cryptography: bump version to 44.0.3 to fix python parsing

Bug: 404336381

.github/ci-gradle.properties

@@ -0,0 +1,26 @@
+#
+# Copyright 2025 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
+#
+#     http://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.
+#
+
+org.gradle.configureondemand=true
+org.gradle.caching=true
+org.gradle.parallel=true
+
+# Declare we support AndroidX
+android.useAndroidX=true
+
+org.gradle.jvmargs=-Xmx4608m -XX:MaxMetaspaceSize=1536m -XX:+HeapDumpOnOutOfMemoryError
+
+kotlin.compiler.execution.strategy=in-process

.github/workflows/gradle-btbench.yml

@@ -0,0 +1,33 @@
+name: Gradle Android Build & test
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+    paths:
+      - 'extras/android/BtBench/**'
+
+permissions:
+  contents: read
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    timeout-minutes: 40
+
+    steps:
+      - name: Check out from Git
+        uses: actions/checkout@v3
+
+      - name: Set up JDK
+        uses: actions/setup-java@v4
+        with:
+          distribution: 'zulu'
+          java-version: 17
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@v3
+
+      - name: Build with Gradle
+        run: cd extras/android/BtBench && ./gradlew build

.github/workflows/python-avatar.yml

@@ -44,7 +44,7 @@ jobs:
         run: cat rootcanal.log
       - name: Upload Mobly logs
         if: always()
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
-          name: mobly-logs
+          name: mobly-logs-${{ strategy.job-index }}
           path: /tmp/logs/mobly/bumble.bumbles/

apps/auracast.py

@@ -18,7 +18,6 @@
 from __future__ import annotations
 
 import asyncio
-import asyncio.subprocess
 import collections
 import contextlib
 import dataclasses
@@ -27,7 +26,6 @@ import logging
 import os
 import struct
 from typing import (
-    cast,
     Any,
     AsyncGenerator,
     Coroutine,
@@ -37,7 +35,6 @@ from typing import (
 )
 
 import click
-import pyee
 
 try:
     import lc3  # type: ignore  # pylint: disable=E0401
@@ -100,12 +97,31 @@ def codec_config_string(
     return '\n'.join(indent + line for line in lines)
 
 
+def broadcast_code_bytes(broadcast_code: str) -> bytes:
+    """
+    Convert a broadcast code string to a 16-byte value.
+
+    If `broadcast_code` is `0x` followed by 32 hex characters, it is interpreted as a
+    raw 16-byte raw broadcast code in big-endian byte order.
+    Otherwise, `broadcast_code` is converted to a 16-byte value as specified in
+    BLUETOOTH CORE SPECIFICATION Version 6.0 | Vol 3, Part C , section 3.2.6.3
+    """
+    if broadcast_code.startswith("0x") and len(broadcast_code) == 34:
+        return bytes.fromhex(broadcast_code[2:])[::-1]
+
+    broadcast_code_utf8 = broadcast_code.encode("utf-8")
+    if len(broadcast_code_utf8) > 16:
+        raise ValueError("broadcast code must be <= 16 bytes in utf-8 encoding")
+    padding = bytes(16 - len(broadcast_code_utf8))
+    return broadcast_code_utf8 + padding
+
+
 # -----------------------------------------------------------------------------
 # Scan For Broadcasts
 # -----------------------------------------------------------------------------
-class BroadcastScanner(pyee.EventEmitter):
+class BroadcastScanner(bumble.utils.EventEmitter):
     @dataclasses.dataclass
-    class Broadcast(pyee.EventEmitter):
+    class Broadcast(bumble.utils.EventEmitter):
         name: str | None
         sync: bumble.device.PeriodicAdvertisingSync
         broadcast_id: int
@@ -127,11 +143,9 @@ class BroadcastScanner(pyee.EventEmitter):
         def update(self, advertisement: bumble.device.Advertisement) -> None:
             self.rssi = advertisement.rssi
             for service_data in advertisement.data.get_all(
-                core.AdvertisingData.SERVICE_DATA
+                core.AdvertisingData.Type.SERVICE_DATA_16_BIT_UUID
             ):
-                assert isinstance(service_data, tuple)
                 service_uuid, data = service_data
-                assert isinstance(data, bytes)
 
                 if service_uuid == gatt.GATT_PUBLIC_BROADCAST_ANNOUNCEMENT_SERVICE:
                     self.public_broadcast_announcement = (
@@ -145,16 +159,14 @@ class BroadcastScanner(pyee.EventEmitter):
                     )
                     continue
 
-            self.appearance = advertisement.data.get(  # type: ignore[assignment]
+            self.appearance = advertisement.data.get(
-                core.AdvertisingData.APPEARANCE
+                core.AdvertisingData.Type.APPEARANCE
             )
 
             if manufacturer_data := advertisement.data.get(
-                core.AdvertisingData.MANUFACTURER_SPECIFIC_DATA
+                core.AdvertisingData.Type.MANUFACTURER_SPECIFIC_DATA
             ):
-                assert isinstance(manufacturer_data, tuple)
+                company_id, data = manufacturer_data
-                company_id = cast(int, manufacturer_data[0])
-                data = cast(bytes, manufacturer_data[1])
                 self.manufacturer_data = (
                     company_ids.COMPANY_IDENTIFIERS.get(
                         company_id, f'0x{company_id:04X}'
@@ -239,22 +251,14 @@ class BroadcastScanner(pyee.EventEmitter):
 
             if self.biginfo:
                 print(color('  BIG:', 'cyan'))
-                print(
+                print(color('    Number of BIS:', 'magenta'), self.biginfo.num_bis)
-                    color('    Number of BIS:', 'magenta'),
+                print(color('    ISO Interval: ', 'magenta'), self.biginfo.iso_interval)
-                    self.biginfo.num_bis,
+                print(color('    Max PDU:      ', 'magenta'), self.biginfo.max_pdu)
-                )
+                print(color('    SDU Interval: ', 'magenta'), self.biginfo.sdu_interval)
-                print(
+                print(color('    Max SDU:      ', 'magenta'), self.biginfo.max_sdu)
-                    color('    PHY:          ', 'magenta'),
+                print(color('    PHY:          ', 'magenta'), self.biginfo.phy.name)
-                    self.biginfo.phy.name,
+                print(color('    Framed:       ', 'magenta'), self.biginfo.framed)
-                )
+                print(color('    Encrypted:    ', 'magenta'), self.biginfo.encrypted)
-                print(
-                    color('    Framed:       ', 'magenta'),
-                    self.biginfo.framed,
-                )
-                print(
-                    color('    Encrypted:    ', 'magenta'),
-                    self.biginfo.encrypted,
-                )
 
         def on_sync_establishment(self) -> None:
             self.emit('sync_establishment')
@@ -271,11 +275,9 @@ class BroadcastScanner(pyee.EventEmitter):
                 return
 
             for service_data in advertisement.data.get_all(
-                core.AdvertisingData.SERVICE_DATA
+                core.AdvertisingData.Type.SERVICE_DATA_16_BIT_UUID
             ):
-                assert isinstance(service_data, tuple)
                 service_uuid, data = service_data
-                assert isinstance(data, bytes)
 
                 if service_uuid == gatt.GATT_BASIC_AUDIO_ANNOUNCEMENT_SERVICE:
                     self.basic_audio_announcement = (
@@ -316,24 +318,23 @@ class BroadcastScanner(pyee.EventEmitter):
     def on_advertisement(self, advertisement: bumble.device.Advertisement) -> None:
         if not (
             ads := advertisement.data.get_all(
-                core.AdvertisingData.SERVICE_DATA_16_BIT_UUID
+                core.AdvertisingData.Type.SERVICE_DATA_16_BIT_UUID
             )
         ) or not (
             broadcast_audio_announcement := next(
                 (
                     ad
                     for ad in ads
-                    if isinstance(ad, tuple)
+                    if ad[0] == gatt.GATT_BROADCAST_AUDIO_ANNOUNCEMENT_SERVICE
-                    and ad[0] == gatt.GATT_BROADCAST_AUDIO_ANNOUNCEMENT_SERVICE
                 ),
                 None,
             )
         ):
             return
 
-        broadcast_name = advertisement.data.get(core.AdvertisingData.BROADCAST_NAME)
+        broadcast_name = advertisement.data.get_all(
-        assert isinstance(broadcast_name, str) or broadcast_name is None
+            core.AdvertisingData.Type.BROADCAST_NAME
-        assert isinstance(broadcast_audio_announcement[1], bytes)
+        )
 
         if broadcast := self.broadcasts.get(advertisement.address):
             broadcast.update(advertisement)
@@ -341,7 +342,7 @@ class BroadcastScanner(pyee.EventEmitter):
 
         bumble.utils.AsyncRunner.spawn(
             self.on_new_broadcast(
-                broadcast_name,
+                broadcast_name[0] if broadcast_name else None,
                 advertisement,
                 bap.BroadcastAudioAnnouncement.from_bytes(
                     broadcast_audio_announcement[1]
@@ -373,7 +374,7 @@ class BroadcastScanner(pyee.EventEmitter):
         self.emit('broadcast_loss', broadcast)
 
 
-class PrintingBroadcastScanner(pyee.EventEmitter):
+class PrintingBroadcastScanner(bumble.utils.EventEmitter):
     def __init__(
         self, device: bumble.device.Device, filter_duplicates: bool, sync_timeout: float
     ) -> None:
@@ -522,14 +523,19 @@ async def run_assist(
             return
 
