improve exception messages

add snoop support

.vscode/settings.json

@@ -71,5 +71,10 @@
         "editor.rulers": [88]
     },
     "python.formatting.provider": "black",
-    "pylint.importStrategy": "useBundled"
+    "pylint.importStrategy": "useBundled",
+    "python.testing.pytestArgs": [
+        "."
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
 }

apps/console.py

@@ -27,7 +27,6 @@ import re
 from collections import OrderedDict
 
 import click
-import colors
 
 from prompt_toolkit import Application
 from prompt_toolkit.history import FileHistory
@@ -53,6 +52,7 @@ from prompt_toolkit.layout import (
 
 from bumble import __version__
 import bumble.core
+from bumble import colors
 from bumble.core import UUID, AdvertisingData, BT_LE_TRANSPORT
 from bumble.device import ConnectionParametersPreferences, Device, Connection, Peer
 from bumble.utils import AsyncRunner

apps/controller_info.py

@@ -19,9 +19,9 @@ import asyncio
 import os
 import logging
 import click
-from colors import color
 from bumble.company_ids import COMPANY_IDENTIFIERS
 
+from bumble.colors import color
 from bumble.core import name_or_number
 from bumble.hci import (
     map_null_terminated_utf8_string,

apps/gatt_dump.py

@@ -19,9 +19,9 @@ import asyncio
 import os
 import logging
 import click
-from colors import color
 
 import bumble.core
+from bumble.colors import color
 from bumble.device import Device, Peer
 from bumble.gatt import show_services
 from bumble.transport import open_transport_or_link

apps/gg_bridge.py

@@ -20,8 +20,8 @@ import os
 import struct
 import logging
 import click
-from colors import color
 
+from bumble.colors import color
 from bumble.device import Device, Peer
 from bumble.core import AdvertisingData
 from bumble.gatt import Service, Characteristic, CharacteristicValue

apps/l2cap_bridge.py

@@ -19,8 +19,8 @@ import asyncio
 import logging
 import os
 import click
-from colors import color
 
+from bumble.colors import color
 from bumble.transport import open_transport_or_link
 from bumble.device import Device
 from bumble.utils import FlowControlAsyncPipe

apps/link_relay/link_relay.py

@@ -23,9 +23,10 @@ import argparse
 import uuid
 import os
 from urllib.parse import urlparse
-from colors import color
 import websockets
 
+from bumble.colors import color
+
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------

apps/pair.py

@@ -19,9 +19,9 @@ import asyncio
 import os
 import logging
 import click
-import aioconsole
-from colors import color
+from prompt_toolkit.shortcuts import PromptSession
 
+from bumble.colors import color
 from bumble.device import Device, Peer
 from bumble.transport import open_transport_or_link
 from bumble.smp import PairingDelegate, PairingConfig
@@ -42,9 +42,23 @@ from bumble.att import (
 )
 
 
+# -----------------------------------------------------------------------------
+class Waiter:
+    instance = None
+
+    def __init__(self):
+        self.done = asyncio.get_running_loop().create_future()
+
+    def terminate(self):
+        self.done.set_result(None)
+
+    async def wait_until_terminated(self):
+        return await self.done
+
+
 # -----------------------------------------------------------------------------
 class Delegate(PairingDelegate):
-    def __init__(self, mode, connection, capability_string, prompt):
+    def __init__(self, mode, connection, capability_string, do_prompt):
         super().__init__(
             {
                 'keyboard': PairingDelegate.KEYBOARD_INPUT_ONLY,
@@ -58,7 +72,18 @@ class Delegate(PairingDelegate):
         self.mode = mode
         self.peer = Peer(connection)
         self.peer_name = None
-        self.prompt = prompt
+        self.do_prompt = do_prompt
+
+    def print(self, message):
+        print(color(message, 'yellow'))
+
+    async def prompt(self, message):
+        # Wait a bit to allow some of the log lines to print before we prompt
+        await asyncio.sleep(1)
+
+        session = PromptSession(message)
+        response = await session.prompt_async()
+        return response.lower().strip()
 
     async def update_peer_name(self):
         if self.peer_name is not None:
@@ -73,19 +98,15 @@ class Delegate(PairingDelegate):
             self.peer_name = '[?]'
 
     async def accept(self):
-        if self.prompt:
+        if self.do_prompt:
             await self.update_peer_name()
 
-            # Wait a bit to allow some of the log lines to print before we prompt
-            await asyncio.sleep(1)
-
             # Prompt for acceptance
-            print(color('###-----------------------------------', 'yellow'))
-            print(color(f'### Pairing request from {self.peer_name}', 'yellow'))
-            print(color('###-----------------------------------', 'yellow'))
+            self.print('###-----------------------------------')
+            self.print(f'### Pairing request from {self.peer_name}')
+            self.print('###-----------------------------------')
             while True:
-                response = await aioconsole.ainput(color('>>> Accept? ', 'yellow'))
-                response = response.lower().strip()
+                response = await self.prompt('>>> Accept? ')
 
                 if response == 'yes':
                     return True
@@ -96,23 +117,17 @@ class Delegate(PairingDelegate):
         # Accept silently
         return True
 
-    async def compare_numbers(self, number, digits=6):
+    async def compare_numbers(self, number, digits):
         await self.update_peer_name()
 
-        # Wait a bit to allow some of the log lines to print before we prompt
-        await asyncio.sleep(1)
-
         # Prompt for a numeric comparison
-        print(color('###-----------------------------------', 'yellow'))
-        print(color(f'### Pairing with {self.peer_name}', 'yellow'))
-        print(color('###-----------------------------------', 'yellow'))
+        self.print('###-----------------------------------')
+        self.print(f'### Pairing with {self.peer_name}')
+        self.print('###-----------------------------------')
         while True:
-            response = await aioconsole.ainput(
-                color(
-                    f'>>> Does the other device display {number:0{digits}}? ', 'yellow'
-                )
+            response = await self.prompt(
+                f'>>> Does the other device display {number:0{digits}}? '
             )
-            response = response.lower().strip()
 
             if response == 'yes':
                 return True
@@ -123,30 +138,24 @@ class Delegate(PairingDelegate):
     async def get_number(self):
         await self.update_peer_name()
 
-        # Wait a bit to allow some of the log lines to print before we prompt
-        await asyncio.sleep(1)
-
         # Prompt for a PIN
         while True:
             try:
-                print(color('###-----------------------------------', 'yellow'))
-                print(color(f'### Pairing with {self.peer_name}', 'yellow'))
-                print(color('###-----------------------------------', 'yellow'))
-                return int(await aioconsole.ainput(color('>>> Enter PIN: ', 'yellow')))
+                self.print('###-----------------------------------')
+                self.print(f'### Pairing with {self.peer_name}')
+                self.print('###-----------------------------------')
+                return int(await self.prompt('>>> Enter PIN: '))
             except ValueError:
                 pass
 
-    async def display_number(self, number, digits=6):
+    async def display_number(self, number, digits):
         await self.update_peer_name()
 
-        # Wait a bit to allow some of the log lines to print before we prompt
-        await asyncio.sleep(1)
-
         # Display a PIN code
-        print(color('###-----------------------------------', 'yellow'))
-        print(color(f'### Pairing with {self.peer_name}', 'yellow'))
-        print(color(f'### PIN: {number:0{digits}}', 'yellow'))
-        print(color('###-----------------------------------', 'yellow'))
+        self.print('###-----------------------------------')
+        self.print(f'### Pairing with {self.peer_name}')
+        self.print(f'### PIN: {number:0{digits}}')
+        self.print('###-----------------------------------')
 
 
 # -----------------------------------------------------------------------------
@@ -238,6 +247,7 @@ def on_pairing(keys):
     print(color('*** Paired!', 'cyan'))
     keys.print(prefix=color('*** ', 'cyan'))
     print(color('***-----------------------------------', 'cyan'))
+    Waiter.instance.terminate()
 
