        uuids = [UUID(uuid) if type(uuid) is str else uuid for uuid in uuids]
+        uuids = [UUID(uuid) if isinstance(uuid, str) else uuid for uuid in uuids]
 
         # Decide which services to discover for
         services = [service] if service else self.services
@@ -396,7 +476,7 @@ class Client:
                     ATT_Read_By_Type_Request(
                         starting_handle=starting_handle,
                         ending_handle=ending_handle,
-                        attribute_type  = GATT_CHARACTERISTIC_ATTRIBUTE_TYPE
+                        attribute_type=GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
                     )
                 )
                 if response is None:
@@ -407,7 +487,10 @@ class Client:
                 if response.op_code == ATT_ERROR_RESPONSE:
                     if response.error_code != ATT_ATTRIBUTE_NOT_FOUND_ERROR:
                         # Unexpected end
-                        logger.warning(f'!!! unexpected error while discovering characteristics: {HCI_Constant.error_name(response.error_code)}')
+                        logger.warning(
+                            '!!! unexpected error while discovering characteristics: '
+                            f'{HCI_Constant.error_name(response.error_code)}'
+                        )
                         # TODO raise appropriate exception
                         return
                     break
@@ -425,7 +508,9 @@ class Client:
 
                     properties, handle = struct.unpack_from('<BH', attribute_value)
                     characteristic_uuid = UUID.from_bytes(attribute_value[3:])
-                    characteristic = CharacteristicProxy(self, handle, 0, characteristic_uuid, properties)
+                    characteristic = CharacteristicProxy(
+                        self, handle, 0, characteristic_uuid, properties
+                    )
 
                     # Set the previous characteristic's end handle
                     if characteristics:
@@ -441,13 +526,17 @@ class Client:
                 characteristics[-1].end_group_handle = service.end_group_handle
 
             # Set the service's characteristics
-            characteristics = [c for c in characteristics if not uuids or c.uuid in uuids]
+            characteristics = [
+                c for c in characteristics if not uuids or c.uuid in uuids
+            ]
             service.characteristics = characteristics
             discovered_characteristics.extend(characteristics)
 
         return discovered_characteristics
 
-    async def discover_descriptors(self, characteristic = None, start_handle = None, end_handle = None):
+    async def discover_descriptors(
+        self, characteristic=None, start_handle=None, end_handle=None
+    ):
         '''
         See Vol 3, Part G - 4.7.1 Discover All Characteristic Descriptors
         '''
@@ -464,8 +553,7 @@ class Client:
         while starting_handle <= ending_handle:
             response = await self.send_request(
                 ATT_Find_Information_Request(
-                    starting_handle = starting_handle,
-                    ending_handle   = ending_handle
+                    starting_handle=starting_handle, ending_handle=ending_handle
                 )
             )
             if response is None:
@@ -476,7 +564,10 @@ class Client:
             if response.op_code == ATT_ERROR_RESPONSE:
                 if response.error_code != ATT_ATTRIBUTE_NOT_FOUND_ERROR:
                     # Unexpected end
-                    logger.warning(f'!!! unexpected error while discovering descriptors: {HCI_Constant.error_name(response.error_code)}')
+                    logger.warning(
+                        '!!! unexpected error while discovering descriptors: '
+                        f'{HCI_Constant.error_name(response.error_code)}'
+                    )
                     # TODO raise appropriate exception
                     return []
                 break
@@ -492,7 +583,9 @@ class Client:
                     logger.warning(f'bogus handle value: {attribute_handle}')
                     return []
 
-                descriptor = DescriptorProxy(self, attribute_handle, UUID.from_bytes(attribute_uuid))
+                descriptor = DescriptorProxy(
+                    self, attribute_handle, UUID.from_bytes(attribute_uuid)
+                )
                 descriptors.append(descriptor)
                 # TODO: read descriptor value
 
@@ -515,8 +608,7 @@ class Client:
         while True:
             response = await self.send_request(
                 ATT_Find_Information_Request(
-                    starting_handle = starting_handle,
-                    ending_handle   = ending_handle
+                    starting_handle=starting_handle, ending_handle=ending_handle
                 )
             )
             if response is None:
@@ -526,7 +618,10 @@ class Client:
             if response.op_code == ATT_ERROR_RESPONSE:
                 if response.error_code != ATT_ATTRIBUTE_NOT_FOUND_ERROR:
                     # Unexpected end
-                    logger.warning(f'!!! unexpected error while discovering attributes: {HCI_Constant.error_name(response.error_code)}')
+                    logger.warning(
+                        '!!! unexpected error while discovering attributes: '
+                        f'{HCI_Constant.error_name(response.error_code)}'
+                    )
                     return []
                 break
 
@@ -536,7 +631,9 @@ class Client:
                     logger.warning(f'bogus handle value: {attribute_handle}')
                     return []
 
-                attribute = AttributeProxy(self, attribute_handle, 0, UUID.from_bytes(attribute_uuid))
+                attribute = AttributeProxy(
+                    self, attribute_handle, 0, UUID.from_bytes(attribute_uuid)
+                )
                 attributes.append(attribute)
 
             # Move on to the next attributes
@@ -545,12 +642,15 @@ class Client:
         return attributes
 
     async def subscribe(self, characteristic, subscriber=None, prefer_notify=True):
-        # If we haven't already discovered the descriptors for this characteristic, do it now
+        # If we haven't already discovered the descriptors for this characteristic,
+        # do it now
         if not characteristic.descriptors_discovered:
             await self.discover_descriptors(characteristic)
 
         # Look for the CCCD descriptor
-        cccd = characteristic.get_descriptor(GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR)
+        cccd = characteristic.get_descriptor(
+            GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR
+        )
         if not cccd:
             logger.warning('subscribing to characteristic with no CCCD descriptor')
             return
@@ -578,33 +678,40 @@ class Client:
         subscriber_set = subscribers.setdefault(characteristic.handle, set())
         if subscriber is not None:
             subscriber_set.add(subscriber)
-        # Add the characteristic as a subscriber, which will result in the characteristic
-        # emitting an 'update' event when a notification or indication is received
+        # Add the characteristic as a subscriber, which will result in the
+        # characteristic emitting an 'update' event when a notification or indication
+        # is received
         subscriber_set.add(characteristic)
 
         await self.write_value(cccd, struct.pack('<H', bits), with_response=True)
 
     async def unsubscribe(self, characteristic, subscriber=None):
-        # If we haven't already discovered the descriptors for this characteristic, do it now
+        # If we haven't already discovered the descriptors for this characteristic,
+        # do it now
         if not characteristic.descriptors_discovered:
             await self.discover_descriptors(characteristic)
 
         # Look for the CCCD descriptor
-        cccd = characteristic.get_descriptor(GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR)
+        cccd = characteristic.get_descriptor(
+            GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR
+        )
         if not cccd:
             logger.warning('unsubscribing from characteristic with no CCCD descriptor')
             return
 
         if subscriber is not None:
             # Remove matching subscriber from subscriber sets
-            for subscriber_set in (self.notification_subscribers, self.indication_subscribers):
+            for subscriber_set in (
+                self.notification_subscribers,
+                self.indication_subscribers,
+            ):
                 subscribers = subscriber_set.get(characteristic.handle, [])
                 if subscriber in subscribers:
                     subscribers.remove(subscriber)
 
                     # Cleanup if we removed the last one
                     if not subscribers:
-                        subscriber_set.remove(characteristic.handle)
+                        del subscriber_set[characteristic.handle]
         else:
             # Remove all subscribers for this attribute from the sets!
             self.notification_subscribers.pop(characteristic.handle, None)
@@ -622,8 +729,10 @@ class Client:
         '''
 
         # Send a request to read
-        attribute_handle = attribute if type(attribute) is int else attribute.handle
-        response = await self.send_request(ATT_Read_Request(attribute_handle = attribute_handle))
+        attribute_handle = attribute if isinstance(attribute, int) else attribute.handle
+        response = await self.send_request(
+            ATT_Read_Request(attribute_handle=attribute_handle)
+        )
         if response is None:
             raise TimeoutError('read timeout')
         if response.op_code == ATT_ERROR_RESPONSE:
@@ -631,7 +740,7 @@ class Client:
                 response.error_code,
                 'att',
                 ATT_PDU.error_name(response.error_code),
-                response
+                response,
             )
 
         # If the value is the max size for the MTU, try to read more unless the caller
@@ -642,18 +751,23 @@ class Client:
             offset = len(attribute_value)
             while True:
                 response = await self.send_request(
-                    ATT_Read_Blob_Request(attribute_handle = attribute_handle, value_offset = offset)
+                    ATT_Read_Blob_Request(
+                        attribute_handle=attribute_handle, value_offset=offset
+                    )
                 )
                 if response is None:
                     raise TimeoutError('read timeout')
                 if response.op_code == ATT_ERROR_RESPONSE:
-                    if response.error_code == ATT_ATTRIBUTE_NOT_LONG_ERROR or response.error_code == ATT_INVALID_OFFSET_ERROR:
+                    if response.error_code in (
+                        ATT_ATTRIBUTE_NOT_LONG_ERROR,
+                        ATT_INVALID_OFFSET_ERROR,
+                    ):
                         break
                     raise ProtocolError(
                         response.error_code,
                         'att',
                         ATT_PDU.error_name(response.error_code),
-                        response
+                        response,
                     )
 
                 part = response.part_attribute_value
@@ -685,7 +799,7 @@ class Client:
                 ATT_Read_By_Type_Request(
                     starting_handle=starting_handle,
                     ending_handle=ending_handle,
-                    attribute_type  = uuid
+                    attribute_type=uuid,
                 )
             )
             if response is None:
@@ -696,7 +810,10 @@ class Client:
             if response.op_code == ATT_ERROR_RESPONSE:
                 if response.error_code != ATT_ATTRIBUTE_NOT_FOUND_ERROR:
                     # Unexpected end
-                    logger.warning(f'!!! unexpected error while reading characteristics: {HCI_Constant.error_name(response.error_code)}')
+                    logger.warning(
+                        '!!! unexpected error while reading characteristics: '
+                        f'{HCI_Constant.error_name(response.error_code)}'
+                    )
                     # TODO raise appropriate exception
                     return []
                 break
@@ -721,47 +838,54 @@ class Client:
 
     async def write_value(self, attribute, value, with_response=False):
         '''
-        See Vol 3, Part G - 4.9.1 Write Without Response & 4.9.3 Write Characteristic Value
+        See Vol 3, Part G - 4.9.1 Write Without Response & 4.9.3 Write Characteristic
+        Value
 
         `attribute` can be an Attribute object, or a handle value
         '''
 
         # Send a request or command to write
-        attribute_handle = attribute if type(attribute) is int else attribute.handle
+        attribute_handle = attribute if isinstance(attribute, int) else attribute.handle
         if with_response:
             response = await self.send_request(
                 ATT_Write_Request(
-                    attribute_handle = attribute_handle,
-                    attribute_value  = value
+                    attribute_handle=attribute_handle, attribute_value=value
                 )
             )
             if response.op_code == ATT_ERROR_RESPONSE:
                 raise ProtocolError(
                     response.error_code,
                     'att',
-                    ATT_PDU.error_name(response.error_code), response
+                    ATT_PDU.error_name(response.error_code),
+                    response,
                 )
         else:
             await self.send_command(
                 ATT_Write_Command(
-                    attribute_handle = attribute_handle,
-                    attribute_value  = value
+                    attribute_handle=attribute_handle, attribute_value=value
                 )
             )
 
     def on_gatt_pdu(self, att_pdu):
-        logger.debug(f'GATT Response to client: [0x{self.connection.handle:04X}] {att_pdu}')
+        logger.debug(
+            f'GATT Response to client: [0x{self.connection.handle:04X}] {att_pdu}'
+        )
         if att_pdu.op_code in ATT_RESPONSES:
             if self.pending_request is None:
                 # Not expected!
                 logger.warning('!!! unexpected response, there is no pending request')
                 return
 
-            # Sanity check: the response should match the pending request unless it is an error response
+            # Sanity check: the response should match the pending request unless it is
+            # an error response
             if att_pdu.op_code != ATT_ERROR_RESPONSE:
-                expected_response_name = self.pending_request.name.replace('_REQUEST', '_RESPONSE')
+                expected_response_name = self.pending_request.name.replace(
+                    '_REQUEST', '_RESPONSE'
+                )
                 if att_pdu.name != expected_response_name:
-                    logger.warning(f'!!! mismatched response: expected {expected_response_name}')
+                    logger.warning(
+                        f'!!! mismatched response: expected {expected_response_name}'
+                    )
                     return
 
             # Return the response to the coroutine that is waiting for it
@@ -772,11 +896,20 @@ class Client:
             if handler is not None:
                 handler(att_pdu)
             else:
-                logger.warning(f'{color(f"--- Ignoring GATT Response from [0x{self.connection.handle:04X}]:", "red")} {att_pdu}')
+                logger.warning(
+                    color(
+                        '--- Ignoring GATT Response from '
+                        f'[0x{self.connection.handle:04X}]: ',
+                        'red',
+                    )
+                    + str(att_pdu)
+                )
 
     def on_att_handle_value_notification(self, notification):
         # Call all subscribers
-        subscribers = self.notification_subscribers.get(notification.attribute_handle, [])
+        subscribers = self.notification_subscribers.get(
+            notification.attribute_handle, []
+        )
         if not subscribers:
             logger.warning('!!! received notification with no subscriber')
         for subscriber in subscribers:

bumble/gatt_server.py

@@ -26,13 +26,53 @@
 import asyncio
 import logging
 from collections import defaultdict
+import struct
+from typing import Tuple, Optional
 from pyee import EventEmitter
 from colors import color
 
-from .core import *
-from .hci import *
-from .att import *
-from .gatt import *
+from .core import UUID
+from .att import (
+    ATT_ATTRIBUTE_NOT_FOUND_ERROR,
+    ATT_ATTRIBUTE_NOT_LONG_ERROR,
+    ATT_CID,
+    ATT_DEFAULT_MTU,
+    ATT_INVALID_ATTRIBUTE_LENGTH_ERROR,
+    ATT_INVALID_HANDLE_ERROR,
+    ATT_INVALID_OFFSET_ERROR,
+    ATT_REQUEST_NOT_SUPPORTED_ERROR,
+    ATT_REQUESTS,
+    ATT_UNLIKELY_ERROR_ERROR,
+    ATT_UNSUPPORTED_GROUP_TYPE_ERROR,
+    ATT_Error,
+    ATT_Error_Response,
+    ATT_Exchange_MTU_Response,
+    ATT_Find_By_Type_Value_Response,
+    ATT_Find_Information_Response,
+    ATT_Handle_Value_Indication,
+    ATT_Handle_Value_Notification,
+    ATT_Read_Blob_Response,
+    ATT_Read_By_Group_Type_Response,
+    ATT_Read_By_Type_Response,
+    ATT_Read_Response,
+    ATT_Write_Response,
+    Attribute,
+)
+from .gatt import (
+    GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
+    GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR,
+    GATT_INCLUDE_ATTRIBUTE_TYPE,
+    GATT_MAX_ATTRIBUTE_VALUE_SIZE,
+    GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
+    GATT_REQUEST_TIMEOUT,
+    GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
+    Characteristic,
+    CharacteristicDeclaration,
+    CharacteristicValue,
+    Descriptor,
+    Service,
+)
+
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -55,17 +95,32 @@ class Server(EventEmitter):
         self.device = device
         self.attributes = []  # Attributes, ordered by increasing handle values
         self.attributes_by_handle = {}  # Map for fast attribute access by handle
-        self.max_mtu               = GATT_SERVER_DEFAULT_MAX_MTU  # The max MTU we're willing to negotiate
-        self.subscribers           = {}  # Map of subscriber states by connection handle and attribute handle
+        self.max_mtu = (
+            GATT_SERVER_DEFAULT_MAX_MTU  # The max MTU we're willing to negotiate
+        )
+        self.subscribers = (
+            {}
+        )  # Map of subscriber states by connection handle and attribute handle
         self.indication_semaphores = defaultdict(lambda: asyncio.Semaphore(1))
         self.pending_confirmations = defaultdict(lambda: None)
 
+    def __str__(self):
+        return "\n".join(map(str, self.attributes))
+
     def send_gatt_pdu(self, connection_handle, pdu):
         self.device.send_l2cap_pdu(connection_handle, ATT_CID, pdu)
 
     def next_handle(self):
         return 1 + len(self.attributes)
 
+    def get_advertising_service_data(self):
+        return {
+            attribute: data
+            for attribute in self.attributes
+            if isinstance(attribute, Service)
+            and (data := attribute.get_advertising_data())
+        }
+
     def get_attribute(self, handle):
         attribute = self.attributes_by_handle.get(handle)
         if attribute:
@@ -79,15 +134,74 @@ class Server(EventEmitter):
                 return attribute
         return None
 
+    def get_service_attribute(self, service_uuid: UUID) -> Optional[Service]:
+        return next(
+            (
+                attribute
+                for attribute in self.attributes
+                if attribute.type == GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE
+                and attribute.uuid == service_uuid
+            ),
+            None,
+        )
+
+    def get_characteristic_attributes(
+        self, service_uuid: UUID, characteristic_uuid: UUID
+    ) -> Optional[Tuple[CharacteristicDeclaration, Characteristic]]:
+        service_handle = self.get_service_attribute(service_uuid)
+        if not service_handle:
+            return None
+
+        return next(
+            (
+                (attribute, self.get_attribute(attribute.characteristic.handle))
+                for attribute in map(
+                    self.get_attribute,
+                    range(service_handle.handle, service_handle.end_group_handle + 1),
+                )
+                if attribute.type == GATT_CHARACTERISTIC_ATTRIBUTE_TYPE
+                and attribute.characteristic.uuid == characteristic_uuid
+            ),
+            None,
+        )
+
+    def get_descriptor_attribute(
+        self, service_uuid: UUID, characteristic_uuid: UUID, descriptor_uuid: UUID
+    ) -> Optional[Descriptor]:
+        characteristics = self.get_characteristic_attributes(
+            service_uuid, characteristic_uuid
+        )
+        if not characteristics:
+            return None
+
+        (_, characteristic_value) = characteristics
+
+        return next(
+            (
+                attribute
+                for attribute in map(
+                    self.get_attribute,
+                    range(
+                        characteristic_value.handle + 1,
+                        characteristic_value.end_group_handle + 1,
+                    ),
+                )
+                if attribute.type == descriptor_uuid
+            ),
+            None,
+        )
+
     def add_attribute(self, attribute):
         # Assign a handle to this attribute
         attribute.handle = self.next_handle()
-        attribute.end_group_handle = attribute.handle  # TODO: keep track of descriptors in the group
+        attribute.end_group_handle = (
+            attribute.handle
+        )  # TODO: keep track of descriptors in the group
 
         # Add this attribute to the list
         self.attributes.append(attribute)
 
-    def add_service(self, service):
+    def add_service(self, service: Service):
         # Add the service attribute to the DB
         self.add_attribute(service)
 
@@ -95,16 +209,9 @@ class Server(EventEmitter):
 
         # Add all characteristics
         for characteristic in service.characteristics:
-            # Add a Characteristic Declaration (Vol 3, Part G - 3.3.1 Characteristic Declaration)
-            declaration_bytes = struct.pack(
-                '<BH',
-                characteristic.properties,
-                self.next_handle() + 1,  # The value will be the next attribute after this declaration
-            ) + characteristic.uuid.to_pdu_bytes()
-            characteristic_declaration = Attribute(
-                GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
-                Attribute.READABLE,
-                declaration_bytes
+            # Add a Characteristic Declaration
+            characteristic_declaration = CharacteristicDeclaration(
+                characteristic, self.next_handle() + 1
             )
             self.add_attribute(characteristic_declaration)
 
@@ -118,17 +225,26 @@ class Server(EventEmitter):
             # If the characteristic supports subscriptions, add a CCCD descriptor
             # unless there is one already
             if (
-                characteristic.properties & (Characteristic.NOTIFY | Characteristic.INDICATE) and
-                characteristic.get_descriptor(GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR) is None
+                characteristic.properties
+                & (Characteristic.NOTIFY | Characteristic.INDICATE)
+                and characteristic.get_descriptor(
+                    GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR
+                )
+                is None
             ):
                 self.add_attribute(
+                    # pylint: disable=line-too-long
                     Descriptor(
                         GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR,
                         Attribute.READABLE | Attribute.WRITEABLE,
                         CharacteristicValue(
-                            read=lambda connection, characteristic=characteristic: self.read_cccd(connection, characteristic),
-                            write=lambda connection, value, characteristic=characteristic: self.write_cccd(connection, characteristic, value)
-                        )
+                            read=lambda connection, characteristic=characteristic: self.read_cccd(
+                                connection, characteristic
+                            ),
+                            write=lambda connection, value, characteristic=characteristic: self.write_cccd(
+                                connection, characteristic, value
+                            ),
+                        ),
                     )
                 )
 
@@ -155,23 +271,36 @@ class Server(EventEmitter):
         return cccd or bytes([0, 0])
 
     def write_cccd(self, connection, characteristic, value):
-        logger.debug(f'Subscription update for connection=0x{connection.handle:04X}, handle=0x{characteristic.handle:04X}: {value.hex()}')
+        logger.debug(
+            f'Subscription update for connection=0x{connection.handle:04X}, '
+            f'handle=0x{characteristic.handle:04X}: {value.hex()}'
+        )
 
         # Sanity check
         if len(value) != 2:
-            logger.warn('CCCD value not 2 bytes long')
+            logger.warning('CCCD value not 2 bytes long')
             return
 
         cccds = self.subscribers.setdefault(connection.handle, {})
         cccds[characteristic.handle] = value
         logger.debug(f'CCCDs: {cccds}')
-        notify_enabled = (value[0] & 0x01 != 0)
-        indicate_enabled = (value[0] & 0x02 != 0)
-        characteristic.emit('subscription', connection, notify_enabled, indicate_enabled)
-        self.emit('characteristic_subscription', connection, characteristic, notify_enabled, indicate_enabled)
+        notify_enabled = value[0] & 0x01 != 0
+        indicate_enabled = value[0] & 0x02 != 0
+        characteristic.emit(
+            'subscription', connection, notify_enabled, indicate_enabled
+        )
+        self.emit(
+            'characteristic_subscription',
+            connection,
+            characteristic,
+            notify_enabled,
+            indicate_enabled,
+        )
 
     def send_response(self, connection, response):
-        logger.debug(f'GATT Response from server: [0x{connection.handle:04X}] {response}')
+        logger.debug(
+            f'GATT Response from server: [0x{connection.handle:04X}] {response}'
+        )
         self.send_gatt_pdu(connection.handle, response.to_bytes())
 
     async def notify_subscriber(self, connection, attribute, value=None, force=False):
@@ -183,14 +312,20 @@ class Server(EventEmitter):
                 return
             cccd = subscribers.get(attribute.handle)
             if not cccd:
-                logger.debug(f'not notifying, no subscribers for handle {attribute.handle:04X}')
+                logger.debug(
+                    f'not notifying, no subscribers for handle {attribute.handle:04X}'
+                )
                 return
             if len(cccd) != 2 or (cccd[0] & 0x01 == 0):
                 logger.debug(f'not notifying, cccd={cccd.hex()}')
                 return
 
         # Get or encode the value
-        value = attribute.read_value(connection) if value is None else attribute.encode_value(value)
+        value = (
+            attribute.read_value(connection)
+            if value is None
+            else attribute.encode_value(value)
+        )
 
         # Truncate if needed
         if len(value) > connection.att_mtu - 3:
@@ -198,10 +333,11 @@ class Server(EventEmitter):
 
         # Notify
         notification = ATT_Handle_Value_Notification(
-            attribute_handle = attribute.handle,
-            attribute_value  = value
+            attribute_handle=attribute.handle, attribute_value=value
+        )
+        logger.debug(
+            f'GATT Notify from server: [0x{connection.handle:04X}] {notification}'
         )
-        logger.debug(f'GATT Notify from server: [0x{connection.handle:04X}] {notification}')
         self.send_gatt_pdu(connection.handle, bytes(notification))
 
     async def indicate_subscriber(self, connection, attribute, value=None, force=False):
@@ -213,14 +349,20 @@ class Server(EventEmitter):
                 return
             cccd = subscribers.get(attribute.handle)
             if not cccd:
-                logger.debug(f'not indicating, no subscribers for handle {attribute.handle:04X}')
+                logger.debug(
+                    f'not indicating, no subscribers for handle {attribute.handle:04X}'
+                )
                 return
             if len(cccd) != 2 or (cccd[0] & 0x02 == 0):
                 logger.debug(f'not indicating, cccd={cccd.hex()}')
                 return
 
         # Get or encode the value
-        value = attribute.read_value(connection) if value is None else attribute.encode_value(value)
+        value = (
+            attribute.read_value(connection)
+            if value is None
+            else attribute.encode_value(value)
+        )
 
         # Truncate if needed
         if len(value) > connection.att_mtu - 3:
@@ -228,31 +370,39 @@ class Server(EventEmitter):
 
         # Indicate
         indication = ATT_Handle_Value_Indication(
-            attribute_handle = attribute.handle,
-            attribute_value  = value
+            attribute_handle=attribute.handle, attribute_value=value
+        )
+        logger.debug(
+            f'GATT Indicate from server: [0x{connection.handle:04X}] {indication}'
         )
-        logger.debug(f'GATT Indicate from server: [0x{connection.handle:04X}] {indication}')
 
         # Wait until we can send (only one pending indication at a time per connection)
         async with self.indication_semaphores[connection.handle]:
-            assert(self.pending_confirmations[connection.handle] is None)
+            assert self.pending_confirmations[connection.handle] is None
 
             # Create a future value to hold the eventual response
-            self.pending_confirmations[connection.handle] = asyncio.get_running_loop().create_future()
+            self.pending_confirmations[
+                connection.handle
+            ] = asyncio.get_running_loop().create_future()
 
             try:
                 self.send_gatt_pdu(connection.handle, indication.to_bytes())
-                await asyncio.wait_for(self.pending_confirmations[connection.handle], GATT_REQUEST_TIMEOUT)
-            except asyncio.TimeoutError:
+                await asyncio.wait_for(
+                    self.pending_confirmations[connection.handle], GATT_REQUEST_TIMEOUT
+                )
+            except asyncio.TimeoutError as error:
                 logger.warning(color('!!! GATT Indicate timeout', 'red'))
-                raise TimeoutError(f'GATT timeout for {indication.name}')
+                raise TimeoutError(f'GATT timeout for {indication.name}') from error
             finally:
                 self.pending_confirmations[connection.handle] = None
 
-    async def notify_or_indicate_subscribers(self, indicate, attribute, value=None, force=False):
+    async def notify_or_indicate_subscribers(
+        self, indicate, attribute, value=None, force=False
+    ):
         # Get all the connections for which there's at least one subscription
         connections = [
-            connection for connection in [
+            connection
+            for connection in [
                 self.device.lookup_connection(connection_handle)
                 for (connection_handle, subscribers) in self.subscribers.items()
                 if force or subscribers.get(attribute.handle)
@@ -263,10 +413,12 @@ class Server(EventEmitter):
         # Indicate or notify for each connection
         if connections:
             coroutine = self.indicate_subscriber if indicate else self.notify_subscriber
-            await asyncio.wait([
+            await asyncio.wait(
+                [
                     asyncio.create_task(coroutine(connection, attribute, value, force))
                     for connection in connections
-            ])
+                ]
+            )
 
     async def notify_subscribers(self, attribute, value=None, force=False):
         return await self.notify_or_indicate_subscribers(False, attribute, value, force)
@@ -294,7 +446,7 @@ class Server(EventEmitter):
                 response = ATT_Error_Response(
                     request_opcode_in_error=att_pdu.op_code,
                     attribute_handle_in_error=error.att_handle,
-                    error_code                = error.error_code
+                    error_code=error.error_code,
                 )
                 self.send_response(connection, response)
             except Exception as error:
@@ -302,7 +454,7 @@ class Server(EventEmitter):
                 response = ATT_Error_Response(
                     request_opcode_in_error=att_pdu.op_code,
                     attribute_handle_in_error=0x0000,
-                    error_code                = ATT_UNLIKELY_ERROR_ERROR
+                    error_code=ATT_UNLIKELY_ERROR_ERROR,
                 )
                 self.send_response(connection, response)
                 raise error
@@ -313,7 +465,13 @@ class Server(EventEmitter):
                 self.on_att_request(connection, att_pdu)
             else:
                 # Just ignore
-                logger.warning(f'{color("--- Ignoring GATT Request from [0x{connection.handle:04X}]:", "red")}  {att_pdu}')
+                logger.warning(
+                    color(
+                        f'--- Ignoring GATT Request from [0x{connection.handle:04X}]: ',
+                        'red',
+                    )
+                    + str(att_pdu)
+                )
 
     #######################################################
     # ATT handlers
@@ -322,11 +480,16 @@ class Server(EventEmitter):
         '''
         Handler for requests without a more specific handler
         '''
-        logger.warning(f'{color(f"--- Unsupported ATT Request from [0x{connection.handle:04X}]:", "red")} {pdu}')
+        logger.warning(
+            color(
+                f'--- Unsupported ATT Request from [0x{connection.handle:04X}]: ', 'red'
+            )
+            + str(pdu)
+        )
         response = ATT_Error_Response(
             request_opcode_in_error=pdu.op_code,
             attribute_handle_in_error=0x0000,
-            error_code                = ATT_REQUEST_NOT_SUPPORTED_ERROR
+            error_code=ATT_REQUEST_NOT_SUPPORTED_ERROR,
         )
         self.send_response(connection, response)
 
@@ -334,7 +497,9 @@ class Server(EventEmitter):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.2.1 Exchange MTU Request
         '''
-        self.send_response(connection, ATT_Exchange_MTU_Response(server_rx_mtu = self.max_mtu))
+        self.send_response(
+            connection, ATT_Exchange_MTU_Response(server_rx_mtu=self.max_mtu)
+        )
 
         # Compute the final MTU
         if request.client_rx_mtu >= ATT_DEFAULT_MTU:
@@ -351,12 +516,18 @@ class Server(EventEmitter):
         '''
 
         # Check the request parameters
-        if request.starting_handle == 0 or request.starting_handle > request.ending_handle:
-            self.send_response(connection, ATT_Error_Response(
+        if (
+            request.starting_handle == 0
+            or request.starting_handle > request.ending_handle
+        ):
+            self.send_response(
+                connection,
+                ATT_Error_Response(
                     request_opcode_in_error=request.op_code,
                     attribute_handle_in_error=request.starting_handle,
-                error_code                = ATT_INVALID_HANDLE_ERROR
-            ))
+                    error_code=ATT_INVALID_HANDLE_ERROR,
+                ),
+            )
             return
 
         # Build list of returned attributes
@@ -364,9 +535,10 @@ class Server(EventEmitter):
         attributes = []
         uuid_size = 0
         for attribute in (
-            attribute for attribute in self.attributes if
-            attribute.handle >= request.starting_handle and
-            attribute.handle <= request.ending_handle
+            attribute
+            for attribute in self.attributes
+            if attribute.handle >= request.starting_handle
+            and attribute.handle <= request.ending_handle
         ):
             # TODO: check permissions
 
@@ -394,13 +566,13 @@ class Server(EventEmitter):
             ]
             response = ATT_Find_Information_Response(
                 format=1 if len(attributes[0].type.to_pdu_bytes()) == 2 else 2,
-                information_data = b''.join(information_data_list)
+                information_data=b''.join(information_data_list),
             )
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.starting_handle,
-                error_code                = ATT_ATTRIBUTE_NOT_FOUND_ERROR
+                error_code=ATT_ATTRIBUTE_NOT_FOUND_ERROR,
             )
 
         self.send_response(connection, response)
@@ -414,12 +586,13 @@ class Server(EventEmitter):
         pdu_space_available = connection.att_mtu - 2
         attributes = []
         for attribute in (
-            attribute for attribute in self.attributes if
-            attribute.handle                 >= request.starting_handle and
-            attribute.handle                 <= request.ending_handle   and
-            attribute.type                   == request.attribute_type  and
-            attribute.read_value(connection) == request.attribute_value and
-            pdu_space_available >= 4
+            attribute
+            for attribute in self.attributes
+            if attribute.handle >= request.starting_handle
+            and attribute.handle <= request.ending_handle
+            and attribute.type == request.attribute_type
+            and attribute.read_value(connection) == request.attribute_value
+            and pdu_space_available >= 4
         ):
             # TODO: check permissions
 
@@ -431,17 +604,19 @@ class Server(EventEmitter):
         if attributes:
             handles_information_list = []
             for attribute in attributes:
-                if attribute.type in {
+                if attribute.type in (
                     GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
                     GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
-                    GATT_CHARACTERISTIC_ATTRIBUTE_TYPE
-                }:
+                    GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
+                ):
                     # Part of a group
                     group_end_handle = attribute.end_group_handle
                 else:
                     # Not part of a group
                     group_end_handle = attribute.handle
-                handles_information_list.append(struct.pack('<HH', attribute.handle, group_end_handle))
+                handles_information_list.append(
+                    struct.pack('<HH', attribute.handle, group_end_handle)
+                )
             response = ATT_Find_By_Type_Value_Response(
                 handles_information_list=b''.join(handles_information_list)
             )
@@ -449,7 +624,7 @@ class Server(EventEmitter):
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.starting_handle,
-                error_code                = ATT_ATTRIBUTE_NOT_FOUND_ERROR
+                error_code=ATT_ATTRIBUTE_NOT_FOUND_ERROR,
             )
 
         self.send_response(connection, response)
@@ -462,11 +637,12 @@ class Server(EventEmitter):
         pdu_space_available = connection.att_mtu - 2
         attributes = []
         for attribute in (
-            attribute for attribute in self.attributes if
-            attribute.type   == request.attribute_type  and
-            attribute.handle >= request.starting_handle and
-            attribute.handle <= request.ending_handle   and
-            pdu_space_available
+            attribute
+            for attribute in self.attributes
+            if attribute.type == request.attribute_type
+            and attribute.handle >= request.starting_handle
+            and attribute.handle <= request.ending_handle
+            and pdu_space_available
         ):
             # TODO: check permissions
 