         # Subscribe to and read the broadcast receive state characteristics
+        def on_broadcast_receive_state_update(
+            value: bass.BroadcastReceiveState, index: int
+        ) -> None:
+            print(
+                f"{color(f'Broadcast Receive State Update [{index}]:', 'green')} {value}"
+            )
+
         for i, broadcast_receive_state in enumerate(
             bass_client.broadcast_receive_states
         ):
             try:
                 await broadcast_receive_state.subscribe(
-                    lambda value, i=i: print(
+                    functools.partial(on_broadcast_receive_state_update, index=i)
-                        f"{color(f'Broadcast Receive State Update [{i}]:', 'green')} {value}"
-                    )
                 )
             except core.ProtocolError as error:
                 print(
@@ -705,14 +711,13 @@ async def run_receive(
 
         def on_change() -> None:
             if (
-                broadcast.basic_audio_announcement
+                broadcast.basic_audio_announcement and broadcast.biginfo
-                and not basic_audio_announcement_scanned.is_set()
+            ) and not basic_audio_announcement_scanned.is_set():
-            ):
                 basic_audio_announcement_scanned.set()
 
         broadcast.on('change', on_change)
-        if not broadcast.basic_audio_announcement:
+        if not broadcast.basic_audio_announcement or not broadcast.biginfo:
-            print('Wait for Basic Audio Announcement...')
+            print('Wait for Basic Audio Announcement and BIG Info...')
             await basic_audio_announcement_scanned.wait()
         print('Basic Audio Announcement found')
         broadcast.print()
@@ -733,7 +738,7 @@ async def run_receive(
                 big_sync_timeout=0x4000,
                 bis=[bis.index for bis in subgroup.bis],
                 broadcast_code=(
-                    bytes.fromhex(broadcast_code) if broadcast_code else None
+                    broadcast_code_bytes(broadcast_code) if broadcast_code else None
                 ),
             ),
         )
@@ -790,16 +795,8 @@ async def run_receive(
             for i, bis_link in enumerate(big_sync.bis_links):
                 print(f'Setup ISO for BIS {bis_link.handle}')
                 bis_link.sink = functools.partial(sink, lc3_queues[i])
-                await device.send_command(
+                await bis_link.setup_data_path(
-                    hci.HCI_LE_Setup_ISO_Data_Path_Command(
+                    direction=bis_link.Direction.CONTROLLER_TO_HOST
-                        connection_handle=bis_link.handle,
-                        data_path_direction=hci.HCI_LE_Setup_ISO_Data_Path_Command.Direction.CONTROLLER_TO_HOST,
-                        data_path_id=0,
-                        codec_id=hci.CodingFormat(codec_id=hci.CodecID.TRANSPARENT),
-                        controller_delay=0,
-                        codec_configuration=b'',
-                    ),
-                    check_result=True,
                 )
 
             terminated = asyncio.Event()
@@ -955,14 +952,19 @@ async def run_transmit(
                     max_transport_latency=65,
                     rtn=4,
                     broadcast_code=(
-                        bytes.fromhex(broadcast_code) if broadcast_code else None
+                        broadcast_code_bytes(broadcast_code) if broadcast_code else None
                     ),
                 ),
             )
+            for bis_link in big.bis_links:
+                print(f'Setup ISO for BIS {bis_link.handle}')
+                await bis_link.setup_data_path(
+                    direction=bis_link.Direction.HOST_TO_CONTROLLER
+                )
 
             iso_queues = [
-                bumble.device.IsoPacketStream(big.bis_links[0], 64),
+                bumble.device.IsoPacketStream(bis_link, 64)
-                bumble.device.IsoPacketStream(big.bis_links[1], 64),
+                for bis_link in big.bis_links
             ]
 
             def on_flow():
@@ -1094,7 +1096,7 @@ def pair(ctx, transport, address):
     '--broadcast-code',
     metavar='BROADCAST_CODE',
     type=str,
-    help='Broadcast encryption code in hex format',
+    help='Broadcast encryption code (string or raw hex format prefixed with 0x)',
 )
 @click.option(
     '--sync-timeout',

apps/bench.py

@@ -16,6 +16,7 @@
 # Imports
 # -----------------------------------------------------------------------------
 import asyncio
+import dataclasses
 import enum
 import logging
 import os
@@ -27,8 +28,7 @@ import click
 
 from bumble import l2cap
 from bumble.core import (
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
-    BT_LE_TRANSPORT,
     BT_L2CAP_PROTOCOL_ID,
     BT_RFCOMM_PROTOCOL_ID,
     UUID,
@@ -41,8 +41,7 @@ from bumble.hci import (
     HCI_LE_1M_PHY,
     HCI_LE_2M_PHY,
     HCI_LE_CODED_PHY,
-    HCI_CENTRAL_ROLE,
+    Role,
-    HCI_PERIPHERAL_ROLE,
     HCI_Constant,
     HCI_Error,
     HCI_StatusError,
@@ -97,49 +96,22 @@ DEFAULT_RFCOMM_MTU = 2048
 # -----------------------------------------------------------------------------
 # Utils
 # -----------------------------------------------------------------------------
-def parse_packet(packet):
-    if len(packet) < 1:
-        logging.info(
-            color(f'!!! Packet too short (got {len(packet)} bytes, need >= 1)', 'red')
-        )
-        raise ValueError('packet too short')
-
-    try:
-        packet_type = PacketType(packet[0])
-    except ValueError:
-        logging.info(color(f'!!! Invalid packet type 0x{packet[0]:02X}', 'red'))
-        raise
-
-    return (packet_type, packet[1:])
-
-
-def parse_packet_sequence(packet_data):
-    if len(packet_data) < 5:
-        logging.info(
-            color(
-                f'!!!Packet too short (got {len(packet_data)} bytes, need >= 5)',
-                'red',
-            )
-        )
-        raise ValueError('packet too short')
-    return struct.unpack_from('>bI', packet_data, 0)
-
-
 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)
     )
 
 
+def print_connection_phy(phy):
+    logging.info(
+        color('@@@ PHY: ', 'yellow') + f'TX:{le_phy_name(phy.tx_phy)}/'
+        f'RX:{le_phy_name(phy.rx_phy)}'
+    )
+
+
 def print_connection(connection):
     params = []
-    if connection.transport == BT_LE_TRANSPORT:
+    if connection.transport == PhysicalTransport.LE:
-        params.append(
-            'PHY='
-            f'TX:{le_phy_name(connection.phy.tx_phy)}/'
-            f'RX:{le_phy_name(connection.phy.rx_phy)}'
-        )
-
         params.append(
             'DL=('
             f'TX:{connection.data_length[0]}/{connection.data_length[1]},'
@@ -149,9 +121,9 @@ def print_connection(connection):
 
         params.append(
             'Parameters='
-            f'{connection.parameters.connection_interval * 1.25:.2f}/'
+            f'{connection.parameters.connection_interval:.2f}/'
             f'{connection.parameters.peripheral_latency}/'
-            f'{connection.parameters.supervision_timeout * 10} '
+            f'{connection.parameters.supervision_timeout:.2f} '
         )
 
         params.append(f'MTU={connection.att_mtu}')
@@ -215,7 +187,7 @@ def log_stats(title, stats, precision=2):
 
 
 async def switch_roles(connection, role):
-    target_role = HCI_CENTRAL_ROLE if role == "central" else HCI_PERIPHERAL_ROLE
+    target_role = Role.CENTRAL if role == "central" else Role.PERIPHERAL
     if connection.role != target_role:
         logging.info(f'{color("### Switching roles to:", "cyan")} {role}')
         try:
@@ -225,13 +197,135 @@ async def switch_roles(connection, role):
             logging.info(f'{color("### Role switch failed:", "red")} {error}')
 
 
-class PacketType(enum.IntEnum):
+# -----------------------------------------------------------------------------
-    RESET = 0
+# Packet
-    SEQUENCE = 1
+# -----------------------------------------------------------------------------
-    ACK = 2
+@dataclasses.dataclass
+class Packet:
+    class PacketType(enum.IntEnum):
+        RESET = 0
+        SEQUENCE = 1
+        ACK = 2
+
+    class PacketFlags(enum.IntFlag):
+        LAST = 1
+
+    packet_type: PacketType
+    flags: PacketFlags = PacketFlags(0)
+    sequence: int = 0
+    timestamp: int = 0
+    payload: bytes = b""
+
+    @classmethod
+    def from_bytes(cls, data: bytes):
+        if len(data) < 1:
+            logging.warning(
+                color(f'!!! Packet too short (got {len(data)} bytes, need >= 1)', 'red')
+            )
+            raise ValueError('packet too short')
+
+        try:
+            packet_type = cls.PacketType(data[0])
+        except ValueError:
+            logging.warning(color(f'!!! Invalid packet type 0x{data[0]:02X}', 'red'))
+            raise
+
+        if packet_type == cls.PacketType.RESET:
+            return cls(packet_type)
+
+        flags = cls.PacketFlags(data[1])
+        (sequence,) = struct.unpack_from("<I", data, 2)
+
+        if packet_type == cls.PacketType.ACK:
+            if len(data) < 6:
+                logging.warning(
+                    color(
+                        f'!!! Packet too short (got {len(data)} bytes, need >= 6)',
+                        'red',
+                    )
+                )
+            return cls(packet_type, flags, sequence)
+
+        if len(data) < 10:
+            logging.warning(
+                color(
+                    f'!!! Packet too short (got {len(data)} bytes, need >= 10)', 'red'
+                )
+            )
+            raise ValueError('packet too short')
+
+        (timestamp,) = struct.unpack_from("<I", data, 6)
+        return cls(packet_type, flags, sequence, timestamp, data[10:])
+
+    def __bytes__(self):
+        if self.packet_type == self.PacketType.RESET:
+            return bytes([self.packet_type])
+
+        if self.packet_type == self.PacketType.ACK:
+            return struct.pack("<BBI", self.packet_type, self.flags, self.sequence)
+
+        return (
+            struct.pack(
+                "<BBII", self.packet_type, self.flags, self.sequence, self.timestamp
+            )
+            + self.payload
+        )
 