 
 # -----------------------------------------------------------------------------
@@ -245,6 +255,7 @@ def on_pairing_failure(reason):
     print(color('***-----------------------------------', 'red'))
     print(color(f'*** Pairing failed: {smp_error_name(reason)}', 'red'))
     print(color('***-----------------------------------', 'red'))
+    Waiter.instance.terminate()
 
 
 # -----------------------------------------------------------------------------
@@ -262,6 +273,8 @@ async def pair(
     hci_transport,
     address_or_name,
 ):
+    Waiter.instance = Waiter()
+
     print('<<< connecting to HCI...')
     async with await open_transport_or_link(hci_transport) as (hci_source, hci_sink):
         print('<<< connected')
@@ -332,7 +345,19 @@ async def pair(
             # Advertise so that peers can find us and connect
             await device.start_advertising(auto_restart=True)
 
-        await hci_source.wait_for_termination()
+        # Run until the user asks to exit
+        await Waiter.instance.wait_until_terminated()
+
+
+# -----------------------------------------------------------------------------
+class LogHandler(logging.Handler):
+    def __init__(self):
+        super().__init__()
+        self.setFormatter(logging.Formatter('%(levelname)s:%(name)s:%(message)s'))
+
+    def emit(self, record):
+        message = self.format(record)
+        print(message)
 
 
 # -----------------------------------------------------------------------------
@@ -388,7 +413,13 @@ def main(
     hci_transport,
     address_or_name,
 ):
-    logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
+    # Setup logging
+    log_handler = LogHandler()
+    root_logger = logging.getLogger()
+    root_logger.addHandler(log_handler)
+    root_logger.setLevel(os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
+
+    # Pair
     asyncio.run(
         pair(
             mode,

apps/scan.py

@@ -19,8 +19,8 @@ import asyncio
 import os
 import logging
 import click
-from colors import color
 
+from bumble.colors import color
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
 from bumble.keys import JsonKeyStore

apps/show.py

@@ -17,8 +17,8 @@
 # -----------------------------------------------------------------------------
 import struct
 import click
-from colors import color
 
+from bumble.colors import color
 from bumble import hci
 from bumble.transport.common import PacketReader
 from bumble.helpers import PacketTracer

apps/usb_probe.py

@@ -30,8 +30,8 @@ import os
 import logging
 import click
 import usb1
-from colors import color
 
+from bumble.colors import color
 from bumble.transport.usb import load_libusb
 
 

bumble/a2dp.py

@@ -18,7 +18,6 @@
 import struct
 import logging
 from collections import namedtuple
-import construct
 
 from .company_ids import COMPANY_IDENTIFIERS
 from .sdp import (
@@ -258,17 +257,6 @@ class SbcMediaCodecInformation(
     A2DP spec - 4.3.2 Codec Specific Information Elements
     '''
 
-    BIT_FIELDS = construct.Bitwise(
-        construct.Sequence(
-            construct.BitsInteger(4),
-            construct.BitsInteger(4),
-            construct.BitsInteger(4),
-            construct.BitsInteger(2),
-            construct.BitsInteger(2),
-            construct.BitsInteger(8),
-            construct.BitsInteger(8),
-        )
-    )
     SAMPLING_FREQUENCY_BITS = {16000: 1 << 3, 32000: 1 << 2, 44100: 1 << 1, 48000: 1}
     CHANNEL_MODE_BITS = {
         SBC_MONO_CHANNEL_MODE: 1 << 3,
@@ -284,9 +272,22 @@ class SbcMediaCodecInformation(
     }
 
     @staticmethod
-    def from_bytes(data):
+    def from_bytes(data: bytes) -> 'SbcMediaCodecInformation':
+        sampling_frequency = (data[0] >> 4) & 0x0F
+        channel_mode = (data[0] >> 0) & 0x0F
+        block_length = (data[1] >> 4) & 0x0F
+        subbands = (data[1] >> 2) & 0x03
+        allocation_method = (data[1] >> 0) & 0x03
+        minimum_bitpool_value = (data[2] >> 0) & 0xFF
+        maximum_bitpool_value = (data[3] >> 0) & 0xFF
         return SbcMediaCodecInformation(
-            *SbcMediaCodecInformation.BIT_FIELDS.parse(data)
+            sampling_frequency,
+            channel_mode,
+            block_length,
+            subbands,
+            allocation_method,
+            minimum_bitpool_value,
+            maximum_bitpool_value,
         )
 
     @classmethod
@@ -335,8 +336,17 @@ class SbcMediaCodecInformation(
             maximum_bitpool_value=maximum_bitpool_value,
         )
 
-    def __bytes__(self):
-        return self.BIT_FIELDS.build(self)
+    def __bytes__(self) -> bytes:
+        return bytes(
+            [
+                (self.sampling_frequency << 4) | self.channel_mode,
+                (self.block_length << 4)
+                | (self.subbands << 2)
+                | self.allocation_method,
+                self.minimum_bitpool_value,
+                self.maximum_bitpool_value,
+            ]
+        )
 
     def __str__(self):
         channel_modes = ['MONO', 'DUAL_CHANNEL', 'STEREO', 'JOINT_STEREO']
@@ -367,16 +377,6 @@ class AacMediaCodecInformation(
     A2DP spec - 4.5.2 Codec Specific Information Elements
     '''
 
-    BIT_FIELDS = construct.Bitwise(
-        construct.Sequence(
-            construct.BitsInteger(8),
-            construct.BitsInteger(12),
-            construct.BitsInteger(2),
-            construct.BitsInteger(2),
-            construct.BitsInteger(1),
-            construct.BitsInteger(23),
-        )
-    )
     OBJECT_TYPE_BITS = {
         MPEG_2_AAC_LC_OBJECT_TYPE: 1 << 7,
         MPEG_4_AAC_LC_OBJECT_TYPE: 1 << 6,
@@ -400,9 +400,15 @@ class AacMediaCodecInformation(
     CHANNELS_BITS = {1: 1 << 1, 2: 1}
 
     @staticmethod
-    def from_bytes(data):
+    def from_bytes(data: bytes) -> 'AacMediaCodecInformation':
+        object_type = data[0]
+        sampling_frequency = (data[1] << 4) | ((data[2] >> 4) & 0x0F)
+        channels = (data[2] >> 2) & 0x03
+        rfa = 0
+        vbr = (data[3] >> 7) & 0x01
+        bitrate = ((data[3] & 0x7F) << 16) | (data[4] << 8) | data[5]
         return AacMediaCodecInformation(
-            *AacMediaCodecInformation.BIT_FIELDS.parse(data)
+            object_type, sampling_frequency, channels, rfa, vbr, bitrate
         )
 
     @classmethod
@@ -430,8 +436,17 @@ class AacMediaCodecInformation(
             bitrate=bitrate,
         )
 
-    def __bytes__(self):
-        return self.BIT_FIELDS.build(self)
+    def __bytes__(self) -> bytes:
+        return bytes(
+            [
+                self.object_type & 0xFF,
+                (self.sampling_frequency >> 4) & 0xFF,
+                (((self.sampling_frequency & 0x0F) << 4) | (self.channels << 2)) & 0xFF,
+                ((self.vbr << 7) | ((self.bitrate >> 16) & 0x7F)) & 0xFF,
+                ((self.bitrate >> 8) & 0xFF) & 0xFF,
+                self.bitrate & 0xFF,
+            ]
+        )
 
     def __str__(self):
         object_types = [

bumble/att.py

@@ -24,13 +24,15 @@
 # -----------------------------------------------------------------------------
 from __future__ import annotations
 import struct
-from colors import color
 from pyee import EventEmitter
-from typing import Dict, Type
+from typing import Dict, Type, TYPE_CHECKING
 
 from bumble.core import UUID, name_or_number
 from bumble.hci import HCI_Object, key_with_value
+from bumble.colors import color
 