@@ -490,16 +666,17 @@ class Server(EventEmitter):
             pdu_space_available -= entry_size
 
         if attributes:
-            attribute_data_list = [struct.pack('<H', handle) + value for handle, value in attributes]
+            attribute_data_list = [
+                struct.pack('<H', handle) + value for handle, value in attributes
+            ]
             response = ATT_Read_By_Type_Response(
-                length              = entry_size,
-                attribute_data_list = b''.join(attribute_data_list)
+                length=entry_size, attribute_data_list=b''.join(attribute_data_list)
             )
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.starting_handle,
-                error_code                = ATT_ATTRIBUTE_NOT_FOUND_ERROR
+                error_code=ATT_ATTRIBUTE_NOT_FOUND_ERROR,
             )
 
         self.send_response(connection, response)
@@ -513,14 +690,12 @@ class Server(EventEmitter):
             # TODO: check permissions
             value = attribute.read_value(connection)
             value_size = min(connection.att_mtu - 1, len(value))
-            response = ATT_Read_Response(
-                attribute_value = value[:value_size]
-            )
+            response = ATT_Read_Response(attribute_value=value[:value_size])
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.attribute_handle,
-                error_code                = ATT_INVALID_HANDLE_ERROR
+                error_code=ATT_INVALID_HANDLE_ERROR,
             )
         self.send_response(connection, response)
 
@@ -536,24 +711,28 @@ class Server(EventEmitter):
                 response = ATT_Error_Response(
                     request_opcode_in_error=request.op_code,
                     attribute_handle_in_error=request.attribute_handle,
-                    error_code                = ATT_INVALID_OFFSET_ERROR
+                    error_code=ATT_INVALID_OFFSET_ERROR,
                 )
             elif len(value) <= connection.att_mtu - 1:
                 response = ATT_Error_Response(
                     request_opcode_in_error=request.op_code,
                     attribute_handle_in_error=request.attribute_handle,
-                    error_code                = ATT_ATTRIBUTE_NOT_LONG_ERROR
+                    error_code=ATT_ATTRIBUTE_NOT_LONG_ERROR,
                 )
             else:
-                part_size = min(connection.att_mtu - 1, len(value) - request.value_offset)
+                part_size = min(
+                    connection.att_mtu - 1, len(value) - request.value_offset
+                )
                 response = ATT_Read_Blob_Response(
-                    part_attribute_value = value[request.value_offset:request.value_offset + part_size]
+                    part_attribute_value=value[
+                        request.value_offset : request.value_offset + part_size
+                    ]
                 )
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.attribute_handle,
-                error_code                = ATT_INVALID_HANDLE_ERROR
+                error_code=ATT_INVALID_HANDLE_ERROR,
             )
         self.send_response(connection, response)
 
@@ -561,15 +740,15 @@ class Server(EventEmitter):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.4.9 Read by Group Type Request
         '''
-        if request.attribute_group_type not in {
+        if request.attribute_group_type not in (
             GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
             GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
-            GATT_INCLUDE_ATTRIBUTE_TYPE
-        }:
+            GATT_INCLUDE_ATTRIBUTE_TYPE,
+        ):
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.starting_handle,
-                error_code                = ATT_UNSUPPORTED_GROUP_TYPE_ERROR
+                error_code=ATT_UNSUPPORTED_GROUP_TYPE_ERROR,
             )
             self.send_response(connection, response)
             return
@@ -577,11 +756,12 @@ class Server(EventEmitter):
         pdu_space_available = connection.att_mtu - 2
         attributes = []
         for attribute in (
-            attribute for attribute in self.attributes if
-            attribute.type   == request.attribute_group_type and
-            attribute.handle >= request.starting_handle      and
-            attribute.handle <= request.ending_handle        and
-            pdu_space_available
+            attribute
+            for attribute in self.attributes
+            if attribute.type == request.attribute_group_type
+            and attribute.handle >= request.starting_handle
+            and attribute.handle <= request.ending_handle
+            and pdu_space_available
         ):
             # Check the attribute value size
             attribute_value = attribute.read_value(connection)
@@ -599,7 +779,9 @@ class Server(EventEmitter):
                 break
 
             # Add the attribute to the list
-            attributes.append((attribute.handle, attribute.end_group_handle, attribute_value))
+            attributes.append(
+                (attribute.handle, attribute.end_group_handle, attribute_value)
+            )
             pdu_space_available -= entry_size
 
         if attributes:
@@ -609,13 +791,13 @@ class Server(EventEmitter):
             ]
             response = ATT_Read_By_Group_Type_Response(
                 length=len(attribute_data_list[0]),
-                attribute_data_list = b''.join(attribute_data_list)
+                attribute_data_list=b''.join(attribute_data_list),
             )
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
                 attribute_handle_in_error=request.starting_handle,
-                error_code                = ATT_ATTRIBUTE_NOT_FOUND_ERROR
+                error_code=ATT_ATTRIBUTE_NOT_FOUND_ERROR,
             )
 
         self.send_response(connection, response)
@@ -628,22 +810,28 @@ class Server(EventEmitter):
         # Check  that the attribute exists
         attribute = self.get_attribute(request.attribute_handle)
         if attribute is None:
-            self.send_response(connection, ATT_Error_Response(
+            self.send_response(
+                connection,
+                ATT_Error_Response(
                     request_opcode_in_error=request.op_code,
                     attribute_handle_in_error=request.attribute_handle,
-                error_code                = ATT_INVALID_HANDLE_ERROR
-            ))
+                    error_code=ATT_INVALID_HANDLE_ERROR,
+                ),
+            )
             return
 
         # TODO: check permissions
 
         # Check the request parameters
         if len(request.attribute_value) > GATT_MAX_ATTRIBUTE_VALUE_SIZE:
-            self.send_response(connection, ATT_Error_Response(
+            self.send_response(
+                connection,
+                ATT_Error_Response(
                     request_opcode_in_error=request.op_code,
                     attribute_handle_in_error=request.attribute_handle,
-                error_code                = ATT_INVALID_ATTRIBUTE_LENGTH_ERROR
-            ))
+                    error_code=ATT_INVALID_ATTRIBUTE_LENGTH_ERROR,
+                ),
+            )
             return
 
         # Accept the value
@@ -674,13 +862,15 @@ class Server(EventEmitter):
         except Exception as error:
             logger.warning(f'!!! ignoring exception: {error}')
 
-    def on_att_handle_value_confirmation(self, connection, confirmation):
+    def on_att_handle_value_confirmation(self, connection, _confirmation):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.7.3 Handle Value Confirmation
         '''
         if self.pending_confirmations[connection.handle] is None:
             # Not expected!
-            logger.warning('!!! unexpected confirmation, there is no pending indication')
+            logger.warning(
+                '!!! unexpected confirmation, there is no pending indication'
+            )
             return
 
         self.pending_confirmations[connection.handle].set_result(None)

bumble/helpers.py

@@ -18,10 +18,9 @@
 import logging
 from colors import color
 
-from bumble.smp import SMP_CID, SMP_Command
-
+from .att import ATT_CID, ATT_PDU
+from .smp import SMP_CID, SMP_Command
 from .core import name_or_number
-from .gatt import ATT_PDU, ATT_CID
 from .l2cap import (
     L2CAP_PDU,
     L2CAP_CONNECTION_REQUEST,
@@ -29,20 +28,17 @@ from .l2cap import (
     L2CAP_SIGNALING_CID,
     L2CAP_LE_SIGNALING_CID,
     L2CAP_Control_Frame,
-    L2CAP_Connection_Response
+    L2CAP_Connection_Response,
 )
 from .hci import (
     HCI_EVENT_PACKET,
     HCI_ACL_DATA_PACKET,
     HCI_DISCONNECTION_COMPLETE_EVENT,
-    HCI_AclDataPacketAssembler
+    HCI_AclDataPacketAssembler,
 )
 from .rfcomm import RFCOMM_Frame, RFCOMM_PSM
 from .sdp import SDP_PDU, SDP_PSM
-from .avdtp import (
-    MessageAssembler as AVDTP_MessageAssembler,
-    AVDTP_PSM
-)
+from .avdtp import MessageAssembler as AVDTP_MessageAssembler, AVDTP_PSM
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -69,6 +65,7 @@ class PacketTracer:
             self.psms = {}  # PSM, by source_cid
             self.peer = None  # ACL stream in the other direction
 
+        # pylint: disable=too-many-nested-blocks
         def on_acl_pdu(self, pdu):
             l2cap_pdu = L2CAP_PDU.from_bytes(pdu)
 
@@ -78,7 +75,7 @@ class PacketTracer:
             elif l2cap_pdu.cid == SMP_CID:
                 smp_command = SMP_Command.from_bytes(l2cap_pdu.payload)
                 self.analyzer.emit(smp_command)
-            elif l2cap_pdu.cid == L2CAP_SIGNALING_CID or l2cap_pdu.cid == L2CAP_LE_SIGNALING_CID:
+            elif l2cap_pdu.cid in (L2CAP_SIGNALING_CID, L2CAP_LE_SIGNALING_CID):
                 control_frame = L2CAP_Control_Frame.from_bytes(l2cap_pdu.payload)
                 self.analyzer.emit(control_frame)
 
@@ -86,16 +83,26 @@ class PacketTracer:
                 if control_frame.code == L2CAP_CONNECTION_REQUEST:
                     self.psms[control_frame.source_cid] = control_frame.psm
                 elif control_frame.code == L2CAP_CONNECTION_RESPONSE:
-                    if control_frame.result == L2CAP_Connection_Response.CONNECTION_SUCCESSFUL:
+                    if (
+                        control_frame.result
+                        == L2CAP_Connection_Response.CONNECTION_SUCCESSFUL
+                    ):
                         if self.peer:
                             if psm := self.peer.psms.get(control_frame.source_cid):
                                 # Found a pending connection
                                 self.psms[control_frame.destination_cid] = psm
 
-                                # For AVDTP connections, create a packet assembler for each direction
+                                # For AVDTP connections, create a packet assembler for
+                                # each direction
                                 if psm == AVDTP_PSM:
-                                    self.avdtp_assemblers[control_frame.source_cid] = AVDTP_MessageAssembler(self.on_avdtp_message)
-                                    self.peer.avdtp_assemblers[control_frame.destination_cid] = AVDTP_MessageAssembler(self.peer.on_avdtp_message)
+                                    self.avdtp_assemblers[
+                                        control_frame.source_cid
+                                    ] = AVDTP_MessageAssembler(self.on_avdtp_message)
+                                    self.peer.avdtp_assemblers[
+                                        control_frame.destination_cid
+                                    ] = AVDTP_MessageAssembler(
+                                        self.peer.on_avdtp_message
+                                    )
 
             else:
                 # Try to find the PSM associated with this PDU
@@ -107,18 +114,26 @@ class PacketTracer:
                         rfcomm_frame = RFCOMM_Frame.from_bytes(l2cap_pdu.payload)
                         self.analyzer.emit(rfcomm_frame)
                     elif psm == AVDTP_PSM:
-                        self.analyzer.emit(f'{color("L2CAP", "green")} [CID={l2cap_pdu.cid}, PSM=AVDTP]: {l2cap_pdu.payload.hex()}')
+                        self.analyzer.emit(
+                            f'{color("L2CAP", "green")} [CID={l2cap_pdu.cid}, '
+                            f'PSM=AVDTP]: {l2cap_pdu.payload.hex()}'
+                        )
                         assembler = self.avdtp_assemblers.get(l2cap_pdu.cid)
                         if assembler:
                             assembler.on_pdu(l2cap_pdu.payload)
                     else:
                         psm_string = name_or_number(PSM_NAMES, psm)
-                        self.analyzer.emit(f'{color("L2CAP", "green")} [CID={l2cap_pdu.cid}, PSM={psm_string}]: {l2cap_pdu.payload.hex()}')
+                        self.analyzer.emit(
+                            f'{color("L2CAP", "green")} [CID={l2cap_pdu.cid}, '
+                            f'PSM={psm_string}]: {l2cap_pdu.payload.hex()}'
+                        )
                 else:
                     self.analyzer.emit(l2cap_pdu)
 
         def on_avdtp_message(self, transaction_label, message):
-            self.analyzer.emit(f'{color("AVDTP", "green")} [{transaction_label}] {message}')
+            self.analyzer.emit(
+                f'{color("AVDTP", "green")} [{transaction_label}] {message}'
+            )
 
         def feed_packet(self, packet):
             self.packet_assembler.feed_packet(packet)
@@ -131,7 +146,10 @@ class PacketTracer:
             self.peer = None  # Analyzer in the other direction
 
         def start_acl_stream(self, connection_handle):
-            logger.info(f'[{self.label}] +++ Creating ACL stream for connection 0x{connection_handle:04X}')
+            logger.info(
+                f'[{self.label}] +++ Creating ACL stream for connection '
+                f'0x{connection_handle:04X}'
+            )
             stream = PacketTracer.AclStream(self)
             self.acl_streams[connection_handle] = stream
 
@@ -144,7 +162,10 @@ class PacketTracer:
 
         def end_acl_stream(self, connection_handle):
             if connection_handle in self.acl_streams:
-                logger.info(f'[{self.label}] --- Removing ACL stream for connection 0x{connection_handle:04X}')
+                logger.info(
+                    f'[{self.label}] --- Removing ACL stream for connection '
+                    f'0x{connection_handle:04X}'
+                )
                 del self.acl_streams[connection_handle]
 
                 # Let the other forwarder know so it can cleanup its stream as well
@@ -176,9 +197,13 @@ class PacketTracer:
         self,
         host_to_controller_label=color('HOST->CONTROLLER', 'blue'),
         controller_to_host_label=color('CONTROLLER->HOST', 'cyan'),
-        emit_message=logger.info
+        emit_message=logger.info,
     ):
-        self.host_to_controller_analyzer = PacketTracer.Analyzer(host_to_controller_label, emit_message)
-        self.controller_to_host_analyzer = PacketTracer.Analyzer(controller_to_host_label, emit_message)
+        self.host_to_controller_analyzer = PacketTracer.Analyzer(
+            host_to_controller_label, emit_message
+        )
+        self.controller_to_host_analyzer = PacketTracer.Analyzer(
+            controller_to_host_label, emit_message
+        )
         self.host_to_controller_analyzer.peer = self.controller_to_host_analyzer
         self.controller_to_host_analyzer.peer = self.host_to_controller_analyzer

bumble/hfp.py

@@ -43,7 +43,7 @@ class HfpProtocol:
 
     def feed(self, data):
         # Convert the data to a string if needed
-        if type(data) == bytes:
+        if isinstance(data, bytes):
             data = data.decode('utf-8')
 
         logger.debug(f'<<< Data received: {data}')
@@ -79,16 +79,16 @@ class HfpProtocol:
     async def initialize_service(self):
         # Perform Service Level Connection Initialization
         self.send_command_line('AT+BRSF=2072')  # Retrieve Supported Features
-        line = await(self.next_line())
-        line = await(self.next_line())
+        await (self.next_line())
+        await (self.next_line())
 
         self.send_command_line('AT+CIND=?')
-        line = await(self.next_line())
-        line = await(self.next_line())
+        await (self.next_line())
+        await (self.next_line())
 
         self.send_command_line('AT+CIND?')
-        line = await(self.next_line())
-        line = await(self.next_line())
+        await (self.next_line())
+        await (self.next_line())
 
         self.send_command_line('AT+CMER=3,0,0,1')
-        line = await(self.next_line())
+        await (self.next_line())

bumble/host.py

@@ -16,16 +16,60 @@
 # Imports
 # -----------------------------------------------------------------------------
 import asyncio
+import collections
 import logging
-from pyee import EventEmitter
+import struct
+
 from colors import color
 
-from .hci import *
-from .l2cap import *
-from .att import *
-from .gatt import *
-from .smp import *
-from .core import ConnectionParameters
+from bumble.l2cap import L2CAP_PDU
+
+from .hci import (
+    HCI_ACL_DATA_PACKET,
+    HCI_COMMAND_COMPLETE_EVENT,
+    HCI_COMMAND_PACKET,
+    HCI_EVENT_PACKET,
+    HCI_LE_READ_BUFFER_SIZE_COMMAND,
+    HCI_LE_READ_LOCAL_SUPPORTED_FEATURES_COMMAND,
+    HCI_LE_READ_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND,
+    HCI_LE_WRITE_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND,
+    HCI_READ_BUFFER_SIZE_COMMAND,
+    HCI_READ_LOCAL_VERSION_INFORMATION_COMMAND,
+    HCI_RESET_COMMAND,
+    HCI_SUCCESS,
+    HCI_SUPPORTED_COMMANDS_FLAGS,
+    HCI_VERSION_BLUETOOTH_CORE_4_0,
+    HCI_AclDataPacket,
+    HCI_AclDataPacketAssembler,
+    HCI_Constant,
+    HCI_Error,
+    HCI_LE_Long_Term_Key_Request_Negative_Reply_Command,
+    HCI_LE_Long_Term_Key_Request_Reply_Command,
+    HCI_LE_Read_Buffer_Size_Command,
+    HCI_LE_Read_Local_Supported_Features_Command,
+    HCI_LE_Read_Suggested_Default_Data_Length_Command,
+    HCI_LE_Remote_Connection_Parameter_Request_Reply_Command,
+    HCI_LE_Set_Event_Mask_Command,
+    HCI_LE_Write_Suggested_Default_Data_Length_Command,
+    HCI_Link_Key_Request_Negative_Reply_Command,
+    HCI_Link_Key_Request_Reply_Command,
+    HCI_PIN_Code_Request_Negative_Reply_Command,
+    HCI_Packet,
+    HCI_Read_Buffer_Size_Command,
+    HCI_Read_Local_Supported_Commands_Command,
+    HCI_Read_Local_Version_Information_Command,
+    HCI_Reset_Command,
+    HCI_Set_Event_Mask_Command,
+)
+from .core import (
+    BT_BR_EDR_TRANSPORT,
+    BT_CENTRAL_ROLE,
+    BT_LE_TRANSPORT,
+    ConnectionPHY,
+    ConnectionParameters,
+)
+from .utils import AbortableEventEmitter
+
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -36,11 +80,15 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
+
 HOST_DEFAULT_HC_LE_ACL_DATA_PACKET_LENGTH = 27
 HOST_HC_TOTAL_NUM_LE_ACL_DATA_PACKETS     = 1
 HOST_DEFAULT_HC_ACL_DATA_PACKET_LENGTH    = 27
 HOST_HC_TOTAL_NUM_ACL_DATA_PACKETS        = 1
 
+# fmt: on
+
 
 # -----------------------------------------------------------------------------
 class Connection:
@@ -61,12 +109,13 @@ class Connection:
 
 
 # -----------------------------------------------------------------------------
-class Host(EventEmitter):
+class Host(AbortableEventEmitter):
     def __init__(self, controller_source=None, controller_sink=None):
         super().__init__()
 
         self.hci_sink = None
         self.ready = False  # True when we can accept incoming packets
+        self.reset_done = False
         self.connections = {}  # Connections, by connection handle
         self.pending_command = None
         self.pending_response = None
@@ -92,73 +141,122 @@ class Host(EventEmitter):
         if controller_sink:
             self.set_packet_sink(controller_sink)
 
+    async def flush(self):
+        # Make sure no command is pending
+        await self.command_semaphore.acquire()
+
+        # Flush current host state, then release command semaphore
+        self.emit('flush')
+        self.command_semaphore.release()
+
     async def reset(self):
+        if self.ready:
+            self.ready = False
+            await self.flush()
+
         await self.send_command(HCI_Reset_Command(), check_result=True)
         self.ready = True
 
-        response = await self.send_command(HCI_Read_Local_Supported_Commands_Command(), check_result=True)
+        response = await self.send_command(
+            HCI_Read_Local_Supported_Commands_Command(), check_result=True
+        )
         self.local_supported_commands = response.return_parameters.supported_commands
 
         if self.supports_command(HCI_LE_READ_LOCAL_SUPPORTED_FEATURES_COMMAND):
-            response = await self.send_command(HCI_LE_Read_Local_Supported_Features_Command(), check_result=True)
-            self.local_le_features = struct.unpack('<Q', response.return_parameters.le_features)[0]
+            response = await self.send_command(
+                HCI_LE_Read_Local_Supported_Features_Command(), check_result=True
+            )
+            self.local_le_features = struct.unpack(
+                '<Q', response.return_parameters.le_features
+            )[0]
 
         if self.supports_command(HCI_READ_LOCAL_VERSION_INFORMATION_COMMAND):
-            response = await self.send_command(HCI_Read_Local_Version_Information_Command(), check_result=True)
+            response = await self.send_command(
+                HCI_Read_Local_Version_Information_Command(), check_result=True
+            )
             self.local_version = response.return_parameters
 
-        await self.send_command(HCI_Set_Event_Mask_Command(event_mask = bytes.fromhex('FFFFFFFFFFFFFF3F')))
+        await self.send_command(
+            HCI_Set_Event_Mask_Command(event_mask=bytes.fromhex('FFFFFFFFFFFFFF3F'))
+        )
 
-        if self.local_version is not None and self.local_version.hci_version <= HCI_VERSION_BLUETOOTH_CORE_4_0:
-            # Some older controllers don't like event masks with bits they don't understand
+        if (
+            self.local_version is not None
+            and self.local_version.hci_version <= HCI_VERSION_BLUETOOTH_CORE_4_0
+        ):
+            # Some older controllers don't like event masks with bits they don't
+            # understand
             le_event_mask = bytes.fromhex('1F00000000000000')
         else:
             le_event_mask = bytes.fromhex('FFFFF00000000000')
-        await self.send_command(HCI_LE_Set_Event_Mask_Command(le_event_mask = le_event_mask))
+
+        await self.send_command(
+            HCI_LE_Set_Event_Mask_Command(le_event_mask=le_event_mask)
+        )
 
         if self.supports_command(HCI_READ_BUFFER_SIZE_COMMAND):
-            response = await self.send_command(HCI_Read_Buffer_Size_Command(), check_result=True)
-            self.hc_acl_data_packet_length     = response.return_parameters.hc_acl_data_packet_length
-            self.hc_total_num_acl_data_packets = response.return_parameters.hc_total_num_acl_data_packets
+            response = await self.send_command(
+                HCI_Read_Buffer_Size_Command(), check_result=True
+            )
+            self.hc_acl_data_packet_length = (
+                response.return_parameters.hc_acl_data_packet_length
+            )
+            self.hc_total_num_acl_data_packets = (
+                response.return_parameters.hc_total_num_acl_data_packets
+            )
 
             logger.debug(
-                f'HCI ACL flow control: hc_acl_data_packet_length={self.hc_acl_data_packet_length},'
+                'HCI ACL flow control: '
+                f'hc_acl_data_packet_length={self.hc_acl_data_packet_length},'
                 f'hc_total_num_acl_data_packets={self.hc_total_num_acl_data_packets}'
             )
 
         if self.supports_command(HCI_LE_READ_BUFFER_SIZE_COMMAND):
-            response = await self.send_command(HCI_LE_Read_Buffer_Size_Command(), check_result=True)
-            self.hc_le_acl_data_packet_length     = response.return_parameters.hc_le_acl_data_packet_length
-            self.hc_total_num_le_acl_data_packets = response.return_parameters.hc_total_num_le_acl_data_packets
+            response = await self.send_command(
+                HCI_LE_Read_Buffer_Size_Command(), check_result=True
+            )
+            self.hc_le_acl_data_packet_length = (
+                response.return_parameters.hc_le_acl_data_packet_length
+            )
+            self.hc_total_num_le_acl_data_packets = (
+                response.return_parameters.hc_total_num_le_acl_data_packets
+            )
 
             logger.debug(
-                f'HCI LE ACL flow control: hc_le_acl_data_packet_length={self.hc_le_acl_data_packet_length},'
-                f'hc_total_num_le_acl_data_packets={self.hc_total_num_le_acl_data_packets}'
+                'HCI LE ACL flow control: '
+                f'hc_le_acl_data_packet_length={self.hc_le_acl_data_packet_length},'
+                'hc_total_num_le_acl_data_packets='
+                f'{self.hc_total_num_le_acl_data_packets}'
             )
 
             if (
-                response.return_parameters.hc_le_acl_data_packet_length == 0 or
-                response.return_parameters.hc_total_num_le_acl_data_packets == 0
+                response.return_parameters.hc_le_acl_data_packet_length == 0
+                or response.return_parameters.hc_total_num_le_acl_data_packets == 0
             ):
                 # LE and Classic share the same values
                 self.hc_le_acl_data_packet_length = self.hc_acl_data_packet_length
-                self.hc_total_num_le_acl_data_packets = self.hc_total_num_acl_data_packets
+                self.hc_total_num_le_acl_data_packets = (
+                    self.hc_total_num_acl_data_packets
+                )
 
-        if (
-            self.supports_command(HCI_LE_READ_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND) and
-            self.supports_command(HCI_LE_WRITE_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND)
-        ):
-            response = await self.send_command(HCI_LE_Read_Suggested_Default_Data_Length_Command())
+        if self.supports_command(
+            HCI_LE_READ_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND
+        ) and self.supports_command(HCI_LE_WRITE_SUGGESTED_DEFAULT_DATA_LENGTH_COMMAND):
+            response = await self.send_command(
+                HCI_LE_Read_Suggested_Default_Data_Length_Command()
+            )
             suggested_max_tx_octets = response.return_parameters.suggested_max_tx_octets
             suggested_max_tx_time = response.return_parameters.suggested_max_tx_time
             if (
-                suggested_max_tx_octets != self.suggested_max_tx_octets or
-                suggested_max_tx_time != self.suggested_max_tx_time
+                suggested_max_tx_octets != self.suggested_max_tx_octets
+                or suggested_max_tx_time != self.suggested_max_tx_time
             ):
-                await self.send_command(HCI_LE_Write_Suggested_Default_Data_Length_Command(
+                await self.send_command(
+                    HCI_LE_Write_Suggested_Default_Data_Length_Command(
                         suggested_max_tx_octets=self.suggested_max_tx_octets,
-                    suggested_max_tx_time   = self.suggested_max_tx_time
-                ))
+                        suggested_max_tx_time=self.suggested_max_tx_time,
+                    )
+                )
 
         self.reset_done = True
 
@@ -196,21 +294,25 @@ class Host(EventEmitter):
 
                 # Check the return parameters if required
                 if check_result:
-                    if type(response.return_parameters) is int:
+                    if isinstance(response.return_parameters, int):
                         status = response.return_parameters
-                    elif type(response.return_parameters) is bytes:
+                    elif isinstance(response.return_parameters, bytes):
                         # return parameters first field is a one byte status code
                         status = response.return_parameters[0]
                     else:
                         status = response.return_parameters.status
 
                     if status != HCI_SUCCESS:
-                        logger.warning(f'{command.name} failed ({HCI_Constant.error_name(status)})')
+                        logger.warning(
+                            f'{command.name} failed ({HCI_Constant.error_name(status)})'
+                        )
                         raise HCI_Error(status)
 
                 return response
             except Exception as error:
-                logger.warning(f'{color("!!! Exception while sending HCI packet:", "red")} {error}')
+                logger.warning(
+                    f'{color("!!! Exception while sending HCI packet:", "red")} {error}'
+                )
                 raise error
             finally:
                 self.pending_command = None
@@ -238,9 +340,11 @@ class Host(EventEmitter):
                 pb_flag=pb_flag,
                 bc_flag=0,
                 data_total_length=data_total_length,
-                data               = l2cap_pdu[offset:offset + data_total_length]
+                data=l2cap_pdu[offset : offset + data_total_length],
+            )
+            logger.debug(
+                f'{color("### HOST -> CONTROLLER", "blue")}: (CID={cid}) {acl_packet}'
             )
-            logger.debug(f'{color("### HOST -> CONTROLLER", "blue")}: (CID={cid}) {acl_packet}')
             self.queue_acl_packet(acl_packet)
             pb_flag = 1
             offset += data_total_length
@@ -251,11 +355,17 @@ class Host(EventEmitter):
         self.check_acl_packet_queue()
 
         if len(self.acl_packet_queue):
-            logger.debug(f'{self.acl_packets_in_flight} ACL packets in flight, {len(self.acl_packet_queue)} in queue')
+            logger.debug(
+                f'{self.acl_packets_in_flight} ACL packets in flight, '
+                f'{len(self.acl_packet_queue)} in queue'
+            )
 
     def check_acl_packet_queue(self):
         # Send all we can (TODO: support different LE/Classic limits)
-        while len(self.acl_packet_queue) > 0 and self.acl_packets_in_flight < self.hc_total_num_le_acl_data_packets:
+        while (
+            len(self.acl_packet_queue) > 0
+            and self.acl_packets_in_flight < self.hc_total_num_le_acl_data_packets
+        ):
             packet = self.acl_packet_queue.pop()
             self.send_hci_packet(packet)
             self.acl_packets_in_flight += 1
@@ -267,7 +377,9 @@ class Host(EventEmitter):
                 if value == command:
                     # Check if the flag is set
                     if octet < len(self.local_supported_commands) and flag_position < 8:
-                        return (self.local_supported_commands[octet] & (1 << flag_position)) != 0
+                        return (
+                            self.local_supported_commands[octet] & (1 << flag_position)
+                        ) != 0
 
         return False
 
@@ -289,15 +401,17 @@ class Host(EventEmitter):
 
     @property
     def supported_le_features(self):
-        return [feature for feature in range(64) if self.local_le_features & (1 << feature)]
+        return [
+            feature for feature in range(64) if self.local_le_features & (1 << feature)
+        ]
 
     # Packet Sink protocol (packets coming from the controller via HCI)
     def on_packet(self, packet):
         hci_packet = HCI_Packet.from_bytes(packet)
         if self.ready or (
-            hci_packet.hci_packet_type == HCI_EVENT_PACKET and
-            hci_packet.event_code == HCI_COMMAND_COMPLETE_EVENT and
-            hci_packet.command_opcode == HCI_RESET_COMMAND
+            hci_packet.hci_packet_type == HCI_EVENT_PACKET
+            and hci_packet.event_code == HCI_COMMAND_COMPLETE_EVENT
+            and hci_packet.command_opcode == HCI_RESET_COMMAND
         ):
             self.on_hci_packet(hci_packet)
         else:
@@ -336,7 +450,11 @@ class Host(EventEmitter):
         if self.pending_response:
             # Check that it is what we were expecting
             if self.pending_command.op_code != event.command_opcode:
-                logger.warning(f'!!! command result mismatch, expected 0x{self.pending_command.op_code:X} but got 0x{event.command_opcode:X}')
+                logger.warning(
+                    '!!! command result mismatch, expected '
+                    f'0x{self.pending_command.op_code:X} but got '
+                    f'0x{event.command_opcode:X}'
+                )
 
             self.pending_response.set_result(event)
         else:
@@ -350,9 +468,11 @@ class Host(EventEmitter):
 
     def on_hci_command_complete_event(self, event):
         if event.command_opcode == 0:
-            # This is used just for the Num_HCI_Command_Packets field, not related to an actual command
+            # This is used just for the Num_HCI_Command_Packets field, not related to
+            # an actual command
             logger.debug('no-command event')
-        else:
+            return None
+
         return self.on_command_processed(event)
 
     def on_hci_command_status_event(self, event):
@@ -364,7 +484,12 @@ class Host(EventEmitter):
             self.acl_packets_in_flight -= total_packets
             self.check_acl_packet_queue()
         else:
-            logger.warning(color(f'!!! {total_packets} completed but only {self.acl_packets_in_flight} in flight'))
+            logger.warning(
+                color(
+                    '!!! {total_packets} completed but only '
+                    f'{self.acl_packets_in_flight} in flight'
+                )
+            )
             self.acl_packets_in_flight = 0
 
     # Classic only
@@ -381,18 +506,27 @@ class Host(EventEmitter):
         # Check if this is a cancellation
         if event.status == HCI_SUCCESS:
             # Create/update the connection
-            logger.debug(f'### CONNECTION: [0x{event.connection_handle:04X}] {event.peer_address} as {HCI_Constant.role_name(event.role)}')
+            logger.debug(
+                f'### CONNECTION: [0x{event.connection_handle:04X}] '
+                f'{event.peer_address} as {HCI_Constant.role_name(event.role)}'
+            )
 
             connection = self.connections.get(event.connection_handle)
             if connection is None:
-                connection = Connection(self, event.connection_handle, event.role, event.peer_address, BT_LE_TRANSPORT)
+                connection = Connection(
+                    self,
+                    event.connection_handle,
+                    event.role,
+                    event.peer_address,
+                    BT_LE_TRANSPORT,
+                )
                 self.connections[event.connection_handle] = connection
 
             # Notify the client
             connection_parameters = ConnectionParameters(
                 event.connection_interval,
                 event.peripheral_latency,
-                event.supervision_timeout
+                event.supervision_timeout,
             )
             self.emit(
                 'connection',
@@ -401,13 +535,15 @@ class Host(EventEmitter):
                 event.peer_address,
                 None,
                 event.role,
-                connection_parameters
+                connection_parameters,
             )
         else:
             logger.debug(f'### CONNECTION FAILED: {event.status}')
 
             # Notify the listeners
-            self.emit('connection_failure', BT_LE_TRANSPORT, event.peer_address, event.status)
+            self.emit(
+                'connection_failure', BT_LE_TRANSPORT, event.peer_address, event.status
+            )
 
     def on_hci_le_enhanced_connection_complete_event(self, event):
         # Just use the same implementation as for the non-enhanced event for now
@@ -416,11 +552,20 @@ class Host(EventEmitter):
     def on_hci_connection_complete_event(self, event):
         if event.status == HCI_SUCCESS:
             # Create/update the connection
-            logger.debug(f'### BR/EDR CONNECTION: [0x{event.connection_handle:04X}] {event.bd_addr}')
+            logger.debug(
+                f'### BR/EDR CONNECTION: [0x{event.connection_handle:04X}] '
+                f'{event.bd_addr}'
+            )
 
             connection = self.connections.get(event.connection_handle)
             if connection is None:
-                connection = Connection(self, event.connection_handle, BT_CENTRAL_ROLE, event.bd_addr, BT_BR_EDR_TRANSPORT)
+                connection = Connection(
+                    self,
+                    event.connection_handle,
+                    BT_CENTRAL_ROLE,
+                    event.bd_addr,
+                    BT_BR_EDR_TRANSPORT,
+                )
                 self.connections[event.connection_handle] = connection
 
             # Notify the client
@@ -431,13 +576,15 @@ class Host(EventEmitter):
                 event.bd_addr,
                 None,
                 BT_CENTRAL_ROLE,
-                None
+                None,
             )
         else:
             logger.debug(f'### BR/EDR CONNECTION FAILED: {event.status}')
 
             # Notify the client
-            self.emit('connection_failure', BT_BR_EDR_TRANSPORT, event.bd_addr, event.status)
+            self.emit(
+                'connection_failure', BT_BR_EDR_TRANSPORT, event.bd_addr, event.status
+            )
 
     def on_hci_disconnection_complete_event(self, event):
         # Find the connection
@@ -446,7 +593,12 @@ class Host(EventEmitter):
             return
 
         if event.status == HCI_SUCCESS:
-            logger.debug(f'### DISCONNECTION: [0x{event.connection_handle:04X}] {connection.peer_address} as {HCI_Constant.role_name(connection.role)}, reason={event.reason}')
+            logger.debug(
+                f'### DISCONNECTION: [0x{event.connection_handle:04X}] '
+                f'{connection.peer_address} as '
+                f'{HCI_Constant.role_name(connection.role)}, '
+                f'reason={event.reason}'
+            )
             del self.connections[event.connection_handle]
 