 
-PACKET_FLAG_LAST = 1
+# -----------------------------------------------------------------------------
+# Jitter Stats
+# -----------------------------------------------------------------------------
+class JitterStats:
+    def __init__(self):
+        self.reset()
+
+    def reset(self):
+        self.packets = []
+        self.receive_times = []
+        self.jitter = []
+
+    def on_packet_received(self, packet):
+        now = time.time()
+        self.packets.append(packet)
+        self.receive_times.append(now)
+
+        if packet.timestamp and len(self.packets) > 1:
+            expected_time = (
+                self.receive_times[0]
+                + (packet.timestamp - self.packets[0].timestamp) / 1000000
+            )
+            jitter = now - expected_time
+        else:
+            jitter = 0.0
+
+        self.jitter.append(jitter)
+        return jitter
+
+    def show_stats(self):
+        if len(self.jitter) < 3:
+            return
+        average = sum(self.jitter) / len(self.jitter)
+        adjusted = [jitter - average for jitter in self.jitter]
+
+        log_stats('Jitter (signed)', adjusted, 3)
+        log_stats('Jitter (absolute)', [abs(jitter) for jitter in adjusted], 3)
+
+        # Show a histogram
+        bin_count = 20
+        bins = [0] * bin_count
+        interval_min = min(adjusted)
+        interval_max = max(adjusted)
+        interval_range = interval_max - interval_min
+        bin_thresholds = [
+            interval_min + i * (interval_range / bin_count) for i in range(bin_count)
+        ]
+        for jitter in adjusted:
+            for i in reversed(range(bin_count)):
+                if jitter >= bin_thresholds[i]:
+                    bins[i] += 1
+                    break
+        for i in range(bin_count):
+            logging.info(f'@@@ >= {bin_thresholds[i]:.4f}: {bins[i]}')
 
 
 # -----------------------------------------------------------------------------
@@ -281,19 +375,37 @@ class Sender:
                 await asyncio.sleep(self.tx_start_delay)
 
             logging.info(color('=== Sending RESET', 'magenta'))
-            await self.packet_io.send_packet(bytes([PacketType.RESET]))
+            await self.packet_io.send_packet(
+                bytes(Packet(packet_type=Packet.PacketType.RESET))
+            )
+
             self.start_time = time.time()
             self.bytes_sent = 0
             for tx_i in range(self.tx_packet_count):
-                packet_flags = (
+                if self.pace > 0:
-                    PACKET_FLAG_LAST if tx_i == self.tx_packet_count - 1 else 0
+                    # Wait until it is time to send the next packet
+                    target_time = self.start_time + (tx_i * self.pace / 1000)
+                    now = time.time()
+                    if now < target_time:
+                        await asyncio.sleep(target_time - now)
+                else:
+                    await self.packet_io.drain()
+
+                packet = bytes(
+                    Packet(
+                        packet_type=Packet.PacketType.SEQUENCE,
+                        flags=(
+                            Packet.PacketFlags.LAST
+                            if tx_i == self.tx_packet_count - 1
+                            else 0
+                        ),
+                        sequence=tx_i,
+                        timestamp=int((time.time() - self.start_time) * 1000000),
+                        payload=bytes(
+                            self.tx_packet_size - 10 - self.packet_io.overhead_size
+                        ),
+                    )
                 )
-                packet = struct.pack(
-                    '>bbI',
-                    PacketType.SEQUENCE,
-                    packet_flags,
-                    tx_i,
-                ) + bytes(self.tx_packet_size - 6 - self.packet_io.overhead_size)
                 logging.info(
                     color(
                         f'Sending packet {tx_i}: {self.tx_packet_size} bytes', 'yellow'
@@ -302,14 +414,6 @@ class Sender:
                 self.bytes_sent += len(packet)
                 await self.packet_io.send_packet(packet)
 
-                if self.pace is None:
-                    continue
-
-                if self.pace > 0:
-                    await asyncio.sleep(self.pace / 1000)
-                else:
-                    await self.packet_io.drain()
-
             await self.done.wait()
 
             run_counter = f'[{run + 1} of {self.repeat + 1}]' if self.repeat else ''
@@ -321,13 +425,13 @@ class Sender:
         if self.repeat:
             logging.info(color('--- End of runs', 'blue'))
 
-    def on_packet_received(self, packet):
+    def on_packet_received(self, data):
         try:
-            packet_type, _ = parse_packet(packet)
+            packet = Packet.from_bytes(data)
         except ValueError:
             return
 
-        if packet_type == PacketType.ACK:
+        if packet.packet_type == Packet.PacketType.ACK:
             elapsed = time.time() - self.start_time
             average_tx_speed = self.bytes_sent / elapsed
             self.stats.append(average_tx_speed)
@@ -350,52 +454,53 @@ class Receiver:
     last_timestamp: float
 
     def __init__(self, packet_io, linger):
-        self.reset()
+        self.jitter_stats = JitterStats()
         self.packet_io = packet_io
         self.packet_io.packet_listener = self
         self.linger = linger
         self.done = asyncio.Event()
+        self.reset()
 
     def reset(self):
         self.expected_packet_index = 0
         self.measurements = [(time.time(), 0)]
         self.total_bytes_received = 0
+        self.jitter_stats.reset()
 
-    def on_packet_received(self, packet):
+    def on_packet_received(self, data):
         try:
-            packet_type, packet_data = parse_packet(packet)
+            packet = Packet.from_bytes(data)
         except ValueError:
+            logging.exception("invalid packet")
             return
 
-        if packet_type == PacketType.RESET:
+        if packet.packet_type == Packet.PacketType.RESET:
             logging.info(color('=== Received RESET', 'magenta'))
             self.reset()
             return
 
-        try:
+        jitter = self.jitter_stats.on_packet_received(packet)
-            packet_flags, packet_index = parse_packet_sequence(packet_data)
-        except ValueError:
-            return
         logging.info(
-            f'<<< Received packet {packet_index}: '
+            f'<<< Received packet {packet.sequence}: '
-            f'flags=0x{packet_flags:02X}, '
+            f'flags={packet.flags}, '
-            f'{len(packet) + self.packet_io.overhead_size} bytes'
+            f'jitter={jitter:.4f}, '
+            f'{len(data) + self.packet_io.overhead_size} bytes',
         )
 
-        if packet_index != self.expected_packet_index:
+        if packet.sequence != self.expected_packet_index:
             logging.info(
                 color(
                     f'!!! Unexpected packet, expected {self.expected_packet_index} '
-                    f'but received {packet_index}'
+                    f'but received {packet.sequence}'
                 )
             )
 
         now = time.time()
         elapsed_since_start = now - self.measurements[0][0]
         elapsed_since_last = now - self.measurements[-1][0]
-        self.measurements.append((now, len(packet)))
+        self.measurements.append((now, len(data)))
-        self.total_bytes_received += len(packet)
+        self.total_bytes_received += len(data)
-        instant_rx_speed = len(packet) / elapsed_since_last
+        instant_rx_speed = len(data) / elapsed_since_last
         average_rx_speed = self.total_bytes_received / elapsed_since_start
         window = self.measurements[-64:]
         windowed_rx_speed = sum(measurement[1] for measurement in window[1:]) / (
@@ -411,15 +516,17 @@ class Receiver:
             )
         )
 
-        self.expected_packet_index = packet_index + 1
+        self.expected_packet_index = packet.sequence + 1
 
-        if packet_flags & PACKET_FLAG_LAST:
+        if packet.flags & Packet.PacketFlags.LAST:
             AsyncRunner.spawn(
                 self.packet_io.send_packet(
-                    struct.pack('>bbI', PacketType.ACK, packet_flags, packet_index)
+                    bytes(Packet(Packet.PacketType.ACK, packet.flags, packet.sequence))
                 )
             )
             logging.info(color('@@@ Received last packet', 'green'))
+            self.jitter_stats.show_stats()
+
             if not self.linger:
                 self.done.set()
 
@@ -479,25 +586,32 @@ class Ping:
                 await asyncio.sleep(self.tx_start_delay)
 
             logging.info(color('=== Sending RESET', 'magenta'))
-            await self.packet_io.send_packet(bytes([PacketType.RESET]))
+            await self.packet_io.send_packet(bytes(Packet(Packet.PacketType.RESET)))
 
-            packet_interval = self.pace / 1000
             start_time = time.time()
             self.next_expected_packet_index = 0
             for i in range(self.tx_packet_count):
-                target_time = start_time + (i * packet_interval)
+                target_time = start_time + (i * self.pace / 1000)
                 now = time.time()
                 if now < target_time:
                     await asyncio.sleep(target_time - now)
+                    now = time.time()
 
-                packet = struct.pack(
+                packet = bytes(
-                    '>bbI',
+                    Packet(
-                    PacketType.SEQUENCE,
+                        packet_type=Packet.PacketType.SEQUENCE,
-                    (PACKET_FLAG_LAST if i == self.tx_packet_count - 1 else 0),
+                        flags=(
-                    i,
+                            Packet.PacketFlags.LAST
-                ) + bytes(self.tx_packet_size - 6)
+                            if i == self.tx_packet_count - 1
+                            else 0
+                        ),
+                        sequence=i,
+                        timestamp=int((now - start_time) * 1000000),
+                        payload=bytes(self.tx_packet_size - 10),
+                    )
+                )
                 logging.info(color(f'Sending packet {i}', 'yellow'))
-                self.ping_times.append(time.time())
+                self.ping_times.append(now)
                 await self.packet_io.send_packet(packet)
 
             await self.done.wait()
@@ -531,40 +645,35 @@ class Ping:
         if self.repeat:
             logging.info(color('--- End of runs', 'blue'))
 