+if TYPE_CHECKING:
+    from bumble.device import Connection
 
 # -----------------------------------------------------------------------------
 # Constants
@@ -749,7 +751,25 @@ class Attribute(EventEmitter):
     def decode_value(self, value_bytes):
         return value_bytes
 
-    def read_value(self, connection):
+    def read_value(self, connection: Connection):
+        if (
+            self.permissions & self.READ_REQUIRES_ENCRYPTION
+        ) and not connection.encryption:
+            raise ATT_Error(
+                error_code=ATT_INSUFFICIENT_ENCRYPTION_ERROR, att_handle=self.handle
+            )
+        if (
+            self.permissions & self.READ_REQUIRES_AUTHENTICATION
+        ) and not connection.authenticated:
+            raise ATT_Error(
+                error_code=ATT_INSUFFICIENT_AUTHENTICATION_ERROR, att_handle=self.handle
+            )
+        if self.permissions & self.READ_REQUIRES_AUTHORIZATION:
+            # TODO: handle authorization better
+            raise ATT_Error(
+                error_code=ATT_INSUFFICIENT_AUTHORIZATION_ERROR, att_handle=self.handle
+            )
+
         if read := getattr(self.value, 'read', None):
             try:
                 value = read(connection)  # pylint: disable=not-callable
@@ -762,7 +782,25 @@ class Attribute(EventEmitter):
 
         return self.encode_value(value)
 
-    def write_value(self, connection, value_bytes):
+    def write_value(self, connection: Connection, value_bytes):
+        if (
+            self.permissions & self.WRITE_REQUIRES_ENCRYPTION
+        ) and not connection.encryption:
+            raise ATT_Error(
+                error_code=ATT_INSUFFICIENT_ENCRYPTION_ERROR, att_handle=self.handle
+            )
+        if (
+            self.permissions & self.WRITE_REQUIRES_AUTHENTICATION
+        ) and not connection.authenticated:
+            raise ATT_Error(
+                error_code=ATT_INSUFFICIENT_AUTHENTICATION_ERROR, att_handle=self.handle
+            )
+        if self.permissions & self.WRITE_REQUIRES_AUTHORIZATION:
+            # TODO: handle authorization better
+            raise ATT_Error(
+                error_code=ATT_INSUFFICIENT_AUTHORIZATION_ERROR, att_handle=self.handle
+            )
+
         value = self.decode_value(value_bytes)
 
         if write := getattr(self.value, 'write', None):

bumble/avdtp.py

@@ -20,7 +20,6 @@ import asyncio
 import struct
 import time
 import logging
-from colors import color
 from pyee import EventEmitter
 from typing import Dict, Type
 
@@ -40,6 +39,7 @@ from .a2dp import (
     VendorSpecificMediaCodecInformation,
 )
 from . import sdp
+from .colors import color
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/colors.py

@@ -0,0 +1,103 @@
+# Copyright (c) 2012 Giorgos Verigakis <verigak@gmail.com>
+#
+# Permission to use, copy, modify, and distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+from functools import partial
+from typing import List, Optional, Union
+
+
+# ANSI color names. There is also a "default"
+COLORS = ('black', 'red', 'green', 'yellow', 'blue', 'magenta', 'cyan', 'white')
+
+# ANSI style names
+STYLES = (
+    'none',
+    'bold',
+    'faint',
+    'italic',
+    'underline',
+    'blink',
+    'blink2',
+    'negative',
+    'concealed',
+    'crossed',
+)
+
+
+ColorSpec = Union[str, int]
+
+
+def _join(*values: ColorSpec) -> str:
+    return ';'.join(str(v) for v in values)
+
+
+def _color_code(spec: ColorSpec, base: int) -> str:
+    if isinstance(spec, str):
+        spec = spec.strip().lower()
+
+    if spec == 'default':
+        return _join(base + 9)
+    elif spec in COLORS:
+        return _join(base + COLORS.index(spec))
+    elif isinstance(spec, int) and 0 <= spec <= 255:
+        return _join(base + 8, 5, spec)
+    else:
+        raise ValueError('Invalid color spec "%s"' % spec)
+
+
+def color(
+    s: str,
+    fg: Optional[ColorSpec] = None,
+    bg: Optional[ColorSpec] = None,
+    style: Optional[str] = None,
+) -> str:
+    codes: List[ColorSpec] = []
+
+    if fg:
+        codes.append(_color_code(fg, 30))
+    if bg:
+        codes.append(_color_code(bg, 40))
+    if style:
+        for style_part in style.split('+'):
+            if style_part in STYLES:
+                codes.append(STYLES.index(style_part))
+            else:
+                raise ValueError('Invalid style "%s"' % style_part)
+
+    if codes:
+        return '\x1b[{0}m{1}\x1b[0m'.format(_join(*codes), s)
+    else:
+        return s
+
+
+# Foreground color shortcuts
+black = partial(color, fg='black')
+red = partial(color, fg='red')
+green = partial(color, fg='green')
+yellow = partial(color, fg='yellow')
+blue = partial(color, fg='blue')
+magenta = partial(color, fg='magenta')
+cyan = partial(color, fg='cyan')
+white = partial(color, fg='white')
+
+# Style shortcuts
+bold = partial(color, style='bold')
+none = partial(color, style='none')
+faint = partial(color, style='faint')
+italic = partial(color, style='italic')
+underline = partial(color, style='underline')
+blink = partial(color, style='blink')
+blink2 = partial(color, style='blink2')
+negative = partial(color, style='negative')
+concealed = partial(color, style='concealed')
+crossed = partial(color, style='crossed')

bumble/controller.py

@@ -20,7 +20,7 @@ import asyncio
 import itertools
 import random
 import struct
-from colors import color
+from bumble.colors import color
 from bumble.core import BT_CENTRAL_ROLE, BT_PERIPHERAL_ROLE
 
 from bumble.hci import (

bumble/core.py

@@ -144,9 +144,12 @@ class ConnectionError(BaseError):  # pylint: disable=redefined-builtin
 class UUID:
     '''
     See Bluetooth spec Vol 3, Part B - 2.5.1 UUID
+
+    Note that this class expects and works in little-endian byte-order throughout.
+    The exception is when interacting with strings, which are in big-endian byte-order.
     '''
 
-    BASE_UUID = bytes.fromhex('00001000800000805F9B34FB')
+    BASE_UUID = bytes.fromhex('00001000800000805F9B34FB')[::-1]  # little-endian
     UUIDS: List[UUID] = []  # Registry of all instances created
 
     def __init__(self, uuid_str_or_int, name=None):
@@ -209,13 +212,20 @@ class UUID:
         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:
+        '''
+        Serialize UUID in little-endian byte-order
+        '''
+        if not force_128:
             return self.uuid_bytes
 
-        if len(self.uuid_bytes) == 4:
-            return self.uuid_bytes + UUID.BASE_UUID
-
-        return self.uuid_bytes + bytes([0, 0]) + UUID.BASE_UUID
+        if len(self.uuid_bytes) == 2:
+            return self.BASE_UUID + self.uuid_bytes + bytes([0, 0])
+        elif len(self.uuid_bytes) == 4:
+            return self.BASE_UUID + self.uuid_bytes
+        elif len(self.uuid_bytes) == 16:
+            return self.uuid_bytes
+        else:
+            assert False, "unreachable"
 
     def to_pdu_bytes(self):
         '''

bumble/device.py

@@ -25,8 +25,7 @@ from contextlib import asynccontextmanager, AsyncExitStack
 from dataclasses import dataclass
 from typing import Any, ClassVar, Dict, List, Optional, Tuple, Union
 
-from colors import color
-
+from .colors import color
 from .att import ATT_CID, ATT_DEFAULT_MTU, ATT_PDU
 from .gatt import Characteristic, Descriptor, Service
 from .hci import (
@@ -535,6 +534,9 @@ class Connection(CompositeEventEmitter):
         def on_connection_parameters_update_failure(self, error):
             pass
 
+        def on_connection_data_length_change(self):
+            pass
+
         def on_connection_phy_update(self):
             pass
 
@@ -1827,7 +1829,7 @@ class Device(CompositeEventEmitter):
         set.
 