             # Notify the listeners
@@ -467,11 +619,15 @@ class Host(EventEmitter):
             connection_parameters = ConnectionParameters(
                 event.connection_interval,
                 event.peripheral_latency,
-                event.supervision_timeout
+                event.supervision_timeout,
+            )
+            self.emit(
+                'connection_parameters_update', connection.handle, connection_parameters
             )
-            self.emit('connection_parameters_update', connection.handle, connection_parameters)
         else:
-            self.emit('connection_parameters_update_failure', connection.handle, event.status)
+            self.emit(
+                'connection_parameters_update_failure', connection.handle, event.status
+            )
 
     def on_hci_le_phy_update_complete_event(self, event):
         if (connection := self.connections.get(event.connection_handle)) is None:
@@ -504,10 +660,10 @@ class Host(EventEmitter):
                 connection_handle=event.connection_handle,
                 interval_min=event.interval_min,
                 interval_max=event.interval_max,
-                latency           = event.latency,
+                max_latency=event.max_latency,
                 timeout=event.timeout,
                 min_ce_length=0,
-                max_ce_length     = 0
+                max_ce_length=0,
             )
         )
 
@@ -521,15 +677,19 @@ class Host(EventEmitter):
                 logger.debug('no long term key provider')
                 long_term_key = None
             else:
-                long_term_key = await self.long_term_key_provider(
+                long_term_key = await self.abort_on(
+                    'flush',
+                    # pylint: disable-next=not-callable
+                    self.long_term_key_provider(
                         connection.handle,
                         event.random_number,
-                    event.encryption_diversifier
+                        event.encryption_diversifier,
+                    ),
                 )
             if long_term_key:
                 response = HCI_LE_Long_Term_Key_Request_Reply_Command(
                     connection_handle=event.connection_handle,
-                    long_term_key     = long_term_key
+                    long_term_key=long_term_key,
                 )
             else:
                 response = HCI_LE_Long_Term_Key_Request_Negative_Reply_Command(
@@ -548,10 +708,16 @@ class Host(EventEmitter):
 
     def on_hci_role_change_event(self, event):
         if event.status == HCI_SUCCESS:
-            logger.debug(f'role change for {event.bd_addr}: {HCI_Constant.role_name(event.new_role)}')
+            logger.debug(
+                f'role change for {event.bd_addr}: '
+                f'{HCI_Constant.role_name(event.new_role)}'
+            )
             # TODO: lookup the connection and update the role
         else:
-            logger.debug(f'role change for {event.bd_addr} failed: {HCI_Constant.error_name(event.status)}')
+            logger.debug(
+                f'role change for {event.bd_addr} failed: '
+                f'{HCI_Constant.error_name(event.status)}'
+            )
 
     def on_hci_le_data_length_change_event(self, event):
         self.emit(
@@ -560,7 +726,7 @@ class Host(EventEmitter):
             event.max_tx_octets,
             event.max_tx_time,
             event.max_rx_octets,
-            event.max_rx_time
+            event.max_rx_time,
         )
 
     def on_hci_authentication_complete_event(self, event):
@@ -568,21 +734,35 @@ class Host(EventEmitter):
         if event.status == HCI_SUCCESS:
             self.emit('connection_authentication', event.connection_handle)
         else:
-            self.emit('connection_authentication_failure', event.connection_handle, event.status)
+            self.emit(
+                'connection_authentication_failure',
+                event.connection_handle,
+                event.status,
+            )
 
     def on_hci_encryption_change_event(self, event):
         # Notify the client
         if event.status == HCI_SUCCESS:
-            self.emit('connection_encryption_change', event.connection_handle, event.encryption_enabled)
+            self.emit(
+                'connection_encryption_change',
+                event.connection_handle,
+                event.encryption_enabled,
+            )
         else:
-            self.emit('connection_encryption_failure', event.connection_handle, event.status)
+            self.emit(
+                'connection_encryption_failure', event.connection_handle, event.status
+            )
 
     def on_hci_encryption_key_refresh_complete_event(self, event):
         # Notify the client
         if event.status == HCI_SUCCESS:
             self.emit('connection_encryption_key_refresh', event.connection_handle)
         else:
-            self.emit('connection_encryption_key_refresh_failure', event.connection_handle, event.status)
+            self.emit(
+                'connection_encryption_key_refresh_failure',
+                event.connection_handle,
+                event.status,
+            )
 
     def on_hci_link_supervision_timeout_changed_event(self, event):
         pass
@@ -594,19 +774,23 @@ class Host(EventEmitter):
         pass
 
     def on_hci_link_key_notification_event(self, event):
-        logger.debug(f'link key for {event.bd_addr}: {event.link_key.hex()}, type={HCI_Constant.link_key_type_name(event.key_type)}')
+        logger.debug(
+            f'link key for {event.bd_addr}: {event.link_key.hex()}, '
+            f'type={HCI_Constant.link_key_type_name(event.key_type)}'
+        )
         self.emit('link_key', event.bd_addr, event.link_key, event.key_type)
 
     def on_hci_simple_pairing_complete_event(self, event):
-        logger.debug(f'simple pairing complete for {event.bd_addr}: status={HCI_Constant.status_name(event.status)}')
+        logger.debug(
+            f'simple pairing complete for {event.bd_addr}: '
+            f'status={HCI_Constant.status_name(event.status)}'
+        )
 
     def on_hci_pin_code_request_event(self, event):
         # For now, just refuse all requests
         # TODO: delegate the decision
         self.send_command_sync(
-            HCI_PIN_Code_Request_Negative_Reply_Command(
-                bd_addr = event.bd_addr
-            )
+            HCI_PIN_Code_Request_Negative_Reply_Command(bd_addr=event.bd_addr)
         )
 
     def on_hci_link_key_request_event(self, event):
@@ -615,11 +799,14 @@ class Host(EventEmitter):
                 logger.debug('no link key provider')
                 link_key = None
             else:
-                link_key = await self.link_key_provider(event.bd_addr)
+                link_key = await self.abort_on(
+                    'flush',
+                    # pylint: disable-next=not-callable
+                    self.link_key_provider(event.bd_addr),
+                )
             if link_key:
                 response = HCI_Link_Key_Request_Reply_Command(
-                    bd_addr  = event.bd_addr,
-                    link_key = link_key
+                    bd_addr=event.bd_addr, link_key=link_key
                 )
             else:
                 response = HCI_Link_Key_Request_Negative_Reply_Command(
@@ -637,15 +824,21 @@ class Host(EventEmitter):
         pass
 
     def on_hci_user_confirmation_request_event(self, event):
-        self.emit('authentication_user_confirmation_request', event.bd_addr, event.numeric_value)
+        self.emit(
+            'authentication_user_confirmation_request',
+            event.bd_addr,
+            event.numeric_value,
+        )
 
     def on_hci_user_passkey_request_event(self, event):
         self.emit('authentication_user_passkey_request', event.bd_addr)
 
     def on_hci_user_passkey_notification_event(self, event):
-        self.emit('authentication_user_passkey_notification', event.bd_addr, event.passkey)
+        self.emit(
+            'authentication_user_passkey_notification', event.bd_addr, event.passkey
+        )
 
-    def on_hci_inquiry_complete_event(self, event):
+    def on_hci_inquiry_complete_event(self, _event):
         self.emit('inquiry_complete')
 
     def on_hci_inquiry_result_with_rssi_event(self, event):
@@ -655,7 +848,7 @@ class Host(EventEmitter):
                 response.bd_addr,
                 response.class_of_device,
                 b'',
-                response.rssi
+                response.rssi,
             )
 
     def on_hci_extended_inquiry_result_event(self, event):
@@ -664,7 +857,7 @@ class Host(EventEmitter):
             event.bd_addr,
             event.class_of_device,
             event.extended_inquiry_response,
-            event.rssi
+            event.rssi,
         )
 
     def on_hci_remote_name_request_complete_event(self, event):
@@ -674,4 +867,8 @@ class Host(EventEmitter):
             self.emit('remote_name', event.bd_addr, event.remote_name)
 
     def on_hci_remote_host_supported_features_notification_event(self, event):
-        self.emit('remote_host_supported_features', event.bd_addr, event.host_supported_features)
+        self.emit(
+            'remote_host_supported_features',
+            event.bd_addr,
+            event.host_supported_features,
+        )

bumble/keys.py

@@ -20,6 +20,7 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+import asyncio
 import logging
 import os
 import json
@@ -75,7 +76,9 @@ class PairingKeys:
     @staticmethod
     def key_from_dict(keys_dict, key_name):
         key_dict = keys_dict.get(key_name)
-        if key_dict is not None:
+        if key_dict is None:
+            return None
+
         return PairingKeys.Key.from_dict(key_dict)
 
     @staticmethod
@@ -120,9 +123,9 @@ class PairingKeys:
 
     def print(self, prefix=''):
         keys_dict = self.to_dict()
-        for (property, value) in keys_dict.items():
-            if type(value) is dict:
-                print(f'{prefix}{color(property, "cyan")}:')
+        for (container_property, value) in keys_dict.items():
+            if isinstance(value, dict):
+                print(f'{prefix}{color(container_property, "cyan")}:')
                 for (key_property, key_value) in value.items():
                     print(f'{prefix}  {color(key_property, "green")}: {key_value}')
             else:
@@ -137,12 +140,16 @@ class KeyStore:
     async def update(self, name, keys):
         pass
 
-    async def get(self, name):
+    async def get(self, _name):
         return PairingKeys()
 
     async def get_all(self):
         return []
 
+    async def delete_all(self):
+        all_keys = await self.get_all()
+        await asyncio.gather(*(self.delete(name) for (name, _) in all_keys))
+
     async def get_resolving_keys(self):
         all_keys = await self.get_all()
         resolving_keys = []
@@ -188,10 +195,13 @@ class JsonKeyStore(KeyStore):
 
         if filename is None:
             # Use a default for the current user
+
+            # Import here because this may not exist on all platforms
+            # pylint: disable=import-outside-toplevel
             import appdirs
+
             self.directory_name = os.path.join(
-                appdirs.user_data_dir(self.APP_NAME, self.APP_AUTHOR),
-                self.KEYS_DIR
+                appdirs.user_data_dir(self.APP_NAME, self.APP_AUTHOR), self.KEYS_DIR
             )
             json_filename = f'{self.namespace}.json'.lower().replace(':', '-')
             self.filename = os.path.join(self.directory_name, json_filename)
@@ -214,7 +224,7 @@ class JsonKeyStore(KeyStore):
 
     async def load(self):
         try:
-            with open(self.filename, 'r') as json_file:
+            with open(self.filename, 'r', encoding='utf-8') as json_file:
                 return json.load(json_file)
         except FileNotFoundError:
             return {}
@@ -226,7 +236,7 @@ class JsonKeyStore(KeyStore):
 
         # Save to a temporary file
         temp_filename = self.filename + '.tmp'
-        with open(temp_filename, 'w') as output:
+        with open(temp_filename, 'w', encoding='utf-8') as output:
             json.dump(db, output, sort_keys=True, indent=4)
 
         # Atomically replace the previous file
@@ -257,7 +267,16 @@ class JsonKeyStore(KeyStore):
         if namespace is None:
             return []
 
-        return [(name, PairingKeys.from_dict(keys)) for (name, keys) in namespace.items()]
+        return [
+            (name, PairingKeys.from_dict(keys)) for (name, keys) in namespace.items()
+        ]
+
+    async def delete_all(self):
+        db = await self.load()
+
+        db.pop(self.namespace, None)
+
+        await self.save(db)
 
     async def get(self, name):
         db = await self.load()

bumble/link.py

@@ -17,15 +17,16 @@
 # -----------------------------------------------------------------------------
 import logging
 import asyncio
-import websockets
 from functools import partial
+
 from colors import color
+import websockets
 
 from bumble.hci import (
     Address,
     HCI_SUCCESS,
     HCI_CONNECTION_ACCEPT_TIMEOUT_ERROR,
-    HCI_CONNECTION_TIMEOUT_ERROR
+    HCI_CONNECTION_TIMEOUT_ERROR,
 )
 
 # -----------------------------------------------------------------------------
@@ -47,7 +48,8 @@ def parse_parameters(params_str):
 
 
 # -----------------------------------------------------------------------------
-# TODO: add more support for various LL exchanges (see Vol 6, Part B - 2.4 DATA CHANNEL PDU)
+# TODO: add more support for various LL exchanges
+# (see Vol 6, Part B - 2.4 DATA CHANNEL PDU)
 # -----------------------------------------------------------------------------
 class LocalLink:
     '''
@@ -103,23 +105,31 @@ class LocalLink:
             return
 
         # Connect to the first controller with a matching address
-        if peripheral_controller := self.find_controller(le_create_connection_command.peer_address):
-            central_controller.on_link_peripheral_connection_complete(le_create_connection_command, HCI_SUCCESS)
+        if peripheral_controller := self.find_controller(
+            le_create_connection_command.peer_address
+        ):
+            central_controller.on_link_peripheral_connection_complete(
+                le_create_connection_command, HCI_SUCCESS
+            )
             peripheral_controller.on_link_central_connected(central_address)
             return
 
         # No peripheral found
         central_controller.on_link_peripheral_connection_complete(
-            le_create_connection_command,
-            HCI_CONNECTION_ACCEPT_TIMEOUT_ERROR
+            le_create_connection_command, HCI_CONNECTION_ACCEPT_TIMEOUT_ERROR
         )
 
     def connect(self, central_address, le_create_connection_command):
-        logger.debug(f'$$$ CONNECTION {central_address} -> {le_create_connection_command.peer_address}')
+        logger.debug(
+            f'$$$ CONNECTION {central_address} -> '
+            f'{le_create_connection_command.peer_address}'
+        )
         self.pending_connection = (central_address, le_create_connection_command)
         asyncio.get_running_loop().call_soon(self.on_connection_complete)
 
-    def on_disconnection_complete(self, central_address, peripheral_address, disconnect_command):
+    def on_disconnection_complete(
+        self, central_address, peripheral_address, disconnect_command
+    ):
         # Find the controller that initiated the disconnection
         if not (central_controller := self.find_controller(central_address)):
             logger.warning('!!! Initiating controller not found')
@@ -127,16 +137,26 @@ class LocalLink:
 
         # Disconnect from the first controller with a matching address
         if peripheral_controller := self.find_controller(peripheral_address):
-            peripheral_controller.on_link_central_disconnected(central_address, disconnect_command.reason)
+            peripheral_controller.on_link_central_disconnected(
+                central_address, disconnect_command.reason
+            )
 
-        central_controller.on_link_peripheral_disconnection_complete(disconnect_command, HCI_SUCCESS)
+        central_controller.on_link_peripheral_disconnection_complete(
+            disconnect_command, HCI_SUCCESS
+        )
 
     def disconnect(self, central_address, peripheral_address, disconnect_command):
-        logger.debug(f'$$$ DISCONNECTION {central_address} -> {peripheral_address}: reason = {disconnect_command.reason}')
+        logger.debug(
+            f'$$$ DISCONNECTION {central_address} -> '
+            f'{peripheral_address}: reason = {disconnect_command.reason}'
+        )
         args = [central_address, peripheral_address, disconnect_command]
         asyncio.get_running_loop().call_soon(self.on_disconnection_complete, *args)
 
-    def on_connection_encrypted(self, central_address, peripheral_address, rand, ediv, ltk):
+    # pylint: disable=too-many-arguments
+    def on_connection_encrypted(
+        self, central_address, peripheral_address, rand, ediv, ltk
+    ):
         logger.debug(f'*** ENCRYPTION {central_address} -> {peripheral_address}')
 
         if central_controller := self.find_controller(central_address):
@@ -152,6 +172,7 @@ class RemoteLink:
     A Link implementation that communicates with other virtual controllers via a
     WebSocket relay
     '''
+
     def __init__(self, uri):
         self.controller = None
         self.uri = uri
@@ -160,7 +181,9 @@ class RemoteLink:
         self.rpc_result = None
         self.pending_connection = None
         self.central_connections = set()  # List of addresses that we have connected to
-        self.peripheral_connections = set()  # List of addresses that have connected to us
+        self.peripheral_connections = (
+            set()
+        )  # List of addresses that have connected to us
 
         # Connect and run asynchronously
         asyncio.create_task(self.run_connection())
@@ -192,11 +215,14 @@ class RemoteLink:
             try:
                 await item
             except Exception as error:
-                logger.warning(f'{color("!!! Exception in async handler:", "red")} {error}')
+                logger.warning(
+                    f'{color("!!! Exception in async handler:", "red")} {error}'
+                )
 
     async def run_connection(self):
         # Connect to the relay
         logger.debug(f'connecting to {self.uri}')
+        # pylint: disable-next=no-member
         websocket = await websockets.connect(self.uri)
         self.websocket.set_result(websocket)
         logger.debug(f'connected to {self.uri}')
@@ -227,7 +253,9 @@ class RemoteLink:
             self.central_connections.remove(address)
 
         if address in self.peripheral_connections:
-            self.controller.on_link_central_disconnected(address, HCI_CONNECTION_TIMEOUT_ERROR)
+            self.controller.on_link_central_disconnected(
+                address, HCI_CONNECTION_TIMEOUT_ERROR
+            )
             self.peripheral_connections.remove(address)
 
     async def on_unreachable_received(self, target):
@@ -244,7 +272,9 @@ class RemoteLink:
 
     async def on_advertisement_message_received(self, sender, advertisement):
         try:
-            self.controller.on_link_advertising_data(Address(sender), bytes.fromhex(advertisement))
+            self.controller.on_link_advertising_data(
+                Address(sender), bytes.fromhex(advertisement)
+            )
         except Exception:
             logger.exception('exception')
 
@@ -263,11 +293,11 @@ class RemoteLink:
         self.controller.on_link_central_connected(Address(sender))
 
         # Accept the connection by responding to it
-        await self.send_targetted_message(sender, 'connected')
+        await self.send_targeted_message(sender, 'connected')
 
     async def on_connected_message_received(self, sender, _):
         if not self.pending_connection:
-            logger.warn('received a connection ack, but no connection is pending')
+            logger.warning('received a connection ack, but no connection is pending')
             return
 
         # Remember the connection
@@ -275,7 +305,9 @@ class RemoteLink:
 
         # Notify the controller
         logger.debug(f'connected to peripheral {self.pending_connection.peer_address}')
-        self.controller.on_link_peripheral_connection_complete(self.pending_connection, HCI_SUCCESS)
+        self.controller.on_link_peripheral_connection_complete(
+            self.pending_connection, HCI_SUCCESS
+        )
 
     async def on_disconnect_message_received(self, sender, message):
         # Notify the controller
@@ -287,7 +319,7 @@ class RemoteLink:
         if sender in self.peripheral_connections:
             self.peripheral_connections.remove(sender)
 
-    async def on_encrypted_message_received(self, sender, message):
+    async def on_encrypted_message_received(self, sender, _):
         # TODO parse params to get real args
         self.controller.on_link_encrypted(Address(sender), bytes(8), 0, bytes(16))
 
@@ -296,7 +328,7 @@ class RemoteLink:
         websocket = await self.websocket
 
         # Create a future value to hold the eventual result
-        assert(self.rpc_result is None)
+        assert self.rpc_result is None
         self.rpc_result = asyncio.get_running_loop().create_future()
 
         # Send the command
@@ -309,7 +341,7 @@ class RemoteLink:
 
         # TODO: parse the result
 
-    async def send_targetted_message(self, target, message):
+    async def send_targeted_message(self, target, message):
         # Ensure we have a connection
         websocket = await self.websocket
 
@@ -326,35 +358,61 @@ class RemoteLink:
         self.execute(self.notify_address_changed)
 
     async def send_advertising_data_to_relay(self, data):
-        await self.send_targetted_message('*', f'advertisement:{data.hex()}')
+        await self.send_targeted_message('*', f'advertisement:{data.hex()}')
 
-    def send_advertising_data(self, sender_address, data):
+    def send_advertising_data(self, _, data):
         self.execute(partial(self.send_advertising_data_to_relay, data))
 
     async def send_acl_data_to_relay(self, peer_address, data):
-        await self.send_targetted_message(peer_address, f'acl:{data.hex()}')
+        await self.send_targeted_message(peer_address, f'acl:{data.hex()}')
 
-    def send_acl_data(self, sender_address, peer_address, data):
+    def send_acl_data(self, _, peer_address, data):
         self.execute(partial(self.send_acl_data_to_relay, peer_address, data))
 
     async def send_connection_request_to_relay(self, peer_address):
-        await self.send_targetted_message(peer_address, 'connect')
+        await self.send_targeted_message(peer_address, 'connect')
 
-    def connect(self, central_address, le_create_connection_command):
+    def connect(self, _, le_create_connection_command):
         if self.pending_connection:
-            logger.warn('connection already pending')
+            logger.warning('connection already pending')
             return
         self.pending_connection = le_create_connection_command
-        self.execute(partial(self.send_connection_request_to_relay, str(le_create_connection_command.peer_address)))
+        self.execute(
+            partial(
+                self.send_connection_request_to_relay,
+                str(le_create_connection_command.peer_address),
+            )
+        )
 
     def on_disconnection_complete(self, disconnect_command):
-        self.controller.on_link_peripheral_disconnection_complete(disconnect_command, HCI_SUCCESS)
+        self.controller.on_link_peripheral_disconnection_complete(
+            disconnect_command, HCI_SUCCESS
+        )
 
     def disconnect(self, central_address, peripheral_address, disconnect_command):
-        logger.debug(f'disconnect {central_address} -> {peripheral_address}: reason = {disconnect_command.reason}')
-        self.execute(partial(self.send_targetted_message, peripheral_address, f'disconnect:reason={disconnect_command.reason}'))
-        asyncio.get_running_loop().call_soon(self.on_disconnection_complete, disconnect_command)
+        logger.debug(
+            f'disconnect {central_address} -> '
+            f'{peripheral_address}: reason = {disconnect_command.reason}'
+        )
+        self.execute(
+            partial(
+                self.send_targeted_message,
+                peripheral_address,
+                f'disconnect:reason={disconnect_command.reason}',
+            )
+        )
+        asyncio.get_running_loop().call_soon(
+            self.on_disconnection_complete, disconnect_command
+        )
 
-    def on_connection_encrypted(self, central_address, peripheral_address, rand, ediv, ltk):
-        asyncio.get_running_loop().call_soon(self.controller.on_link_encrypted, peripheral_address, rand, ediv, ltk)
-        self.execute(partial(self.send_targetted_message, peripheral_address, f'encrypted:ltk={ltk.hex()}'))
+    def on_connection_encrypted(self, _, peripheral_address, rand, ediv, ltk):
+        asyncio.get_running_loop().call_soon(
+            self.controller.on_link_encrypted, peripheral_address, rand, ediv, ltk
+        )
+        self.execute(
+            partial(
+                self.send_targeted_message,
+                peripheral_address,
+                f'encrypted:ltk={ltk.hex()}',
+            )
+        )

bumble/profiles/asha_service.py

@@ -0,0 +1,171 @@
+# Copyright 2021-2022 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+import struct
+import logging
+from typing import List
+from ..core import AdvertisingData
+from ..gatt import (
+    GATT_ASHA_SERVICE,
+    GATT_ASHA_READ_ONLY_PROPERTIES_CHARACTERISTIC,
+    GATT_ASHA_AUDIO_CONTROL_POINT_CHARACTERISTIC,
+    GATT_ASHA_AUDIO_STATUS_CHARACTERISTIC,
+    GATT_ASHA_VOLUME_CHARACTERISTIC,
+    GATT_ASHA_LE_PSM_OUT_CHARACTERISTIC,
+    TemplateService,
+    Characteristic,
+    CharacteristicValue,
+)
+from ..device import Device
+
+# -----------------------------------------------------------------------------
+# Logging
+# -----------------------------------------------------------------------------
+logger = logging.getLogger(__name__)
+
+
+# -----------------------------------------------------------------------------
+class AshaService(TemplateService):
+    UUID = GATT_ASHA_SERVICE
+    OPCODE_START = 1
+    OPCODE_STOP = 2
+    OPCODE_STATUS = 3
+    PROTOCOL_VERSION = 0x01
+    RESERVED_FOR_FUTURE_USE = [00, 00]
+    FEATURE_MAP = [0x01]  # [LE CoC audio output streaming supported]
+    SUPPORTED_CODEC_ID = [0x02, 0x01]  # Codec IDs [G.722 at 16 kHz]
+    RENDER_DELAY = [00, 00]
+
+    def __init__(self, capability: int, hisyncid: List[int], device: Device, psm=0):
+        self.hisyncid = hisyncid
+        self.capability = capability  # Device Capabilities [Left, Monaural]
+        self.device = device
+        self.emitted_data_name = 'ASHA_data_' + str(self.capability)
+        self.audio_out_data = b''
+        self.psm = psm  # a non-zero psm is mainly for testing purpose
+
+        # Handler for volume control
+        def on_volume_write(_connection, value):
+            logger.info(f'--- VOLUME Write:{value[0]}')
+
+        # Handler for audio control commands
+        def on_audio_control_point_write(_connection, value):
+            logger.info(f'--- AUDIO CONTROL POINT Write:{value.hex()}')
+            opcode = value[0]
+            if opcode == AshaService.OPCODE_START:
+                # Start
+                audio_type = ('Unknown', 'Ringtone', 'Phone Call', 'Media')[value[2]]
+                logger.info(
+                    f'### START: codec={value[1]}, '
+                    f'audio_type={audio_type}, '
+                    f'volume={value[3]}, '
+                    f'otherstate={value[4]}'
+                )
+            elif opcode == AshaService.OPCODE_STOP:
+                logger.info('### STOP')
+            elif opcode == AshaService.OPCODE_STATUS:
+                logger.info(f'### STATUS: connected={value[1]}')
+
+            # TODO Respond with a status
+            # asyncio.create_task(device.notify_subscribers(audio_status_characteristic,
+            # force=True))
+
+        self.read_only_properties_characteristic = Characteristic(
+            GATT_ASHA_READ_ONLY_PROPERTIES_CHARACTERISTIC,
+            Characteristic.READ,
+            Characteristic.READABLE,
+            bytes(
+                [
+                    AshaService.PROTOCOL_VERSION,  # Version
+                    self.capability,
+                ]
+            )
+            + bytes(self.hisyncid)
+            + bytes(AshaService.FEATURE_MAP)
+            + bytes(AshaService.RENDER_DELAY)
+            + bytes(AshaService.RESERVED_FOR_FUTURE_USE)
+            + bytes(AshaService.SUPPORTED_CODEC_ID),
+        )
+
+        self.audio_control_point_characteristic = Characteristic(
+            GATT_ASHA_AUDIO_CONTROL_POINT_CHARACTERISTIC,
+            Characteristic.WRITE | Characteristic.WRITE_WITHOUT_RESPONSE,
+            Characteristic.WRITEABLE,
+            CharacteristicValue(write=on_audio_control_point_write),
+        )
+        self.audio_status_characteristic = Characteristic(
+            GATT_ASHA_AUDIO_STATUS_CHARACTERISTIC,
+            Characteristic.READ | Characteristic.NOTIFY,
+            Characteristic.READABLE,
+            bytes([0]),
+        )
+        self.volume_characteristic = Characteristic(
+            GATT_ASHA_VOLUME_CHARACTERISTIC,
+            Characteristic.WRITE_WITHOUT_RESPONSE,
+            Characteristic.WRITEABLE,
+            CharacteristicValue(write=on_volume_write),
+        )
+
+        # Register an L2CAP CoC server
+        def on_coc(channel):
+            def on_data(data):
+                logging.debug(f'<<< data received:{data}')
+
+                self.emit(self.emitted_data_name, data)
+                self.audio_out_data += data
+
+            channel.sink = on_data
+
+        # let the server find a free PSM
+        self.psm = self.device.register_l2cap_channel_server(self.psm, on_coc, 8)
+        self.le_psm_out_characteristic = Characteristic(
+            GATT_ASHA_LE_PSM_OUT_CHARACTERISTIC,
+            Characteristic.READ,
+            Characteristic.READABLE,
+            struct.pack('<H', self.psm),
+        )
+
+        characteristics = [
+            self.read_only_properties_characteristic,
+            self.audio_control_point_characteristic,
+            self.audio_status_characteristic,
+            self.volume_characteristic,
+            self.le_psm_out_characteristic,
+        ]
+
+        super().__init__(characteristics)
+
+    def get_advertising_data(self):
+        # Advertisement only uses 4 least significant bytes of the HiSyncId.
+        return bytes(
+            AdvertisingData(
+                [
+                    (
+                        AdvertisingData.SERVICE_DATA_16_BIT_UUID,
+                        bytes(GATT_ASHA_SERVICE)
+                        + bytes(
+                            [
+                                AshaService.PROTOCOL_VERSION,
+                                self.capability,
+                            ]
+                        )
+                        + bytes(self.hisyncid[:4]),
+                    ),
+                ]
+            )
+        )

bumble/profiles/battery_service.py

@@ -23,7 +23,7 @@ from ..gatt import (
     TemplateService,
     Characteristic,
     CharacteristicValue,
-    PackedCharacteristicAdapter
+    PackedCharacteristicAdapter,
 )
 
 
@@ -38,9 +38,9 @@ class BatteryService(TemplateService):
                 GATT_BATTERY_LEVEL_CHARACTERISTIC,
                 Characteristic.READ | Characteristic.NOTIFY,
                 Characteristic.READABLE,
-                CharacteristicValue(read=read_battery_level)
+                CharacteristicValue(read=read_battery_level),
             ),
-            format=BatteryService.BATTERY_LEVEL_FORMAT
+            pack_format=BatteryService.BATTERY_LEVEL_FORMAT,
         )
         super().__init__([self.battery_level_characteristic])
 
@@ -52,10 +52,11 @@ class BatteryServiceProxy(ProfileServiceProxy):
     def __init__(self, service_proxy):
         self.service_proxy = service_proxy
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(GATT_BATTERY_LEVEL_CHARACTERISTIC):
+        if characteristics := service_proxy.get_characteristics_by_uuid(
+            GATT_BATTERY_LEVEL_CHARACTERISTIC
+        ):
             self.battery_level = PackedCharacteristicAdapter(
-                characteristics[0],
-                format=BatteryService.BATTERY_LEVEL_FORMAT
+                characteristics[0], pack_format=BatteryService.BATTERY_LEVEL_FORMAT
             )
         else:
             self.battery_level = None

bumble/profiles/device_information_service.py

@@ -17,7 +17,7 @@
 # Imports
 # -----------------------------------------------------------------------------
 import struct
-from typing import Tuple
+from typing import Optional, Tuple
 
 from ..gatt_client import ProfileServiceProxy
 from ..gatt import (
@@ -33,7 +33,7 @@ from ..gatt import (
     TemplateService,
     Characteristic,
     DelegatedCharacteristicAdapter,
-    UTF8CharacteristicAdapter
+    UTF8CharacteristicAdapter,
 )
 
 
@@ -52,49 +52,48 @@ class DeviceInformationService(TemplateService):
 
     def __init__(
         self,
-        manufacturer_name: str = None,
-        model_number: str = None,
-        serial_number: str = None,
-        hardware_revision: str = None,
-        firmware_revision: str = None,
-        software_revision: str = None,
-        system_id: Tuple[int, int] = None,  # (OUI, Manufacturer ID)
-        ieee_regulatory_certification_data_list: bytes = None
+        manufacturer_name: Optional[str] = None,
+        model_number: Optional[str] = None,
+        serial_number: Optional[str] = None,
+        hardware_revision: Optional[str] = None,
+        firmware_revision: Optional[str] = None,
+        software_revision: Optional[str] = None,
+        system_id: Optional[Tuple[int, int]] = None,  # (OUI, Manufacturer ID)
+        ieee_regulatory_certification_data_list: Optional[bytes] = None
         # TODO: pnp_id
     ):
         characteristics = [
-            Characteristic(
-                uuid,
-                Characteristic.READ,
-                Characteristic.READABLE,
-                field
-            )
+            Characteristic(uuid, Characteristic.READ, Characteristic.READABLE, field)
             for (field, uuid) in (
                 (manufacturer_name, GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC),
                 (model_number, GATT_MODEL_NUMBER_STRING_CHARACTERISTIC),
                 (serial_number, GATT_SERIAL_NUMBER_STRING_CHARACTERISTIC),
                 (hardware_revision, GATT_HARDWARE_REVISION_STRING_CHARACTERISTIC),
                 (firmware_revision, GATT_FIRMWARE_REVISION_STRING_CHARACTERISTIC),
-                (software_revision, GATT_SOFTWARE_REVISION_STRING_CHARACTERISTIC)
+                (software_revision, GATT_SOFTWARE_REVISION_STRING_CHARACTERISTIC),
             )
             if field is not None
         ]
 
         if system_id is not None:
-            characteristics.append(Characteristic(
+            characteristics.append(
+                Characteristic(
                     GATT_SYSTEM_ID_CHARACTERISTIC,
                     Characteristic.READ,
                     Characteristic.READABLE,
-                self.pack_system_id(*system_id)
-            ))
+                    self.pack_system_id(*system_id),
+                )
+            )
 
         if ieee_regulatory_certification_data_list is not None:
-            characteristics.append(Characteristic(
+            characteristics.append(
+                Characteristic(
                     GATT_REGULATORY_CERTIFICATION_DATA_LIST_CHARACTERISTIC,
                     Characteristic.READ,
                     Characteristic.READABLE,
-                ieee_regulatory_certification_data_list
-            ))
+                    ieee_regulatory_certification_data_list,
+                )
+            )
 
         super().__init__(characteristics)
 