-    def on_packet_received(self, packet):
+    def on_packet_received(self, data):
         try:
-            packet_type, packet_data = parse_packet(packet)
+            packet = Packet.from_bytes(data)
         except ValueError:
             return
 
-        try:
+        if packet.packet_type == Packet.PacketType.ACK:
-            packet_flags, packet_index = parse_packet_sequence(packet_data)
+            elapsed = time.time() - self.ping_times[packet.sequence]
-        except ValueError:
-            return
-
-        if packet_type == PacketType.ACK:
-            elapsed = time.time() - self.ping_times[packet_index]
             rtt = elapsed * 1000
             self.rtts.append(rtt)
             logging.info(
                 color(
-                    f'<<< Received ACK [{packet_index}], RTT={rtt:.2f}ms',
+                    f'<<< Received ACK [{packet.sequence}], RTT={rtt:.2f}ms',
                     'green',
                 )
             )
 
-            if packet_index == self.next_expected_packet_index:
+            if packet.sequence == self.next_expected_packet_index:
                 self.next_expected_packet_index += 1
             else:
                 logging.info(
                     color(
                         f'!!! Unexpected packet, '
                         f'expected {self.next_expected_packet_index} '
-                        f'but received {packet_index}'
+                        f'but received {packet.sequence}'
                     )
                 )
 
-        if packet_flags & PACKET_FLAG_LAST:
+        if packet.flags & Packet.PacketFlags.LAST:
             self.done.set()
             return
 
@@ -576,89 +685,56 @@ class Pong:
     expected_packet_index: int
 
     def __init__(self, packet_io, linger):
-        self.reset()
+        self.jitter_stats = JitterStats()
         self.packet_io = packet_io
         self.packet_io.packet_listener = self
         self.linger = linger
         self.done = asyncio.Event()
+        self.reset()
 
     def reset(self):
         self.expected_packet_index = 0
-        self.receive_times = []
+        self.jitter_stats.reset()
-
-    def on_packet_received(self, packet):
-        self.receive_times.append(time.time())
 
+    def on_packet_received(self, data):
         try:
-            packet_type, packet_data = parse_packet(packet)
+            packet = Packet.from_bytes(data)
         except ValueError:
             return
 
-        if packet_type == PacketType.RESET:
+        if packet.packet_type == Packet.PacketType.RESET:
             logging.info(color('=== Received RESET', 'magenta'))
             self.reset()
             return
 
-        try:
+        jitter = self.jitter_stats.on_packet_received(packet)
-            packet_flags, packet_index = parse_packet_sequence(packet_data)
-        except ValueError:
-            return
-        interval = (
-            self.receive_times[-1] - self.receive_times[-2]
-            if len(self.receive_times) >= 2
-            else 0
-        )
         logging.info(
             color(
-                f'<<< Received packet {packet_index}: '
+                f'<<< Received packet {packet.sequence}: '
-                f'flags=0x{packet_flags:02X}, {len(packet)} bytes, '
+                f'flags={packet.flags}, {len(data)} bytes, '
-                f'interval={interval:.4f}',
+                f'jitter={jitter:.4f}',
                 'green',
             )
         )
 
-        if packet_index != self.expected_packet_index:
+        if packet.sequence != self.expected_packet_index:
             logging.info(
                 color(
                     f'!!! Unexpected packet, expected {self.expected_packet_index} '
-                    f'but received {packet_index}'
+                    f'but received {packet.sequence}'
                 )
             )
 
-        self.expected_packet_index = packet_index + 1
+        self.expected_packet_index = packet.sequence + 1
 
         AsyncRunner.spawn(
             self.packet_io.send_packet(
-                struct.pack('>bbI', PacketType.ACK, packet_flags, packet_index)
+                bytes(Packet(Packet.PacketType.ACK, packet.flags, packet.sequence))
             )
         )
 
-        if packet_flags & PACKET_FLAG_LAST:
+        if packet.flags & Packet.PacketFlags.LAST:
-            if len(self.receive_times) >= 3:
+            self.jitter_stats.show_stats()
-                # Show basic stats
-                intervals = [
-                    self.receive_times[i + 1] - self.receive_times[i]
-                    for i in range(len(self.receive_times) - 1)
-                ]
-                log_stats('Packet intervals', intervals, 3)
-
-                # Show a histogram
-                bin_count = 20
-                bins = [0] * bin_count
-                interval_min = min(intervals)
-                interval_max = max(intervals)
-                interval_range = interval_max - interval_min
-                bin_thresholds = [
-                    interval_min + i * (interval_range / bin_count)
-                    for i in range(bin_count)
-                ]
-                for interval in intervals:
-                    for i in reversed(range(bin_count)):
-                        if interval >= bin_thresholds[i]:
-                            bins[i] += 1
-                            break
-                for i in range(bin_count):
-                    logging.info(f'@@@ >= {bin_thresholds[i]:.4f}: {bins[i]}')
 
             if not self.linger:
                 self.done.set()
@@ -1180,6 +1256,7 @@ class Central(Connection.Listener):
             self.device.classic_enabled = self.classic
 
             # Set up a pairing config factory with minimal requirements.
+            self.device.config.keystore = "JsonKeyStore"
             self.device.pairing_config_factory = lambda _: PairingConfig(
                 sc=False, mitm=False, bonding=False
             )
@@ -1197,7 +1274,11 @@ class Central(Connection.Listener):
                 self.connection = await self.device.connect(
                     self.peripheral_address,
                     connection_parameters_preferences=self.connection_parameter_preferences,
-                    transport=BT_BR_EDR_TRANSPORT if self.classic else BT_LE_TRANSPORT,
+                    transport=(
+                        PhysicalTransport.BR_EDR
+                        if self.classic
+                        else PhysicalTransport.LE
+                    ),
                 )
             except CommandTimeoutError:
                 logging.info(color('!!! Connection timed out', 'red'))
@@ -1212,6 +1293,10 @@ class Central(Connection.Listener):
             self.connection.listener = self
             print_connection(self.connection)
 
+            if not self.classic:
+                phy = await self.connection.get_phy()
+                print_connection_phy(phy)
+
             # Switch roles if needed.
             if self.role_switch:
                 await switch_roles(self.connection, self.role_switch)
@@ -1268,8 +1353,8 @@ class Central(Connection.Listener):
     def on_connection_parameters_update(self):
         print_connection(self.connection)
 
-    def on_connection_phy_update(self):
+    def on_connection_phy_update(self, phy):
-        print_connection(self.connection)
+        print_connection_phy(phy)
 
     def on_connection_att_mtu_update(self):
         print_connection(self.connection)
@@ -1324,6 +1409,7 @@ class Peripheral(Device.Listener, Connection.Listener):
             self.device.classic_enabled = self.classic
 
             # Set up a pairing config factory with minimal requirements.
+            self.device.config.keystore = "JsonKeyStore"
             self.device.pairing_config_factory = lambda _: PairingConfig(
                 sc=False, mitm=False, bonding=False
             )
@@ -1395,8 +1481,8 @@ class Peripheral(Device.Listener, Connection.Listener):
     def on_connection_parameters_update(self):
         print_connection(self.connection)
 
-    def on_connection_phy_update(self):
+    def on_connection_phy_update(self, phy):
-        print_connection(self.connection)
+        print_connection_phy(phy)
 
     def on_connection_att_mtu_update(self):
         print_connection(self.connection)
@@ -1471,7 +1557,7 @@ def create_mode_factory(ctx, default_mode):
 def create_scenario_factory(ctx, default_scenario):
     scenario = ctx.obj['scenario']
     if scenario is None:
-        scenarion = default_scenario
+        scenario = default_scenario
 
     def create_scenario(packet_io):
         if scenario == 'send':
@@ -1530,6 +1616,7 @@ def create_scenario_factory(ctx, default_scenario):
     '--att-mtu',
     metavar='MTU',
     type=click.IntRange(23, 517),
+    default=517,
     help='GATT MTU (gatt-client mode)',
 )
 @click.option(
@@ -1605,7 +1692,7 @@ def create_scenario_factory(ctx, default_scenario):
     '--packet-size',
     '-s',
     metavar='SIZE',
-    type=click.IntRange(8, 8192),
+    type=click.IntRange(10, 8192),
     default=500,
     help='Packet size (send or ping scenario)',
 )

apps/console.py

@@ -22,7 +22,6 @@
 import asyncio
 import logging
 import os
-import random
 import re
 import humanize
 from typing import Optional, Union
@@ -56,8 +55,14 @@ 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.core import UUID, AdvertisingData, PhysicalTransport
-from bumble.device import ConnectionParametersPreferences, Device, Connection, Peer
+from bumble.device import (
+    ConnectionParametersPreferences,
+    ConnectionPHY,
+    Device,
+    Connection,
+    Peer,
+)
 from bumble.utils import AsyncRunner
 from bumble.transport import open_transport_or_link
 from bumble.gatt import Characteristic, Service, CharacteristicDeclaration, Descriptor
@@ -125,6 +130,7 @@ def parse_phys(phys):
 # -----------------------------------------------------------------------------
 class ConsoleApp:
     connected_peer: Optional[Peer]
+    connection_phy: Optional[ConnectionPHY]
 
     def __init__(self):
         self.known_addresses = set()
@@ -132,6 +138,7 @@ class ConsoleApp:
         self.known_local_attributes = []
         self.device = None
         self.connected_peer = None
+        self.connection_phy = None
         self.top_tab = 'device'
         self.monitor_rssi = False
         self.connection_rssi = None
@@ -328,14 +335,14 @@ class ConsoleApp:
             elif self.connected_peer:
                 connection = self.connected_peer.connection
                 connection_parameters = (
-                    f'{connection.parameters.connection_interval}/'
+                    f'{connection.parameters.connection_interval:.2f}/'
                     f'{connection.parameters.peripheral_latency}/'
-                    f'{connection.parameters.supervision_timeout}'
+                    f'{connection.parameters.supervision_timeout:.2f}'
                 )
-                if connection.transport == BT_LE_TRANSPORT:
+                if self.connection_phy is not None:
                     phy_state = (
-                        f' RX={le_phy_name(connection.phy.rx_phy)}/'
+                        f' RX={le_phy_name(self.connection_phy.rx_phy)}/'
-                        f'TX={le_phy_name(connection.phy.tx_phy)}'
+                        f'TX={le_phy_name(self.connection_phy.tx_phy)}'
                     )
                 else:
                     phy_state = ''
@@ -654,11 +661,12 @@ class ConsoleApp:
         self.append_to_output('connecting...')
 