         Notes:
-          * A `connect` to the same peer will also complete this call.
+          * A `connect` to the same peer will not complete this call.
           * The `timeout` parameter is only handled while waiting for the connection
             request, once received and accepted, the controller shall issue a connection
             complete event.
@@ -2009,7 +2011,7 @@ class Device(CompositeEventEmitter):
         NOTE: the name of the parameters may look odd, but it just follows the names
         used in the Bluetooth spec.
         '''
-        await self.send_command(
+        result = await self.send_command(
             HCI_LE_Connection_Update_Command(
                 connection_handle=connection.handle,
                 connection_interval_min=connection_interval_min,
@@ -2018,9 +2020,10 @@ class Device(CompositeEventEmitter):
                 supervision_timeout=supervision_timeout,
                 min_ce_length=min_ce_length,
                 max_ce_length=max_ce_length,
-            ),
-            check_result=True,
+            )
         )
+        if result.status != HCI_Command_Status_Event.PENDING:
+            raise HCI_StatusError(result)
 
     async def get_connection_rssi(self, connection):
         result = await self.send_command(
@@ -2409,16 +2412,6 @@ class Device(CompositeEventEmitter):
             )
             self.connections[connection_handle] = connection
 
-            # We may have an accept ongoing waiting for a connection request for
-            # `peer_address`.
-            # Typically happen when using `connect` to the same `peer_address` we are
-            # waiting for with an `accept`.
-            # In this case, set the completed `connection` to the `accept` future
-            # result.
-            if peer_address in self.classic_pending_accepts:
-                future, *_ = self.classic_pending_accepts.pop(peer_address)
-                future.set_result(connection)
-
             # Emit an event to notify listeners of the new connection
             self.emit('connection', connection)
         else:

bumble/gatt.py

@@ -29,8 +29,8 @@ import functools
 import logging
 import struct
 from typing import Optional, Sequence
-from colors import color
 
+from .colors import color
 from .core import UUID, get_dict_key_by_value
 from .att import Attribute
 

bumble/gatt_client.py

@@ -27,9 +27,9 @@ import asyncio
 import logging
 import struct
 
-from colors import color
 from pyee import EventEmitter
 
+from .colors import color
 from .hci import HCI_Constant
 from .att import (
     ATT_ATTRIBUTE_NOT_FOUND_ERROR,

bumble/gatt_server.py

@@ -29,8 +29,8 @@ from collections import defaultdict
 import struct
 from typing import List, Tuple, Optional
 from pyee import EventEmitter
-from colors import color
 
+from .colors import color
 from .core import UUID
 from .att import (
     ATT_ATTRIBUTE_NOT_FOUND_ERROR,
@@ -61,7 +61,6 @@ from .att import (
 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,
@@ -543,8 +542,6 @@ class Server(EventEmitter):
             if attribute.handle >= request.starting_handle
             and attribute.handle <= request.ending_handle
         ):
-            # TODO: check permissions
-
             this_uuid_size = len(attribute.type.to_pdu_bytes())
 
             if attributes:
@@ -638,6 +635,13 @@ class Server(EventEmitter):
         '''
 
         pdu_space_available = connection.att_mtu - 2
+
+        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,
+        )
+
         attributes = []
         for attribute in (
             attribute
@@ -647,10 +651,21 @@ class Server(EventEmitter):
             and attribute.handle <= request.ending_handle
             and pdu_space_available
         ):
-            # TODO: check permissions
+
+            try:
+                attribute_value = attribute.read_value(connection)
+            except ATT_Error as error:
+                # If the first attribute is unreadable, return an error
+                # Otherwise return attributes up to this point
+                if not attributes:
+                    response = ATT_Error_Response(
+                        request_opcode_in_error=request.op_code,
+                        attribute_handle_in_error=attribute.handle,
+                        error_code=error.error_code,
+                    )
+                break
 
             # Check the attribute value size
-            attribute_value = attribute.read_value(connection)
             max_attribute_size = min(connection.att_mtu - 4, 253)
             if len(attribute_value) > max_attribute_size:
                 # We need to truncate
@@ -676,11 +691,7 @@ class Server(EventEmitter):
                 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,
-            )
+            logging.warning(f"not found {request}")
 
         self.send_response(connection, response)
 
@@ -690,10 +701,17 @@ class Server(EventEmitter):
         '''
 
         if attribute := self.get_attribute(request.attribute_handle):
-            # 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])
+            try:
+                value = attribute.read_value(connection)
+            except ATT_Error as error:
+                response = ATT_Error_Response(
+                    request_opcode_in_error=request.op_code,
+                    attribute_handle_in_error=request.attribute_handle,
+                    error_code=error.error_code,
+                )
+            else:
+                value_size = min(connection.att_mtu - 1, len(value))
+                response = ATT_Read_Response(attribute_value=value[:value_size])
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
@@ -708,29 +726,36 @@ class Server(EventEmitter):
         '''
 
         if attribute := self.get_attribute(request.attribute_handle):
-            # TODO: check permissions
-            value = attribute.read_value(connection)
-            if request.value_offset > len(value):
+            try:
+                value = attribute.read_value(connection)
+            except ATT_Error as error:
                 response = ATT_Error_Response(
                     request_opcode_in_error=request.op_code,
                     attribute_handle_in_error=request.attribute_handle,
-                    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=error.error_code,
                 )
             else:
-                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
-                    ]
-                )
+                if request.value_offset > len(value):
+                    response = ATT_Error_Response(
+                        request_opcode_in_error=request.op_code,
+                        attribute_handle_in_error=request.attribute_handle,
+                        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,
+                    )
+                else:
+                    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
+                        ]
+                    )
         else:
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
@@ -746,7 +771,6 @@ class Server(EventEmitter):
         if request.attribute_group_type not in (
             GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
             GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
-            GATT_INCLUDE_ATTRIBUTE_TYPE,
         ):
             response = ATT_Error_Response(
                 request_opcode_in_error=request.op_code,
@@ -766,8 +790,10 @@ class Server(EventEmitter):
             and attribute.handle <= request.ending_handle
             and pdu_space_available
         ):
-            # Check the attribute value size
+            # No need to catch permission errors here, since these attributes
+            # must all be world-readable
             attribute_value = attribute.read_value(connection)
+            # Check the attribute value size
             max_attribute_size = min(connection.att_mtu - 6, 251)
             if len(attribute_value) > max_attribute_size:
                 # We need to truncate

bumble/hci.py

@@ -20,9 +20,9 @@ import struct
 import collections
 import logging
 import functools
-from colors import color
 from typing import Dict, Type, Union
 
+from .colors import color
 from .core import (
     BT_BR_EDR_TRANSPORT,
     AdvertisingData,
@@ -1421,7 +1421,11 @@ class HCI_Constant:
 # -----------------------------------------------------------------------------
 class HCI_Error(ProtocolError):
     def __init__(self, error_code):
-        super().__init__(error_code, 'hci', HCI_Constant.error_name(error_code))
+        super().__init__(
+            error_code,
+            error_namespace='hci',
+            error_name=HCI_Constant.error_name(error_code),
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -1846,6 +1850,8 @@ class HCI_Packet:
     Abstract Base class for HCI packets
     '''
 
+    hci_packet_type: int
+
     @staticmethod
     def from_bytes(packet):
         packet_type = packet[0]
@@ -1864,6 +1870,9 @@ class HCI_Packet:
     def __init__(self, name):
         self.name = name
 
+    def __bytes__(self) -> bytes:
+        raise NotImplementedError
+
     def __repr__(self) -> str:
         return self.name
 