@@ -112,7 +111,7 @@ class DeviceInformationServiceProxy(ProfileServiceProxy):
             ('serial_number', GATT_SERIAL_NUMBER_STRING_CHARACTERISTIC),
             ('hardware_revision', GATT_HARDWARE_REVISION_STRING_CHARACTERISTIC),
             ('firmware_revision', GATT_FIRMWARE_REVISION_STRING_CHARACTERISTIC),
-            ('software_revision', GATT_SOFTWARE_REVISION_STRING_CHARACTERISTIC)
+            ('software_revision', GATT_SOFTWARE_REVISION_STRING_CHARACTERISTIC),
         ):
             if characteristics := service_proxy.get_characteristics_by_uuid(uuid):
                 characteristic = UTF8CharacteristicAdapter(characteristics[0])
@@ -120,16 +119,20 @@ class DeviceInformationServiceProxy(ProfileServiceProxy):
                 characteristic = None
             self.__setattr__(field, characteristic)
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(GATT_SYSTEM_ID_CHARACTERISTIC):
+        if characteristics := service_proxy.get_characteristics_by_uuid(
+            GATT_SYSTEM_ID_CHARACTERISTIC
+        ):
             self.system_id = DelegatedCharacteristicAdapter(
                 characteristics[0],
                 encode=lambda v: DeviceInformationService.pack_system_id(*v),
-                decode=DeviceInformationService.unpack_system_id
+                decode=DeviceInformationService.unpack_system_id,
             )
         else:
             self.system_id = None
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(GATT_REGULATORY_CERTIFICATION_DATA_LIST_CHARACTERISTIC):
+        if characteristics := service_proxy.get_characteristics_by_uuid(
+            GATT_REGULATORY_CERTIFICATION_DATA_LIST_CHARACTERISTIC
+        ):
             self.ieee_regulatory_certification_data_list = characteristics[0]
         else:
             self.ieee_regulatory_certification_data_list = None

bumble/profiles/heart_rate_service.py

@@ -30,7 +30,7 @@ from ..gatt import (
     Characteristic,
     CharacteristicValue,
     DelegatedCharacteristicAdapter,
-    PackedCharacteristicAdapter
+    PackedCharacteristicAdapter,
 )
 
 
@@ -42,12 +42,12 @@ class HeartRateService(TemplateService):
     RESET_ENERGY_EXPENDED = 0x01
 
     class BodySensorLocation(IntEnum):
-        OTHER    = 0,
-        CHEST    = 1,
-        WRIST    = 2,
-        FINGER   = 3,
-        HAND     = 4,
-        EAR_LOBE = 5,
+        OTHER = (0,)
+        CHEST = (1,)
+        WRIST = (2,)
+        FINGER = (3,)
+        HAND = (4,)
+        EAR_LOBE = (5,)
         FOOT = 6
 
     class HeartRateMeasurement:
@@ -56,12 +56,14 @@ class HeartRateService(TemplateService):
             heart_rate,
             sensor_contact_detected=None,
             energy_expended=None,
-            rr_intervals=None
+            rr_intervals=None,
         ):
             if heart_rate < 0 or heart_rate > 0xFFFF:
                 raise ValueError('heart_rate out of range')
 
-            if energy_expended is not None and (energy_expended < 0 or energy_expended > 0xFFFF):
+            if energy_expended is not None and (
+                energy_expended < 0 or energy_expended > 0xFFFF
+            ):
                 raise ValueError('energy_expended out of range')
 
             if rr_intervals:
@@ -87,7 +89,7 @@ class HeartRateService(TemplateService):
                 offset += 1
 
             if flags & (1 << 2):
-                sensor_contact_detected = (flags & (1 << 1) != 0)
+                sensor_contact_detected = flags & (1 << 1) != 0
             else:
                 sensor_contact_detected = None
 
@@ -119,38 +121,43 @@ class HeartRateService(TemplateService):
                 flags |= ((1 if self.sensor_contact_detected else 0) << 1) | (1 << 2)
 
             if self.energy_expended is not None:
-                flags |= (1 << 3)
+                flags |= 1 << 3
                 data += struct.pack('<H', self.energy_expended)
 
             if self.rr_intervals:
-                flags |= (1 << 4)
-                data += b''.join([
+                flags |= 1 << 4
+                data += b''.join(
+                    [
                         struct.pack('<H', int(rr_interval * 1024))
                         for rr_interval in self.rr_intervals
-                ])
+                    ]
+                )
 
             return bytes([flags]) + data
 
         def __str__(self):
-            return f'HeartRateMeasurement(heart_rate={self.heart_rate},'\
-                f' sensor_contact_detected={self.sensor_contact_detected},'\
-                f' energy_expended={self.energy_expended},'\
+            return (
+                f'HeartRateMeasurement(heart_rate={self.heart_rate},'
+                f' sensor_contact_detected={self.sensor_contact_detected},'
+                f' energy_expended={self.energy_expended},'
                 f' rr_intervals={self.rr_intervals})'
+            )
 
     def __init__(
         self,
         read_heart_rate_measurement,
         body_sensor_location=None,
-        reset_energy_expended=None
+        reset_energy_expended=None,
     ):
         self.heart_rate_measurement_characteristic = DelegatedCharacteristicAdapter(
             Characteristic(
                 GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
                 Characteristic.NOTIFY,
                 0,
-                CharacteristicValue(read=read_heart_rate_measurement)
+                CharacteristicValue(read=read_heart_rate_measurement),
             ),
-            encode=lambda value: bytes(value)
+            # pylint: disable=unnecessary-lambda
+            encode=lambda value: bytes(value),
         )
         characteristics = [self.heart_rate_measurement_characteristic]
 
@@ -159,11 +166,12 @@ class HeartRateService(TemplateService):
                 GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC,
                 Characteristic.READ,
                 Characteristic.READABLE,
-                bytes([int(body_sensor_location)])
+                bytes([int(body_sensor_location)]),
             )
             characteristics.append(self.body_sensor_location_characteristic)
 
         if reset_energy_expended:
+
             def write_heart_rate_control_point_value(connection, value):
                 if value == self.RESET_ENERGY_EXPENDED:
                     if reset_energy_expended is not None:
@@ -176,9 +184,9 @@ class HeartRateService(TemplateService):
                     GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC,
                     Characteristic.WRITE,
                     Characteristic.WRITEABLE,
-                    CharacteristicValue(write=write_heart_rate_control_point_value)
+                    CharacteristicValue(write=write_heart_rate_control_point_value),
                 ),
-                format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT
+                pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
             )
             characteristics.append(self.heart_rate_control_point_characteristic)
 
@@ -192,30 +200,38 @@ class HeartRateServiceProxy(ProfileServiceProxy):
     def __init__(self, service_proxy):
         self.service_proxy = service_proxy
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC):
+        if characteristics := service_proxy.get_characteristics_by_uuid(
+            GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC
+        ):
             self.heart_rate_measurement = DelegatedCharacteristicAdapter(
                 characteristics[0],
-                decode=HeartRateService.HeartRateMeasurement.from_bytes
+                decode=HeartRateService.HeartRateMeasurement.from_bytes,
             )
         else:
             self.heart_rate_measurement = None
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC):
+        if characteristics := service_proxy.get_characteristics_by_uuid(
+            GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC
+        ):
             self.body_sensor_location = DelegatedCharacteristicAdapter(
                 characteristics[0],
-                decode=lambda value: HeartRateService.BodySensorLocation(value[0])
+                decode=lambda value: HeartRateService.BodySensorLocation(value[0]),
             )
         else:
             self.body_sensor_location = None
 
-        if characteristics := service_proxy.get_characteristics_by_uuid(GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC):
+        if characteristics := service_proxy.get_characteristics_by_uuid(
+            GATT_HEART_RATE_CONTROL_POINT_CHARACTERISTIC
+        ):
             self.heart_rate_control_point = PackedCharacteristicAdapter(
                 characteristics[0],
-                format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT
+                pack_format=HeartRateService.HEART_RATE_CONTROL_POINT_FORMAT,
             )
         else:
             self.heart_rate_control_point = None
 
     async def reset_energy_expended(self):
         if self.heart_rate_control_point is not None:
-            return await self.heart_rate_control_point.write_value(HeartRateService.RESET_ENERGY_EXPENDED)
+            return await self.heart_rate_control_point.write_value(
+                HeartRateService.RESET_ENERGY_EXPENDED
+            )

bumble/rfcomm.py

@@ -21,7 +21,8 @@ import asyncio
 from colors import color
 from pyee import EventEmitter
 
-from .core import BT_BR_EDR_TRANSPORT, InvalidStateError, ProtocolError, ConnectionError
+from . import core
+from .core import BT_BR_EDR_TRANSPORT, InvalidStateError, ProtocolError
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -32,6 +33,8 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
+
 RFCOMM_PSM = 0x0003
 
 
@@ -98,19 +101,21 @@ RFCOMM_DEFAULT_PREFERRED_MTU      = 1280
 RFCOMM_DYNAMIC_CHANNEL_NUMBER_START = 1
 RFCOMM_DYNAMIC_CHANNEL_NUMBER_END   = 30
 
+# fmt: on
+
 
 # -----------------------------------------------------------------------------
-def fcs(buffer):
-    fcs = 0xFF
+def compute_fcs(buffer):
+    result = 0xFF
     for byte in buffer:
-        fcs = CRC_TABLE[fcs ^ byte]
-    return 0xFF - fcs
+        result = CRC_TABLE[result ^ byte]
+    return 0xFF - result
 
 
 # -----------------------------------------------------------------------------
 class RFCOMM_Frame:
-    def __init__(self, type, c_r, dlci, p_f, information = b'', with_credits = False):
-        self.type        = type
+    def __init__(self, frame_type, c_r, dlci, p_f, information=b'', with_credits=False):
+        self.type = frame_type
         self.c_r = c_r
         self.dlci = dlci
         self.p_f = p_f
@@ -125,18 +130,18 @@ class RFCOMM_Frame:
             # 1-byte length indicator
             self.length = bytes([(length << 1) | 1])
         self.address = (dlci << 2) | (c_r << 1) | 1
-        self.control  = type | (p_f << 4)
-        if type == RFCOMM_UIH_FRAME:
-            self.fcs = fcs(bytes([self.address, self.control]))
+        self.control = frame_type | (p_f << 4)
+        if frame_type == RFCOMM_UIH_FRAME:
+            self.fcs = compute_fcs(bytes([self.address, self.control]))
         else:
-            self.fcs = fcs(bytes([self.address, self.control]) + self.length)
+            self.fcs = compute_fcs(bytes([self.address, self.control]) + self.length)
 
     def type_name(self):
         return RFCOMM_FRAME_TYPE_NAMES[self.type]
 
     @staticmethod
     def parse_mcc(data):
-        type = data[0] >> 2
+        mcc_type = data[0] >> 2
         c_r = (data[0] >> 1) & 1
         length = data[1]
         if data[1] & 1:
@@ -146,11 +151,14 @@ class RFCOMM_Frame:
             length = (data[3] << 7) & (length >> 1)
             value = data[3 : 3 + length]
 
-        return (type, c_r, value)
+        return (mcc_type, c_r, value)
 
     @staticmethod
-    def make_mcc(type, c_r, data):
-        return bytes([(type << 2 | c_r << 1 | 1) & 0xFF, (len(data) & 0x7F) << 1 | 1]) + data
+    def make_mcc(mcc_type, c_r, data):
+        return (
+            bytes([(mcc_type << 2 | c_r << 1 | 1) & 0xFF, (len(data) & 0x7F) << 1 | 1])
+            + data
+        )
 
     @staticmethod
     def sabm(c_r, dlci):
@@ -170,14 +178,16 @@ class RFCOMM_Frame:
 
     @staticmethod
     def uih(c_r, dlci, information, p_f=0):
-        return RFCOMM_Frame(RFCOMM_UIH_FRAME, c_r, dlci, p_f, information, with_credits = (p_f == 1))
+        return RFCOMM_Frame(
+            RFCOMM_UIH_FRAME, c_r, dlci, p_f, information, with_credits=(p_f == 1)
+        )
 
     @staticmethod
     def from_bytes(data):
         # Extract fields
         dlci = (data[0] >> 2) & 0x3F
         c_r = (data[0] >> 1) & 0x01
-        type = data[1] & 0xEF
+        frame_type = data[1] & 0xEF
         p_f = (data[1] >> 4) & 0x01
         length = data[2]
         if length & 0x01:
@@ -189,23 +199,44 @@ class RFCOMM_Frame:
         fcs = data[-1]
 
         # Construct the frame and check the CRC
-        frame = RFCOMM_Frame(type, c_r, dlci, p_f, information)
+        frame = RFCOMM_Frame(frame_type, c_r, dlci, p_f, information)
         if frame.fcs != fcs:
-            logger.warn(f'FCS mismatch: got {fcs:02X}, expected {frame.fcs:02X}')
+            logger.warning(f'FCS mismatch: got {fcs:02X}, expected {frame.fcs:02X}')
             raise ValueError('fcs mismatch')
 
         return frame
 
     def __bytes__(self):
-        return bytes([self.address, self.control]) + self.length + self.information + bytes([self.fcs])
+        return (
+            bytes([self.address, self.control])
+            + self.length
+            + self.information
+            + bytes([self.fcs])
+        )
 
     def __str__(self):
-        return f'{color(self.type_name(), "yellow")}(c/r={self.c_r},dlci={self.dlci},p/f={self.p_f},length={len(self.information)},fcs=0x{self.fcs:02X})'
+        return (
+            f'{color(self.type_name(), "yellow")}'
+            f'(c/r={self.c_r},'
+            f'dlci={self.dlci},'
+            f'p/f={self.p_f},'
+            f'length={len(self.information)},'
+            f'fcs=0x{self.fcs:02X})'
+        )
 
 
 # -----------------------------------------------------------------------------
 class RFCOMM_MCC_PN:
-    def __init__(self, dlci, cl, priority, ack_timer, max_frame_size, max_retransmissions, window_size):
+    def __init__(
+        self,
+        dlci,
+        cl,
+        priority,
+        ack_timer,
+        max_frame_size,
+        max_retransmissions,
+        window_size,
+    ):
         self.dlci = dlci
         self.cl = cl
         self.priority = priority
@@ -223,11 +254,12 @@ class RFCOMM_MCC_PN:
             ack_timer=data[3],
             max_frame_size=data[4] | data[5] << 8,
             max_retransmissions=data[6],
-            window_size         = data[7]
+            window_size=data[7],
         )
 
     def __bytes__(self):
-        return bytes([
+        return bytes(
+            [
                 self.dlci & 0xFF,
                 self.cl & 0xFF,
                 self.priority & 0xFF,
@@ -235,11 +267,20 @@ class RFCOMM_MCC_PN:
                 self.max_frame_size & 0xFF,
                 (self.max_frame_size >> 8) & 0xFF,
                 self.max_retransmissions & 0xFF,
-            self.window_size & 0xFF
-        ])
+                self.window_size & 0xFF,
+            ]
+        )
 
     def __str__(self):
-        return f'PN(dlci={self.dlci},cl={self.cl},priority={self.priority},ack_timer={self.ack_timer},max_frame_size={self.max_frame_size},max_retransmissions={self.max_retransmissions},window_size={self.window_size})'
+        return (
+            f'PN(dlci={self.dlci},'
+            f'cl={self.cl},'
+            f'priority={self.priority},'
+            f'ack_timer={self.ack_timer},'
+            f'max_frame_size={self.max_frame_size},'
+            f'max_retransmissions={self.max_retransmissions},'
+            f'window_size={self.window_size})'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -260,17 +301,31 @@ class RFCOMM_MCC_MSC:
             rtc=data[1] >> 2 & 1,
             rtr=data[1] >> 3 & 1,
             ic=data[1] >> 6 & 1,
-            dv   = data[1] >> 7 & 1
+            dv=data[1] >> 7 & 1,
         )
 
     def __bytes__(self):
-        return bytes([
+        return bytes(
+            [
                 (self.dlci << 2) | 3,
-            1 | self.fc << 1 | self.rtc << 2 | self.rtr << 3 | self.ic << 6 | self.dv << 7
-        ])
+                1
+                | self.fc << 1
+                | self.rtc << 2
+                | self.rtr << 3
+                | self.ic << 6
+                | self.dv << 7,
+            ]
+        )
 
     def __str__(self):
-        return f'MSC(dlci={self.dlci},fc={self.fc},rtc={self.rtc},rtr={self.rtr},ic={self.ic},dv={self.dv})'
+        return (
+            f'MSC(dlci={self.dlci},'
+            f'fc={self.fc},'
+            f'rtc={self.rtc},'
+            f'rtr={self.rtr},'
+            f'ic={self.ic},'
+            f'dv={self.dv})'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -289,7 +344,7 @@ class DLC(EventEmitter):
         CONNECTED: 'CONNECTED',
         DISCONNECTING: 'DISCONNECTING',
         DISCONNECTED: 'DISCONNECTED',
-        RESET:         'RESET'
+        RESET: 'RESET',
     }
 
     def __init__(self, multiplexer, dlci, max_frame_size, initial_tx_credits):
@@ -304,17 +359,22 @@ class DLC(EventEmitter):
         self.role = multiplexer.role
         self.c_r = 1 if self.role == Multiplexer.INITIATOR else 0
         self.sink = None
+        self.connection_result = None
 
         # Compute the MTU
         max_overhead = 4 + 1  # header with 2-byte length + fcs
-        self.mtu = min(max_frame_size, self.multiplexer.l2cap_channel.mtu - max_overhead)
+        self.mtu = min(
+            max_frame_size, self.multiplexer.l2cap_channel.mtu - max_overhead
+        )
 
     @staticmethod
     def state_name(state):
         return DLC.STATE_NAMES[state]
 
     def change_state(self, new_state):
-        logger.debug(f'{self} state change -> {color(self.state_name(new_state), "magenta")}')
+        logger.debug(
+            f'{self} state change -> {color(self.state_name(new_state), "magenta")}'
+        )
         self.state = new_state
 
     def send_frame(self, frame):
@@ -324,58 +384,40 @@ class DLC(EventEmitter):
         handler = getattr(self, f'on_{frame.type_name()}_frame'.lower())
         handler(frame)
 
-    def on_sabm_frame(self, frame):
+    def on_sabm_frame(self, _frame):
         if self.state != DLC.CONNECTING:
-            logger.warn(color('!!! received SABM when not in CONNECTING state', 'red'))
+            logger.warning(
+                color('!!! received SABM when not in CONNECTING state', 'red')
+            )
             return
 
         self.send_frame(RFCOMM_Frame.ua(c_r=1 - self.c_r, dlci=self.dlci))
 
         # Exchange the modem status with the peer
-        msc = RFCOMM_MCC_MSC(
-            dlci = self.dlci,
-            fc   = 0,
-            rtc  = 1,
-            rtr  = 1,
-            ic   = 0,
-            dv   = 1
+        msc = RFCOMM_MCC_MSC(dlci=self.dlci, fc=0, rtc=1, rtr=1, ic=0, dv=1)
+        mcc = RFCOMM_Frame.make_mcc(
+            mcc_type=RFCOMM_MCC_MSC_TYPE, c_r=1, data=bytes(msc)
         )
-        mcc = RFCOMM_Frame.make_mcc(type = RFCOMM_MCC_MSC_TYPE, c_r = 1, data = bytes(msc))
         logger.debug(f'>>> MCC MSC Command: {msc}')
-        self.send_frame(
-            RFCOMM_Frame.uih(
-                c_r         = self.c_r,
-                dlci        = 0,
-                information = mcc
-            )
-        )
+        self.send_frame(RFCOMM_Frame.uih(c_r=self.c_r, dlci=0, information=mcc))
 
         self.change_state(DLC.CONNECTED)
         self.emit('open')
 
-    def on_ua_frame(self, frame):
+    def on_ua_frame(self, _frame):
         if self.state != DLC.CONNECTING:
-            logger.warn(color('!!! received SABM when not in CONNECTING state', 'red'))
+            logger.warning(
+                color('!!! received SABM when not in CONNECTING state', 'red')
+            )
             return
 
         # Exchange the modem status with the peer
-        msc = RFCOMM_MCC_MSC(
-            dlci = self.dlci,
-            fc   = 0,
-            rtc  = 1,
-            rtr  = 1,
-            ic   = 0,
-            dv   = 1
+        msc = RFCOMM_MCC_MSC(dlci=self.dlci, fc=0, rtc=1, rtr=1, ic=0, dv=1)
+        mcc = RFCOMM_Frame.make_mcc(
+            mcc_type=RFCOMM_MCC_MSC_TYPE, c_r=1, data=bytes(msc)
         )
-        mcc = RFCOMM_Frame.make_mcc(type = RFCOMM_MCC_MSC_TYPE, c_r = 1, data = bytes(msc))
         logger.debug(f'>>> MCC MSC Command: {msc}')
-        self.send_frame(
-            RFCOMM_Frame.uih(
-                c_r         = self.c_r,
-                dlci        = 0,
-                information = mcc
-            )
-        )
+        self.send_frame(RFCOMM_Frame.uih(c_r=self.c_r, dlci=0, information=mcc))
 
         self.change_state(DLC.CONNECTED)
         self.multiplexer.on_dlc_open_complete(self)
@@ -384,7 +426,7 @@ class DLC(EventEmitter):
         # TODO: handle all states
         pass
 
-    def on_disc_frame(self, frame):
+    def on_disc_frame(self, _frame):
         # TODO: handle all states
         self.send_frame(RFCOMM_Frame.ua(c_r=1 - self.c_r, dlci=self.dlci))
 
@@ -392,21 +434,28 @@ class DLC(EventEmitter):
         data = frame.information
         if frame.p_f == 1:
             # With credits
-            credits = frame.information[0]
-            self.tx_credits += credits
+            received_credits = frame.information[0]
+            self.tx_credits += received_credits
 
-            logger.debug(f'<<< Credits [{self.dlci}]: received {credits}, total={self.tx_credits}')
+            logger.debug(
+                f'<<< Credits [{self.dlci}]: '
+                f'received {credits}, total={self.tx_credits}'
+            )
             data = data[1:]
 
-        logger.debug(f'{color("<<< Data", "yellow")} [{self.dlci}] {len(data)} bytes, rx_credits={self.rx_credits}: {data.hex()}')
+        logger.debug(
+            f'{color("<<< Data", "yellow")} '
+            f'[{self.dlci}] {len(data)} bytes, '
+            f'rx_credits={self.rx_credits}: {data.hex()}'
+        )
         if len(data) and self.sink:
-            self.sink(data)
+            self.sink(data)  # pylint: disable=not-callable
 
         # Update the credits
         if self.rx_credits > 0:
             self.rx_credits -= 1
         else:
-            logger.warn(color('!!! received frame with no rx credits', 'red'))
+            logger.warning(color('!!! received frame with no rx credits', 'red'))
 
         # Check if there's anything to send (including credits)
         self.process_tx()
@@ -418,42 +467,26 @@ class DLC(EventEmitter):
         if c_r:
             # Command
             logger.debug(f'<<< MCC MSC Command: {msc}')
-            msc = RFCOMM_MCC_MSC(
-                dlci = self.dlci,
-                fc   = 0,
-                rtc  = 1,
-                rtr  = 1,
-                ic   = 0,
-                dv   = 1
+            msc = RFCOMM_MCC_MSC(dlci=self.dlci, fc=0, rtc=1, rtr=1, ic=0, dv=1)
+            mcc = RFCOMM_Frame.make_mcc(
+                mcc_type=RFCOMM_MCC_MSC_TYPE, c_r=0, data=bytes(msc)
             )
-            mcc = RFCOMM_Frame.make_mcc(type = RFCOMM_MCC_MSC_TYPE, c_r = 0, data = bytes(msc))
             logger.debug(f'>>> MCC MSC Response: {msc}')
-            self.send_frame(
-                RFCOMM_Frame.uih(
-                    c_r         = self.c_r,
-                    dlci        = 0,
-                    information = mcc
-                )
-            )
+            self.send_frame(RFCOMM_Frame.uih(c_r=self.c_r, dlci=0, information=mcc))
         else:
             # Response
             logger.debug(f'<<< MCC MSC Response: {msc}')
 
     def connect(self):
-        if not self.state == DLC.INIT:
+        if self.state != DLC.INIT:
             raise InvalidStateError('invalid state')
 
         self.change_state(DLC.CONNECTING)
         self.connection_result = asyncio.get_running_loop().create_future()
-        self.send_frame(
-            RFCOMM_Frame.sabm(
-                c_r  = self.c_r,
-                dlci = self.dlci
-            )
-        )
+        self.send_frame(RFCOMM_Frame.sabm(c_r=self.c_r, dlci=self.dlci))
 
     def accept(self):
-        if not self.state == DLC.INIT:
+        if self.state != DLC.INIT:
             raise InvalidStateError('invalid state')
 
         pn = RFCOMM_MCC_PN(
@@ -463,23 +496,17 @@ class DLC(EventEmitter):
             ack_timer=0,
             max_frame_size=RFCOMM_DEFAULT_PREFERRED_MTU,
             max_retransmissions=0,
-            window_size         = RFCOMM_DEFAULT_INITIAL_RX_CREDITS
+            window_size=RFCOMM_DEFAULT_INITIAL_RX_CREDITS,
         )
-        mcc = RFCOMM_Frame.make_mcc(type = RFCOMM_MCC_PN_TYPE, c_r = 0, data = bytes(pn))
+        mcc = RFCOMM_Frame.make_mcc(mcc_type=RFCOMM_MCC_PN_TYPE, c_r=0, data=bytes(pn))
         logger.debug(f'>>> PN Response: {pn}')
-        self.send_frame(
-            RFCOMM_Frame.uih(
-                c_r         = self.c_r,
-                dlci        = 0,
-                information = mcc
-            )
-        )
+        self.send_frame(RFCOMM_Frame.uih(c_r=self.c_r, dlci=0, information=mcc))
         self.change_state(DLC.CONNECTING)
 
     def rx_credits_needed(self):
         if self.rx_credits <= self.rx_threshold:
             return RFCOMM_DEFAULT_INITIAL_RX_CREDITS - self.rx_credits
-        else:
+
         return 0
 
     def process_tx(self):
@@ -491,7 +518,7 @@ class DLC(EventEmitter):
                 chunk = bytes([rx_credits_needed]) + self.tx_buffer[: self.mtu - 1]
                 self.tx_buffer = self.tx_buffer[len(chunk) - 1 :]
                 self.rx_credits += rx_credits_needed
-                tx_credit_spent = (len(chunk) > 1)
+                tx_credit_spent = len(chunk) > 1
             else:
                 chunk = self.tx_buffer[: self.mtu]
                 self.tx_buffer = self.tx_buffer[len(chunk) :]
@@ -503,13 +530,17 @@ class DLC(EventEmitter):
                 self.tx_credits -= 1
 
             # Send the frame
-            logger.debug(f'>>> sending {len(chunk)} bytes with {rx_credits_needed} credits, rx_credits={self.rx_credits}, tx_credits={self.tx_credits}')
+            logger.debug(
+                f'>>> sending {len(chunk)} bytes with {rx_credits_needed} credits, '
+                f'rx_credits={self.rx_credits}, '
+                f'tx_credits={self.tx_credits}'
+            )
             self.send_frame(
                 RFCOMM_Frame.uih(
                     c_r=self.c_r,
                     dlci=self.dlci,
                     information=chunk,
-                    p_f          = 1 if rx_credits_needed > 0 else 0
+                    p_f=1 if rx_credits_needed > 0 else 0,
                 )
             )
 
@@ -518,8 +549,8 @@ class DLC(EventEmitter):
     # Stream protocol
     def write(self, data):
         # We can only send bytes
-        if type(data) != bytes:
-            if type(data) == str:
+        if not isinstance(data, bytes):
+            if isinstance(data, str):
                 # Automatically convert strings to bytes using UTF-8
                 data = data.encode('utf-8')
             else:
@@ -558,7 +589,7 @@ class Multiplexer(EventEmitter):
         OPENING: 'OPENING',
         DISCONNECTING: 'DISCONNECTING',
         DISCONNECTED: 'DISCONNECTED',
-        RESET:         'RESET'
+        RESET: 'RESET',
     }
 
     def __init__(self, l2cap_channel, role):
@@ -580,7 +611,9 @@ class Multiplexer(EventEmitter):
         return Multiplexer.STATE_NAMES[state]
 
     def change_state(self, new_state):
-        logger.debug(f'{self} state change -> {color(self.state_name(new_state), "cyan")}')
+        logger.debug(
+            f'{self} state change -> {color(self.state_name(new_state), "cyan")}'
+        )
         self.state = new_state
 
     def send_frame(self, frame):
@@ -596,14 +629,14 @@ class Multiplexer(EventEmitter):
             self.on_frame(frame)
         else:
             if frame.type == RFCOMM_DM_FRAME:
-                # DM responses are for a DLCI, but since we only create the dlc when we receive
-                # a PN response (because we need the parameters), we handle DM frames at the Multiplexer
-                # level
+                # DM responses are for a DLCI, but since we only create the dlc when we
+                # receive a PN response (because we need the parameters), we handle DM
+                # frames at the Multiplexer level
                 self.on_dm_frame(frame)
             else:
                 dlc = self.dlcs.get(frame.dlci)
                 if dlc is None:
-                    logger.warn(f'no dlc for DLCI {frame.dlci}')
+                    logger.warning(f'no dlc for DLCI {frame.dlci}')
                     return
                 dlc.on_frame(frame)
 
@@ -611,14 +644,14 @@ class Multiplexer(EventEmitter):
         handler = getattr(self, f'on_{frame.type_name()}_frame'.lower())
         handler(frame)
 
-    def on_sabm_frame(self, frame):
+    def on_sabm_frame(self, _frame):
         if self.state != Multiplexer.INIT:
             logger.debug('not in INIT state, ignoring SABM')
             return
         self.change_state(Multiplexer.CONNECTED)
         self.send_frame(RFCOMM_Frame.ua(c_r=1, dlci=0))
 
-    def on_ua_frame(self, frame):
+    def on_ua_frame(self, _frame):
         if self.state == Multiplexer.CONNECTING:
             self.change_state(Multiplexer.CONNECTED)
             if self.connection_result:
@@ -630,30 +663,34 @@ class Multiplexer(EventEmitter):
                 self.disconnection_result.set_result(None)
                 self.disconnection_result = None
 
-    def on_dm_frame(self, frame):
+    def on_dm_frame(self, _frame):
         if self.state == Multiplexer.OPENING:
             self.change_state(Multiplexer.CONNECTED)
             if self.open_result:
-                self.open_result.set_exception(ConnectionError(
-                    ConnectionError.CONNECTION_REFUSED,
+                self.open_result.set_exception(
+                    core.ConnectionError(
+                        core.ConnectionError.CONNECTION_REFUSED,
                         BT_BR_EDR_TRANSPORT,
                         self.l2cap_channel.connection.peer_address,
-                    'rfcomm'
-                ))
+                        'rfcomm',
+                    )
+                )
         else:
-            logger.warn(f'unexpected state for DM: {self}')
+            logger.warning(f'unexpected state for DM: {self}')
 
-    def on_disc_frame(self, frame):
+    def on_disc_frame(self, _frame):
         self.change_state(Multiplexer.DISCONNECTED)
-        self.send_frame(RFCOMM_Frame.ua(c_r = 0 if self.role == Multiplexer.INITIATOR else 1, dlci = 0))
+        self.send_frame(
+            RFCOMM_Frame.ua(c_r=0 if self.role == Multiplexer.INITIATOR else 1, dlci=0)
+        )
 
     def on_uih_frame(self, frame):
-        (type, c_r, value) = RFCOMM_Frame.parse_mcc(frame.information)
+        (mcc_type, c_r, value) = RFCOMM_Frame.parse_mcc(frame.information)
 
-        if type == RFCOMM_MCC_PN_TYPE:
+        if mcc_type == RFCOMM_MCC_PN_TYPE:
             pn = RFCOMM_MCC_PN.from_bytes(value)
             self.on_mcc_pn(c_r, pn)
-        elif type == RFCOMM_MCC_MSC_TYPE:
+        elif mcc_type == RFCOMM_MCC_MSC_TYPE:
             mcs = RFCOMM_MCC_MSC.from_bytes(value)
             self.on_mcc_msc(c_r, mcs)
 
@@ -669,7 +706,7 @@ class Multiplexer(EventEmitter):
             if pn.dlci & 1:
                 # Not expected, this is an initiator-side number
                 # TODO: error out
-                logger.warn(f'invalid DLCI: {pn.dlci}')
+                logger.warning(f'invalid DLCI: {pn.dlci}')
             else:
                 if self.acceptor:
                     channel_number = pn.dlci >> 1
@@ -688,7 +725,7 @@ class Multiplexer(EventEmitter):
                         self.send_frame(RFCOMM_Frame.dm(c_r=1, dlci=pn.dlci))
                 else:
                     # No acceptor?? shouldn't happen
-                    logger.warn(color('!!! no acceptor registered', 'red'))
+                    logger.warning(color('!!! no acceptor registered', 'red'))
         else:
             # Response
             logger.debug(f'>>> PN Response: {pn}')
@@ -697,12 +734,12 @@ class Multiplexer(EventEmitter):
                 self.dlcs[pn.dlci] = dlc
                 dlc.connect()
             else:
-                logger.warn('ignoring PN response')
+                logger.warning('ignoring PN response')
 
     def on_mcc_msc(self, c_r, msc):
         dlc = self.dlcs.get(msc.dlci)
         if dlc is None:
-            logger.warn(f'no dlc for DLCI {msc.dlci}')
+            logger.warning(f'no dlc for DLCI {msc.dlci}')
             return
         dlc.on_mcc_msc(c_r, msc)
 
@@ -721,14 +758,18 @@ class Multiplexer(EventEmitter):
 
         self.disconnection_result = asyncio.get_running_loop().create_future()
         self.change_state(Multiplexer.DISCONNECTING)
-        self.send_frame(RFCOMM_Frame.disc(c_r = 1 if self.role == Multiplexer.INITIATOR else 0, dlci = 0))
+        self.send_frame(
+            RFCOMM_Frame.disc(
+                c_r=1 if self.role == Multiplexer.INITIATOR else 0, dlci=0
+            )
+        )
         await self.disconnection_result
 
     async def open_dlc(self, channel):
         if self.state != Multiplexer.CONNECTED:
             if self.state == Multiplexer.OPENING:
                 raise InvalidStateError('open already in progress')
-            else:
+
             raise InvalidStateError('not connected')
 
         pn = RFCOMM_MCC_PN(
@@ -738,9 +779,9 @@ class Multiplexer(EventEmitter):
             ack_timer=0,
             max_frame_size=RFCOMM_DEFAULT_PREFERRED_MTU,
             max_retransmissions=0,
-            window_size         = RFCOMM_DEFAULT_INITIAL_RX_CREDITS
+            window_size=RFCOMM_DEFAULT_INITIAL_RX_CREDITS,
         )
-        mcc = RFCOMM_Frame.make_mcc(type = RFCOMM_MCC_PN_TYPE, c_r = 1, data = bytes(pn))
+        mcc = RFCOMM_Frame.make_mcc(mcc_type=RFCOMM_MCC_PN_TYPE, c_r=1, data=bytes(pn))
         logger.debug(f'>>> Sending MCC: {pn}')
         self.open_result = asyncio.get_running_loop().create_future()
         self.change_state(Multiplexer.OPENING)
@@ -748,7 +789,7 @@ class Multiplexer(EventEmitter):
             RFCOMM_Frame.uih(
                 c_r=1 if self.role == Multiplexer.INITIATOR else 0,
                 dlci=0,
-                information = mcc
+                information=mcc,
             )
         )
         result = await self.open_result
@@ -776,9 +817,11 @@ class Client:
     async def start(self):
         # Create a new L2CAP connection
         try:
-            self.l2cap_channel = await self.device.l2cap_channel_manager.connect(self.connection, RFCOMM_PSM)
+            self.l2cap_channel = await self.device.l2cap_channel_manager.connect(
+                self.connection, RFCOMM_PSM
+            )
         except ProtocolError as error:
-            logger.warn(f'L2CAP connection failed: {error}')
+            logger.warning(f'L2CAP connection failed: {error}')
             raise
 