         try:
-            await self.device.connect(
+            connection = await self.device.connect(
                 params[0],
                 connection_parameters_preferences=connection_parameters_preferences,
                 timeout=DEFAULT_CONNECTION_TIMEOUT,
             )
+            self.connection_phy = await connection.get_phy()
             self.top_tab = 'services'
         except bumble.core.TimeoutError:
             self.show_error('connection timed out')
@@ -838,8 +846,8 @@ class ConsoleApp:
 
         phy = await self.connected_peer.connection.get_phy()
         self.append_to_output(
-            f'PHY: RX={HCI_Constant.le_phy_name(phy[0])}, '
+            f'PHY: RX={HCI_Constant.le_phy_name(phy.rx_phy)}, '
-            f'TX={HCI_Constant.le_phy_name(phy[1])}'
+            f'TX={HCI_Constant.le_phy_name(phy.tx_phy)}'
         )
 
     async def do_request_mtu(self, params):
@@ -1076,10 +1084,9 @@ class DeviceListener(Device.Listener, Connection.Listener):
             f'{self.app.connected_peer.connection.parameters}'
         )
 
-    def on_connection_phy_update(self):
+    def on_connection_phy_update(self, phy):
-        self.app.append_to_output(
+        self.app.connection_phy = phy
-            f'connection phy update: {self.app.connected_peer.connection.phy}'
+        self.app.append_to_output(f'connection phy update: {phy}')
-        )
 
     def on_connection_att_mtu_update(self):
         self.app.append_to_output(

apps/gg_bridge.py

@@ -234,7 +234,7 @@ class GattlinkNodeBridge(GattlinkL2capEndpoint, Device.Listener):
             Characteristic.WRITEABLE,
             CharacteristicValue(write=self.on_rx_write),
         )
-        self.tx_characteristic = Characteristic(
+        self.tx_characteristic: Characteristic[bytes] = Characteristic(
             GG_GATTLINK_TX_CHARACTERISTIC_UUID,
             Characteristic.Properties.NOTIFY,
             Characteristic.READABLE,

apps/lea_unicast/app.py

@@ -37,6 +37,7 @@ import click
 import aiohttp.web
 
 import bumble
+from bumble import utils
 from bumble.core import AdvertisingData
 from bumble.colors import color
 from bumble.device import Device, DeviceConfiguration, AdvertisingParameters, CisLink
@@ -359,7 +360,9 @@ class Speaker:
                 pcm = decoder.decode(
                     pdu.iso_sdu_fragment, bit_depth=DEFAULT_PCM_BYTES_PER_SAMPLE * 8
                 )
-                self.device.abort_on('disconnection', self.ui_server.send_audio(pcm))
+                utils.cancel_on_event(
+                    self.device, 'disconnection', self.ui_server.send_audio(pcm)
+                )
 
             def on_ase_state_change(ase: ascs.AseStateMachine) -> None:
                 codec_config = ase.codec_specific_configuration
@@ -373,7 +376,8 @@ class Speaker:
                             or codec_config.codec_frames_per_sdu is None
                         ):
                             return
-                        ase.cis_link.abort_on(
+                        utils.cancel_on_event(
+                            ase.cis_link,
                             'disconnection',
                             lc3_source_task(
                                 filename=self.lc3_input_file_path,

apps/pair.py

@@ -18,9 +18,12 @@
 import asyncio
 import os
 import logging
+import struct
+
 import click
 from prompt_toolkit.shortcuts import PromptSession
 
+from bumble.a2dp import make_audio_sink_service_sdp_records
 from bumble.colors import color
 from bumble.device import Device, Peer
 from bumble.transport import open_transport_or_link
@@ -30,17 +33,20 @@ from bumble.smp import error_name as smp_error_name
 from bumble.keys import JsonKeyStore
 from bumble.core import (
     AdvertisingData,
+    Appearance,
     ProtocolError,
-    BT_LE_TRANSPORT,
+    PhysicalTransport,
-    BT_BR_EDR_TRANSPORT,
+    UUID,
 )
 from bumble.gatt import (
     GATT_DEVICE_NAME_CHARACTERISTIC,
     GATT_GENERIC_ACCESS_SERVICE,
+    GATT_HEART_RATE_SERVICE,
+    GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
     Service,
     Characteristic,
-    CharacteristicValue,
 )
+from bumble.hci import OwnAddressType
 from bumble.att import (
     ATT_Error,
     ATT_INSUFFICIENT_AUTHENTICATION_ERROR,
@@ -63,7 +69,7 @@ class Waiter:
         self.linger = linger
 
     def terminate(self):
-        if not self.linger:
+        if not self.linger and not self.done.done:
             self.done.set_result(None)
 
     async def wait_until_terminated(self):
@@ -194,7 +200,7 @@ class Delegate(PairingDelegate):
 
 # -----------------------------------------------------------------------------
 async def get_peer_name(peer, mode):
-    if mode == 'classic':
+    if peer.connection.transport == PhysicalTransport.BR_EDR:
         return await peer.request_name()
 
     # Try to get the peer name from GATT
@@ -226,13 +232,14 @@ def read_with_error(connection):
     raise ATT_Error(ATT_INSUFFICIENT_AUTHENTICATION_ERROR)
 
 
-def write_with_error(connection, _value):
+# -----------------------------------------------------------------------------
-    if not connection.is_encrypted:
+def sdp_records():
-        raise ATT_Error(ATT_INSUFFICIENT_ENCRYPTION_ERROR)
+    service_record_handle = 0x00010001
-
+    return {
-    if not AUTHENTICATION_ERROR_RETURNED[1]:
+        service_record_handle: make_audio_sink_service_sdp_records(
-        AUTHENTICATION_ERROR_RETURNED[1] = True
+            service_record_handle
-        raise ATT_Error(ATT_INSUFFICIENT_AUTHENTICATION_ERROR)
+        )
+    }
 
 
 # -----------------------------------------------------------------------------
@@ -240,15 +247,19 @@ def on_connection(connection, request):
     print(color(f'<<< Connection: {connection}', 'green'))
 
     # Listen for pairing events
-    connection.on('pairing_start', on_pairing_start)
+    connection.on(connection.EVENT_PAIRING_START, on_pairing_start)
-    connection.on('pairing', lambda keys: on_pairing(connection, keys))
+    connection.on(connection.EVENT_PAIRING, lambda keys: on_pairing(connection, keys))
     connection.on(
-        'pairing_failure', lambda reason: on_pairing_failure(connection, reason)
+        connection.EVENT_CLASSIC_PAIRING, lambda: on_classic_pairing(connection)
+    )
+    connection.on(
+        connection.EVENT_PAIRING_FAILURE,
+        lambda reason: on_pairing_failure(connection, reason),
     )
 
     # Listen for encryption changes
     connection.on(
-        'connection_encryption_change',
+        connection.EVENT_CONNECTION_ENCRYPTION_CHANGE,
         lambda: on_connection_encryption_change(connection),
     )
 
@@ -289,6 +300,20 @@ async def on_pairing(connection, keys):
     Waiter.instance.terminate()
 
 
+# -----------------------------------------------------------------------------
+@AsyncRunner.run_in_task()
+async def on_classic_pairing(connection):
+    print(color('***-----------------------------------', 'cyan'))
+    print(
+        color(
+            f'*** Paired [Classic]! (peer identity={connection.peer_address})', 'cyan'
+        )
+    )
+    print(color('***-----------------------------------', 'cyan'))
+    await asyncio.sleep(POST_PAIRING_DELAY)
+    Waiter.instance.terminate()
+
+
 # -----------------------------------------------------------------------------
 @AsyncRunner.run_in_task()
 async def on_pairing_failure(connection, reason):
@@ -306,6 +331,7 @@ async def pair(
     mitm,
     bond,
     ctkd,
+    advertising_address,
     identity_address,
     linger,
     io,
@@ -314,6 +340,8 @@ async def pair(
     request,
     print_keys,
     keystore_file,
+    advertise_service_uuids,
+    advertise_appearance,
     device_config,
     hci_transport,
     address_or_name,
@@ -329,29 +357,33 @@ async def pair(
 