@@ -1875,6 +1884,9 @@ class HCI_CustomPacket(HCI_Packet):
         self.hci_packet_type = payload[0]
         self.payload = payload
 
+    def __bytes__(self) -> bytes:
+        return self.payload
+
 
 # -----------------------------------------------------------------------------
 class HCI_Command(HCI_Packet):

bumble/helpers.py

@@ -16,8 +16,8 @@
 # Imports
 # -----------------------------------------------------------------------------
 import logging
-from colors import color
 
+from .colors import color
 from .att import ATT_CID, ATT_PDU
 from .smp import SMP_CID, SMP_Command
 from .core import name_or_number

bumble/hfp.py

@@ -18,7 +18,8 @@
 import logging
 import asyncio
 import collections
-from colors import color
+
+from .colors import color
 
 
 # -----------------------------------------------------------------------------

bumble/host.py

@@ -20,9 +20,9 @@ import collections
 import logging
 import struct
 
-from colors import color
-
+from bumble.colors import color
 from bumble.l2cap import L2CAP_PDU
+from bumble.snoop import Snooper
 
 from .hci import (
     HCI_ACL_DATA_PACKET,
@@ -134,6 +134,7 @@ class Host(AbortableEventEmitter):
         self.long_term_key_provider = None
         self.link_key_provider = None
         self.pairing_io_capability_provider = None  # Classic only
+        self.snooper = None
 
         # Connect to the source and sink if specified
         if controller_source:
@@ -274,6 +275,9 @@ class Host(AbortableEventEmitter):
         self.hci_sink = sink
 
     def send_hci_packet(self, packet):
+        if self.snooper:
+            self.snooper.snoop(bytes(packet), Snooper.Direction.HOST_TO_CONTROLLER)
+
         self.hci_sink.on_packet(packet.to_bytes())
 
     async def send_command(self, command, check_result=False):
@@ -420,6 +424,9 @@ class Host(AbortableEventEmitter):
     def on_hci_packet(self, packet):
         logger.debug(f'{color("### CONTROLLER -> HOST", "green")}: {packet}')
 
+        if self.snooper:
+            self.snooper.snoop(bytes(packet), Snooper.Direction.CONTROLLER_TO_HOST)
+
         # If the packet is a command, invoke the handler for this packet
         if packet.hci_packet_type == HCI_COMMAND_PACKET:
             self.on_hci_command_packet(packet)

bumble/keys.py

@@ -25,8 +25,8 @@ import logging
 import os
 import json
 from typing import Optional
-from colors import color
 
+from .colors import color
 from .hci import Address
 
 

bumble/l2cap.py

@@ -21,10 +21,10 @@ import logging
 import struct
 
 from collections import deque
-from colors import color
 from pyee import EventEmitter
 from typing import Dict, Type
 
+from .colors import color
 from .core import BT_CENTRAL_ROLE, InvalidStateError, ProtocolError
 from .hci import (
     HCI_LE_Connection_Update_Command,

bumble/link.py

@@ -19,9 +19,7 @@ import logging
 import asyncio
 from functools import partial
 
-from colors import color
-import websockets
-
+from bumble.colors import color
 from bumble.hci import (
     Address,
     HCI_SUCCESS,
@@ -220,6 +218,8 @@ class RemoteLink:
                 )
 
     async def run_connection(self):
+        import websockets  # lazy import
+
         # Connect to the relay
         logger.debug(f'connecting to {self.uri}')
         # pylint: disable-next=no-member

bumble/rfcomm.py

@@ -18,10 +18,10 @@
 import logging
 import asyncio
 
-from colors import color
 from pyee import EventEmitter
 
 from . import core
+from .colors import color
 from .core import BT_BR_EDR_TRANSPORT, InvalidStateError, ProtocolError
 
 # -----------------------------------------------------------------------------

bumble/sdp.py

@@ -18,11 +18,10 @@
 from __future__ import annotations
 import logging
 import struct
-from colors import color
-import colors
 from typing import Dict, List, Type
 
 from . import core
+from .colors import color
 from .core import InvalidStateError
 from .hci import HCI_Object, name_or_number, key_with_value
 
@@ -506,7 +505,7 @@ class ServiceAttribute:
     def to_string(self, with_colors=False):
         if with_colors:
             return (
-                f'Attribute(id={colors.color(self.id_name(self.id),"magenta")},'
+                f'Attribute(id={color(self.id_name(self.id),"magenta")},'
                 f'value={self.value})'
             )
 

bumble/smp.py

@@ -29,8 +29,8 @@ import secrets
 from typing import Dict, Optional, Type
 
 from pyee import EventEmitter
-from colors import color
 
+from .colors import color
 from .hci import Address, HCI_LE_Enable_Encryption_Command, HCI_Object, key_with_value
 from .core import (
     BT_BR_EDR_TRANSPORT,
@@ -498,7 +498,7 @@ class PairingDelegate:
     DISPLAY_OUTPUT_ONLY = SMP_DISPLAY_ONLY_IO_CAPABILITY
     DISPLAY_OUTPUT_AND_YES_NO_INPUT = SMP_DISPLAY_YES_NO_IO_CAPABILITY
     DISPLAY_OUTPUT_AND_KEYBOARD_INPUT = SMP_KEYBOARD_DISPLAY_IO_CAPABILITY
-    DEFAULT_KEY_DISTRIBUTION = (
+    DEFAULT_KEY_DISTRIBUTION: int = (
         SMP_ENC_KEY_DISTRIBUTION_FLAG | SMP_ID_KEY_DISTRIBUTION_FLAG
     )
 
@@ -518,13 +518,15 @@ class PairingDelegate:
     async def confirm(self) -> bool:
         return True
 
-    async def compare_numbers(self, _number: int, _digits: int = 6) -> bool:
+    # pylint: disable-next=unused-argument
+    async def compare_numbers(self, number: int, digits: int) -> bool:
         return True
 
     async def get_number(self) -> int:
         return 0
 
-    async def display_number(self, _number: int, _digits: int = 6) -> None:
+    # pylint: disable-next=unused-argument
+    async def display_number(self, number: int, digits: int) -> None:
         pass
 
     async def key_distribution_response(
@@ -661,7 +663,8 @@ class Session:
         self.peer_expected_distributions = []
         self.dh_key = None
         self.confirm_value = None
-        self.passkey = 0
+        self.passkey = None
+        self.passkey_ready = asyncio.Event()
         self.passkey_step = 0
         self.passkey_display = False
         self.pairing_method = 0
@@ -839,6 +842,7 @@ class Session:
         # Generate random Passkey/PIN code
         self.passkey = secrets.randbelow(1000000)
         logger.debug(f'Pairing PIN CODE: {self.passkey:06}')
+        self.passkey_ready.set()
 
         # The value of TK is computed from the PIN code
         if not self.sc:
@@ -859,6 +863,8 @@ class Session:
                 self.tk = passkey.to_bytes(16, byteorder='little')
                 logger.debug(f'TK from passkey = {self.tk.hex()}')
 
+            self.passkey_ready.set()
+
             if next_steps is not None:
                 next_steps()
 
@@ -910,17 +916,29 @@ class Session:
         logger.debug(f'generated random: {self.r.hex()}')
 
         if self.sc:
-            if self.pairing_method in (self.JUST_WORKS, self.NUMERIC_COMPARISON):
-                z = 0
-            elif self.pairing_method == self.PASSKEY:
-                z = 0x80 + ((self.passkey >> self.passkey_step) & 1)
-            else:
-                return
 