         # Create a mutliplexer to manage DLCs with the server
@@ -811,7 +854,9 @@ class Server(EventEmitter):
 
     def listen(self, acceptor):
         # Find a free channel number
-        for channel in range(RFCOMM_DYNAMIC_CHANNEL_NUMBER_START, RFCOMM_DYNAMIC_CHANNEL_NUMBER_END + 1):
+        for channel in range(
+            RFCOMM_DYNAMIC_CHANNEL_NUMBER_START, RFCOMM_DYNAMIC_CHANNEL_NUMBER_END + 1
+        ):
             if channel not in self.acceptors:
                 self.acceptors[channel] = acceptor
                 return channel

bumble/sdp.py

@@ -15,10 +15,12 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 import logging
 import struct
 from colors import color
 import colors
+from typing import Dict, Type
 
 from . import core
 from .core import InvalidStateError
@@ -33,6 +35,9 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
+# fmt: off
+# pylint: disable=line-too-long
+
 SDP_CONTINUATION_WATCHDOG = 64  # Maximum number of continuations we're willing to do
 
 SDP_PSM = 0x0001
@@ -112,6 +117,10 @@ SDP_PUBLIC_BROWSE_ROOT = core.UUID.from_16_bits(0x1002, 'PublicBrowseRoot')
 # To be used in searches where an attribute ID list allows a range to be specified
 SDP_ALL_ATTRIBUTES_RANGE = (0x0000FFFF, 4)  # Express this as tuple so we can convey the desired encoding size
 
+# fmt: on
+# pylint: enable=line-too-long
+# pylint: disable=invalid-name
+
 
 # -----------------------------------------------------------------------------
 class DataElement:
@@ -134,27 +143,42 @@ class DataElement:
         BOOLEAN: 'BOOLEAN',
         SEQUENCE: 'SEQUENCE',
         ALTERNATIVE: 'ALTERNATIVE',
-        URL:              'URL'
+        URL: 'URL',
     }
 
     type_constructors = {
         NIL: lambda x: DataElement(DataElement.NIL, None),
-        UNSIGNED_INTEGER: lambda x, y: DataElement(DataElement.UNSIGNED_INTEGER, DataElement.unsigned_integer_from_bytes(x), value_size=y),
-        SIGNED_INTEGER:   lambda x, y: DataElement(DataElement.SIGNED_INTEGER, DataElement.signed_integer_from_bytes(x), value_size=y),
-        UUID:             lambda x: DataElement(DataElement.UUID, core.UUID.from_bytes(bytes(reversed(x)))),
+        UNSIGNED_INTEGER: lambda x, y: DataElement(
+            DataElement.UNSIGNED_INTEGER,
+            DataElement.unsigned_integer_from_bytes(x),
+            value_size=y,
+        ),
+        SIGNED_INTEGER: lambda x, y: DataElement(
+            DataElement.SIGNED_INTEGER,
+            DataElement.signed_integer_from_bytes(x),
+            value_size=y,
+        ),
+        UUID: lambda x: DataElement(
+            DataElement.UUID, core.UUID.from_bytes(bytes(reversed(x)))
+        ),
         TEXT_STRING: lambda x: DataElement(DataElement.TEXT_STRING, x.decode('utf8')),
         BOOLEAN: lambda x: DataElement(DataElement.BOOLEAN, x[0] == 1),
-        SEQUENCE:         lambda x: DataElement(DataElement.SEQUENCE, DataElement.list_from_bytes(x)),
-        ALTERNATIVE:      lambda x: DataElement(DataElement.ALTERNATIVE, DataElement.list_from_bytes(x)),
-        URL:              lambda x: DataElement(DataElement.URL, x.decode('utf8'))
+        SEQUENCE: lambda x: DataElement(
+            DataElement.SEQUENCE, DataElement.list_from_bytes(x)
+        ),
+        ALTERNATIVE: lambda x: DataElement(
+            DataElement.ALTERNATIVE, DataElement.list_from_bytes(x)
+        ),
+        URL: lambda x: DataElement(DataElement.URL, x.decode('utf8')),
     }
 
-    def __init__(self, type, value, value_size=None):
-        self.type       = type
+    def __init__(self, element_type, value, value_size=None):
+        self.type = element_type
         self.value = value
         self.value_size = value_size
-        self.bytes      = None  # Used a cache when parsing from bytes so we can emit a byte-for-byte replica
-        if type == DataElement.UNSIGNED_INTEGER or type == DataElement.SIGNED_INTEGER:
+        # Used as a cache when parsing from bytes so we can emit a byte-for-byte replica
+        self.bytes = None
+        if element_type in (DataElement.UNSIGNED_INTEGER, DataElement.SIGNED_INTEGER):
             if value_size is None:
                 raise ValueError('integer types must have a value size specified')
 
@@ -222,26 +246,32 @@ class DataElement:
     def unsigned_integer_from_bytes(data):
         if len(data) == 1:
             return data[0]
-        elif len(data) == 2:
+
+        if len(data) == 2:
             return struct.unpack('>H', data)[0]
-        elif len(data) == 4:
+
+        if len(data) == 4:
             return struct.unpack('>I', data)[0]
-        elif len(data) == 8:
+
+        if len(data) == 8:
             return struct.unpack('>Q', data)[0]
-        else:
+
         raise ValueError(f'invalid integer length {len(data)}')
 
     @staticmethod
     def signed_integer_from_bytes(data):
         if len(data) == 1:
             return struct.unpack('b', data)[0]
-        elif len(data) == 2:
+
+        if len(data) == 2:
             return struct.unpack('>h', data)[0]
-        elif len(data) == 4:
+
+        if len(data) == 4:
             return struct.unpack('>i', data)[0]
-        elif len(data) == 8:
+
+        if len(data) == 8:
             return struct.unpack('>q', data)[0]
-        else:
+
         raise ValueError(f'invalid integer length {len(data)}')
 
     @staticmethod
@@ -260,11 +290,11 @@ class DataElement:
 
     @staticmethod
     def from_bytes(data):
-        type = data[0] >> 3
+        element_type = data[0] >> 3
         size_index = data[0] & 7
         value_offset = 0
         if size_index == 0:
-            if type == DataElement.NIL:
+            if element_type == DataElement.NIL:
                 value_size = 0
             else:
                 value_size = 1
@@ -287,15 +317,20 @@ class DataElement:
             value_offset = 4
 
         value_data = data[1 + value_offset : 1 + value_offset + value_size]
-        constructor = DataElement.type_constructors.get(type)
+        constructor = DataElement.type_constructors.get(element_type)
         if constructor:
-            if type == DataElement.UNSIGNED_INTEGER or type == DataElement.SIGNED_INTEGER:
+            if element_type in (
+                DataElement.UNSIGNED_INTEGER,
+                DataElement.SIGNED_INTEGER,
+            ):
                 result = constructor(value_data, value_size)
             else:
                 result = constructor(value_data)
         else:
-            result = DataElement(type, value_data)
-        result.bytes = data[:1 + value_offset + value_size]  # Keep a copy so we can re-serialize to an exact replica
+            result = DataElement(element_type, value_data)
+        result.bytes = data[
+            : 1 + value_offset + value_size
+        ]  # Keep a copy so we can re-serialize to an exact replica
         return result
 
     def to_bytes(self):
@@ -311,7 +346,8 @@ class DataElement:
         elif self.type == DataElement.UNSIGNED_INTEGER:
             if self.value < 0:
                 raise ValueError('UNSIGNED_INTEGER cannot be negative')
-            elif self.value_size == 1:
+
+            if self.value_size == 1:
                 data = struct.pack('B', self.value)
             elif self.value_size == 2:
                 data = struct.pack('>H', self.value)
@@ -334,11 +370,11 @@ class DataElement:
                 raise ValueError('invalid value_size')
         elif self.type == DataElement.UUID:
             data = bytes(reversed(bytes(self.value)))
-        elif self.type == DataElement.TEXT_STRING or self.type == DataElement.URL:
+        elif self.type in (DataElement.TEXT_STRING, DataElement.URL):
             data = self.value.encode('utf8')
         elif self.type == DataElement.BOOLEAN:
             data = bytes([1 if self.value else 0])
-        elif self.type == DataElement.SEQUENCE or self.type == DataElement.ALTERNATIVE:
+        elif self.type in (DataElement.SEQUENCE, DataElement.ALTERNATIVE):
             data = b''.join([bytes(element) for element in self.value])
         else:
             data = self.value
@@ -349,9 +385,11 @@ class DataElement:
             if size != 0:
                 raise ValueError('NIL must be empty')
             size_index = 0
-        elif (self.type == DataElement.UNSIGNED_INTEGER or
-              self.type == DataElement.SIGNED_INTEGER or
-              self.type == DataElement.UUID):
+        elif self.type in (
+            DataElement.UNSIGNED_INTEGER,
+            DataElement.SIGNED_INTEGER,
+            DataElement.UUID,
+        ):
             if size <= 1:
                 size_index = 0
             elif size == 2:
@@ -364,10 +402,12 @@ class DataElement:
                 size_index = 4
             else:
                 raise ValueError('invalid data size')
-        elif (self.type == DataElement.TEXT_STRING or
-              self.type == DataElement.SEQUENCE or
-              self.type == DataElement.ALTERNATIVE or
-              self.type == DataElement.URL):
+        elif self.type in (
+            DataElement.TEXT_STRING,
+            DataElement.SEQUENCE,
+            DataElement.ALTERNATIVE,
+            DataElement.URL,
+        ):
             if size <= 0xFF:
                 size_index = 5
                 size_bytes = bytes([size])
@@ -392,11 +432,19 @@ class DataElement:
         type_name = name_or_number(self.TYPE_NAMES, self.type)
         if self.type == DataElement.NIL:
             value_string = ''
-        elif self.type == DataElement.SEQUENCE or self.type == DataElement.ALTERNATIVE:
+        elif self.type in (DataElement.SEQUENCE, DataElement.ALTERNATIVE):
             container_separator = '\n' if pretty else ''
             element_separator = '\n' if pretty else ','
-            value_string = f'[{container_separator}{element_separator.join([element.to_string(pretty, indentation + 1 if pretty else 0) for element in self.value])}{container_separator}{prefix}]'
-        elif self.type == DataElement.UNSIGNED_INTEGER or self.type == DataElement.SIGNED_INTEGER:
+            elements = [
+                element.to_string(pretty, indentation + 1 if pretty else 0)
+                for element in self.value
+            ]
+            value_string = (
+                f'[{container_separator}'
+                f'{element_separator.join(elements)}'
+                f'{container_separator}{prefix}]'
+            )
+        elif self.type in (DataElement.UNSIGNED_INTEGER, DataElement.SIGNED_INTEGER):
             value_string = f'{self.value}#{self.value_size}'
         elif isinstance(self.value, DataElement):
             value_string = self.value.to_string(pretty, indentation)
@@ -410,8 +458,8 @@ class DataElement:
 
 # -----------------------------------------------------------------------------
 class ServiceAttribute:
-    def __init__(self, id, value):
-        self.id    = id
+    def __init__(self, attribute_id, value):
+        self.id = attribute_id
         self.value = value
 
     @staticmethod
@@ -420,7 +468,7 @@ class ServiceAttribute:
         for i in range(0, len(elements) // 2):
             attribute_id, attribute_value = elements[2 * i : 2 * (i + 1)]
             if attribute_id.type != DataElement.UNSIGNED_INTEGER:
-                logger.warn('attribute ID element is not an integer')
+                logger.warning('attribute ID element is not an integer')
                 continue
             attribute_list.append(ServiceAttribute(attribute_id.value, attribute_value))
 
@@ -428,29 +476,40 @@ class ServiceAttribute:
 
     @staticmethod
     def find_attribute_in_list(attribute_list, attribute_id):
-        return next((attribute.value for attribute in attribute_list if attribute.id == attribute_id), None)
+        return next(
+            (
+                attribute.value
+                for attribute in attribute_list
+                if attribute.id == attribute_id
+            ),
+            None,
+        )
 
     @staticmethod
-    def id_name(id):
-        return name_or_number(SDP_ATTRIBUTE_ID_NAMES, id)
+    def id_name(id_code):
+        return name_or_number(SDP_ATTRIBUTE_ID_NAMES, id_code)
 
     @staticmethod
     def is_uuid_in_value(uuid, value):
         # Find if a uuid matches a value, either directly or recursing into sequences
         if value.type == DataElement.UUID:
             return value.value == uuid
-        elif value.type == DataElement.SEQUENCE:
+
+        if value.type == DataElement.SEQUENCE:
             for element in value.value:
                 if ServiceAttribute.is_uuid_in_value(uuid, element):
                     return True
             return False
-        else:
+
         return False
 
-    def to_string(self, color=False):
-        if color:
-            return f'Attribute(id={colors.color(self.id_name(self.id),"magenta")},value={self.value})'
-        else:
+    def to_string(self, with_colors=False):
+        if with_colors:
+            return (
+                f'Attribute(id={colors.color(self.id_name(self.id),"magenta")},'
+                f'value={self.value})'
+            )
+
         return f'Attribute(id={self.id_name(self.id)},value={self.value})'
 
     def __str__(self):
@@ -462,11 +521,14 @@ class SDP_PDU:
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.2 PROTOCOL DATA UNIT FORMAT
     '''
-    sdp_pdu_classes = {}
+
+    sdp_pdu_classes: Dict[int, Type[SDP_PDU]] = {}
+    name = None
+    pdu_id = 0
 
     @staticmethod
     def from_bytes(pdu):
-        pdu_id, transaction_id, parameters_length = struct.unpack_from('>BHH', pdu, 0)
+        pdu_id, transaction_id, _parameters_length = struct.unpack_from('>BHH', pdu, 0)
 
         cls = SDP_PDU.sdp_pdu_classes.get(pdu_id)
         if cls is None:
@@ -484,7 +546,9 @@ class SDP_PDU:
     @staticmethod
     def parse_service_record_handle_list_preceded_by_count(data, offset):
         count = struct.unpack_from('>H', data, offset - 2)[0]
-        handle_list = [struct.unpack_from('>I', data, offset + x * 4)[0] for x in range(count)]
+        handle_list = [
+            struct.unpack_from('>I', data, offset + x * 4)[0] for x in range(count)
+        ]
         return offset + count * 4, handle_list
 
     @staticmethod
@@ -532,7 +596,10 @@ class SDP_PDU:
             HCI_Object.init_from_fields(self, self.fields, kwargs)
         if pdu is None:
             parameters = HCI_Object.dict_to_bytes(kwargs, self.fields)
-            pdu = struct.pack('>BHH', self.pdu_id, transaction_id, len(parameters)) + parameters
+            pdu = (
+                struct.pack('>BHH', self.pdu_id, transaction_id, len(parameters))
+                + parameters
+            )
         self.pdu = pdu
         self.transaction_id = transaction_id
 
@@ -555,9 +622,7 @@ class SDP_PDU:
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
-    ('error_code', {'size': 2, 'mapper': SDP_PDU.error_name})
-])
+@SDP_PDU.subclass([('error_code', {'size': 2, 'mapper': SDP_PDU.error_name})])
 class SDP_ErrorResponse(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.4.1 SDP_ErrorResponse PDU
@@ -565,11 +630,13 @@ class SDP_ErrorResponse(SDP_PDU):
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
+@SDP_PDU.subclass(
+    [
         ('service_search_pattern', DataElement.parse_from_bytes),
         ('maximum_service_record_count', '>2'),
-    ('continuation_state',          '*')
-])
+        ('continuation_state', '*'),
+    ]
+)
 class SDP_ServiceSearchRequest(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.5.1 SDP_ServiceSearchRequest PDU
@@ -577,12 +644,17 @@ class SDP_ServiceSearchRequest(SDP_PDU):
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
+@SDP_PDU.subclass(
+    [
         ('total_service_record_count', '>2'),
         ('current_service_record_count', '>2'),
-    ('service_record_handle_list',   SDP_PDU.parse_service_record_handle_list_preceded_by_count),
-    ('continuation_state',           '*')
-])
+        (
+            'service_record_handle_list',
+            SDP_PDU.parse_service_record_handle_list_preceded_by_count,
+        ),
+        ('continuation_state', '*'),
+    ]
+)
 class SDP_ServiceSearchResponse(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.5.2 SDP_ServiceSearchResponse PDU
@@ -590,12 +662,14 @@ class SDP_ServiceSearchResponse(SDP_PDU):
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
+@SDP_PDU.subclass(
+    [
         ('service_record_handle', '>4'),
         ('maximum_attribute_byte_count', '>2'),
         ('attribute_id_list', DataElement.parse_from_bytes),
-    ('continuation_state',           '*')
-])
+        ('continuation_state', '*'),
+    ]
+)
 class SDP_ServiceAttributeRequest(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.6.1 SDP_ServiceAttributeRequest PDU
@@ -603,11 +677,13 @@ class SDP_ServiceAttributeRequest(SDP_PDU):
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
+@SDP_PDU.subclass(
+    [
         ('attribute_list_byte_count', '>2'),
         ('attribute_list', SDP_PDU.parse_bytes_preceded_by_length),
-    ('continuation_state',        '*')
-])
+        ('continuation_state', '*'),
+    ]
+)
 class SDP_ServiceAttributeResponse(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.6.2 SDP_ServiceAttributeResponse PDU
@@ -615,12 +691,14 @@ class SDP_ServiceAttributeResponse(SDP_PDU):
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
+@SDP_PDU.subclass(
+    [
         ('service_search_pattern', DataElement.parse_from_bytes),
         ('maximum_attribute_byte_count', '>2'),
         ('attribute_id_list', DataElement.parse_from_bytes),
-    ('continuation_state',          '*')
-])
+        ('continuation_state', '*'),
+    ]
+)
 class SDP_ServiceSearchAttributeRequest(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.7.1 SDP_ServiceSearchAttributeRequest PDU
@@ -628,11 +706,13 @@ class SDP_ServiceSearchAttributeRequest(SDP_PDU):
 
 
 # -----------------------------------------------------------------------------
-@SDP_PDU.subclass([
+@SDP_PDU.subclass(
+    [
         ('attribute_lists_byte_count', '>2'),
         ('attribute_lists', SDP_PDU.parse_bytes_preceded_by_length),
-    ('continuation_state',        '*')
-])
+        ('continuation_state', '*'),
+    ]
+)
 class SDP_ServiceSearchAttributeResponse(SDP_PDU):
     '''
     See Bluetooth spec @ Vol 3, Part B - 4.7.2 SDP_ServiceSearchAttributeResponse PDU
@@ -659,7 +739,9 @@ class Client:
         if self.pending_request is not None:
             raise InvalidStateError('request already pending')
 
-        service_search_pattern = DataElement.sequence([DataElement.uuid(uuid) for uuid in uuids])
+        service_search_pattern = DataElement.sequence(
+            [DataElement.uuid(uuid) for uuid in uuids]
+        )
 
         # Request and accumulate until there's no more continuation
         service_record_handle_list = []
@@ -671,7 +753,7 @@ class Client:
                     transaction_id=0,  # Transaction ID TODO: pick a real value
                     service_search_pattern=service_search_pattern,
                     maximum_service_record_count=0xFFFF,
-                    continuation_state           = continuation_state
+                    continuation_state=continuation_state,
                 )
             )
             response = SDP_PDU.from_bytes(response_pdu)
@@ -689,11 +771,15 @@ class Client:
         if self.pending_request is not None:
             raise InvalidStateError('request already pending')
 
-        service_search_pattern = DataElement.sequence([DataElement.uuid(uuid) for uuid in uuids])
+        service_search_pattern = DataElement.sequence(
+            [DataElement.uuid(uuid) for uuid in uuids]
+        )
         attribute_id_list = DataElement.sequence(
             [
-                DataElement.unsigned_integer(attribute_id[0], value_size=attribute_id[1])
-                if type(attribute_id) is tuple
+                DataElement.unsigned_integer(
+                    attribute_id[0], value_size=attribute_id[1]
+                )
+                if isinstance(attribute_id, tuple)
                 else DataElement.unsigned_integer_16(attribute_id)
                 for attribute_id in attribute_ids
             ]
@@ -710,7 +796,7 @@ class Client:
                     service_search_pattern=service_search_pattern,
                     maximum_attribute_byte_count=0xFFFF,
                     attribute_id_list=attribute_id_list,
-                    continuation_state           = continuation_state
+                    continuation_state=continuation_state,
                 )
             )
             response = SDP_PDU.from_bytes(response_pdu)
@@ -725,7 +811,7 @@ class Client:
         # Parse the result into attribute lists
         attribute_lists_sequences = DataElement.from_bytes(accumulator)
         if attribute_lists_sequences.type != DataElement.SEQUENCE:
-            logger.warn('unexpected data type')
+            logger.warning('unexpected data type')
             return []
 
         return [
@@ -740,8 +826,10 @@ class Client:
 
         attribute_id_list = DataElement.sequence(
             [
-                DataElement.unsigned_integer(attribute_id[0], value_size=attribute_id[1])
-                if type(attribute_id) is tuple
+                DataElement.unsigned_integer(
+                    attribute_id[0], value_size=attribute_id[1]
+                )
+                if isinstance(attribute_id, tuple)
                 else DataElement.unsigned_integer_16(attribute_id)
                 for attribute_id in attribute_ids
             ]
@@ -758,7 +846,7 @@ class Client:
                     service_record_handle=service_record_handle,
                     maximum_attribute_byte_count=0xFFFF,
                     attribute_id_list=attribute_id_list,
-                    continuation_state           = continuation_state
+                    continuation_state=continuation_state,
                 )
             )
             response = SDP_PDU.from_bytes(response_pdu)
@@ -773,7 +861,7 @@ class Client:
         # Parse the result into a list of attributes
         attribute_list_sequence = DataElement.from_bytes(accumulator)
         if attribute_list_sequence.type != DataElement.SEQUENCE:
-            logger.warn('unexpected data type')
+            logger.warning('unexpected data type')
             return []
 
         return ServiceAttribute.list_from_data_elements(attribute_list_sequence.value)
@@ -786,6 +874,7 @@ class Server:
     def __init__(self, device):
         self.device = device
         self.service_records = {}  # Service records maps, by record handle
+        self.channel = None
         self.current_response = None
 
     def register(self, l2cap_channel_manager):
@@ -820,11 +909,10 @@ class Server:
         try:
             sdp_pdu = SDP_PDU.from_bytes(pdu)
         except Exception as error:
-            logger.warn(color(f'failed to parse SDP Request PDU: {error}', 'red'))
+            logger.warning(color(f'failed to parse SDP Request PDU: {error}', 'red'))
             self.send_response(
                 SDP_ErrorResponse(
-                    transaction_id = 0,
-                    error_code     = SDP_INVALID_REQUEST_SYNTAX_ERROR
+                    transaction_id=0, error_code=SDP_INVALID_REQUEST_SYNTAX_ERROR
                 )
             )
 
@@ -841,7 +929,7 @@ class Server:
                 self.send_response(
                     SDP_ErrorResponse(
                         transaction_id=sdp_pdu.transaction_id,
-                        error_code     = SDP_INSUFFICIENT_RESOURCES_TO_SATISFY_REQUEST_ERROR
+                        error_code=SDP_INSUFFICIENT_RESOURCES_TO_SATISFY_REQUEST_ERROR,
                     )
                 )
         else:
@@ -849,7 +937,7 @@ class Server:
             self.send_response(
                 SDP_ErrorResponse(
                     transaction_id=sdp_pdu.transaction_id,
-                    error_code     = SDP_INVALID_REQUEST_SYNTAX_ERROR
+                    error_code=SDP_INVALID_REQUEST_SYNTAX_ERROR,
                 )
             )
 
@@ -877,11 +965,12 @@ class Server:
                 id_range_start = attribute_id.value
                 id_range_end = attribute_id.value
             attributes += [
-                attribute for attribute in service
+                attribute
+                for attribute in service
                 if attribute.id >= id_range_start and attribute.id <= id_range_end
             ]
 
-        # Return the maching attributes, sorted by attribute id
+        # Return the matching attributes, sorted by attribute id
         attributes.sort(key=lambda x: x.id)
         attribute_list = DataElement.sequence([])
         for attribute in attributes:
@@ -897,7 +986,7 @@ class Server:
                 self.send_response(
                     SDP_ErrorResponse(
                         transaction_id=request.transaction_id,
-                        error_code     = SDP_INVALID_CONTINUATION_STATE_ERROR
+                        error_code=SDP_INVALID_CONTINUATION_STATE_ERROR,
                     )
                 )
                 return
@@ -910,30 +999,38 @@ class Server:
             service_record_handles = list(matching_services.keys())
 
             # Only return up to the maximum requested
-            service_record_handles_subset = service_record_handles[:request.maximum_service_record_count]
+            service_record_handles_subset = service_record_handles[
+                : request.maximum_service_record_count
+            ]
 
             # Serialize to a byte array, and remember the total count
             logger.debug(f'Service Record Handles: {service_record_handles}')
             self.current_response = (
                 len(service_record_handles),
-                service_record_handles_subset
+                service_record_handles_subset,
             )
 
         # Respond, keeping any unsent handles for later
-        service_record_handles = self.current_response[1][:request.maximum_service_record_count]
+        service_record_handles = self.current_response[1][
+            : request.maximum_service_record_count
+        ]
         self.current_response = (
             self.current_response[0],
-            self.current_response[1][request.maximum_service_record_count:]
+            self.current_response[1][request.maximum_service_record_count :],
+        )
+        continuation_state = (
+            Server.CONTINUATION_STATE if self.current_response[1] else bytes([0])
+        )
+        service_record_handle_list = b''.join(
+            [struct.pack('>I', handle) for handle in service_record_handles]
         )
-        continuation_state = Server.CONTINUATION_STATE if self.current_response[1] else bytes([0])
-        service_record_handle_list = b''.join([struct.pack('>I', handle) for handle in service_record_handles])
         self.send_response(
             SDP_ServiceSearchResponse(
                 transaction_id=request.transaction_id,
                 total_service_record_count=self.current_response[0],
                 current_service_record_count=len(service_record_handles),
                 service_record_handle_list=service_record_handle_list,
-                continuation_state           = continuation_state
+                continuation_state=continuation_state,
             )
         )
 
@@ -944,7 +1041,7 @@ class Server:
                 self.send_response(
                     SDP_ErrorResponse(
                         transaction_id=request.transaction_id,
-                        error_code     = SDP_INVALID_CONTINUATION_STATE_ERROR
+                        error_code=SDP_INVALID_CONTINUATION_STATE_ERROR,
                     )
                 )
                 return
@@ -958,26 +1055,30 @@ class Server:
                 self.send_response(
                     SDP_ErrorResponse(
                         transaction_id=request.transaction_id,
-                        error_code     = SDP_INVALID_SERVICE_RECORD_HANDLE_ERROR
+                        error_code=SDP_INVALID_SERVICE_RECORD_HANDLE_ERROR,
                     )
                 )
                 return
 
             # Get the attributes for the service
-            attribute_list = Server.get_service_attributes(service, request.attribute_id_list.value)
+            attribute_list = Server.get_service_attributes(
+                service, request.attribute_id_list.value
+            )
 
             # Serialize to a byte array
             logger.debug(f'Attributes: {attribute_list}')
             self.current_response = bytes(attribute_list)
 
         # Respond, keeping any pending chunks for later
-        attribute_list, continuation_state = self.get_next_response_payload(request.maximum_attribute_byte_count)
+        attribute_list, continuation_state = self.get_next_response_payload(
+            request.maximum_attribute_byte_count
+        )
         self.send_response(
             SDP_ServiceAttributeResponse(
                 transaction_id=request.transaction_id,
                 attribute_list_byte_count=len(attribute_list),
                 attribute_list=attribute_list,
-                continuation_state        = continuation_state
+                continuation_state=continuation_state,
             )
         )
 
@@ -988,7 +1089,7 @@ class Server:
                 self.send_response(
                     SDP_ErrorResponse(
                         transaction_id=request.transaction_id,
-                        error_code     = SDP_INVALID_CONTINUATION_STATE_ERROR
+                        error_code=SDP_INVALID_CONTINUATION_STATE_ERROR,
                     )
                 )
         else:
@@ -996,12 +1097,16 @@ class Server:
             self.current_response = None
 
             # Find the matching services
-            matching_services = self.match_services(request.service_search_pattern).values()
+            matching_services = self.match_services(
+                request.service_search_pattern
+            ).values()
 
             # Filter the required attributes
             attribute_lists = DataElement.sequence([])
             for service in matching_services:
-                attribute_list = Server.get_service_attributes(service, request.attribute_id_list.value)
+                attribute_list = Server.get_service_attributes(
+                    service, request.attribute_id_list.value
+                )
                 if attribute_list.value:
                     attribute_lists.value.append(attribute_list)
 
@@ -1010,12 +1115,14 @@ class Server:
             self.current_response = bytes(attribute_lists)
 
         # Respond, keeping any pending chunks for later
-        attribute_lists, continuation_state = self.get_next_response_payload(request.maximum_attribute_byte_count)
+        attribute_lists, continuation_state = self.get_next_response_payload(
+            request.maximum_attribute_byte_count
+        )
         self.send_response(
             SDP_ServiceSearchAttributeResponse(
                 transaction_id=request.transaction_id,
                 attribute_lists_byte_count=len(attribute_lists),
                 attribute_lists=attribute_lists,
-                continuation_state         = continuation_state
+                continuation_state=continuation_state,
             )
         )

bumble/transport/__init__.py

@@ -35,47 +35,75 @@ async def open_transport(name):
     Where <parameters> depend on the type (and may be empty for some types).
     The supported types are: serial,udp,tcp,pty,usb
     '''
+    # pylint: disable=import-outside-toplevel
+    # pylint: disable=too-many-return-statements
+
     scheme, *spec = name.split(':', 1)
     if scheme == 'serial' and spec:
         from .serial import open_serial_transport
+
         return await open_serial_transport(spec[0])
-    elif scheme == 'udp' and spec:
+
+    if scheme == 'udp' and spec:
         from .udp import open_udp_transport
+
         return await open_udp_transport(spec[0])
-    elif scheme == 'tcp-client' and spec:
+
+    if scheme == 'tcp-client' and spec:
         from .tcp_client import open_tcp_client_transport
+
         return await open_tcp_client_transport(spec[0])
-    elif scheme == 'tcp-server' and spec:
+
+    if scheme == 'tcp-server' and spec:
         from .tcp_server import open_tcp_server_transport
+
         return await open_tcp_server_transport(spec[0])
-    elif scheme == 'ws-client' and spec:
+
+    if scheme == 'ws-client' and spec:
         from .ws_client import open_ws_client_transport
+
         return await open_ws_client_transport(spec[0])
-    elif scheme == 'ws-server' and spec:
+
+    if scheme == 'ws-server' and spec:
         from .ws_server import open_ws_server_transport
+
         return await open_ws_server_transport(spec[0])
-    elif scheme == 'pty':
+
+    if scheme == 'pty':
         from .pty import open_pty_transport
+
         return await open_pty_transport(spec[0] if spec else None)
-    elif scheme == 'file':
+
+    if scheme == 'file':
         from .file import open_file_transport
+
         return await open_file_transport(spec[0] if spec else None)
-    elif scheme == 'vhci':
+
+    if scheme == 'vhci':
         from .vhci import open_vhci_transport
+
         return await open_vhci_transport(spec[0] if spec else None)
-    elif scheme == 'hci-socket':
+
+    if scheme == 'hci-socket':
         from .hci_socket import open_hci_socket_transport
+
         return await open_hci_socket_transport(spec[0] if spec else None)
-    elif scheme == 'usb':
+
+    if scheme == 'usb':
         from .usb import open_usb_transport
+
         return await open_usb_transport(spec[0] if spec else None)
-    elif scheme == 'pyusb':
+
+    if scheme == 'pyusb':
         from .pyusb import open_pyusb_transport
+
         return await open_pyusb_transport(spec[0] if spec else None)
-    elif scheme == 'android-emulator':
+
+    if scheme == 'android-emulator':
         from .android_emulator import open_android_emulator_transport
+
         return await open_android_emulator_transport(spec[0] if spec else None)
-    else:
+
     raise ValueError('unknown transport scheme')
 
 
@@ -91,5 +119,5 @@ async def open_transport_or_link(name):
                 link.close()
 
         return LinkTransport(controller, AsyncPipeSink(controller))
-    else:
+
     return await open_transport(name)

bumble/transport/android_emulator.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -20,9 +20,11 @@ import grpc
 
 from .common import PumpedTransport, PumpedPacketSource, PumpedPacketSink
 from .emulated_bluetooth_pb2_grpc import EmulatedBluetoothServiceStub
-from .emulated_bluetooth_packets_pb2 import HCIPacket
 from .emulated_bluetooth_vhci_pb2_grpc import VhciForwardingServiceStub
 
+# pylint: disable-next=no-name-in-module
+from .emulated_bluetooth_packets_pb2 import HCIPacket
+
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -59,12 +61,7 @@ async def open_android_emulator_transport(spec):
             return bytes([packet.type]) + packet.packet
 
         async def write(self, packet):
-            await self.hci_device.write(
-                HCIPacket(
-                    type   = packet[0],
-                    packet = packet[1:]
-                )
-            )
+            await self.hci_device.write(HCIPacket(type=packet[0], packet=packet[1:]))
 
     # Parse the parameters
     mode = 'host'
@@ -100,7 +97,7 @@ async def open_android_emulator_transport(spec):
     transport = PumpedTransport(
         PumpedPacketSource(hci_device.read),
         PumpedPacketSink(hci_device.write),
-        channel.close
+        channel.close,
     )
     transport.start()
 

bumble/transport/common.py

@@ -36,7 +36,7 @@ HCI_PACKET_INFO = {
     hci.HCI_COMMAND_PACKET: (1, 2, 'B'),
     hci.HCI_ACL_DATA_PACKET: (2, 2, 'H'),
     hci.HCI_SYNCHRONOUS_DATA_PACKET: (1, 2, 'B'),
-    hci.HCI_EVENT_PACKET:            (1, 1, 'B')
+    hci.HCI_EVENT_PACKET: (1, 1, 'B'),
 }
 