         # Expose a GATT characteristic that can be used to trigger pairing by
         # responding with an authentication error when read
-        if mode == 'le':
+        if mode in ('le', 'dual'):
-            device.le_enabled = True
             device.add_service(
                 Service(
-                    '50DB505C-8AC4-4738-8448-3B1D9CC09CC5',
+                    GATT_HEART_RATE_SERVICE,
                     [
                         Characteristic(
-                            '552957FB-CF1F-4A31-9535-E78847E1A714',
+                            GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
-                            Characteristic.Properties.READ
+                            Characteristic.Properties.READ,
-                            | Characteristic.Properties.WRITE,
+                            Characteristic.READ_REQUIRES_AUTHENTICATION,
-                            Characteristic.READABLE | Characteristic.WRITEABLE,
+                            bytes(1),
-                            CharacteristicValue(
-                                read=read_with_error, write=write_with_error
-                            ),
                         )
                     ],
                 )
             )
 
-        # Select LE or Classic
+        # LE and Classic support
-        if mode == 'classic':
+        if mode in ('classic', 'dual'):
             device.classic_enabled = True
             device.classic_smp_enabled = ctkd
+        if mode in ('le', 'dual'):
+            device.le_enabled = True
+        if mode == 'dual':
+            device.le_simultaneous_enabled = True
+
+        # Setup SDP
+        if mode in ('classic', 'dual'):
+            device.sdp_service_records = sdp_records()
 
         # Get things going
         await device.power_on()
@@ -422,7 +454,9 @@ async def pair(
             print(color(f'=== Connecting to {address_or_name}...', 'green'))
             connection = await device.connect(
                 address_or_name,
-                transport=BT_LE_TRANSPORT if mode == 'le' else BT_BR_EDR_TRANSPORT,
+                transport=(
+                    PhysicalTransport.LE if mode == 'le' else PhysicalTransport.BR_EDR
+                ),
             )
 
             if not request:
@@ -435,13 +469,109 @@ async def pair(
                     print(color(f'Pairing failed: {error}', 'red'))
 
         else:
-            if mode == 'le':
+            if mode in ('le', 'dual'):
-                # Advertise so that peers can find us and connect
+                # Advertise so that peers can find us and connect.
-                await device.start_advertising(auto_restart=True)
+                # Include the heart rate service UUID in the advertisement data
-            else:
+                # so that devices like iPhones can show this device in their
+                # Bluetooth selector.
+                service_uuids_16 = []
+                service_uuids_32 = []
+                service_uuids_128 = []
+                if advertise_service_uuids:
+                    for uuid in advertise_service_uuids:
+                        uuid = uuid.replace("-", "")
+                        if len(uuid) == 4:
+                            service_uuids_16.append(UUID(uuid))
+                        elif len(uuid) == 8:
+                            service_uuids_32.append(UUID(uuid))
+                        elif len(uuid) == 32:
+                            service_uuids_128.append(UUID(uuid))
+                        else:
+                            print(color('Invalid UUID format', 'red'))
+                            return
+                else:
+                    service_uuids_16.append(GATT_HEART_RATE_SERVICE)
+
+                flags = AdvertisingData.Flags.LE_LIMITED_DISCOVERABLE_MODE
+                if mode == 'le':
+                    flags |= AdvertisingData.Flags.BR_EDR_NOT_SUPPORTED
+                if mode == 'dual':
+                    flags |= AdvertisingData.Flags.SIMULTANEOUS_LE_BR_EDR_CAPABLE
+
+                ad_structs = [
+                    (
+                        AdvertisingData.FLAGS,
+                        bytes([flags]),
+                    ),
+                    (AdvertisingData.COMPLETE_LOCAL_NAME, 'Bumble'.encode()),
+                ]
+                if service_uuids_16:
+                    ad_structs.append(
+                        (
+                            AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+                            b"".join(bytes(uuid) for uuid in service_uuids_16),
+                        )
+                    )
+                if service_uuids_32:
+                    ad_structs.append(
+                        (
+                            AdvertisingData.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+                            b"".join(bytes(uuid) for uuid in service_uuids_32),
+                        )
+                    )
+                if service_uuids_128:
+                    ad_structs.append(
+                        (
+                            AdvertisingData.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+                            b"".join(bytes(uuid) for uuid in service_uuids_128),
+                        )
+                    )
+
+                if advertise_appearance:
+                    advertise_appearance = advertise_appearance.upper()
+                    try:
+                        advertise_appearance_int = int(advertise_appearance)
+                    except ValueError:
+                        category, subcategory = advertise_appearance.split('/')
+                        try:
+                            category_enum = Appearance.Category[category]
+                        except ValueError:
+                            print(
+                                color(f'Invalid appearance category {category}', 'red')
+                            )
+                            return
+                        subcategory_class = Appearance.SUBCATEGORY_CLASSES[
+                            category_enum
+                        ]
+                        try:
+                            subcategory_enum = subcategory_class[subcategory]
+                        except ValueError:
+                            print(color(f'Invalid subcategory {subcategory}', 'red'))
+                            return
+                        advertise_appearance_int = int(
+                            Appearance(category_enum, subcategory_enum)
+                        )
+                    ad_structs.append(
+                        (
+                            AdvertisingData.APPEARANCE,
+                            struct.pack('<H', advertise_appearance_int),
+                        )
+                    )
+                device.advertising_data = bytes(AdvertisingData(ad_structs))
+                await device.start_advertising(
+                    auto_restart=True,
+                    own_address_type=(
+                        OwnAddressType.PUBLIC
+                        if advertising_address == 'public'
+                        else OwnAddressType.RANDOM
+                    ),
+                )
+
+            if mode in ('classic', 'dual'):
                 # Become discoverable and connectable
                 await device.set_discoverable(True)
                 await device.set_connectable(True)
+                print(color('Ready for connections on', 'blue'), device.public_address)
 
         # Run until the user asks to exit
         await Waiter.instance.wait_until_terminated()
@@ -461,7 +591,10 @@ class LogHandler(logging.Handler):
 # -----------------------------------------------------------------------------
 @click.command()
 @click.option(
-    '--mode', type=click.Choice(['le', 'classic']), default='le', show_default=True
+    '--mode',
+    type=click.Choice(['le', 'classic', 'dual']),
+    default='le',
+    show_default=True,
 )
 @click.option(
     '--sc',
@@ -483,6 +616,10 @@ class LogHandler(logging.Handler):
     help='Enable CTKD',
     show_default=True,
 )
+@click.option(
+    '--advertising-address',
+    type=click.Choice(['random', 'public']),
+)
 @click.option(
     '--identity-address',
     type=click.Choice(['random', 'public']),
@@ -511,9 +648,20 @@ class LogHandler(logging.Handler):
 @click.option('--print-keys', is_flag=True, help='Print the bond keys before pairing')
 @click.option(
     '--keystore-file',
-    metavar='<filename>',
+    metavar='FILENAME',
     help='File in which to store the pairing keys',
 )
+@click.option(
+    '--advertise-service-uuid',
+    metavar="UUID",
+    multiple=True,
+    help="Advertise a GATT service UUID (may be specified more than once)",
+)
+@click.option(
+    '--advertise-appearance',
+    metavar='APPEARANCE',
+    help='Advertise an Appearance ID (int value or string)',
+)
 @click.argument('device-config')
 @click.argument('hci_transport')
 @click.argument('address-or-name', required=False)
@@ -523,6 +671,7 @@ def main(
     mitm,
     bond,
     ctkd,
+    advertising_address,
     identity_address,
     linger,
     io,
@@ -531,6 +680,8 @@ def main(
     request,
     print_keys,
     keystore_file,
+    advertise_service_uuid,
+    advertise_appearance,
     device_config,
     hci_transport,
     address_or_name,
@@ -549,6 +700,7 @@ def main(
             mitm,
             bond,
             ctkd,
+            advertising_address,
             identity_address,
             linger,
             io,
@@ -557,6 +709,8 @@ def main(
             request,
             print_keys,
             keystore_file,
+            advertise_service_uuid,
+            advertise_appearance,
             device_config,
             hci_transport,
             address_or_name,

apps/player/player.py

@@ -56,7 +56,7 @@ from bumble.core import (
     AdvertisingData,
     ConnectionError as BumbleConnectionError,
     DeviceClass,
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
 )
 from bumble.device import Connection, Device, DeviceConfiguration
 from bumble.hci import Address, HCI_CONNECTION_ALREADY_EXISTS_ERROR, HCI_Constant
@@ -286,7 +286,7 @@ class Player:
 
     async def connect(self, device: Device, address: str) -> Connection:
         print(color(f"Connecting to {address}...", "green"))
-        connection = await device.connect(address, transport=BT_BR_EDR_TRANSPORT)
+        connection = await device.connect(address, transport=PhysicalTransport.BR_EDR)
 