-            if self.is_initiator:
-                confirm_value = crypto.f4(self.pka, self.pkb, self.r, bytes([z]))
-            else:
-                confirm_value = crypto.f4(self.pkb, self.pka, self.r, bytes([z]))
+            async def next_steps():
+                if self.pairing_method in (self.JUST_WORKS, self.NUMERIC_COMPARISON):
+                    z = 0
+                elif self.pairing_method == self.PASSKEY:
+                    # We need a passkey
+                    await self.passkey_ready.wait()
+
+                    z = 0x80 + ((self.passkey >> self.passkey_step) & 1)
+                else:
+                    return
+
+                if self.is_initiator:
+                    confirm_value = crypto.f4(self.pka, self.pkb, self.r, bytes([z]))
+                else:
+                    confirm_value = crypto.f4(self.pkb, self.pka, self.r, bytes([z]))
+
+                self.send_command(
+                    SMP_Pairing_Confirm_Command(confirm_value=confirm_value)
+                )
+
+            # Perform the next steps asynchronously in case we need to wait for input
+            self.connection.abort_on('disconnection', next_steps())
         else:
             confirm_value = crypto.c1(
                 self.tk,
@@ -933,7 +951,7 @@ class Session:
                 self.ra,
             )
 
-        self.send_command(SMP_Pairing_Confirm_Command(confirm_value=confirm_value))
+            self.send_command(SMP_Pairing_Confirm_Command(confirm_value=confirm_value))
 
     def send_pairing_random_command(self):
         self.send_command(SMP_Pairing_Random_Command(random_value=self.r))
@@ -1364,8 +1382,8 @@ class Session:
 
         # Start phase 2
         if self.sc:
-            if self.pairing_method == self.PASSKEY and self.passkey_display:
-                self.display_passkey()
+            if self.pairing_method == self.PASSKEY:
+                self.display_or_input_passkey()
 
             self.send_public_key_command()
         else:
@@ -1426,18 +1444,22 @@ class Session:
         else:
             srand = self.r
             mrand = command.random_value
-        stk = crypto.s1(self.tk, srand, mrand)
-        logger.debug(f'STK = {stk.hex()}')
+        self.stk = crypto.s1(self.tk, srand, mrand)
+        logger.debug(f'STK = {self.stk.hex()}')
 
         # Generate LTK
         self.ltk = crypto.r()
 
         if self.is_initiator:
-            self.start_encryption(stk)
+            self.start_encryption(self.stk)
         else:
             self.send_pairing_random_command()
 
     def on_smp_pairing_random_command_secure_connections(self, command):
+        if self.pairing_method == self.PASSKEY and self.passkey is None:
+            logger.warning('no passkey entered, ignoring command')
+            return
+
         # pylint: disable=too-many-return-statements
         if self.is_initiator:
             if self.pairing_method in (self.JUST_WORKS, self.NUMERIC_COMPARISON):
@@ -1565,17 +1587,13 @@ class Session:
         logger.debug(f'DH key: {self.dh_key.hex()}')
 
         if self.is_initiator:
-            if self.pairing_method == self.PASSKEY:
-                if self.passkey_display:
-                    self.send_pairing_confirm_command()
-                else:
-                    self.input_passkey(self.send_pairing_confirm_command)
+            self.send_pairing_confirm_command()
         else:
-            # Send our public key back to the initiator
             if self.pairing_method == self.PASSKEY:
-                self.display_or_input_passkey(self.send_public_key_command)
-            else:
-                self.send_public_key_command()
+                self.display_or_input_passkey()
+
+            # Send our public key back to the initiator
+            self.send_public_key_command()
 
             if self.pairing_method in (self.JUST_WORKS, self.NUMERIC_COMPARISON):
                 # We can now send the confirmation value

bumble/snoop.py

@@ -0,0 +1,170 @@
+# 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.
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+from contextlib import contextmanager
+from enum import IntEnum
+import logging
+import struct
+import datetime
+from typing import BinaryIO, Generator
+import os
+
+from bumble.hci import HCI_COMMAND_PACKET, HCI_EVENT_PACKET
+
+
+# -----------------------------------------------------------------------------
+# Logging
+# -----------------------------------------------------------------------------
+logger = logging.getLogger(__name__)
+
+
+# -----------------------------------------------------------------------------
+# Classes
+# -----------------------------------------------------------------------------
+class Snooper:
+    """
+    Base class for snooper implementations.
+
+    A snooper is an object that will be provided with HCI packets as they are
+    exchanged between a host and a controller.
+    """
+
+    class Direction(IntEnum):
+        HOST_TO_CONTROLLER = 0
+        CONTROLLER_TO_HOST = 1
+
+    class DataLinkType(IntEnum):
+        H1 = 1001
+        H4 = 1002
+        HCI_BSCP = 1003
+        H5 = 1004
+
+    def snoop(self, hci_packet: bytes, direction: Direction) -> None:
+        """Snoop on an HCI packet."""
+
+
+# -----------------------------------------------------------------------------
+class BtSnooper(Snooper):
+    """
+    Snooper that saves HCI packets using the BTSnoop format, based on RFC 1761.
+    """
+
+    IDENTIFICATION_PATTERN = b'btsnoop\0'
+    TIMESTAMP_ANCHOR = datetime.datetime(2000, 1, 1)
+    TIMESTAMP_DELTA = 0x00E03AB44A676000
+    ONE_MS = datetime.timedelta(microseconds=1)
+
+    def __init__(self, output: BinaryIO):
+        self.output = output
+
+        # Write the header
+        self.output.write(
+            self.IDENTIFICATION_PATTERN + struct.pack('>LL', 1, self.DataLinkType.H4)
+        )
+
+    def snoop(self, hci_packet: bytes, direction: Snooper.Direction) -> None:
+        flags = int(direction)
+        packet_type = hci_packet[0]
+        if packet_type in (HCI_EVENT_PACKET, HCI_COMMAND_PACKET):
+            flags |= 0x10
+
+        # Compute the current timestamp
+        timestamp = (
+            int((datetime.datetime.utcnow() - self.TIMESTAMP_ANCHOR) / self.ONE_MS)
+            + self.TIMESTAMP_DELTA
+        )
+
+        # Emit the record
+        self.output.write(
+            struct.pack(
+                '>IIIIQ',
+                len(hci_packet),  # Original Length
+                len(hci_packet),  # Included Length
+                flags,  # Packet Flags
+                0,  # Cumulative Drops
+                timestamp,  # Timestamp
+            )
+            + hci_packet
+        )
+
+
+# -----------------------------------------------------------------------------
+_SNOOPER_INSTANCE_COUNT = 0
+
+
+@contextmanager
+def create_snooper(spec: str) -> Generator[Snooper, None, None]:
+    """
+    Create a snooper given a specification string.
+
+    The general syntax for the specification string is:
+      <snooper-type>:<type-specific-arguments>
+
+    Supported snooper types are:
+
+      btsnoop
+        The syntax for the type-specific arguments for this type is:
+        <io-type>:<io-type-specific-arguments>
+
+        Supported I/O types are:
+
+        file
+          The type-specific arguments for this I/O type is a string that is converted
+          to a file path using the python `str.format()` string formatting. The log
+          records will be written to that file if it can be opened/created.
+          The keyword args that may be referenced by the string pattern are:
+            now: the value of `datetime.now()`
+            utcnow: the value of `datetime.utcnow()`
+            pid: the current process ID.
+            instance: the instance ID in the current process.
+
+    Examples:
+      btsnoop:file:my_btsnoop.log
+      btsnoop:file:/tmp/bumble_{now:%Y-%m-%d-%H:%M:%S}_{pid}.log
+
+    """
+    if ':' not in spec:
+        raise ValueError('snooper type prefix missing')
+
+    snooper_type, snooper_args = spec.split(':', maxsplit=1)
+
+    if snooper_type == 'btsnoop':
+        if ':' not in snooper_args:
+            raise ValueError('I/O type for btsnoop snooper type missing')
+
+        io_type, io_name = snooper_args.split(':', maxsplit=1)
+        if io_type == 'file':
+            # Process the file name string pattern.
+            global _SNOOPER_INSTANCE_COUNT
+            file_path = io_name.format(
+                now=datetime.datetime.now(),
+                utcnow=datetime.datetime.utcnow(),
+                pid=os.getpid(),
+                instance=_SNOOPER_INSTANCE_COUNT,
+            )
+
+            # Open the file
+            logger.debug(f'Snoop file: {file_path}')
+            with open(file_path, 'wb') as snoop_file:
+                _SNOOPER_INSTANCE_COUNT += 1
+                yield BtSnooper(snoop_file)
+                _SNOOPER_INSTANCE_COUNT -= 1
+                return
+
+        raise ValueError(f'I/O type {io_type} not supported')
+
+    raise ValueError(f'snooper type {snooper_type} not found')

bumble/transport/__init__.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.
@@ -15,11 +15,13 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from contextlib import asynccontextmanager
 import logging
+import os
 