 
@@ -65,8 +65,12 @@ class PacketPump:
 # -----------------------------------------------------------------------------
 class PacketParser:
     '''
-    In-line parser that accepts data and emits 'on_packet' when a full packet has been parsed
+    In-line parser that accepts data and emits 'on_packet' when a full packet has been
+    parsed
     '''
+
+    # pylint: disable=attribute-defined-outside-init
+
     NEED_TYPE = 0
     NEED_LENGTH = 1
     NEED_BODY = 2
@@ -95,13 +99,17 @@ class PacketParser:
             if self.bytes_needed == 0:
                 if self.state == PacketParser.NEED_TYPE:
                     packet_type = self.packet[0]
-                    self.packet_info  = HCI_PACKET_INFO.get(packet_type) or self.extended_packet_info.get(packet_type)
+                    self.packet_info = HCI_PACKET_INFO.get(
+                        packet_type
+                    ) or self.extended_packet_info.get(packet_type)
                     if self.packet_info is None:
                         raise ValueError(f'invalid packet type {packet_type}')
                     self.state = PacketParser.NEED_LENGTH
                     self.bytes_needed = self.packet_info[0] + self.packet_info[1]
                 elif self.state == PacketParser.NEED_LENGTH:
-                    body_length = struct.unpack_from(self.packet_info[2], self.packet, 1 + self.packet_info[1])[0]
+                    body_length = struct.unpack_from(
+                        self.packet_info[2], self.packet, 1 + self.packet_info[1]
+                    )[0]
                     self.bytes_needed = body_length
                     self.state = PacketParser.NEED_BODY
 
@@ -111,7 +119,9 @@ class PacketParser:
                         try:
                             self.sink.on_packet(bytes(self.packet))
                         except Exception as error:
-                            logger.warning(color(f'!!! Exception in on_packet: {error}', 'red'))
+                            logger.warning(
+                                color(f'!!! Exception in on_packet: {error}', 'red')
+                            )
                     self.reset()
 
     def set_packet_sink(self, sink):
@@ -187,6 +197,7 @@ class AsyncPipeSink:
     '''
     Sink that forwards packets asynchronously to another sink
     '''
+
     def __init__(self, sink):
         self.sink = sink
         self.loop = asyncio.get_running_loop()
@@ -270,7 +281,7 @@ class PumpedPacketSource(ParserSource):
                     logger.debug('source pump task done')
                     break
                 except Exception as error:
-                    logger.warn(f'exception while waiting for packet: {error}')
+                    logger.warning(f'exception while waiting for packet: {error}')
                     self.terminated.set_result(error)
                     break
 
@@ -301,7 +312,7 @@ class PumpedPacketSink:
                     logger.debug('sink pump task done')
                     break
                 except Exception as error:
-                    logger.warn(f'exception while sending packet: {error}')
+                    logger.warning(f'exception while sending packet: {error}')
                     break
 
         self.pump_task = asyncio.create_task(pump_packets())

bumble/transport/emulated_bluetooth_packets_pb2.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,31 +16,24 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: emulated_bluetooth_packets.proto
 """Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
 
 
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(
+    b'\n emulated_bluetooth_packets.proto\x12\x1b\x61ndroid.emulation.bluetooth\"\xfb\x01\n\tHCIPacket\x12?\n\x04type\x18\x01 \x01(\x0e\x32\x31.android.emulation.bluetooth.HCIPacket.PacketType\x12\x0e\n\x06packet\x18\x02 \x01(\x0c\"\x9c\x01\n\nPacketType\x12\x1b\n\x17PACKET_TYPE_UNSPECIFIED\x10\x00\x12\x1b\n\x17PACKET_TYPE_HCI_COMMAND\x10\x01\x12\x13\n\x0fPACKET_TYPE_ACL\x10\x02\x12\x13\n\x0fPACKET_TYPE_SCO\x10\x03\x12\x15\n\x11PACKET_TYPE_EVENT\x10\x04\x12\x13\n\x0fPACKET_TYPE_ISO\x10\x05\x42J\n\x1f\x63om.android.emulation.bluetoothP\x01\xf8\x01\x01\xa2\x02\x03\x41\x45\x42\xaa\x02\x1b\x41ndroid.Emulation.Bluetoothb\x06proto3'
+)
 
-
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n emulated_bluetooth_packets.proto\x12\x1b\x61ndroid.emulation.bluetooth\"\xfb\x01\n\tHCIPacket\x12?\n\x04type\x18\x01 \x01(\x0e\x32\x31.android.emulation.bluetooth.HCIPacket.PacketType\x12\x0e\n\x06packet\x18\x02 \x01(\x0c\"\x9c\x01\n\nPacketType\x12\x1b\n\x17PACKET_TYPE_UNSPECIFIED\x10\x00\x12\x1b\n\x17PACKET_TYPE_HCI_COMMAND\x10\x01\x12\x13\n\x0fPACKET_TYPE_ACL\x10\x02\x12\x13\n\x0fPACKET_TYPE_SCO\x10\x03\x12\x15\n\x11PACKET_TYPE_EVENT\x10\x04\x12\x13\n\x0fPACKET_TYPE_ISO\x10\x05\x42J\n\x1f\x63om.android.emulation.bluetoothP\x01\xf8\x01\x01\xa2\x02\x03\x41\x45\x42\xaa\x02\x1b\x41ndroid.Emulation.Bluetoothb\x06proto3')
-
-
-
-_HCIPACKET = DESCRIPTOR.message_types_by_name['HCIPacket']
-_HCIPACKET_PACKETTYPE = _HCIPACKET.enum_types_by_name['PacketType']
-HCIPacket = _reflection.GeneratedProtocolMessageType('HCIPacket', (_message.Message,), {
-  'DESCRIPTOR' : _HCIPACKET,
-  '__module__' : 'emulated_bluetooth_packets_pb2'
-  # @@protoc_insertion_point(class_scope:android.emulation.bluetooth.HCIPacket)
-  })
-_sym_db.RegisterMessage(HCIPacket)
-
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(
+    DESCRIPTOR, 'emulated_bluetooth_packets_pb2', globals()
+)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None

bumble/transport/emulated_bluetooth_packets_pb2.pyi

@@ -0,0 +1,41 @@
+# Copyright 2021-2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from google.protobuf.internal import enum_type_wrapper as _enum_type_wrapper
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from typing import ClassVar as _ClassVar, Optional as _Optional, Union as _Union
+
+DESCRIPTOR: _descriptor.FileDescriptor
+
+class HCIPacket(_message.Message):
+    __slots__ = ["packet", "type"]
+
+    class PacketType(int, metaclass=_enum_type_wrapper.EnumTypeWrapper):
+        __slots__ = []
+    PACKET_FIELD_NUMBER: _ClassVar[int]
+    PACKET_TYPE_ACL: HCIPacket.PacketType
+    PACKET_TYPE_EVENT: HCIPacket.PacketType
+    PACKET_TYPE_HCI_COMMAND: HCIPacket.PacketType
+    PACKET_TYPE_ISO: HCIPacket.PacketType
+    PACKET_TYPE_SCO: HCIPacket.PacketType
+    PACKET_TYPE_UNSPECIFIED: HCIPacket.PacketType
+    TYPE_FIELD_NUMBER: _ClassVar[int]
+    packet: bytes
+    type: HCIPacket.PacketType
+    def __init__(
+        self,
+        type: _Optional[_Union[HCIPacket.PacketType, str]] = ...,
+        packet: _Optional[bytes] = ...,
+    ) -> None: ...

bumble/transport/emulated_bluetooth_packets_pb2_grpc.py

@@ -0,0 +1,17 @@
+# Copyright 2021-2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc

bumble/transport/emulated_bluetooth_pb2.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,11 +16,11 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: emulated_bluetooth.proto
 """Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
@@ -29,19 +29,12 @@ _sym_db = _symbol_database.Default()
 from . import emulated_bluetooth_packets_pb2 as emulated__bluetooth__packets__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x18\x65mulated_bluetooth.proto\x12\x1b\x61ndroid.emulation.bluetooth\x1a emulated_bluetooth_packets.proto\"\x19\n\x07RawData\x12\x0e\n\x06packet\x18\x01 \x01(\x0c\x32\xcb\x02\n\x18\x45mulatedBluetoothService\x12\x64\n\x12registerClassicPhy\x12$.android.emulation.bluetooth.RawData\x1a$.android.emulation.bluetooth.RawData(\x01\x30\x01\x12`\n\x0eregisterBlePhy\x12$.android.emulation.bluetooth.RawData\x1a$.android.emulation.bluetooth.RawData(\x01\x30\x01\x12g\n\x11registerHCIDevice\x12&.android.emulation.bluetooth.HCIPacket\x1a&.android.emulation.bluetooth.HCIPacket(\x01\x30\x01\x42\"\n\x1e\x63om.android.emulator.bluetoothP\x01\x62\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(
+    b'\n\x18\x65mulated_bluetooth.proto\x12\x1b\x61ndroid.emulation.bluetooth\x1a emulated_bluetooth_packets.proto\"\x19\n\x07RawData\x12\x0e\n\x06packet\x18\x01 \x01(\x0c\x32\xcb\x02\n\x18\x45mulatedBluetoothService\x12\x64\n\x12registerClassicPhy\x12$.android.emulation.bluetooth.RawData\x1a$.android.emulation.bluetooth.RawData(\x01\x30\x01\x12`\n\x0eregisterBlePhy\x12$.android.emulation.bluetooth.RawData\x1a$.android.emulation.bluetooth.RawData(\x01\x30\x01\x12g\n\x11registerHCIDevice\x12&.android.emulation.bluetooth.HCIPacket\x1a&.android.emulation.bluetooth.HCIPacket(\x01\x30\x01\x42\"\n\x1e\x63om.android.emulator.bluetoothP\x01\x62\x06proto3'
+)
 
-
-
-_RAWDATA = DESCRIPTOR.message_types_by_name['RawData']
-RawData = _reflection.GeneratedProtocolMessageType('RawData', (_message.Message,), {
-  'DESCRIPTOR' : _RAWDATA,
-  '__module__' : 'emulated_bluetooth_pb2'
-  # @@protoc_insertion_point(class_scope:android.emulation.bluetooth.RawData)
-  })
-_sym_db.RegisterMessage(RawData)
-
-_EMULATEDBLUETOOTHSERVICE = DESCRIPTOR.services_by_name['EmulatedBluetoothService']
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'emulated_bluetooth_pb2', globals())
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None

bumble/transport/emulated_bluetooth_pb2.pyi

@@ -0,0 +1,26 @@
+# Copyright 2021-2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import emulated_bluetooth_packets_pb2 as _emulated_bluetooth_packets_pb2
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import message as _message
+from typing import ClassVar as _ClassVar, Optional as _Optional
+
+DESCRIPTOR: _descriptor.FileDescriptor
+
+class RawData(_message.Message):
+    __slots__ = ["packet"]
+    PACKET_FIELD_NUMBER: _ClassVar[int]
+    packet: bytes
+    def __init__(self, packet: _Optional[bytes] = ...) -> None: ...

bumble/transport/emulated_bluetooth_pb2_grpc.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -138,7 +138,8 @@ def add_EmulatedBluetoothServiceServicer_to_server(servicer, server):
         ),
     }
     generic_handler = grpc.method_handlers_generic_handler(
-            'android.emulation.bluetooth.EmulatedBluetoothService', rpc_method_handlers)
+        'android.emulation.bluetooth.EmulatedBluetoothService', rpc_method_handlers
+    )
     server.add_generic_rpc_handlers((generic_handler,))
 
 
@@ -156,7 +157,8 @@ class EmulatedBluetoothService(object):
     """
 
     @staticmethod
-    def registerClassicPhy(request_iterator,
+    def registerClassicPhy(
+        request_iterator,
         target,
         options=(),
         channel_credentials=None,
@@ -165,15 +167,27 @@ class EmulatedBluetoothService(object):
         compression=None,
         wait_for_ready=None,
         timeout=None,
-            metadata=None):
-        return grpc.experimental.stream_stream(request_iterator, target, '/android.emulation.bluetooth.EmulatedBluetoothService/registerClassicPhy',
+        metadata=None,
+    ):
+        return grpc.experimental.stream_stream(
+            request_iterator,
+            target,
+            '/android.emulation.bluetooth.EmulatedBluetoothService/registerClassicPhy',
             emulated__bluetooth__pb2.RawData.SerializeToString,
             emulated__bluetooth__pb2.RawData.FromString,
-            options, channel_credentials,
-            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+        )
 
     @staticmethod
-    def registerBlePhy(request_iterator,
+    def registerBlePhy(
+        request_iterator,
         target,
         options=(),
         channel_credentials=None,
@@ -182,15 +196,27 @@ class EmulatedBluetoothService(object):
         compression=None,
         wait_for_ready=None,
         timeout=None,
-            metadata=None):
-        return grpc.experimental.stream_stream(request_iterator, target, '/android.emulation.bluetooth.EmulatedBluetoothService/registerBlePhy',
+        metadata=None,
+    ):
+        return grpc.experimental.stream_stream(
+            request_iterator,
+            target,
+            '/android.emulation.bluetooth.EmulatedBluetoothService/registerBlePhy',
             emulated__bluetooth__pb2.RawData.SerializeToString,
             emulated__bluetooth__pb2.RawData.FromString,
-            options, channel_credentials,
-            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+        )
 
     @staticmethod
-    def registerHCIDevice(request_iterator,
+    def registerHCIDevice(
+        request_iterator,
         target,
         options=(),
         channel_credentials=None,
@@ -199,9 +225,20 @@ class EmulatedBluetoothService(object):
         compression=None,
         wait_for_ready=None,
         timeout=None,
-            metadata=None):
-        return grpc.experimental.stream_stream(request_iterator, target, '/android.emulation.bluetooth.EmulatedBluetoothService/registerHCIDevice',
+        metadata=None,
+    ):
+        return grpc.experimental.stream_stream(
+            request_iterator,
+            target,
+            '/android.emulation.bluetooth.EmulatedBluetoothService/registerHCIDevice',
             emulated__bluetooth__packets__pb2.HCIPacket.SerializeToString,
             emulated__bluetooth__packets__pb2.HCIPacket.FromString,
-            options, channel_credentials,
-            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+        )

bumble/transport/emulated_bluetooth_vhci_pb2.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,24 +16,27 @@
 # Generated by the protocol buffer compiler.  DO NOT EDIT!
 # source: emulated_bluetooth_vhci.proto
 """Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
 from google.protobuf import descriptor as _descriptor
 from google.protobuf import descriptor_pool as _descriptor_pool
-from google.protobuf import message as _message
-from google.protobuf import reflection as _reflection
 from google.protobuf import symbol_database as _symbol_database
+
 # @@protoc_insertion_point(imports)
 
 _sym_db = _symbol_database.Default()
 
 
-import emulated_bluetooth_packets_pb2 as emulated__bluetooth__packets__pb2
+from . import emulated_bluetooth_packets_pb2 as emulated__bluetooth__packets__pb2
 
 
-DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x1d\x65mulated_bluetooth_vhci.proto\x12\x1b\x61ndroid.emulation.bluetooth\x1a emulated_bluetooth_packets.proto2y\n\x15VhciForwardingService\x12`\n\nattachVhci\x12&.android.emulation.bluetooth.HCIPacket\x1a&.android.emulation.bluetooth.HCIPacket(\x01\x30\x01\x42J\n\x1f\x63om.android.emulation.bluetoothP\x01\xf8\x01\x01\xa2\x02\x03\x41\x45\x42\xaa\x02\x1b\x41ndroid.Emulation.Bluetoothb\x06proto3')
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(
+    b'\n\x1d\x65mulated_bluetooth_vhci.proto\x12\x1b\x61ndroid.emulation.bluetooth\x1a emulated_bluetooth_packets.proto2y\n\x15VhciForwardingService\x12`\n\nattachVhci\x12&.android.emulation.bluetooth.HCIPacket\x1a&.android.emulation.bluetooth.HCIPacket(\x01\x30\x01\x42J\n\x1f\x63om.android.emulation.bluetoothP\x01\xf8\x01\x01\xa2\x02\x03\x41\x45\x42\xaa\x02\x1b\x41ndroid.Emulation.Bluetoothb\x06proto3'
+)
 
-
-
-_VHCIFORWARDINGSERVICE = DESCRIPTOR.services_by_name['VhciForwardingService']
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(
+    DESCRIPTOR, 'emulated_bluetooth_vhci_pb2', globals()
+)
 if _descriptor._USE_C_DESCRIPTORS == False:
 
     DESCRIPTOR._options = None

bumble/transport/emulated_bluetooth_vhci_pb2.pyi

@@ -0,0 +1,19 @@
+# Copyright 2021-2023 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+import emulated_bluetooth_packets_pb2 as _emulated_bluetooth_packets_pb2
+from google.protobuf import descriptor as _descriptor
+from typing import ClassVar as _ClassVar
+
+DESCRIPTOR: _descriptor.FileDescriptor

bumble/transport/emulated_bluetooth_vhci_pb2_grpc.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2023 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -82,7 +82,8 @@ def add_VhciForwardingServiceServicer_to_server(servicer, server):
         ),
     }
     generic_handler = grpc.method_handlers_generic_handler(
-            'android.emulation.bluetooth.VhciForwardingService', rpc_method_handlers)
+        'android.emulation.bluetooth.VhciForwardingService', rpc_method_handlers
+    )
     server.add_generic_rpc_handlers((generic_handler,))
 
 
@@ -97,7 +98,8 @@ class VhciForwardingService(object):
     """
 
     @staticmethod
-    def attachVhci(request_iterator,
+    def attachVhci(
+        request_iterator,
         target,
         options=(),
         channel_credentials=None,
@@ -106,9 +108,20 @@ class VhciForwardingService(object):
         compression=None,
         wait_for_ready=None,
         timeout=None,
-            metadata=None):
-        return grpc.experimental.stream_stream(request_iterator, target, '/android.emulation.bluetooth.VhciForwardingService/attachVhci',
+        metadata=None,
+    ):
+        return grpc.experimental.stream_stream(
+            request_iterator,
+            target,
+            '/android.emulation.bluetooth.VhciForwardingService/attachVhci',
             emulated__bluetooth__packets__pb2.HCIPacket.SerializeToString,
             emulated__bluetooth__packets__pb2.HCIPacket.FromString,
-            options, channel_credentials,
-            insecure, call_credentials, compression, wait_for_ready, timeout, metadata)
+            options,
+            channel_credentials,
+            insecure,
+            call_credentials,
+            compression,
+            wait_for_ready,
+            timeout,
+            metadata,
+        )

bumble/transport/file.py

@@ -30,8 +30,9 @@ logger = logging.getLogger(__name__)
 # -----------------------------------------------------------------------------
 async def open_file_transport(spec):
     '''
-    Open a File transport (typically not for a real file, but for a PTY or other unix virtual files).
-    The parameter string is the path of the file to open
+    Open a File transport (typically not for a real file, but for a PTY or other unix
+    virtual files).
+    The parameter string is the path of the file to open.
     '''
 
     # Open the file
@@ -39,14 +40,12 @@ async def open_file_transport(spec):
 
     # Setup reading
     read_transport, packet_source = await asyncio.get_running_loop().connect_read_pipe(
-        lambda: StreamPacketSource(),
-        file
+        StreamPacketSource, file
     )
 
     # Setup writing
     write_transport, _ = await asyncio.get_running_loop().connect_write_pipe(
-        lambda: asyncio.BaseProtocol(),
-        file
+        asyncio.BaseProtocol, file
     )
     packet_sink = StreamPacketSink(write_transport)
 
@@ -57,4 +56,3 @@ async def open_file_transport(spec):
             file.close()
 
     return FileTransport(packet_source, packet_sink)
-

bumble/transport/hci_socket.py

@@ -40,15 +40,21 @@ async def open_hci_socket_transport(spec):
     or a 0-based integer to indicate the adapter number.
     '''
 
-    HCI_CHANNEL_USER = 1
+    HCI_CHANNEL_USER = 1  # pylint: disable=invalid-name
 
     # Create a raw HCI socket
     try:
-        hci_socket = socket.socket(socket.AF_BLUETOOTH, socket.SOCK_RAW | socket.SOCK_NONBLOCK, socket.BTPROTO_HCI)
-    except AttributeError:
+        hci_socket = socket.socket(
+            socket.AF_BLUETOOTH,
+            socket.SOCK_RAW | socket.SOCK_NONBLOCK,
+            socket.BTPROTO_HCI,
+        )
+    except AttributeError as error:
         # Not supported on this platform
         logger.info("HCI sockets not supported on this platform")
-        raise Exception('Bluetooth HCI sockets not supported on this platform')
+        raise Exception(
+            'Bluetooth HCI sockets not supported on this platform'
+        ) from error
 
     # Compute the adapter index
     if spec is None:
@@ -62,20 +68,37 @@ async def open_hci_socket_transport(spec):
     try:
         ctypes.cdll.LoadLibrary('libc.so.6')
         libc = ctypes.CDLL('libc.so.6', use_errno=True)
-    except OSError:
+    except OSError as error:
         logger.info("HCI sockets not supported on this platform")
-        raise Exception('Bluetooth HCI sockets not supported on this platform')
+        raise Exception(
+            'Bluetooth HCI sockets not supported on this platform'
+        ) from error
     libc.bind.argtypes = (ctypes.c_int, ctypes.POINTER(ctypes.c_char), ctypes.c_int)
     libc.bind.restype = ctypes.c_int
-    bind_address = struct.pack('<HHH', socket.AF_BLUETOOTH, adapter_index, HCI_CHANNEL_USER)
-    if libc.bind(hci_socket.fileno(), ctypes.create_string_buffer(bind_address), len(bind_address)) != 0:
+    bind_address = struct.pack(
+        # pylint: disable=no-member
+        '<HHH',
+        socket.AF_BLUETOOTH,
+        adapter_index,
+        HCI_CHANNEL_USER,
+    )
+    if (
+        libc.bind(
+            hci_socket.fileno(),
+            ctypes.create_string_buffer(bind_address),
+            len(bind_address),
+        )
+        != 0
+    ):
         raise IOError(ctypes.get_errno(), os.strerror(ctypes.get_errno()))
 
     class HciSocketSource(ParserSource):
-        def __init__(self, socket):
+        def __init__(self, hci_socket):
             super().__init__()
-            self.socket  = socket
-            asyncio.get_running_loop().add_reader(socket.fileno(), self.recv_until_would_block)
+            self.socket = hci_socket
+            asyncio.get_running_loop().add_reader(
+                self.socket.fileno(), self.recv_until_would_block
+            )
 
         def recv_until_would_block(self):
             logger.debug('recv until would block +++')
@@ -92,8 +115,8 @@ async def open_hci_socket_transport(spec):
             asyncio.get_running_loop().remove_reader(self.socket.fileno())
 
     class HciSocketSink:
-        def __init__(self, socket):
-            self.socket       = socket
+        def __init__(self, hci_socket):
+            self.socket = hci_socket
             self.packets = collections.deque()
             self.writer_added = False
 
@@ -112,9 +135,14 @@ async def open_hci_socket_transport(spec):
                     break
 
             if self.packets:
-                # There's still something to send, ensure that we are monitoring the socket
+                # There's still something to send, ensure that we are monitoring the
+                # socket
                 if not self.writer_added:
-                    asyncio.get_running_loop().add_writer(socket.fileno(), self.send_until_would_block)
+                    asyncio.get_running_loop().add_writer(
+                        # pylint: disable=no-member
+                        self.socket.fileno(),
+                        self.send_until_would_block,
+                    )
                     self.writer_added = True
             else:
                 # Nothing left to send, stop monitoring the socket
@@ -131,9 +159,9 @@ async def open_hci_socket_transport(spec):
                 asyncio.get_running_loop().remove_writer(self.socket.fileno())
 
     class HciSocketTransport(Transport):
-        def __init__(self, socket, source, sink):
+        def __init__(self, hci_socket, source, sink):
             super().__init__(source, sink)
-            self.socket = socket
+            self.socket = hci_socket
 
         async def close(self):
             logger.debug('closing HCI socket transport')

bumble/transport/pty.py

@@ -47,13 +47,11 @@ async def open_pty_transport(spec):
     tty.setraw(replica)
 
     read_transport, packet_source = await asyncio.get_running_loop().connect_read_pipe(
-        lambda: StreamPacketSource(),
-        io.open(primary, 'rb', closefd=False)
+        StreamPacketSource, io.open(primary, 'rb', closefd=False)
     )
 
     write_transport, _ = await asyncio.get_running_loop().connect_write_pipe(
-        lambda: asyncio.BaseProtocol(),
-        io.open(primary, 'wb', closefd=False)
+        asyncio.BaseProtocol, io.open(primary, 'wb', closefd=False)
     )
     packet_sink = StreamPacketSink(write_transport)
 

bumble/transport/pyusb.py

@@ -17,10 +17,11 @@
 # -----------------------------------------------------------------------------
 import asyncio
 import logging
-import usb.core
-import usb.util
 import threading
 import time
+
+import usb.core
+import usb.util
 from colors import color
 
 from .common import Transport, ParserSource
@@ -48,6 +49,7 @@ async def open_pyusb_transport(spec):
     04b4:f901 --> the BT USB dongle with vendor=04b4 and product=f901
     '''
 
+    # pylint: disable=invalid-name
     USB_RECIPIENT_DEVICE = 0x00
     USB_REQUEST_TYPE_CLASS = 0x01 << 5
     USB_ENDPOINT_EVENTS_IN = 0x81
@@ -80,9 +82,17 @@ async def open_pyusb_transport(spec):
                 if packet_type == hci.HCI_ACL_DATA_PACKET:
                     self.device.write(USB_ENDPOINT_ACL_OUT, packet[1:])
                 elif packet_type == hci.HCI_COMMAND_PACKET:
-                    self.device.ctrl_transfer(USB_RECIPIENT_DEVICE | USB_REQUEST_TYPE_CLASS, 0, 0, 0, packet[1:])
+                    self.device.ctrl_transfer(
+                        USB_RECIPIENT_DEVICE | USB_REQUEST_TYPE_CLASS,
+                        0,
+                        0,
+                        0,
+                        packet[1:],
+                    )
                 else:
-                    logger.warning(color(f'unsupported packet type {packet_type}', 'red'))
+                    logger.warning(
+                        color(f'unsupported packet type {packet_type}', 'red')
+                    )
             except usb.core.USBTimeoutError:
                 logger.warning('USB Write Timeout')
             except usb.core.USBError as error:
@@ -100,7 +110,7 @@ async def open_pyusb_transport(spec):
         def run(self):
             while self.stop_event is None:
                 time.sleep(1)
-            self.loop.call_soon_threadsafe(lambda: self.stop_event.set())
+            self.loop.call_soon_threadsafe(self.stop_event.set)
 
     class UsbPacketSource(asyncio.Protocol, ParserSource):
         def __init__(self, device, sco_enabled):
@@ -108,14 +118,13 @@ async def open_pyusb_transport(spec):
             self.device = device
             self.loop = asyncio.get_running_loop()
             self.queue = asyncio.Queue()
+            self.dequeue_task = None
             self.event_thread = threading.Thread(
-                target=self.run,
-                args=(USB_ENDPOINT_EVENTS_IN, hci.HCI_EVENT_PACKET)
+                target=self.run, args=(USB_ENDPOINT_EVENTS_IN, hci.HCI_EVENT_PACKET)
             )
             self.event_thread.stop_event = None
             self.acl_thread = threading.Thread(
-                target=self.run,
-                args=(USB_ENDPOINT_ACL_IN, hci.HCI_ACL_DATA_PACKET)
+                target=self.run, args=(USB_ENDPOINT_ACL_IN, hci.HCI_ACL_DATA_PACKET)
             )
             self.acl_thread.stop_event = None
 
@@ -124,12 +133,12 @@ async def open_pyusb_transport(spec):
             if sco_enabled:
                 self.sco_thread = threading.Thread(
                     target=self.run,
-                    args=(USB_ENDPOINT_SCO_IN, hci.HCI_SYNCHRONOUS_DATA_PACKET)
+                    args=(USB_ENDPOINT_SCO_IN, hci.HCI_SYNCHRONOUS_DATA_PACKET),
                 )
                 self.sco_thread.stop_event = None
 
-        def data_received(self, packet):
-            self.parser.feed_data(packet)
+        def data_received(self, data):
+            self.parser.feed_data(data)
 
         def enqueue(self, packet):
             self.queue.put_nowait(packet)
@@ -173,16 +182,17 @@ async def open_pyusb_transport(spec):
                 except usb.core.USBTimeoutError:
                     continue
                 except usb.core.USBError:
-                    # Don't log this: because pyusb doesn't really support multiple threads
-                    # reading at the same time, we can get occasional USBError(errno=5)
-                    # Input/Output errors reported, but they seem to be harmless.
+                    # Don't log this: because pyusb doesn't really support multiple
+                    # threads reading at the same time, we can get occasional
+                    # USBError(errno=5) Input/Output errors reported, but they seem to
+                    # be harmless.
                     # Until support for async or multi-thread support is added to pyusb,
                     # we'll just live with this as is...
                     # logger.warning(f'USB read error: {error}')
                     time.sleep(1)  # Sleep one second to avoid busy looping
 
             stop_event = current_thread.stop_event
-            self.loop.call_soon_threadsafe(lambda: stop_event.set())
+            self.loop.call_soon_threadsafe(stop_event.set)
 
     class UsbTransport(Transport):
         def __init__(self, device, source, sink):
@@ -194,18 +204,28 @@ async def open_pyusb_transport(spec):
             await self.sink.stop()
             usb.util.release_interface(self.device, 0)
 
+    usb_find = usb.core.find
+    try:
+        import libusb_package
+    except ImportError:
+        logger.debug('libusb_package is not available')
+    else:
+        usb_find = libusb_package.find
+
     # Find the device according to the spec moniker
     if ':' in spec:
         vendor_id, product_id = spec.split(':')
-        device = usb.core.find(idVendor=int(vendor_id, 16), idProduct=int(product_id, 16))
+        device = usb_find(idVendor=int(vendor_id, 16), idProduct=int(product_id, 16))
     else:
         device_index = int(spec)
-        devices = list(usb.core.find(
+        devices = list(
+            usb_find(
                 find_all=1,
                 bDeviceClass=USB_DEVICE_CLASS_WIRELESS_CONTROLLER,
                 bDeviceSubClass=USB_DEVICE_SUBCLASS_RF_CONTROLLER,
-            bDeviceProtocol = USB_DEVICE_PROTOCOL_BLUETOOTH_PRIMARY_CONTROLLER
-        ))
+                bDeviceProtocol=USB_DEVICE_PROTOCOL_BLUETOOTH_PRIMARY_CONTROLLER,
+            )
+        )
         if len(devices) > device_index:
             device = devices[device_index]
         else:
@@ -232,6 +252,7 @@ async def open_pyusb_transport(spec):
 
     # Select an alternate setting for SCO, if available
     sco_enabled = False
+    # pylint: disable=line-too-long
     # NOTE: this is disabled for now, because SCO with alternate settings is broken,
     # see: https://github.com/libusb/libusb/issues/36
     #

bumble/transport/serial.py

@@ -60,13 +60,12 @@ async def open_serial_transport(spec):
         device = spec
     serial_transport, packet_source = await serial_asyncio.create_serial_connection(
         asyncio.get_running_loop(),
-        lambda: StreamPacketSource(),
+        StreamPacketSource,
         device,
         baudrate=speed,
         rtscts=rtscts,
-        dsrdtr=dsrdtr
+        dsrdtr=dsrdtr,
     )
     packet_sink = StreamPacketSink(serial_transport)
 
     return Transport(packet_source, packet_sink)
-

bumble/transport/tcp_client.py

@@ -37,13 +37,13 @@ async def open_tcp_client_transport(spec):
     '''
 
     class TcpPacketSource(StreamPacketSource):
-        def connection_lost(self, error):
-            logger.debug(f'connection lost: {error}')
-            self.terminated.set_result(error)
+        def connection_lost(self, exc):
+            logger.debug(f'connection lost: {exc}')
+            self.terminated.set_result(exc)
 
     remote_host, remote_port = spec.split(':')
     tcp_transport, packet_source = await asyncio.get_running_loop().create_connection(
-        lambda: TcpPacketSource(),
+        TcpPacketSource,
         host=remote_host,
         port=int(remote_port),
     )

bumble/transport/tcp_server.py

@@ -49,8 +49,8 @@ async def open_tcp_server_transport(spec):
 
         # Called when a new connection is established
         def connection_made(self, transport):
-            peername = transport.get_extra_info('peername')
-            logger.debug('connection from {}'.format(peername))
+            peer_name = transport.get_extra_info('peer_name')
+            logger.debug(f'connection from {peer_name}')
             self.packet_sink.transport = transport
 
         # Called when the client is disconnected

bumble/transport/udp.py

@@ -53,10 +53,13 @@ async def open_udp_transport(spec):
     local, remote = spec.split(',')
     local_host, local_port = local.split(':')
     remote_host, remote_port = remote.split(':')
-    udp_transport, packet_source = await asyncio.get_running_loop().create_datagram_endpoint(
-        lambda: UdpPacketSource(),
+    (
+        udp_transport,
+        packet_source,
+    ) = await asyncio.get_running_loop().create_datagram_endpoint(
+        UdpPacketSource,
         local_addr=(local_host, int(local_port)),
-        remote_addr=(remote_host, int(remote_port))
+        remote_addr=(remote_host, int(remote_port)),
     )
     packet_sink = UdpPacketSink(udp_transport)
 

bumble/transport/usb.py

@@ -17,9 +17,12 @@
 # -----------------------------------------------------------------------------
 import asyncio
 import logging
-import usb1
 import threading
 import collections
+import ctypes
+import platform
+
+import usb1
 from colors import color
 
 from .common import Transport, ParserSource
@@ -33,6 +36,30 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
+def load_libusb():
+    '''
+    Attempt to load the libusb-1.0 C library from libusb_package in site-packages.
+    If the library exists, we create a DLL object and initialize the usb1 backend.
+    This only needs to be done once, but before a usb1.USBContext is created.
+    If the library does not exists, do nothing and usb1 will search default system paths
+    when usb1.USBContext is created.
+    '''
+    try:
+        import libusb_package
+    except ImportError:
+        logger.debug('libusb_package is not available')
+    else:
+        if libusb_path := libusb_package.get_library_path():
+            logger.debug(f'loading libusb library at {libusb_path}')
+            dll_loader = (
+                ctypes.WinDLL if platform.system() == 'Windows' else ctypes.CDLL
+            )
+            libusb_dll = dll_loader(
+                str(libusb_path), use_errno=True, use_last_error=True
+            )
+            usb1.loadLibrary(libusb_dll)
+
+
 async def open_usb_transport(spec):
     '''
     Open a USB transport.
@@ -44,21 +71,26 @@ async def open_usb_transport(spec):
     With <index> as the 0-based index to select amongst all the devices that appear
     to be supporting Bluetooth HCI (0 being the first one), or
     Where <vendor> and <product> are the vendor ID and product ID in hexadecimal. The
-    /<serial-number> suffix or #<index> suffix max be specified when more than one device with
-    the same vendor and product identifiers are present.
+    /<serial-number> suffix or #<index> suffix max be specified when more than one
+    device with the same vendor and product identifiers are present.
 