         # Request authentication
         if self.authenticate:
@@ -402,7 +402,7 @@ class Player:
 
     async def pair(self, device: Device, address: str) -> None:
         print(color(f"Connecting to {address}...", "green"))
-        connection = await device.connect(address, transport=BT_BR_EDR_TRANSPORT)
+        connection = await device.connect(address, transport=PhysicalTransport.BR_EDR)
 
         print(color("Pairing...", "magenta"))
         await connection.authenticate()

apps/rfcomm_bridge.py

@@ -271,7 +271,7 @@ class ClientBridge:
         print(color(f"@@@ Connecting to Bluetooth {self.address}", "blue"))
         assert self.device
         self.connection = await self.device.connect(
-            self.address, transport=core.BT_BR_EDR_TRANSPORT
+            self.address, transport=core.PhysicalTransport.BR_EDR
         )
         print(color(f"@@@ Bluetooth connection: {self.connection}", "blue"))
         self.connection.on("disconnection", self.on_disconnection)

apps/speaker/speaker.py

@@ -34,7 +34,7 @@ from aiohttp import web
 
 import bumble
 from bumble.colors import color
-from bumble.core import BT_BR_EDR_TRANSPORT, CommandTimeoutError
+from bumble.core import PhysicalTransport, CommandTimeoutError
 from bumble.device import Connection, Device, DeviceConfiguration
 from bumble.hci import HCI_StatusError
 from bumble.pairing import PairingConfig
@@ -568,7 +568,9 @@ class Speaker:
     async def connect(self, address):
         # Connect to the source
         print(f'=== Connecting to {address}...')
-        connection = await self.device.connect(address, transport=BT_BR_EDR_TRANSPORT)
+        connection = await self.device.connect(
+            address, transport=PhysicalTransport.BR_EDR
+        )
         print(f'=== Connected to {connection.peer_address}')
 
         # Request authentication

bumble/a2dp.py

@@ -26,9 +26,9 @@ from typing import Awaitable, Callable
 from typing_extensions import ClassVar, Self
 
 
-from .codecs import AacAudioRtpPacket
+from bumble.codecs import AacAudioRtpPacket
-from .company_ids import COMPANY_IDENTIFIERS
+from bumble.company_ids import COMPANY_IDENTIFIERS
-from .sdp import (
+from bumble.sdp import (
     DataElement,
     ServiceAttribute,
     SDP_PUBLIC_BROWSE_ROOT,
@@ -38,7 +38,7 @@ from .sdp import (
     SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
     SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
 )
-from .core import (
+from bumble.core import (
     BT_L2CAP_PROTOCOL_ID,
     BT_AUDIO_SOURCE_SERVICE,
     BT_AUDIO_SINK_SERVICE,
@@ -46,7 +46,7 @@ from .core import (
     BT_ADVANCED_AUDIO_DISTRIBUTION_SERVICE,
     name_or_number,
 )
-from .rtp import MediaPacket
+from bumble.rtp import MediaPacket
 
 
 # -----------------------------------------------------------------------------
@@ -155,7 +155,7 @@ def flags_to_list(flags, values):
 # -----------------------------------------------------------------------------
 def make_audio_source_service_sdp_records(service_record_handle, version=(1, 3)):
     # pylint: disable=import-outside-toplevel
-    from .avdtp import AVDTP_PSM
+    from bumble.avdtp import AVDTP_PSM
 
     version_int = version[0] << 8 | version[1]
     return [
@@ -209,7 +209,7 @@ def make_audio_source_service_sdp_records(service_record_handle, version=(1, 3))
 # -----------------------------------------------------------------------------
 def make_audio_sink_service_sdp_records(service_record_handle, version=(1, 3)):
     # pylint: disable=import-outside-toplevel
-    from .avdtp import AVDTP_PSM
+    from bumble.avdtp import AVDTP_PSM
 
     version_int = version[0] << 8 | version[1]
     return [

bumble/att.py

@@ -29,27 +29,32 @@ import functools
 import inspect
 import struct
 from typing import (
-    Any,
     Awaitable,
     Callable,
+    Generic,
     Dict,
     List,
     Optional,
     Type,
+    TypeVar,
     Union,
     TYPE_CHECKING,
 )
 
-from pyee import EventEmitter
 
 from bumble import utils
-from bumble.core import UUID, name_or_number, ProtocolError
+from bumble.core import UUID, name_or_number, InvalidOperationError, ProtocolError
 from bumble.hci import HCI_Object, key_with_value
 from bumble.colors import color
 
+# -----------------------------------------------------------------------------
+# Typing
+# -----------------------------------------------------------------------------
 if TYPE_CHECKING:
     from bumble.device import Connection
 
+_T = TypeVar('_T')
+
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
@@ -217,7 +222,12 @@ UUID_2_FIELD_SPEC    = lambda x, y: UUID.parse_uuid_2(x, y)  # noqa: E731
 # Exceptions
 # -----------------------------------------------------------------------------
 class ATT_Error(ProtocolError):
-    def __init__(self, error_code, att_handle=0x0000, message=''):
+    error_code: int
+    att_handle: int
+
+    def __init__(
+        self, error_code: int, att_handle: int = 0x0000, message: str = ''
+    ) -> None:
         super().__init__(
             error_code,
             error_namespace='att',
@@ -227,7 +237,10 @@ class ATT_Error(ProtocolError):
         self.message = message
 
     def __str__(self):
-        return f'ATT_Error(error={self.error_name}, handle={self.att_handle:04X}): {self.message}'
+        return (
+            f'ATT_Error(error={self.error_name}, '
+            f'handle={self.att_handle:04X}): {self.message}'
+        )
 
 
 # -----------------------------------------------------------------------------
@@ -748,7 +761,7 @@ class ATT_Handle_Value_Confirmation(ATT_PDU):
 
 
 # -----------------------------------------------------------------------------
-class AttributeValue:
+class AttributeValue(Generic[_T]):
     '''
     Attribute value where reading and/or writing is delegated to functions
     passed as arguments to the constructor.
@@ -757,33 +770,34 @@ class AttributeValue:
     def __init__(
         self,
         read: Union[
-            Callable[[Optional[Connection]], Any],
+            Callable[[Optional[Connection]], _T],
-            Callable[[Optional[Connection]], Awaitable[Any]],
+            Callable[[Optional[Connection]], Awaitable[_T]],
             None,
         ] = None,
         write: Union[
-            Callable[[Optional[Connection], Any], None],
+            Callable[[Optional[Connection], _T], None],
-            Callable[[Optional[Connection], Any], Awaitable[None]],
+            Callable[[Optional[Connection], _T], Awaitable[None]],
             None,
         ] = None,
     ):
         self._read = read
         self._write = write
 
-    def read(self, connection: Optional[Connection]) -> Union[bytes, Awaitable[bytes]]:
+    def read(self, connection: Optional[Connection]) -> Union[_T, Awaitable[_T]]:
-        return self._read(connection) if self._read else b''
+        if self._read is None:
+            raise InvalidOperationError('AttributeValue has no read function')
+        return self._read(connection)
 
     def write(
-        self, connection: Optional[Connection], value: bytes
+        self, connection: Optional[Connection], value: _T
     ) -> Union[Awaitable[None], None]:
-        if self._write:
+        if self._write is None:
-            return self._write(connection, value)
+            raise InvalidOperationError('AttributeValue has no write function')
-
+        return self._write(connection, value)
-        return None
 
 
 # -----------------------------------------------------------------------------
-class Attribute(EventEmitter):
+class Attribute(utils.EventEmitter, Generic[_T]):
     class Permissions(enum.IntFlag):
         READABLE = 0x01
         WRITEABLE = 0x02
@@ -822,15 +836,18 @@ class Attribute(EventEmitter):
     READ_REQUIRES_AUTHORIZATION = Permissions.READ_REQUIRES_AUTHORIZATION
     WRITE_REQUIRES_AUTHORIZATION = Permissions.WRITE_REQUIRES_AUTHORIZATION
 
-    value: Any
+    EVENT_READ = "read"
+    EVENT_WRITE = "write"
+
+    value: Union[AttributeValue[_T], _T, None]
 
     def __init__(
         self,
         attribute_type: Union[str, bytes, UUID],
         permissions: Union[str, Attribute.Permissions],
-        value: Any = b'',
+        value: Union[AttributeValue[_T], _T, None] = None,
     ) -> None:
-        EventEmitter.__init__(self)
+        utils.EventEmitter.__init__(self)
         self.handle = 0
         self.end_group_handle = 0
         if isinstance(permissions, str):
@@ -848,11 +865,11 @@ class Attribute(EventEmitter):
 
         self.value = value
 
-    def encode_value(self, value: Any) -> bytes:
+    def encode_value(self, value: _T) -> bytes:
-        return value
+        return value  # type: ignore
 
-    def decode_value(self, value_bytes: bytes) -> Any:
+    def decode_value(self, value: bytes) -> _T:
-        return value_bytes
+        return value  # type: ignore
 
     async def read_value(self, connection: Optional[Connection]) -> bytes:
         if (
@@ -877,11 +894,14 @@ class Attribute(EventEmitter):
                 error_code=ATT_INSUFFICIENT_AUTHORIZATION_ERROR, att_handle=self.handle
             )
 
-        if hasattr(self.value, 'read'):
+        value: Union[_T, None]
+        if isinstance(self.value, AttributeValue):
             try:
-                value = self.value.read(connection)
+                read_value = self.value.read(connection)
-                if inspect.isawaitable(value):
+                if inspect.isawaitable(read_value):
-                    value = await value
+                    value = await read_value
+                else:
+                    value = read_value
             except ATT_Error as error:
                 raise ATT_Error(
                     error_code=error.error_code, att_handle=self.handle
@@ -889,20 +909,24 @@ class Attribute(EventEmitter):
         else:
             value = self.value
 
-        self.emit('read', connection, value)
+        self.emit(self.EVENT_READ, connection, b'' if value is None else value)
 
-        return self.encode_value(value)
+        return b'' if value is None else self.encode_value(value)
 