-from .common import Transport, AsyncPipeSink
-from ..link import RemoteLink
+from .common import Transport, AsyncPipeSink, SnoopingTransport
 from ..controller import Controller
+from ..snoop import create_snooper
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -27,14 +29,53 @@ from ..controller import Controller
 logger = logging.getLogger(__name__)
 
 
+# -----------------------------------------------------------------------------
+def _wrap_transport(transport: Transport) -> Transport:
+    """
+    Automatically wrap a Transport instance when a wrapping class can be inferred
+    from the environment.
+    If no wrapping class is applicable, the transport argument is returned as-is.
+    """
+
+    # If BUMBLE_SNOOPER is set, try to automatically create a snooper.
+    if snooper_spec := os.getenv('BUMBLE_SNOOPER'):
+        try:
+            return SnoopingTransport.create_with(
+                transport, create_snooper(snooper_spec)
+            )
+        except Exception as exc:
+            logger.warning(f'Exception while creating snooper: {exc}')
+
+    return transport
+
+
 # -----------------------------------------------------------------------------
 async def open_transport(name: str) -> Transport:
-    '''
+    """
     Open a transport by name.
     The name must be <type>:<parameters>
     Where <parameters> depend on the type (and may be empty for some types).
-    The supported types are: serial,udp,tcp,pty,usb
-    '''
+    The supported types are:
+      * serial
+      * udp
+      * tcp-client
+      * tcp-server
+      * ws-client
+      * ws-server
+      * pty
+      * file
+      * vhci
+      * hci-socket
+      * usb
+      * pyusb
+      * android-emulator
+    """
+
+    return _wrap_transport(await _open_transport(name))
+
+
+# -----------------------------------------------------------------------------
+async def _open_transport(name: str) -> Transport:
     # pylint: disable=import-outside-toplevel
     # pylint: disable=too-many-return-statements
 
@@ -108,8 +149,21 @@ async def open_transport(name: str) -> Transport:
 
 
 # -----------------------------------------------------------------------------
-async def open_transport_or_link(name):
+async def open_transport_or_link(name: str) -> Transport:
+    """
+    Open a transport or a link relay.
+
+    Args:
+      name:
+        Name of the transport or link relay to open.
+        When the name starts with "link-relay:", open a link relay (see RemoteLink
+        for details on what the arguments are).
+        For other namespaces, see `open_transport`.
+
+    """
     if name.startswith('link-relay:'):
+        from ..link import RemoteLink  # lazy import
+
         link = RemoteLink(name[11:])
         await link.wait_until_connected()
         controller = Controller('remote', link=link)
@@ -118,6 +172,6 @@ async def open_transport_or_link(name):
             async def close(self):
                 link.close()
 
-        return LinkTransport(controller, AsyncPipeSink(controller))
+        return _wrap_transport(LinkTransport(controller, AsyncPipeSink(controller)))
 
     return await open_transport(name)

bumble/transport/common.py

@@ -15,12 +15,16 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
+import contextlib
 import struct
 import asyncio
 import logging
-from colors import color
+from typing import ContextManager
 
 from .. import hci
+from ..colors import color
+from ..snoop import Snooper
 
 
 # -----------------------------------------------------------------------------
@@ -246,6 +250,20 @@ class StreamPacketSink:
 
 # -----------------------------------------------------------------------------
 class Transport:
+    """
+    Base class for all transports.
+
+    A Transport represents a source and a sink together.
+    An instance must be closed by calling close() when no longer used. Instances
+    implement the ContextManager protocol so that they may be used in a `async with`
+    statement.
+    An instance is iterable. The iterator yields, in order, its source and sink, so
+    that it may be used with a convenient call syntax like:
+
+    async with create_transport() as (source, sink):
+        ...
+    """
+
     def __init__(self, source, sink):
         self.source = source
         self.sink = sink
@@ -335,3 +353,60 @@ class PumpedTransport(Transport):
     async def close(self):
         await super().close()
         await self.close_function()
+
+
+# -----------------------------------------------------------------------------
+class SnoopingTransport(Transport):
+    """Transport wrapper that snoops on packets to/from a wrapped transport."""
+
+    @staticmethod
+    def create_with(
+        transport: Transport, snooper: ContextManager[Snooper]
+    ) -> SnoopingTransport:
+        """
+        Create an instance given a snooper that works as as context manager.
+
+        The returned instance will exit the snooper context when it is closed.
+        """
+        with contextlib.ExitStack() as exit_stack:
+            return SnoopingTransport(
+                transport, exit_stack.enter_context(snooper), exit_stack.pop_all().close
+            )
+        raise RuntimeError('unexpected code path')  # Satisfy the type checker
+
+    class Source:
+        def __init__(self, source, snooper):
+            self.source = source
+            self.snooper = snooper
+            self.sink = None
+
+        def set_packet_sink(self, sink):
+            self.sink = sink
+            self.source.set_packet_sink(self)
+
+        def on_packet(self, packet):
+            self.snooper.snoop(packet, Snooper.Direction.CONTROLLER_TO_HOST)
+            if self.sink:
+                self.sink.on_packet(packet)
+
+    class Sink:
+        def __init__(self, sink, snooper):
+            self.sink = sink
+            self.snooper = snooper
+
+        def on_packet(self, packet):
+            self.snooper.snoop(packet, Snooper.Direction.HOST_TO_CONTROLLER)
+            if self.sink:
+                self.sink.on_packet(packet)
+
+    def __init__(self, transport, snooper, close_snooper=None):
+        super().__init__(
+            self.Source(transport.source, snooper), self.Sink(transport.sink, snooper)
+        )
+        self.transport = transport
+        self.close_snooper = close_snooper
+
+    async def close(self):
+        await self.transport.close()
+        if self.close_snooper:
+            self.close_snooper()

bumble/transport/pyusb.py

@@ -22,10 +22,10 @@ import time
 
 import usb.core
 import usb.util
-from colors import color
 
 from .common import Transport, ParserSource
 from .. import hci
+from ..colors import color
 
 
 # -----------------------------------------------------------------------------

bumble/transport/usb.py

@@ -23,10 +23,10 @@ import ctypes
 import platform
 
 import usb1
-from colors import color
 
 from .common import Transport, ParserSource
 from .. import hci
+from ..colors import color
 
 
 # -----------------------------------------------------------------------------

bumble/utils.py

@@ -22,9 +22,9 @@ import collections
 import sys
 from typing import Awaitable, TypeVar
 from functools import wraps
-from colors import color
 from pyee import EventEmitter
 