-    In addition, if the moniker ends with the symbol "!", the device will be used in "forced" mode:
-    the first USB interface of the device will be used, regardless of the interface class/subclass.
-    This may be useful for some devices that use a custom class/subclass but may nonetheless work as-is.
+    In addition, if the moniker ends with the symbol "!", the device will be used in
+    "forced" mode:
+    the first USB interface of the device will be used, regardless of the interface
+    class/subclass.
+    This may be useful for some devices that use a custom class/subclass but may
+    nonetheless work as-is.
 
     Examples:
     0 --> the first BT USB dongle
     04b4:f901 --> the BT USB dongle with vendor=04b4 and product=f901
     04b4:f901#2 --> the third USB device with vendor=04b4 and product=f901
-    04b4:f901/00E04C239987 --> the BT USB dongle with vendor=04b4 and product=f901 and serial number 00E04C239987
+    04b4:f901/00E04C239987 --> the BT USB dongle with vendor=04b4 and product=f901 and
+    serial number 00E04C239987
     usb:0B05:17CB! --> the BT USB dongle vendor=0B05 and product=17CB, in "forced" mode.
     '''
 
+    # pylint: disable=invalid-name
     USB_RECIPIENT_DEVICE = 0x00
     USB_REQUEST_TYPE_CLASS = 0x01 << 5
     USB_DEVICE_CLASS_DEVICE = 0x00
@@ -72,7 +104,7 @@ async def open_usb_transport(spec):
     USB_BT_HCI_CLASS_TUPLE = (
         USB_DEVICE_CLASS_WIRELESS_CONTROLLER,
         USB_DEVICE_SUBCLASS_RF_CONTROLLER,
-        USB_DEVICE_PROTOCOL_BLUETOOTH_PRIMARY_CONTROLLER
+        USB_DEVICE_PROTOCOL_BLUETOOTH_PRIMARY_CONTROLLER,
     )
 
     READ_SIZE = 1024
@@ -109,12 +141,15 @@ async def open_usb_transport(spec):
             status = transfer.getStatus()
             # logger.debug(f'<<< USB out transfer callback: status={status}')
 
+            # pylint: disable=no-member
             if status == usb1.TRANSFER_COMPLETED:
                 self.loop.call_soon_threadsafe(self.on_packet_sent_)
             elif status == usb1.TRANSFER_CANCELLED:
                 self.loop.call_soon_threadsafe(self.cancel_done.set_result, None)
             else:
-                logger.warning(color(f'!!! out transfer not completed: status={status}', 'red'))
+                logger.warning(
+                    color(f'!!! out transfer not completed: status={status}', 'red')
+                )
 
         def on_packet_sent_(self):
             if self.packets:
@@ -129,32 +164,38 @@ async def open_usb_transport(spec):
             packet_type = packet[0]
             if packet_type == hci.HCI_ACL_DATA_PACKET:
                 self.transfer.setBulk(
-                    self.acl_out,
-                    packet[1:],
-                    callback=self.on_packet_sent
+                    self.acl_out, packet[1:], callback=self.on_packet_sent
                 )
                 logger.debug('submit ACL')
                 self.transfer.submit()
             elif packet_type == hci.HCI_COMMAND_PACKET:
                 self.transfer.setControl(
-                    USB_RECIPIENT_DEVICE | USB_REQUEST_TYPE_CLASS, 0, 0, 0,
+                    USB_RECIPIENT_DEVICE | USB_REQUEST_TYPE_CLASS,
+                    0,
+                    0,
+                    0,
                     packet[1:],
-                    callback=self.on_packet_sent
+                    callback=self.on_packet_sent,
                 )
                 logger.debug('submit COMMAND')
                 self.transfer.submit()
             else:
                 logger.warning(color(f'unsupported packet type {packet_type}', 'red'))
 
-        async def close(self):
+        def close(self):
             self.closed = True
 
+        async def terminate(self):
+            if not self.closed:
+                self.close()
+
             # Empty the packet queue so that we don't send any more data
             self.packets.clear()
 
             # If we have a transfer in flight, cancel it
             if self.transfer.isSubmitted():
-                # Try to cancel the transfer, but that may fail because it may have already completed
+                # Try to cancel the transfer, but that may fail because it may have
+                # already completed
                 try:
                     self.transfer.cancel()
 
@@ -173,12 +214,15 @@ async def open_usb_transport(spec):
             self.events_in = events_in
             self.loop = asyncio.get_running_loop()
             self.queue = asyncio.Queue()
+            self.dequeue_task = None
             self.closed = False
             self.event_loop_done = self.loop.create_future()
             self.cancel_done = {
                 hci.HCI_EVENT_PACKET: self.loop.create_future(),
-                hci.HCI_ACL_DATA_PACKET: self.loop.create_future()
+                hci.HCI_ACL_DATA_PACKET: self.loop.create_future(),
             }
+            self.events_in_transfer = None
+            self.acl_in_transfer = None
 
             # Create a thread to process events
             self.event_thread = threading.Thread(target=self.run)
@@ -190,7 +234,7 @@ async def open_usb_transport(spec):
                 self.events_in,
                 READ_SIZE,
                 callback=self.on_packet_received,
-                user_data=hci.HCI_EVENT_PACKET
+                user_data=hci.HCI_EVENT_PACKET,
             )
             self.events_in_transfer.submit()
 
@@ -199,7 +243,7 @@ async def open_usb_transport(spec):
                 self.acl_in,
                 READ_SIZE,
                 callback=self.on_packet_received,
-                user_data=hci.HCI_ACL_DATA_PACKET
+                user_data=hci.HCI_ACL_DATA_PACKET,
             )
             self.acl_in_transfer.submit()
 
@@ -209,16 +253,28 @@ async def open_usb_transport(spec):
         def on_packet_received(self, transfer):
             packet_type = transfer.getUserData()
             status = transfer.getStatus()
-            # logger.debug(f'<<< USB IN transfer callback: status={status} packet_type={packet_type} length={transfer.getActualLength()}')
+            # logger.debug(
+            #     f'<<< USB IN transfer callback: status={status} '
+            #     f'packet_type={packet_type} '
+            #     f'length={transfer.getActualLength()}'
+            # )
 
+            # pylint: disable=no-member
             if status == usb1.TRANSFER_COMPLETED:
-                packet = bytes([packet_type]) + transfer.getBuffer()[:transfer.getActualLength()]
+                packet = (
+                    bytes([packet_type])
+                    + transfer.getBuffer()[: transfer.getActualLength()]
+                )
                 self.loop.call_soon_threadsafe(self.queue.put_nowait, packet)
             elif status == usb1.TRANSFER_CANCELLED:
-                self.loop.call_soon_threadsafe(self.cancel_done[packet_type].set_result, None)
+                self.loop.call_soon_threadsafe(
+                    self.cancel_done[packet_type].set_result, None
+                )
                 return
             else:
-                logger.warning(color(f'!!! transfer not completed: status={status}', 'red'))
+                logger.warning(
+                    color(f'!!! transfer not completed: status={status}', 'red')
+                )
 
             # Re-submit the transfer so we can receive more data
             transfer.submit()
@@ -233,7 +289,11 @@ async def open_usb_transport(spec):
 
         def run(self):
             logger.debug('starting USB event loop')
-            while self.events_in_transfer.isSubmitted() or self.acl_in_transfer.isSubmitted():
+            while (
+                self.events_in_transfer.isSubmitted()
+                or self.acl_in_transfer.isSubmitted()
+            ):
+                # pylint: disable=no-member
                 try:
                     self.context.handleEvents()
                 except usb1.USBErrorInterrupted:
@@ -242,22 +302,33 @@ async def open_usb_transport(spec):
             logger.debug('USB event loop done')
             self.loop.call_soon_threadsafe(self.event_loop_done.set_result, None)
 
-        async def close(self):
+        def close(self):
             self.closed = True
+
+        async def terminate(self):
+            if not self.closed:
+                self.close()
+
             self.dequeue_task.cancel()
 
             # Cancel the transfers
             for transfer in (self.events_in_transfer, self.acl_in_transfer):
                 if transfer.isSubmitted():
-                    # Try to cancel the transfer, but that may fail because it may have already completed
+                    # Try to cancel the transfer, but that may fail because it may have
+                    # already completed
                     packet_type = transfer.getUserData()
                     try:
                         transfer.cancel()
-                        logger.debug(f'waiting for IN[{packet_type}] transfer cancellation to be done...')
+                        logger.debug(
+                            f'waiting for IN[{packet_type}] transfer cancellation '
+                            'to be done...'
+                        )
                         await self.cancel_done[packet_type]
                         logger.debug(f'IN[{packet_type}] transfer cancellation done')
                     except usb1.USBError:
-                        logger.debug(f'IN[{packet_type}] transfer likely already completed')
+                        logger.debug(
+                            f'IN[{packet_type}] transfer likely already completed'
+                        )
 
             # Wait for the thread to terminate
             await self.event_loop_done
@@ -281,13 +352,16 @@ async def open_usb_transport(spec):
             sink.start()
 
         async def close(self):
-            await self.source.close()
-            await self.sink.close()
+            self.source.close()
+            self.sink.close()
+            await self.source.terminate()
+            await self.sink.terminate()
             self.device.releaseInterface(self.interface)
             self.device.close()
             self.context.close()
 
     # Find the device according to the spec moniker
+    load_libusb()
     context = usb1.USBContext()
     context.open()
     try:
@@ -315,9 +389,9 @@ async def open_usb_transport(spec):
                 except usb1.USBError:
                     device_serial_number = None
                 if (
-                    device.getVendorID() == int(vendor_id, 16) and
-                    device.getProductID() == int(product_id, 16) and
-                    (serial_number is None or serial_number == device_serial_number)
+                    device.getVendorID() == int(vendor_id, 16)
+                    and device.getProductID() == int(product_id, 16)
+                    and (serial_number is None or serial_number == device_serial_number)
                 ):
                     if device_index == 0:
                         found = device
@@ -328,8 +402,11 @@ async def open_usb_transport(spec):
             # Look for a compatible device by index
             def device_is_bluetooth_hci(device):
                 # Check if the device class indicates a match
-                if (device.getDeviceClass(), device.getDeviceSubClass(), device.getDeviceProtocol()) == \
-                        USB_BT_HCI_CLASS_TUPLE:
+                if (
+                    device.getDeviceClass(),
+                    device.getDeviceSubClass(),
+                    device.getDeviceProtocol(),
+                ) == USB_BT_HCI_CLASS_TUPLE:
                     return True
 
                 # If the device class is 'Device', look for a matching interface
@@ -337,8 +414,11 @@ async def open_usb_transport(spec):
                     for configuration in device:
                         for interface in configuration:
                             for setting in interface:
-                                if (setting.getClass(), setting.getSubClass(), setting.getProtocol()) == \
-                                        USB_BT_HCI_CLASS_TUPLE:
+                                if (
+                                    setting.getClass(),
+                                    setting.getSubClass(),
+                                    setting.getProtocol(),
+                                ) == USB_BT_HCI_CLASS_TUPLE:
                                     return True
 
                 return False
@@ -360,14 +440,20 @@ async def open_usb_transport(spec):
 
         # Look for the first interface with the right class and endpoints
         def find_endpoints(device):
+            # pylint: disable-next=too-many-nested-blocks
             for (configuration_index, configuration) in enumerate(device):
                 interface = None
                 for interface in configuration:
                     setting = None
                     for setting in interface:
                         if (
-                            not forced_mode and
-                            (setting.getClass(), setting.getSubClass(), setting.getProtocol()) != USB_BT_HCI_CLASS_TUPLE
+                            not forced_mode
+                            and (
+                                setting.getClass(),
+                                setting.getSubClass(),
+                                setting.getProtocol(),
+                            )
+                            != USB_BT_HCI_CLASS_TUPLE
                         ):
                             continue
 
@@ -382,22 +468,34 @@ async def open_usb_transport(spec):
                                     acl_in = address
                                 elif acl_out is None:
                                     acl_out = address
-                            elif attributes & 0x03 == USB_ENDPOINT_TRANSFER_TYPE_INTERRUPT:
+                            elif (
+                                attributes & 0x03
+                                == USB_ENDPOINT_TRANSFER_TYPE_INTERRUPT
+                            ):
                                 if address & USB_ENDPOINT_IN and events_in is None:
                                     events_in = address
 
                         # Return if we found all 3 endpoints
-                        if acl_in is not None and acl_out is not None and events_in is not None:
+                        if (
+                            acl_in is not None
+                            and acl_out is not None
+                            and events_in is not None
+                        ):
                             return (
                                 configuration_index + 1,
                                 setting.getNumber(),
                                 setting.getAlternateSetting(),
                                 acl_in,
                                 acl_out,
-                                events_in
+                                events_in,
                             )
-                        else:
-                            logger.debug(f'skipping configuration {configuration_index + 1} / interface {setting.getNumber()}')
+
+                        logger.debug(
+                            f'skipping configuration {configuration_index + 1} / '
+                            f'interface {setting.getNumber()}'
+                        )
+
+            return None
 
         endpoints = find_endpoints(found)
         if endpoints is None:
@@ -414,14 +512,14 @@ async def open_usb_transport(spec):
 
         device = found.open()
 
-        # Detach the kernel driver if supported and needed
+        # Auto-detach the kernel driver if supported
+        # pylint: disable=no-member
         if usb1.hasCapability(usb1.CAP_SUPPORTS_DETACH_KERNEL_DRIVER):
             try:
-                if device.kernelDriverActive(interface):
-                    logger.debug("detaching kernel driver")
-                    device.detachKernelDriver(interface)
-            except usb1.USBError:
-                pass
+                logger.debug('auto-detaching kernel driver')
+                device.setAutoDetachKernelDriver(True)
+            except usb1.USBError as error:
+                logger.warning(f'unable to auto-detach kernel driver: {error}')
 
         # Set the configuration if needed
         try:

bumble/transport/vhci.py

@@ -33,7 +33,7 @@ async def open_vhci_transport(spec):
     path at /dev/vhci), or the path of a VHCI device
     '''
 
-    HCI_VENDOR_PKT = 0xff
+    HCI_VENDOR_PKT = 0xFF
     HCI_BREDR = 0x00  # Controller type
 
     # Open the VHCI device
@@ -56,4 +56,3 @@ async def open_vhci_transport(spec):
     transport.sink.on_packet(bytes([HCI_VENDOR_PKT, HCI_BREDR]))
 
     return transport
-

bumble/transport/ws_client.py

@@ -43,7 +43,7 @@ async def open_ws_client_transport(spec):
     transport = PumpedTransport(
         PumpedPacketSource(websocket.recv),
         PumpedPacketSink(websocket.send),
-        websocket.close
+        websocket.close,
     )
     transport.start()
     return transport

bumble/transport/ws_server.py

@@ -44,27 +44,33 @@ async def open_ws_server_transport(spec):
             source = ParserSource()
             sink = PumpedPacketSink(self.send_packet)
             self.connection = asyncio.get_running_loop().create_future()
+            self.server = None
 
             super().__init__(source, sink)
 
         async def serve(self, local_host, local_port):
             self.sink.start()
+            # pylint: disable-next=no-member
             self.server = await websockets.serve(
                 ws_handler=self.on_connection,
                 host=local_host if local_host != '_' else None,
-                port       = int(local_port)
+                port=int(local_port),
             )
             logger.debug(f'websocket server ready on port {local_port}')
 
         async def on_connection(self, connection):
-            logger.debug(f'new connection on {connection.local_address} from {connection.remote_address}')
+            logger.debug(
+                f'new connection on {connection.local_address} '
+                f'from {connection.remote_address}'
+            )
             self.connection.set_result(connection)
+            # pylint: disable=no-member
             try:
                 async for packet in connection:
-                    if type(packet) is bytes:
+                    if isinstance(packet, bytes):
                         self.source.parser.feed_data(packet)
                     else:
-                        logger.warn('discarding packet: not a BINARY frame')
+                        logger.warning('discarding packet: not a BINARY frame')
             except websockets.WebSocketException as error:
                 logger.debug(f'exception while receiving packet: {error}')
 

bumble/utils.py

@@ -19,6 +19,8 @@ import asyncio
 import logging
 import traceback
 import collections
+import sys
+from typing import Awaitable
 from functools import wraps
 from colors import color
 from pyee import EventEmitter
@@ -34,6 +36,7 @@ logger = logging.getLogger(__name__)
 def setup_event_forwarding(emitter, forwarder, event_name):
     def emit(*args, **kwargs):
         forwarder.emit(event_name, *args, **kwargs)
+
     emitter.on(event_name, emit)
 
 
@@ -44,6 +47,8 @@ def composite_listener(cls):
     registers/deregisters all methods named `on_<event_name>` as a listener for
     the <event_name> event with an emitter.
     """
+    # pylint: disable=protected-access
+
     def register(self, emitter):
         for method_name in dir(cls):
             if method_name.startswith('on_'):
@@ -60,7 +65,36 @@ def composite_listener(cls):
 
 
 # -----------------------------------------------------------------------------
-class CompositeEventEmitter(EventEmitter):
+class AbortableEventEmitter(EventEmitter):
+    def abort_on(self, event: str, awaitable: Awaitable):
+        """
+        Set a coroutine or future to abort when an event occur.
+        """
+        future = asyncio.ensure_future(awaitable)
+        if future.done():
+            return future
+
+        def on_event(*_):
+            msg = f'abort: {event} event occurred.'
+            if isinstance(future, asyncio.Task):
+                # python < 3.9 does not support passing a message on `Task.cancel`
+                if sys.version_info < (3, 9, 0):
+                    future.cancel()
+                else:
+                    future.cancel(msg)
+            else:
+                future.set_exception(asyncio.CancelledError(msg))
+
+        def on_done(_):
+            self.remove_listener(event, on_event)
+
+        self.on(event, on_event)
+        future.add_done_callback(on_done)
+        return future
+
+
+# -----------------------------------------------------------------------------
+class CompositeEventEmitter(AbortableEventEmitter):
     def __init__(self):
         super().__init__()
         self._listener = None
@@ -71,6 +105,7 @@ class CompositeEventEmitter(EventEmitter):
 
     @listener.setter
     def listener(self, listener):
+        # pylint: disable=protected-access
         if self._listener:
             # Call the deregistration methods for each base class that has them
             for cls in self._listener.__class__.mro():
@@ -110,7 +145,9 @@ class AsyncRunner:
                 try:
                     await item
                 except Exception as error:
-                    logger.warning(f'{color("!!! Exception in work queue:", "red")} {error}')
+                    logger.warning(
+                        f'{color("!!! Exception in work queue:", "red")} {error}'
+                    )
 
     # Shared default queue
     default_queue = WorkQueue()
@@ -131,7 +168,10 @@ class AsyncRunner:
                         try:
                             await coroutine
                         except Exception:
-                            logger.warning(f'{color("!!! Exception in wrapper:", "red")} {traceback.format_exc()}')
+                            logger.warning(
+                                f'{color("!!! Exception in wrapper:", "red")} '
+                                f'{traceback.format_exc()}'
+                            )
 
                     asyncio.create_task(run())
                 else:
@@ -150,7 +190,15 @@ class FlowControlAsyncPipe:
     paused (by calling a function passed in when the pipe is created) if the
     amount of queued data exceeds a specified threshold.
     """
-    def __init__(self, pause_source, resume_source, write_to_sink=None, drain_sink=None, threshold=0):
+
+    def __init__(
+        self,
+        pause_source,
+        resume_source,
+        write_to_sink=None,
+        drain_sink=None,
+        threshold=0,
+    ):
         self.pause_source = pause_source
         self.resume_source = resume_source
         self.write_to_sink = write_to_sink

docs/mkdocs/mkdocs.yml

@@ -7,6 +7,8 @@ nav:
   - Getting Started: getting_started.md
   - Development:
     - Python Environments: development/python_environments.md
+    - Contributing: development/contributing.md
+    - Code Style: development/code_style.md
   - Use Cases:
     - Overview: use_cases/index.md
     - Use Case 1: use_cases/use_case_1.md

docs/mkdocs/src/api/reference.md

@@ -16,4 +16,3 @@ Bumble Python API
 
 ### HCI_Disconnect_Command
 ::: bumble.hci.HCI_Disconnect_Command
-

docs/mkdocs/src/apps_and_tools/hci_bridge.md

@@ -28,5 +28,3 @@ a host that send custom HCI commands that the controller may not understand.
     (through which the communication with other virtual controllers will be mediated).
 
     NOTE: this assumes you're running a Link Relay on port `10723`.
-
-

docs/mkdocs/src/apps_and_tools/index.md

@@ -11,4 +11,3 @@ These include:
   * [Golden Gate Bridge](gg_bridge.md) - a bridge between GATT and UDP to use with the Golden Gate "stack tool"
   * [Show](show.md) - Parse a file with HCI packets and print the details of each packet in a human readable form
   * [Link Relay](link_relay.md) - WebSocket relay for virtual RemoteLink instances to communicate with each other.
-

docs/mkdocs/src/apps_and_tools/link_relay.md

@@ -31,4 +31,3 @@ The WebSocket path used by a connecting client indicates which virtual "chat roo
     It is possible to connect to a "chat room" in a relay as an observer, rather than a virtual controller. In this case, a text-based console can be used to observe what is going on in the "chat room". Tools like [`wscat`](https://github.com/websockets/wscat#readme) or [`websocat`](https://github.com/vi/websocat) can be used for that.
 
     Example: `wscat --connect ws://localhost:10723/test`
-

docs/mkdocs/src/development/code_style.md

@@ -0,0 +1,43 @@
+CODE STYLE
+==========
+
+The Python code style used in this project follows the [Black code style](https://black.readthedocs.io/en/stable/the_black_code_style/current_style.html). 
+
+# Formatting
+
+For now, we are configuring the `black` formatter with the option to leave quotes unchanged.
+The preferred quote style is single quotes, which isn't a configurable option for `Black`, so we are not enforcing it. This may change in the future. 
+
+## Ignoring Commit for Git Blame
+
+The adoption of `Black` as a formatter came in late in the project, with already a large code base. As a result, a large number of files were changed in a single commit, which gets in the way of tracing authorship with `git blame`. The file `git-blame-ignore-revs` contains the commit hash of when that mass-formatting event occurred, which you can use to skip it in a `git blame` analysis:
+
+!!! example "Ignoring a commit with `git blame`"
+    ```
+    $ git blame --ignore-revs-file .git-blame-ignore-revs
+    ```
+
+# Linting
+
+The project includes a `pylint` configuration (see the `pyproject.toml` file for details). 
+The `pre-commit` checks only enforce that there are no errors. But we strongly recommend that you run the linter with warnings enabled at least, and possibly the "Refactor" ('R') and "Convention" ('C') categories as well. 
+To run the linter, use the `project.lint` invoke command. 
+
+!!! example "Running the linter with default options"
+    With the default settings, Errors and Warnings are enabled, but Refactor and Convention categories are not.
+    ```
+    $ invoke project.lint
+    ```
+
+!!! example "Running the linter with all categories"
+    ```
+    $ invoke project.lint --disable=""
+    ```
+
+# Editor/IDE Integration
+
+## Visual Studio Code
+
+The project includes a `.vscode/settings.json` file that specifies the `black` formatter and enables an editor ruler at 88 columns. 
+You may want to configure your own environment to "format on save" with `black` if you find that useful. We are not making that choice at the workspace level.
+

docs/mkdocs/src/development/contributing.md

@@ -0,0 +1,11 @@
+CONTRIBUTING TO THE PROJECT
+===========================
+
+To contribute some code to the project, you will need to submit a GitHub Pull Request (a.k.a PR). Please familiarize yourself with how that works (see [GitHub Pull Requests](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/proposing-changes-to-your-work-with-pull-requests/about-pull-requests))
+
+You should follow the project's [code style](code_style.md), and pre-check your code before submitting a PR. The GitHub project is set up with some [Actions](https://github.com/features/actions) that will check that a PR passes at least the basic tests and complies with the coding style, but it is still recommended to check that for yourself before submitting a PR. 
+To run the basic checks (essentially: running the tests, the linter, and the formatter), use the `project.pre-commit` `invoke` command, and address any issues found:
+
+```
+$ invoke project.pre-commit
+```

docs/mkdocs/src/getting_started.md

@@ -67,6 +67,8 @@ $ python -m pip install git+https://github.com/google/bumble.git@27c0551
 When you work on the Bumble code itself, and run some of the tests or example apps, or import the
 module in your own code, you typically either install the package from source in "development mode" as described above, or you may choose to skip the install phase.
 
+If you plan on contributing to the project, please read the [contributing](development/contributing.md) section.
+
 ## Without Installing
 If you prefer not to install the package (even in development mode), you can load the module directly from its location in the project.
 A simple way to do that is to set your `PYTHONPATH` to

docs/mkdocs/src/index.md

@@ -163,4 +163,3 @@ Future features to be considered include:
   * Bindings for languages other than Python
   * RPC interface to expose most of the API for remote use
   * (...suggest anything you want...)
-

docs/mkdocs/src/platforms/android.md

@@ -86,4 +86,3 @@ Use the `--format snoop` option to specify that the file is in that specific for
     ```shell
     $ bumble-show --format snoop btsnoop_hci.log
     ```
-

docs/mkdocs/src/platforms/linux.md

@@ -204,5 +204,3 @@ With the [VHCI transport](../transports/vhci.md) you can attach a Bumble virtual
 ### Using a Simulated UART HCI
 
 ### Bridge to a Remote Controller
-
-

docs/mkdocs/src/platforms/macos.md

@@ -11,4 +11,3 @@ To do that, use the following command:
 sudo nvram bluetoothHostControllerSwitchBehavior="never"
 ```
 A reboot shouldn't be necessary after that. See [Tech Note 2295](https://developer.apple.com/library/archive/technotes/tn2295/_index.html)
-

docs/mkdocs/src/transports/usb.md

@@ -42,6 +42,11 @@ This may be useful for some devices that use a custom class/subclass but may non
 The library includes two different implementations of the USB transport, implemented using different python bindings for `libusb`.
 Using the transport prefix `pyusb:` instead of `usb:` selects the implementation based on  [PyUSB](https://pypi.org/project/pyusb/), using the synchronous API of `libusb`, whereas the default implementation is based on [libusb1](https://pypi.org/project/libusb1/), using the asynchronous API of `libusb`. In order to use the alternative PyUSB-based implementation, you need to ensure that you have installed that python module, as it isn't installed by default as a dependency of Bumble.
 
+## Libusb
+
+The `libusb-1.0` shared library is required to use both `usb` and `pyusb` transports. This library should be installed automatically with Bumble, as part of the `libusb_package` Python package.
+If your OS or architecture is not supported by `libusb_package`, you can install a system-wide library with `brew install libusb` for Mac or `apt install libusb-1.0-0` for Linux.
+
 ## Listing Available USB Devices
 
 ### With `usb_probe`

examples/async_runner.py

@@ -80,6 +80,7 @@ async def main():
     await my_work_queue2.run()
     print("MAIN: end (should never get here)")
 
+
 # -----------------------------------------------------------------------------
 logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
 asyncio.run(main())

examples/battery_client.py

@@ -20,7 +20,7 @@ import sys
 import os
 import logging
 from colors import color
-from bumble.device import Device, Peer
+from bumble.device import Device
 from bumble.transport import open_transport
 from bumble.profiles.battery_service import BatteryServiceProxy
 
@@ -55,7 +55,9 @@ async def main():
             # Subscribe to and read the battery level
             if battery_service.battery_level:
                 await battery_service.battery_level.subscribe(
-                    lambda value: print(f'{color("Battery Level Update:", "green")} {value}')
+                    lambda value: print(
+                        f'{color("Battery Level Update:", "green")} {value}'
+                    )
                 )
                 value = await battery_service.battery_level.read_value()
                 print(f'{color("Initial Battery Level:", "green")} {value}')

examples/battery_server.py

@@ -44,11 +44,19 @@ async def main():
 
         # Set the advertising data
         device.advertising_data = bytes(
-            AdvertisingData([
-                (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Battery', 'utf-8')),
-                (AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, bytes(battery_service.uuid)),
-                (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340))
-            ])
+            AdvertisingData(
+                [
+                    (
+                        AdvertisingData.COMPLETE_LOCAL_NAME,
+                        bytes('Bumble Battery', 'utf-8'),
+                    ),
+                    (
+                        AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+                        bytes(battery_service.uuid),
+                    ),
+                    (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340)),
+                ]
+            )
         )
 
         # Go!
@@ -58,7 +66,9 @@ async def main():
         # Notify every 3 seconds
         while True:
             await asyncio.sleep(3.0)
-            await device.notify_subscribers(battery_service.battery_level_characteristic)
+            await device.notify_subscribers(
+                battery_service.battery_level_characteristic
+            )
 
 
 # -----------------------------------------------------------------------------

examples/device_information_client.py

@@ -28,7 +28,9 @@ from bumble.transport import open_transport
 # -----------------------------------------------------------------------------
 async def main():
     if len(sys.argv) != 3:
-        print('Usage: device_information_client.py <transport-spec> <bluetooth-address>')
+        print(
+            'Usage: device_information_client.py <transport-spec> <bluetooth-address>'
+        )
         print('example: device_information_client.py usb:0 E1:CA:72:48:C4:E8')
         return
 
@@ -49,7 +51,9 @@ async def main():
         # Discover the Device Information service
         peer = Peer(connection)
         print('=== Discovering Device Information Service')
-        device_information_service = await peer.discover_service_and_create_proxy(DeviceInformationServiceProxy)
+        device_information_service = await peer.discover_service_and_create_proxy(
+            DeviceInformationServiceProxy
+        )
 
         # Check that the service was found
         if device_information_service is None:
@@ -58,21 +62,51 @@ async def main():
 
         # Read and print the fields
         if device_information_service.manufacturer_name is not None:
-            print(color('Manufacturer Name:       ', 'green'), await device_information_service.manufacturer_name.read_value())
+            print(
+                color('Manufacturer Name:       ', 'green'),
+                await device_information_service.manufacturer_name.read_value(),
+            )
         if device_information_service.model_number is not None:
-            print(color('Model Number:            ', 'green'), await device_information_service.model_number.read_value())
+            print(
+                color('Model Number:            ', 'green'),
+                await device_information_service.model_number.read_value(),
+            )
         if device_information_service.serial_number is not None:
-            print(color('Serial Number:           ', 'green'), await device_information_service.serial_number.read_value())
+            print(
+                color('Serial Number:           ', 'green'),
+                await device_information_service.serial_number.read_value(),
+            )
         if device_information_service.hardware_revision is not None:
-            print(color('Hardware Revision:       ', 'green'), await device_information_service.hardware_revision.read_value())
+            print(
+                color('Hardware Revision:       ', 'green'),
+                await device_information_service.hardware_revision.read_value(),
+            )
         if device_information_service.firmware_revision is not None:
-            print(color('Firmware Revision:       ', 'green'), await device_information_service.firmware_revision.read_value())
+            print(
+                color('Firmware Revision:       ', 'green'),
+                await device_information_service.firmware_revision.read_value(),
+            )
         if device_information_service.software_revision is not None:
-            print(color('Software Revision:       ', 'green'), await device_information_service.software_revision.read_value())
+            print(
+                color('Software Revision:       ', 'green'),
+                await device_information_service.software_revision.read_value(),
+            )
         if device_information_service.system_id is not None:
-            print(color('System ID:               ', 'green'), await device_information_service.system_id.read_value())
-        if device_information_service.ieee_regulatory_certification_data_list is not None:
-            print(color('Regulatory Certification:', 'green'), (await device_information_service.ieee_regulatory_certification_data_list.read_value()).hex())
+            print(
+                color('System ID:               ', 'green'),
+                await device_information_service.system_id.read_value(),
+            )
+        if (
+            device_information_service.ieee_regulatory_certification_data_list
+            is not None
+        ):
+            print(
+                color('Regulatory Certification:', 'green'),
+                (
+                    # pylint: disable-next=line-too-long
+                    await device_information_service.ieee_regulatory_certification_data_list.read_value()
+                ).hex(),
+            )
 
 
 # -----------------------------------------------------------------------------

examples/device_information_server.py

@@ -44,16 +44,21 @@ async def main():
             serial_number='7654321',
             hardware_revision='1.1.3',
             software_revision='2.5.6',
-            system_id         = (0x123456, 0x8877665544)
+            system_id=(0x123456, 0x8877665544),
         )
         device.add_service(device_information_service)
 
         # Set the advertising data
         device.advertising_data = bytes(
-            AdvertisingData([
-                (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Device', 'utf-8')),
-                (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340))
-            ])
+            AdvertisingData(
+                [
+                    (
+                        AdvertisingData.COMPLETE_LOCAL_NAME,
+                        bytes('Bumble Device', 'utf-8'),
+                    ),
+                    (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340)),
+                ]
+            )
         )
 
         # Go!
@@ -61,6 +66,7 @@ async def main():
         await device.start_advertising(auto_restart=True)
         await hci_source.wait_for_termination()
 
+
 # -----------------------------------------------------------------------------
 logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
 asyncio.run(main())

examples/heart_rate_client.py

@@ -20,7 +20,7 @@ import sys
 import os
 import logging
 from colors import color
-from bumble.device import Device, Peer
+from bumble.device import Device
 from bumble.transport import open_transport
 from bumble.profiles.heart_rate_service import HeartRateServiceProxy
 
@@ -61,7 +61,9 @@ async def main():
             # Subscribe to the heart rate measurement
             if heart_rate_service.heart_rate_measurement:
                 await heart_rate_service.heart_rate_measurement.subscribe(
-                    lambda value: print(f'{color("Heart Rate Measurement:", "green")} {value}')
+                    lambda value: print(
+                        f'{color("Heart Rate Measurement:", "green")} {value}'
+                    )
                 )
 
             await peer.sustain()

examples/heart_rate_server.py

@@ -55,29 +55,47 @@ async def main():
             serial_number='7654321',
             hardware_revision='1.1.3',
             software_revision='2.5.6',
-            system_id         = (0x123456, 0x8877665544)
+            system_id=(0x123456, 0x8877665544),
         )
 
         heart_rate_service = HeartRateService(
             read_heart_rate_measurement=lambda _: HeartRateService.HeartRateMeasurement(
                 heart_rate=100 + int(50 * math.sin(time.time() * math.pi / 60)),
                 sensor_contact_detected=random.choice((True, False, None)),
-                energy_expended         = random.choice((int((time.time() - energy_start_time) * 100), None)),
-                rr_intervals            = random.choice(((random.randint(900, 1100) / 1000, random.randint(900, 1100) / 1000), None))
+                energy_expended=random.choice(
+                    (int((time.time() - energy_start_time) * 100), None)
+                ),
+                rr_intervals=random.choice(
+                    (
+                        (
+                            random.randint(900, 1100) / 1000,
+                            random.randint(900, 1100) / 1000,
+                        ),
+                        None,
+                    )
+                ),
             ),
             body_sensor_location=HeartRateService.BodySensorLocation.WRIST,
-            reset_energy_expended=lambda _: reset_energy_expended()
+            reset_energy_expended=lambda _: reset_energy_expended(),
         )
 
         device.add_services([device_information_service, heart_rate_service])
 
         # Set the advertising data
         device.advertising_data = bytes(
-            AdvertisingData([
-                (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Heart', 'utf-8')),
-                (AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS, bytes(heart_rate_service.uuid)),
-                (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340))
-            ])
+            AdvertisingData(
+                [
+                    (
+                        AdvertisingData.COMPLETE_LOCAL_NAME,
+                        bytes('Bumble Heart', 'utf-8'),
+                    ),
+                    (
+                        AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+                        bytes(heart_rate_service.uuid),
+                    ),
+                    (AdvertisingData.APPEARANCE, struct.pack('<H', 0x0340)),
+                ]
+            )
         )
 
         # Go!
@@ -87,7 +105,9 @@ async def main():
         # Notify every 3 seconds
         while True:
             await asyncio.sleep(3.0)
-            await device.notify_subscribers(heart_rate_service.heart_rate_measurement_characteristic)
+            await device.notify_subscribers(
+                heart_rate_service.heart_rate_measurement_characteristic
+            )
 
 
 # -----------------------------------------------------------------------------

examples/keyboard.py

@@ -20,8 +20,8 @@ import sys
 import os
 import logging
 import struct
-import websockets
 import json
+import websockets
 from colors import color
 
 from bumble.core import AdvertisingData
@@ -43,7 +43,7 @@ from bumble.gatt import (
     GATT_PROTOCOL_MODE_CHARACTERISTIC,
     GATT_HID_INFORMATION_CHARACTERISTIC,
     GATT_HID_CONTROL_POINT_CHARACTERISTIC,
-    GATT_REPORT_REFERENCE_DESCRIPTOR
+    GATT_REPORT_REFERENCE_DESCRIPTOR,
 )
 
 # -----------------------------------------------------------------------------
@@ -58,44 +58,80 @@ HID_OUTPUT_REPORT  = 0x02
 HID_FEATURE_REPORT = 0x03
 
 # Report Map
-HID_KEYBOARD_REPORT_MAP = bytes([
-    0x05, 0x01,  # Usage Page (Generic Desktop Ctrls)
-    0x09, 0x06,  # Usage (Keyboard)
-    0xA1, 0x01,  # Collection (Application)
-    0x85, 0x01,  # . Report ID (1)
-    0x05, 0x07,  # . Usage Page (Kbrd/Keypad)
-    0x19, 0xE0,  # . Usage Minimum (0xE0)
-    0x29, 0xE7,  # . Usage Maximum (0xE7)
-    0x15, 0x00,  # . Logical Minimum (0)
-    0x25, 0x01,  # . Logical Maximum (1)
-    0x75, 0x01,  # . Report Size (1)
-    0x95, 0x08,  # . Report Count (8)
-    0x81, 0x02,  # . Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
-    0x95, 0x01,  # . Report Count (1)
-    0x75, 0x08,  # . Report Size (8)
-    0x81, 0x01,  # . Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
-    0x95, 0x06,  # . Report Count (6)
-    0x75, 0x08,  # . Report Size (8)
-    0x15, 0x00,  # . Logical Minimum (0x00)
-    0x25, 0x94,  # . Logical Maximum (0x94)
-    0x05, 0x07,  # . Usage Page (Kbrd/Keypad)
-    0x19, 0x00,  # . Usage Minimum (0x00)
-    0x29, 0x94,  # . Usage Maximum (0x94)
-    0x81, 0x00,  # . Input (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
-    0x95, 0x05,  # . Report Count (5)
-    0x75, 0x01,  # . Report Size (1)
-    0x05, 0x08,  # . Usage Page (LEDs)
-    0x19, 0x01,  # . Usage Minimum (Num Lock)
-    0x29, 0x05,  # . Usage Maximum (Kana)
-    0x91, 0x02,  # . Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
-    0x95, 0x01,  # . Report Count (1)
-    0x75, 0x03,  # . Report Size (3)
-    0x91, 0x01,  # . Output (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
-    0xC0         # End Collection
-])
+HID_KEYBOARD_REPORT_MAP = bytes(
+    # pylint: disable=line-too-long
+    [
+        0x05,
+        0x01,  # Usage Page (Generic Desktop Controls)
+        0x09,
+        0x06,  # Usage (Keyboard)
+        0xA1,
+        0x01,  # Collection (Application)
+        0x85,
+        0x01,  # . Report ID (1)
+        0x05,
+        0x07,  # . Usage Page (Keyboard/Keypad)
+        0x19,
+        0xE0,  # . Usage Minimum (0xE0)
+        0x29,
+        0xE7,  # . Usage Maximum (0xE7)
+        0x15,
+        0x00,  # . Logical Minimum (0)
+        0x25,
+        0x01,  # . Logical Maximum (1)
+        0x75,
+        0x01,  # . Report Size (1)
+        0x95,
+        0x08,  # . Report Count (8)
+        0x81,
+        0x02,  # . Input (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position)
+        0x95,
+        0x01,  # . Report Count (1)
+        0x75,
+        0x08,  # . Report Size (8)
+        0x81,
+        0x01,  # . Input (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
+        0x95,
+        0x06,  # . Report Count (6)
+        0x75,
+        0x08,  # . Report Size (8)
+        0x15,
+        0x00,  # . Logical Minimum (0x00)
+        0x25,
+        0x94,  # . Logical Maximum (0x94)
+        0x05,
+        0x07,  # . Usage Page (Keyboard/Keypad)
+        0x19,
+        0x00,  # . Usage Minimum (0x00)
+        0x29,
+        0x94,  # . Usage Maximum (0x94)
+        0x81,
+        0x00,  # . Input (Data,Array,Abs,No Wrap,Linear,Preferred State,No Null Position)
+        0x95,
+        0x05,  # . Report Count (5)
+        0x75,
+        0x01,  # . Report Size (1)
+        0x05,
+        0x08,  # . Usage Page (LEDs)
+        0x19,
+        0x01,  # . Usage Minimum (Num Lock)
+        0x29,
+        0x05,  # . Usage Maximum (Kana)
+        0x91,
+        0x02,  # . Output (Data,Var,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
+        0x95,
+        0x01,  # . Report Count (1)
+        0x75,
+        0x03,  # . Report Size (3)
+        0x91,
+        0x01,  # . Output (Const,Array,Abs,No Wrap,Linear,Preferred State,No Null Position,Non-volatile)
+        0xC0,  # End Collection
+    ]
+)
 
 
 # -----------------------------------------------------------------------------
+# pylint: disable=invalid-overridden-method
 class ServerListener(Device.Listener, Connection.Listener):
     def __init__(self, device):
         self.device = device
@@ -111,7 +147,7 @@ class ServerListener(Device.Listener, Connection.Listener):
 
 
 # -----------------------------------------------------------------------------
-def on_hid_control_point_write(connection, value):
+def on_hid_control_point_write(_connection, value):
     print(f'Control Point Write: {value}')
 
 
@@ -133,31 +169,41 @@ async def keyboard_host(device, peer_address):
         return
     await peer.discover_characteristics()
 
-    protocol_mode_characteristics = peer.get_characteristics_by_uuid(GATT_PROTOCOL_MODE_CHARACTERISTIC)
+    protocol_mode_characteristics = peer.get_characteristics_by_uuid(
+        GATT_PROTOCOL_MODE_CHARACTERISTIC
+    )
     if not protocol_mode_characteristics:
         print(color('!!! No Protocol Mode characteristic', 'red'))
         return
     protocol_mode_characteristic = protocol_mode_characteristics[0]
 
-    hid_information_characteristics = peer.get_characteristics_by_uuid(GATT_HID_INFORMATION_CHARACTERISTIC)
+    hid_information_characteristics = peer.get_characteristics_by_uuid(
+        GATT_HID_INFORMATION_CHARACTERISTIC
+    )
     if not hid_information_characteristics:
         print(color('!!! No HID Information characteristic', 'red'))
         return
     hid_information_characteristic = hid_information_characteristics[0]
 
-    report_map_characteristics = peer.get_characteristics_by_uuid(GATT_REPORT_MAP_CHARACTERISTIC)
+    report_map_characteristics = peer.get_characteristics_by_uuid(
+        GATT_REPORT_MAP_CHARACTERISTIC
+    )
     if not report_map_characteristics:
         print(color('!!! No Report Map characteristic', 'red'))
         return
     report_map_characteristic = report_map_characteristics[0]
 
-    control_point_characteristics = peer.get_characteristics_by_uuid(GATT_HID_CONTROL_POINT_CHARACTERISTIC)
+    control_point_characteristics = peer.get_characteristics_by_uuid(
+        GATT_HID_CONTROL_POINT_CHARACTERISTIC
+    )
     if not control_point_characteristics:
         print(color('!!! No Control Point characteristic', 'red'))
         return
     # control_point_characteristic = control_point_characteristics[0]
 
-    report_characteristics = peer.get_characteristics_by_uuid(GATT_REPORT_CHARACTERISTIC)
+    report_characteristics = peer.get_characteristics_by_uuid(
+        GATT_REPORT_CHARACTERISTIC
+    )
     if not report_characteristics:
         print(color('!!! No Report characteristic', 'red'))
         return
@@ -165,13 +211,20 @@ async def keyboard_host(device, peer_address):
         print(color('REPORT:', 'yellow'), characteristic)
         if characteristic.properties & Characteristic.NOTIFY:
             await peer.discover_descriptors(characteristic)
-            report_reference_descriptor = characteristic.get_descriptor(GATT_REPORT_REFERENCE_DESCRIPTOR)
+            report_reference_descriptor = characteristic.get_descriptor(
+                GATT_REPORT_REFERENCE_DESCRIPTOR
+            )
             if report_reference_descriptor:
                 report_reference = await peer.read_value(report_reference_descriptor)
                 print(color('  Report Reference:', 'blue'), report_reference.hex())
             else:
                 report_reference = bytes([0, 0])
-            await peer.subscribe(characteristic, lambda value, param=f'[{i}] {report_reference.hex()}': on_report(param, value))
+            await peer.subscribe(
+                characteristic,
+                lambda value, param=f'[{i}] {report_reference.hex()}': on_report(
+                    param, value
+                ),
+            )
 
     protocol_mode = await peer.read_value(protocol_mode_characteristic)
     print(f'Protocol Mode: {protocol_mode.hex()}')
@@ -192,23 +245,34 @@ async def keyboard_device(device, command):
         Characteristic.READABLE | Characteristic.WRITEABLE,
         bytes([0, 0, 0, 0, 0, 0, 0, 0]),
         [
-            Descriptor(GATT_REPORT_REFERENCE_DESCRIPTOR, Descriptor.READABLE, bytes([0x01, HID_INPUT_REPORT]))
-        ]
+            Descriptor(
+                GATT_REPORT_REFERENCE_DESCRIPTOR,
+                Descriptor.READABLE,
+                bytes([0x01, HID_INPUT_REPORT]),
+            )
+        ],
     )
 
     # Create an 'output report' characteristic to receive keyboard reports from the host
     output_report_characteristic = Characteristic(
         GATT_REPORT_CHARACTERISTIC,
-        Characteristic.READ | Characteristic.WRITE | Characteristic.WRITE_WITHOUT_RESPONSE,
+        Characteristic.READ
+        | Characteristic.WRITE
+        | Characteristic.WRITE_WITHOUT_RESPONSE,
         Characteristic.READABLE | Characteristic.WRITEABLE,
         bytes([0]),
         [
-            Descriptor(GATT_REPORT_REFERENCE_DESCRIPTOR, Descriptor.READABLE, bytes([0x01, HID_OUTPUT_REPORT]))
-        ]
+            Descriptor(
+                GATT_REPORT_REFERENCE_DESCRIPTOR,
+                Descriptor.READABLE,
+                bytes([0x01, HID_OUTPUT_REPORT]),
+            )
+        ],
     )
 
     # Add the services to the GATT sever
-    device.add_services([
+    device.add_services(
+        [
             Service(
                 GATT_DEVICE_INFORMATION_SERVICE,
                 [
@@ -216,9 +280,9 @@ async def keyboard_device(device, command):
                         GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
                         Characteristic.READ,
                         Characteristic.READABLE,
-                    'Bumble'
+                        'Bumble',
                     )
-            ]
+                ],
             ),
             Service(
                 GATT_HUMAN_INTERFACE_DEVICE_SERVICE,
@@ -227,29 +291,31 @@ async def keyboard_device(device, command):
                         GATT_PROTOCOL_MODE_CHARACTERISTIC,
                         Characteristic.READ,
                         Characteristic.READABLE,
-                    bytes([HID_REPORT_PROTOCOL])
+                        bytes([HID_REPORT_PROTOCOL]),
                     ),
                     Characteristic(
                         GATT_HID_INFORMATION_CHARACTERISTIC,
                         Characteristic.READ,
                         Characteristic.READABLE,
-                    bytes([0x11, 0x01, 0x00, 0x03])  # bcdHID=1.1, bCountryCode=0x00, Flags=RemoteWake|NormallyConnectable
+                        # bcdHID=1.1, bCountryCode=0x00,
+                        # Flags=RemoteWake|NormallyConnectable
+                        bytes([0x11, 0x01, 0x00, 0x03]),
                     ),
                     Characteristic(
                         GATT_HID_CONTROL_POINT_CHARACTERISTIC,
                         Characteristic.WRITE_WITHOUT_RESPONSE,
                         Characteristic.WRITEABLE,
-                    CharacteristicValue(write=on_hid_control_point_write)
+                        CharacteristicValue(write=on_hid_control_point_write),
                     ),
                     Characteristic(
                         GATT_REPORT_MAP_CHARACTERISTIC,
                         Characteristic.READ,
                         Characteristic.READABLE,
-                    HID_KEYBOARD_REPORT_MAP
+                        HID_KEYBOARD_REPORT_MAP,
                     ),
                     input_report_characteristic,
-                output_report_characteristic
-            ]
+                    output_report_characteristic,
+                ],
             ),
             Service(
                 GATT_BATTERY_SERVICE,
@@ -258,11 +324,12 @@ async def keyboard_device(device, command):
                         GATT_BATTERY_LEVEL_CHARACTERISTIC,
                         Characteristic.READ,
                         Characteristic.READABLE,
-                    bytes([100])
+                        bytes([100]),
                     )
+                ],
+            ),
         ]
     )
-    ])
 
     # Debug print
     for attribute in device.gatt_server.attributes:
@@ -270,13 +337,20 @@ async def keyboard_device(device, command):
 
     # Set the advertising data
     device.advertising_data = bytes(
-        AdvertisingData([
-            (AdvertisingData.COMPLETE_LOCAL_NAME, bytes('Bumble Keyboard', 'utf-8')),
-            (AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
-                bytes(GATT_HUMAN_INTERFACE_DEVICE_SERVICE)),
+        AdvertisingData(
+            [
+                (
+                    AdvertisingData.COMPLETE_LOCAL_NAME,
+                    bytes('Bumble Keyboard', 'utf-8'),
+                ),
+                (
+                    AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+                    bytes(GATT_HUMAN_INTERFACE_DEVICE_SERVICE),
+                ),
                 (AdvertisingData.APPEARANCE, struct.pack('<H', 0x03C1)),
-            (AdvertisingData.FLAGS, bytes([0x05]))
-        ])
+                (AdvertisingData.FLAGS, bytes([0x05])),
+            ]
+        )
     )
 
     # Attach a listener
@@ -288,7 +362,7 @@ async def keyboard_device(device, command):
 
     if command == 'web':
         # Start a Websocket server to receive events from a web page
-        async def serve(websocket, path):
+        async def serve(websocket, _path):
             while True:
                 try:
                     message = await websocket.recv()
@@ -301,16 +375,24 @@ async def keyboard_device(device, command):
                         key = parsed['key']
                         if len(key) == 1:
                             code = ord(key)
-                            if code >= ord('a') and code <= ord('z'):
+                            if ord('a') <= code <= ord('z'):
                                 hid_code = 0x04 + code - ord('a')
-                                input_report_characteristic.value = bytes([0, 0, hid_code, 0, 0, 0, 0, 0])
-                                await device.notify_subscribers(input_report_characteristic)
+                                input_report_characteristic.value = bytes(
+                                    [0, 0, hid_code, 0, 0, 0, 0, 0]
+                                )
+                                await device.notify_subscribers(
+                                    input_report_characteristic
+                                )
                     elif message_type == 'keyup':
-                        input_report_characteristic.value = bytes.fromhex('0000000000000000')
+                        input_report_characteristic.value = bytes.fromhex(
+                            '0000000000000000'
+                        )
                         await device.notify_subscribers(input_report_characteristic)
 
                 except websockets.exceptions.ConnectionClosedOK:
                     pass
+
+        # pylint: disable-next=no-member
         await websockets.serve(serve, 'localhost', 8989)
         await asyncio.get_event_loop().create_future()
     else:
@@ -321,7 +403,9 @@ async def keyboard_device(device, command):
 
                 # Keypress for the letter
                 keycode = 0x04 + letter - 0x61
-                input_report_characteristic.value = bytes([0, 0, keycode, 0, 0, 0, 0, 0])
+                input_report_characteristic.value = bytes(
+                    [0, 0, keycode, 0, 0, 0, 0, 0]
+                )
                 await device.notify_subscribers(input_report_characteristic)
 
                 # Key release
@@ -332,13 +416,20 @@ async def keyboard_device(device, command):
 # -----------------------------------------------------------------------------
 async def main():
     if len(sys.argv) < 4:
-        print('Usage: python keyboard.py <device-config> <transport-spec> <command>')
-        print('  where <command> is one of:')
-        print('  connect <address> (run a keyboard host, connecting to a keyboard)')
-        print('  web (run a keyboard with keypress input from a web page, see keyboard.html')
-        print('  sim (run a keyboard simulation, emitting a canned sequence of keystrokes')
+        print(
+            'Usage: python keyboard.py <device-config> <transport-spec> <command>'
+            '  where <command> is one of:\n'
+            '  connect <address> (run a keyboard host, connecting to a keyboard)\n'
+            '  web (run a keyboard with keypress input from a web page, '
+            'see keyboard.html\n'
+        )
+        print(
+            '  sim (run a keyboard simulation, emitting a canned sequence of keystrokes'
+        )
         print('example: python keyboard.py keyboard.json usb:0 sim')
-        print('example: python keyboard.py keyboard.json usb:0 connect A0:A1:A2:A3:A4:A5')
+        print(
+            'example: python keyboard.py keyboard.json usb:0 connect A0:A1:A2:A3:A4:A5'
+        )
         return
 
     async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
@@ -349,7 +440,7 @@ async def main():
         if command == 'connect':
             # Run as a Keyboard host
             await keyboard_host(device, sys.argv[4])
-        elif command in {'sim', 'web'}:
+        elif command in ('sim', 'web'):
             # Run as a keyboard device
             await keyboard_device(device, command)
 

examples/run_a2dp_info.py

@@ -27,12 +27,9 @@ from bumble.core import (
     BT_BR_EDR_TRANSPORT,
     BT_AVDTP_PROTOCOL_ID,
     BT_AUDIO_SINK_SERVICE,
-    BT_L2CAP_PROTOCOL_ID
-)
-from bumble.avdtp import (
-    Protocol as AVDTP_Protocol,
-    find_avdtp_service_with_connection
+    BT_L2CAP_PROTOCOL_ID,
 )
+from bumble.avdtp import Protocol as AVDTP_Protocol
 from bumble.a2dp import make_audio_source_service_sdp_records
 from bumble.sdp import (
     Client as SDP_Client,
@@ -40,7 +37,7 @@ from bumble.sdp import (
     DataElement,
     SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
     SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-    SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
+    SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
 )
 
 
@@ -48,11 +45,14 @@ from bumble.sdp import (
 def sdp_records():
     service_record_handle = 0x00010001
     return {
-        service_record_handle: make_audio_source_service_sdp_records(service_record_handle)
+        service_record_handle: make_audio_source_service_sdp_records(
+            service_record_handle
+        )
     }
 
 
 # -----------------------------------------------------------------------------
+# pylint: disable-next=too-many-nested-blocks
 async def find_a2dp_service(device, connection):
     # Connect to the SDP Server
     sdp_client = SDP_Client(device)
@@ -64,8 +64,8 @@ async def find_a2dp_service(device, connection):
         [
             SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
             SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
-            SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
-        ]
+            SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
+        ],
     )
 
     print(color('==================================', 'blue'))
@@ -78,8 +78,7 @@ async def find_a2dp_service(device, connection):
 
         # Service classes
         service_class_id_list = ServiceAttribute.find_attribute_in_list(
-            attribute_list,
-            SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
+            attribute_list, SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
         )
         if service_class_id_list:
             if service_class_id_list.value:
@@ -89,8 +88,7 @@ async def find_a2dp_service(device, connection):
 
         # Protocol info
         protocol_descriptor_list = ServiceAttribute.find_attribute_in_list(
-            attribute_list,
-            SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID
+            attribute_list, SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID
         )
         if protocol_descriptor_list:
             print(color('  Protocol:', 'green'))
@@ -103,27 +101,38 @@ async def find_a2dp_service(device, connection):
                     if len(protocol_descriptor.value) >= 2:
                         avdtp_version_major = protocol_descriptor.value[1].value >> 8
                         avdtp_version_minor = protocol_descriptor.value[1].value & 0xFF
-                        print(f'{color("    AVDTP Version:", "cyan")} {avdtp_version_major}.{avdtp_version_minor}')
+                        print(
+                            f'{color("    AVDTP Version:", "cyan")} '
+                            f'{avdtp_version_major}.{avdtp_version_minor}'
+                        )
                         service_version = (avdtp_version_major, avdtp_version_minor)
 
         # Profile info
         bluetooth_profile_descriptor_list = ServiceAttribute.find_attribute_in_list(
-            attribute_list,
-            SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID
+            attribute_list, SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID
         )
         if bluetooth_profile_descriptor_list:
             if bluetooth_profile_descriptor_list.value:
-                if bluetooth_profile_descriptor_list.value[0].type == DataElement.SEQUENCE:
-                    bluetooth_profile_descriptors = bluetooth_profile_descriptor_list.value
+                if (
+                    bluetooth_profile_descriptor_list.value[0].type
+                    == DataElement.SEQUENCE
+                ):
+                    bluetooth_profile_descriptors = (
+                        bluetooth_profile_descriptor_list.value
+                    )
                 else:
-                    # Sometimes, instead of a list of lists, we just find a list. Fix that
+                    # Sometimes, instead of a list of lists, we just find a list.
+                    # Fix that.
                     bluetooth_profile_descriptors = [bluetooth_profile_descriptor_list]
 
                 print(color('  Profiles:', 'green'))
                 for bluetooth_profile_descriptor in bluetooth_profile_descriptors:
                     version_major = bluetooth_profile_descriptor.value[1].value >> 8
                     version_minor = bluetooth_profile_descriptor.value[1].value & 0xFF
-                    print(f'    {bluetooth_profile_descriptor.value[0].value} - version {version_major}.{version_minor}')
+                    print(
+                        f'    {bluetooth_profile_descriptor.value[0].value}'
+                        f' - version {version_major}.{version_minor}'
+                    )
 
     await sdp_client.disconnect()
     return service_version
@@ -147,7 +156,8 @@ async def main():
         # Start the controller
         await device.power_on()
 
-        # Setup the SDP to expose a SRC service, in case the remote device queries us back
+        # Setup the SDP to expose a SRC service, in case the remote device queries us
+        # back
         device.sdp_service_records = sdp_records()
 
         # Connect to a peer

examples/run_a2dp_sink.py

@@ -20,7 +20,6 @@ import sys
 import os
 import logging
 
-from colors import color
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
 from bumble.core import BT_BR_EDR_TRANSPORT
@@ -28,7 +27,7 @@ from bumble.avdtp import (
     AVDTP_AUDIO_MEDIA_TYPE,
     Protocol,
     Listener,
-    MediaCodecCapabilities
+    MediaCodecCapabilities,
 )
 from bumble.a2dp import (
     make_audio_sink_service_sdp_records,
@@ -39,19 +38,19 @@ from bumble.a2dp import (
     SBC_LOUDNESS_ALLOCATION_METHOD,
     SBC_STEREO_CHANNEL_MODE,
     SBC_JOINT_STEREO_CHANNEL_MODE,
-    SbcMediaCodecInformation
+    SbcMediaCodecInformation,
 )
 
-Context = {
-    'output': None
-}
+Context = {'output': None}
 
 
 # -----------------------------------------------------------------------------
 def sdp_records():
     service_record_handle = 0x00010001
     return {
-        service_record_handle: make_audio_sink_service_sdp_records(service_record_handle)
+        service_record_handle: make_audio_sink_service_sdp_records(
+            service_record_handle
+        )
     }
 
 
@@ -67,14 +66,17 @@ def codec_capabilities():
                 SBC_MONO_CHANNEL_MODE,
                 SBC_DUAL_CHANNEL_MODE,
                 SBC_STEREO_CHANNEL_MODE,
-                SBC_JOINT_STEREO_CHANNEL_MODE
+                SBC_JOINT_STEREO_CHANNEL_MODE,
             ],
             block_lengths=[4, 8, 12, 16],
             subbands=[4, 8],
-            allocation_methods    = [SBC_LOUDNESS_ALLOCATION_METHOD, SBC_SNR_ALLOCATION_METHOD],
+            allocation_methods=[
+                SBC_LOUDNESS_ALLOCATION_METHOD,
+                SBC_SNR_ALLOCATION_METHOD,
+            ],
             minimum_bitpool_value=2,
-            maximum_bitpool_value = 53
-        )
+            maximum_bitpool_value=53,
+        ),
     )
 
 
@@ -89,8 +91,8 @@ def on_avdtp_connection(server):
 def on_rtp_packet(packet):
     header = packet.payload[0]
     fragmented = header >> 7
-    start            = (header >> 6) & 0x01
-    last             = (header >> 5) & 0x01
+    # start = (header >> 6) & 0x01
+    # last = (header >> 5) & 0x01
     number_of_frames = header & 0x0F
 
     if fragmented:
@@ -104,7 +106,10 @@ def on_rtp_packet(packet):
 # -----------------------------------------------------------------------------
 async def main():
     if len(sys.argv) < 4:
-        print('Usage: run_a2dp_sink.py <device-config> <transport-spec> <sbc-file> [<bt-addr>]')
+        print(
+            'Usage: run_a2dp_sink.py <device-config> <transport-spec> <sbc-file> '
+            '[<bt-addr>]'
+        )
         print('example: run_a2dp_sink.py classic1.json usb:0 output.sbc')
         return
 
@@ -133,7 +138,9 @@ async def main():
                 # Connect to the source
                 target_address = sys.argv[4]
                 print(f'=== Connecting to {target_address}...')
-                connection = await device.connect(target_address, transport=BT_BR_EDR_TRANSPORT)
+                connection = await device.connect(
+                    target_address, transport=BT_BR_EDR_TRANSPORT
+                )
                 print(f'=== Connected to {connection.peer_address}!')
 
                 # Request authentication

examples/run_a2dp_source.py

@@ -30,7 +30,7 @@ from bumble.avdtp import (
     MediaCodecCapabilities,
     MediaPacketPump,
     Protocol,
-    Listener
+    Listener,
 )
 from bumble.a2dp import (
     SBC_JOINT_STEREO_CHANNEL_MODE,
@@ -38,7 +38,7 @@ from bumble.a2dp import (
     make_audio_source_service_sdp_records,
     A2DP_SBC_CODEC_TYPE,
     SbcMediaCodecInformation,
-    SbcPacketSource
+    SbcPacketSource,
 )
 
 
@@ -46,13 +46,16 @@ from bumble.a2dp import (
 def sdp_records():
     service_record_handle = 0x00010001
     return {
-        service_record_handle: make_audio_source_service_sdp_records(service_record_handle)
+        service_record_handle: make_audio_source_service_sdp_records(
+            service_record_handle
+        )
     }
 
 
 # -----------------------------------------------------------------------------
 def codec_capabilities():
-    # NOTE: this shouldn't be hardcoded, but should be inferred from the input file instead
+    # NOTE: this shouldn't be hardcoded, but should be inferred from the input file
+    # instead
     return MediaCodecCapabilities(
         media_type=AVDTP_AUDIO_MEDIA_TYPE,
         media_codec_type=A2DP_SBC_CODEC_TYPE,
@@ -63,14 +66,16 @@ def codec_capabilities():
             subbands=8,
             allocation_method=SBC_LOUDNESS_ALLOCATION_METHOD,
             minimum_bitpool_value=2,
-            maximum_bitpool_value = 53
-        )
+            maximum_bitpool_value=53,
+        ),
     )
 
 
 # -----------------------------------------------------------------------------
 def on_avdtp_connection(read_function, protocol):
-    packet_source = SbcPacketSource(read_function, protocol.l2cap_channel.mtu, codec_capabilities())
+    packet_source = SbcPacketSource(
+        read_function, protocol.l2cap_channel.mtu, codec_capabilities()
+    )
     packet_pump = MediaPacketPump(packet_source.packets)
     protocol.add_source(packet_source.codec_capabilities, packet_pump)
 
@@ -83,14 +88,18 @@ async def stream_packets(read_function, protocol):
         print('@@@', endpoint)
 
     # Select a sink
-    sink = protocol.find_remote_sink_by_codec(AVDTP_AUDIO_MEDIA_TYPE, A2DP_SBC_CODEC_TYPE)
+    sink = protocol.find_remote_sink_by_codec(
+        AVDTP_AUDIO_MEDIA_TYPE, A2DP_SBC_CODEC_TYPE
+    )
     if sink is None:
         print(color('!!! no SBC sink found', 'red'))
         return
     print(f'### Selected sink: {sink.seid}')
 
     # Stream the packets
-    packet_source = SbcPacketSource(read_function, protocol.l2cap_channel.mtu, codec_capabilities())
+    packet_source = SbcPacketSource(
+        read_function, protocol.l2cap_channel.mtu, codec_capabilities()
+    )
     packet_pump = MediaPacketPump(packet_source.packets)
     source = protocol.add_source(packet_source.codec_capabilities, packet_pump)
     stream = await protocol.create_stream(source, sink)
@@ -107,8 +116,13 @@ async def stream_packets(read_function, protocol):
 # -----------------------------------------------------------------------------
 async def main():
     if len(sys.argv) < 4:
-        print('Usage: run_a2dp_source.py <device-config> <transport-spec> <sbc-file> [<bluetooth-address>]')
-        print('example: run_a2dp_source.py classic1.json usb:0 test.sbc E1:CA:72:48:C4:E8')
+        print(
+            'Usage: run_a2dp_source.py <device-config> <transport-spec> <sbc-file> '
+            '[<bluetooth-address>]'
+        )
+        print(
+            'example: run_a2dp_source.py classic1.json usb:0 test.sbc E1:CA:72:48:C4:E8'
+        )
         return
 
     print('<<< connecting to HCI...')
@@ -126,7 +140,8 @@ async def main():
         await device.power_on()
 
         with open(sys.argv[3], 'rb') as sbc_file:
-            # NOTE: this should be using asyncio file reading, but blocking reads are good enough for testing
+            # NOTE: this should be using asyncio file reading, but blocking reads are
+            # good enough for testing
             async def read(byte_count):
                 return sbc_file.read(byte_count)
 
@@ -134,7 +149,9 @@ async def main():
                 # Connect to a peer
                 target_address = sys.argv[4]
                 print(f'=== Connecting to {target_address}...')
-                connection = await device.connect(target_address, transport=BT_BR_EDR_TRANSPORT)
+                connection = await device.connect(
+                    target_address, transport=BT_BR_EDR_TRANSPORT
+                )
                 print(f'=== Connected to {connection.peer_address}!')
 
                 # Request authentication
@@ -148,7 +165,9 @@ async def main():
                 print('*** Encryption on')
 
                 # Look for an A2DP service
-                avdtp_version = await find_avdtp_service_with_connection(device, connection)
+                avdtp_version = await find_avdtp_service_with_connection(
+                    device, connection
+                )
                 if not avdtp_version:
                     print(color('!!! no A2DP service found'))
                     return
@@ -161,7 +180,9 @@ async def main():
             else:
                 # Create a listener to wait for AVDTP connections
                 listener = Listener(Listener.create_registrar(device), version=(1, 2))
-                listener.on('connection', lambda protocol: on_avdtp_connection(read, protocol))
+                listener.on(
+                    'connection', lambda protocol: on_avdtp_connection(read, protocol)
+                )
 
                 # Become connectable and wait for a connection
                 await device.set_discoverable(True)

examples/run_advertiser.py

@@ -16,21 +16,21 @@
 # Imports
 # -----------------------------------------------------------------------------
 import asyncio
+import logging
 import sys
 import os
+from bumble.device import AdvertisingType, Device
+from bumble.hci import Address
 
-from bumble.hci import *
-from bumble.controller import *
-from bumble.device import *
-from bumble.transport import *
-from bumble.host import *
 from bumble.transport import open_transport_or_link
 
 
 # -----------------------------------------------------------------------------
 async def main():
     if len(sys.argv) < 3:
-        print('Usage: run_advertiser.py <config-file> <transport-spec> [type] [address]')
+        print(
+            'Usage: run_advertiser.py <config-file> <transport-spec> [type] [address]'
+        )
         print('example: run_advertiser.py device1.json usb:0')
         return
 
@@ -56,6 +56,7 @@ async def main():
         await device.start_advertising(advertising_type=advertising_type, target=target)
         await hci_source.wait_for_termination()
 
+
 # -----------------------------------------------------------------------------
 logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
 asyncio.run(main())