+from .colors import color
 
 # -----------------------------------------------------------------------------
 # Logging

examples/battery_client.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 from bumble.device import Device
 from bumble.transport import open_transport
 from bumble.profiles.battery_service import BatteryServiceProxy

examples/device_information_client.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 from bumble.device import Device, Peer
 from bumble.profiles.device_information_service import DeviceInformationServiceProxy
 from bumble.transport import open_transport

examples/heart_rate_client.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 from bumble.device import Device
 from bumble.transport import open_transport
 from bumble.profiles.heart_rate_service import HeartRateServiceProxy

examples/keyboard.py

@@ -22,7 +22,7 @@ import logging
 import struct
 import json
 import websockets
-from colors import color
+from bumble.colors import color
 
 from bumble.core import AdvertisingData
 from bumble.device import Device, Connection, Peer

examples/run_a2dp_info.py

@@ -20,7 +20,7 @@ import sys
 import os
 import logging
 
-from colors import color
+from bumble.colors import color
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
 from bumble.core import (

examples/run_a2dp_source.py

@@ -20,7 +20,7 @@ import sys
 import os
 import logging
 
-from colors import color
+from bumble.colors import color
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
 from bumble.core import BT_BR_EDR_TRANSPORT

examples/run_classic_connect.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 
 from bumble.device import Device
 from bumble.transport import open_transport_or_link

examples/run_classic_discovery.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 
 from bumble.device import Device
 from bumble.transport import open_transport_or_link

examples/run_controller_with_scanner.py

@@ -19,7 +19,7 @@ import logging
 import asyncio
 import sys
 import os
-from colors import color
+from bumble.colors import color
 
 from bumble.device import Device
 from bumble.controller import Controller

examples/run_device_with_snooper.py

@@ -0,0 +1,51 @@
+# 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.
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+import asyncio
+import sys
+import os
+import logging
+from bumble.colors import color
+
+from bumble.device import Device
+from bumble.transport import open_transport_or_link
+from bumble.snoop import BtSnooper
+
+# -----------------------------------------------------------------------------
+async def main():
+    if len(sys.argv) != 3:
+        print('Usage: run_device_with_snooper.py <transport-spec> <snoop-file>')
+        print('example: run_device_with_snooper.py usb:0 btsnoop.log')
+        return
+
+    print('<<< connecting to HCI...')
+    async with await open_transport_or_link(sys.argv[1]) as (hci_source, hci_sink):
+        print('<<< connected')
+
+        device = Device.with_hci('Bumble', 'F0:F1:F2:F3:F4:F5', hci_source, hci_sink)
+
+        with open(sys.argv[2], "wb") as snoop_file:
+            device.host.snooper = BtSnooper(snoop_file)
+            await device.power_on()
+            await device.start_scanning()
+
+            await hci_source.wait_for_termination()
+
+
+# -----------------------------------------------------------------------------
+logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
+asyncio.run(main())

examples/run_gatt_client.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 
 from bumble.core import ProtocolError
 from bumble.device import Device, Peer

examples/run_gatt_client_and_server.py

@@ -18,7 +18,7 @@
 import asyncio
 import os
 import logging
-from colors import color
+from bumble.colors import color
 
 from bumble.core import ProtocolError
 from bumble.controller import Controller

examples/run_hfp_gateway.py

@@ -20,7 +20,7 @@ import sys
 import os
 import logging
 
-from colors import color
+from bumble.colors import color
 
 import bumble.core
 from bumble.device import Device

examples/run_rfcomm_client.py

@@ -20,7 +20,7 @@ import sys
 import os
 import logging
 
-from colors import color
+from bumble.colors import color
 
 import bumble.core
 from bumble.device import Device

examples/run_scanner.py

@@ -19,7 +19,7 @@ import asyncio
 import sys
 import os
 import logging
-from colors import color
+from bumble.colors import color
 
 from bumble.device import Device
 from bumble.transport import open_transport_or_link

setup.cfg

@@ -30,11 +30,8 @@ package_dir =
     bumble.apps = apps
 include-package-data = True
 install_requires =
-    aioconsole >= 0.4.1
-    ansicolors >= 1.1
     appdirs >= 1.4
     click >= 7.1.2; platform_system!='Emscripten'
-    construct >= 2.10
     cryptography == 35; platform_system!='Emscripten'
     grpcio >= 1.46; platform_system!='Emscripten'
     libusb1 >= 2.0.1; platform_system!='Emscripten'
@@ -75,7 +72,7 @@ test =
 development =
     black == 22.10
     invoke >= 1.7.3
-    mypy == 0.991
+    mypy == 1.1.1
     nox >= 2022
     pylint == 2.15.8
     types-appdirs >= 1.4.3

tests/device_test.py

@@ -197,7 +197,7 @@ async def test_device_connect_parallel():
     d1.host.set_packet_sink(Sink(d1_flow()))
     d2.host.set_packet_sink(Sink(d2_flow()))
 
-    [c01, c02, a10, a20, a01] = await asyncio.gather(
+    [c01, c02, a10, a20] = await asyncio.gather(
         *[
             asyncio.create_task(
                 d0.connect(d1.public_address, transport=BT_BR_EDR_TRANSPORT)
@@ -207,7 +207,6 @@ async def test_device_connect_parallel():
             ),
             asyncio.create_task(d1.accept(peer_address=d0.public_address)),
             asyncio.create_task(d2.accept()),
-            asyncio.create_task(d0.accept(peer_address=d1.public_address)),
         ]
     )
 
@@ -215,11 +214,9 @@ async def test_device_connect_parallel():
     assert type(c02) == Connection
     assert type(a10) == Connection
     assert type(a20) == Connection
-    assert type(a01) == Connection
 
     assert c01.handle == a10.handle and c01.handle == 0x100
     assert c02.handle == a20.handle and c02.handle == 0x101
-    assert a01 == c01
 
 
 # -----------------------------------------------------------------------------

tests/self_test.py

@@ -32,7 +32,6 @@ from bumble.smp import (
     PairingDelegate,
     SMP_PAIRING_NOT_SUPPORTED_ERROR,
     SMP_CONFIRM_VALUE_FAILED_ERROR,
-    SMP_ID_KEY_DISTRIBUTION_FLAG,
 )
 from bumble.core import ProtocolError
 
@@ -273,9 +272,15 @@ KEY_DIST = range(16)
 
 @pytest.mark.asyncio
 @pytest.mark.parametrize(
-    'io_cap, sc, mitm, key_dist', itertools.product(IO_CAP, SC, MITM, KEY_DIST)
+    'io_caps, sc, mitm, key_dist',
+    itertools.chain(
+        itertools.product([IO_CAP], SC, MITM, [15]),
+        itertools.product(
+            [[PairingDelegate.DISPLAY_OUTPUT_AND_KEYBOARD_INPUT]], SC, MITM, KEY_DIST
+        ),
+    ),
 )
-async def test_self_smp(io_cap, sc, mitm, key_dist):
+async def test_self_smp(io_caps, sc, mitm, key_dist):
     class Delegate(PairingDelegate):
         def __init__(
             self,
@@ -296,6 +301,7 @@ async def test_self_smp(io_cap, sc, mitm, key_dist):
             self.peer_delegate = None
             self.number = asyncio.get_running_loop().create_future()
 
+        # pylint: disable-next=unused-argument
         async def compare_numbers(self, number, digits):
             if self.peer_delegate is None:
                 logger.warning(f'[{self.name}] no peer delegate')
@@ -331,8 +337,9 @@ async def test_self_smp(io_cap, sc, mitm, key_dist):
 
     pairing_config_sets = [('Initiator', [None]), ('Responder', [None])]
     for pairing_config_set in pairing_config_sets:
-        delegate = Delegate(pairing_config_set[0], io_cap, key_dist, key_dist)
-        pairing_config_set[1].append(PairingConfig(sc, mitm, True, delegate))
+        for io_cap in io_caps:
+            delegate = Delegate(pairing_config_set[0], io_cap, key_dist, key_dist)
+            pairing_config_set[1].append(PairingConfig(sc, mitm, True, delegate))
 
     for pairing_config1 in pairing_config_sets[0][1]:
         for pairing_config2 in pairing_config_sets[1][1]:

tests/transport_test.py

@@ -72,5 +72,6 @@ def test_parser_extensions():
 
 
 # -----------------------------------------------------------------------------
-test_parser()
-test_parser_extensions()
+if __name__ == '__main__':
+    test_parser()
+    test_parser_extensions()