-    async def write_value(self, connection: Connection, value_bytes: bytes) -> None:
+    async def write_value(self, connection: Optional[Connection], value: bytes) -> None:
         if (
-            self.permissions & self.WRITE_REQUIRES_ENCRYPTION
+            (self.permissions & self.WRITE_REQUIRES_ENCRYPTION)
-        ) and not connection.encryption:
+            and connection is not None
+            and not connection.encryption
+        ):
             raise ATT_Error(
                 error_code=ATT_INSUFFICIENT_ENCRYPTION_ERROR, att_handle=self.handle
             )
         if (
-            self.permissions & self.WRITE_REQUIRES_AUTHENTICATION
+            (self.permissions & self.WRITE_REQUIRES_AUTHENTICATION)
-        ) and not connection.authenticated:
+            and connection is not None
+            and not connection.authenticated
+        ):
             raise ATT_Error(
                 error_code=ATT_INSUFFICIENT_AUTHENTICATION_ERROR, att_handle=self.handle
             )
@@ -912,11 +936,11 @@ class Attribute(EventEmitter):
                 error_code=ATT_INSUFFICIENT_AUTHORIZATION_ERROR, att_handle=self.handle
             )
 
-        value = self.decode_value(value_bytes)
+        decoded_value = self.decode_value(value)
 
-        if hasattr(self.value, 'write'):
+        if isinstance(self.value, AttributeValue):
             try:
-                result = self.value.write(connection, value)
+                result = self.value.write(connection, decoded_value)
                 if inspect.isawaitable(result):
                     await result
             except ATT_Error as error:
@@ -924,9 +948,9 @@ class Attribute(EventEmitter):
                     error_code=error.error_code, att_handle=self.handle
                 ) from error
         else:
-            self.value = value
+            self.value = decoded_value
 
-        self.emit('write', connection, value)
+        self.emit(self.EVENT_WRITE, connection, decoded_value)
 
     def __repr__(self):
         if isinstance(self.value, bytes):

bumble/avc.py

@@ -21,7 +21,7 @@ import struct
 from typing import Dict, Type, Union, Tuple
 
 from bumble import core
-from bumble.utils import OpenIntEnum
+from bumble import utils
 
 
 # -----------------------------------------------------------------------------
@@ -43,7 +43,7 @@ class Frame:
         EXTENDED = 0x1E
         UNIT = 0x1F
 
-    class OperationCode(OpenIntEnum):
+    class OperationCode(utils.OpenIntEnum):
         # 0x00 - 0x0F: Unit and subunit commands
         VENDOR_DEPENDENT = 0x00
         RESERVE = 0x01
@@ -204,7 +204,7 @@ class Frame:
 
 # -----------------------------------------------------------------------------
 class CommandFrame(Frame):
-    class CommandType(OpenIntEnum):
+    class CommandType(utils.OpenIntEnum):
         # AV/C Digital Interface Command Set General Specification Version 4.1
         # Table 7.1
         CONTROL = 0x00
@@ -240,7 +240,7 @@ class CommandFrame(Frame):
 
 # -----------------------------------------------------------------------------
 class ResponseFrame(Frame):
-    class ResponseCode(OpenIntEnum):
+    class ResponseCode(utils.OpenIntEnum):
         # AV/C Digital Interface Command Set General Specification Version 4.1
         # Table 7.2
         NOT_IMPLEMENTED = 0x08
@@ -368,7 +368,7 @@ class PassThroughFrame:
         PRESSED = 0
         RELEASED = 1
 
-    class OperationId(OpenIntEnum):
+    class OperationId(utils.OpenIntEnum):
         SELECT = 0x00
         UP = 0x01
         DOWN = 0x01

bumble/avctp.py

@@ -166,8 +166,8 @@ class Protocol:
 
         # Register to receive PDUs from the channel
         l2cap_channel.sink = self.on_pdu
-        l2cap_channel.on("open", self.on_l2cap_channel_open)
+        l2cap_channel.on(l2cap_channel.EVENT_OPEN, self.on_l2cap_channel_open)
-        l2cap_channel.on("close", self.on_l2cap_channel_close)
+        l2cap_channel.on(l2cap_channel.EVENT_CLOSE, self.on_l2cap_channel_close)
 
     def on_l2cap_channel_open(self):
         logger.debug(color("<<< AVCTP channel open", "magenta"))

bumble/avdtp.py

@@ -37,16 +37,15 @@ from typing import (
     cast,
 )
 
-from pyee import EventEmitter
 
-from .core import (
+from bumble.core import (
     BT_ADVANCED_AUDIO_DISTRIBUTION_SERVICE,
     InvalidStateError,
     ProtocolError,
     InvalidArgumentError,
     name_or_number,
 )
-from .a2dp import (
+from bumble.a2dp import (
     A2DP_CODEC_TYPE_NAMES,
     A2DP_MPEG_2_4_AAC_CODEC_TYPE,
     A2DP_NON_A2DP_CODEC_TYPE,
@@ -56,9 +55,9 @@ from .a2dp import (
     SbcMediaCodecInformation,
     VendorSpecificMediaCodecInformation,
 )
-from .rtp import MediaPacket
+from bumble.rtp import MediaPacket
-from . import sdp, device, l2cap
+from bumble import sdp, device, l2cap, utils
-from .colors import color
+from bumble.colors import color
 
 
 # -----------------------------------------------------------------------------
@@ -897,7 +896,7 @@ class Set_Configuration_Reject(Message):
         self.service_category = self.payload[0]
         self.error_code = self.payload[1]
 
-    def __init__(self, service_category, error_code):
+    def __init__(self, error_code: int, service_category: int = 0) -> None:
         super().__init__(payload=bytes([service_category, error_code]))
         self.service_category = service_category
         self.error_code = error_code
@@ -1133,6 +1132,14 @@ class Security_Control_Command(Message):
     See Bluetooth AVDTP spec - 8.17.1 Security Control Command
     '''
 
+    def init_from_payload(self):
+        # pylint: disable=attribute-defined-outside-init
+        self.acp_seid = self.payload[0] >> 2
+        self.data = self.payload[1:]
+
+    def __str__(self) -> str:
+        return self.to_string([f'ACP_SEID: {self.acp_seid}', f'data:    {self.data}'])
+
 
 # -----------------------------------------------------------------------------
 @Message.subclass
@@ -1194,13 +1201,16 @@ class DelayReport_Reject(Simple_Reject):
 
 
 # -----------------------------------------------------------------------------
-class Protocol(EventEmitter):
+class Protocol(utils.EventEmitter):
     local_endpoints: List[LocalStreamEndPoint]
     remote_endpoints: Dict[int, DiscoveredStreamEndPoint]
     streams: Dict[int, Stream]
     transaction_results: List[Optional[asyncio.Future[Message]]]
     channel_connector: Callable[[], Awaitable[l2cap.ClassicChannel]]
 
+    EVENT_OPEN = "open"
+    EVENT_CLOSE = "close"
+
     class PacketType(enum.IntEnum):
         SINGLE_PACKET = 0
         START_PACKET = 1
@@ -1240,8 +1250,8 @@ class Protocol(EventEmitter):
 
         # Register to receive PDUs from the channel
         l2cap_channel.sink = self.on_pdu
-        l2cap_channel.on('open', self.on_l2cap_channel_open)
+        l2cap_channel.on(l2cap_channel.EVENT_OPEN, self.on_l2cap_channel_open)
-        l2cap_channel.on('close', self.on_l2cap_channel_close)
+        l2cap_channel.on(l2cap_channel.EVENT_CLOSE, self.on_l2cap_channel_close)
 
     def get_local_endpoint_by_seid(self, seid: int) -> Optional[LocalStreamEndPoint]:
         if 0 < seid <= len(self.local_endpoints):
@@ -1411,20 +1421,20 @@ class Protocol(EventEmitter):
             self.transaction_results[transaction_label] = None
             self.transaction_semaphore.release()
 
-    def on_l2cap_connection(self, channel):
+    def on_l2cap_connection(self, channel: l2cap.ClassicChannel) -> None:
         # Forward the channel to the endpoint that's expecting it
         if self.channel_acceptor is None:
             logger.warning(color('!!! l2cap connection with no acceptor', 'red'))
             return
         self.channel_acceptor.on_l2cap_connection(channel)
 
-    def on_l2cap_channel_open(self):
+    def on_l2cap_channel_open(self) -> None:
         logger.debug(color('<<< L2CAP channel open', 'magenta'))
-        self.emit('open')
+        self.emit(self.EVENT_OPEN)
 
-    def on_l2cap_channel_close(self):
+    def on_l2cap_channel_close(self) -> None:
         logger.debug(color('<<< L2CAP channel close', 'magenta'))
-        self.emit('close')
+        self.emit(self.EVENT_CLOSE)
 
     def send_message(self, transaction_label: int, message: Message) -> None:
         logger.debug(
@@ -1542,28 +1552,34 @@ class Protocol(EventEmitter):
     async def abort(self, seid: int) -> Abort_Response:
         return await self.send_command(Abort_Command(seid))
 
-    def on_discover_command(self, _command):
+    def on_discover_command(self, command: Discover_Command) -> Optional[Message]:
         endpoint_infos = [
             EndPointInfo(endpoint.seid, 0, endpoint.media_type, endpoint.tsep)
             for endpoint in self.local_endpoints
         ]
         return Discover_Response(endpoint_infos)
 
-    def on_get_capabilities_command(self, command):
+    def on_get_capabilities_command(
+        self, command: Get_Capabilities_Command
+    ) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Get_Capabilities_Reject(AVDTP_BAD_ACP_SEID_ERROR)
 
         return Get_Capabilities_Response(endpoint.capabilities)
 
-    def on_get_all_capabilities_command(self, command):
+    def on_get_all_capabilities_command(
+        self, command: Get_All_Capabilities_Command
+    ) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Get_All_Capabilities_Reject(AVDTP_BAD_ACP_SEID_ERROR)
 
         return Get_All_Capabilities_Response(endpoint.capabilities)
 
-    def on_set_configuration_command(self, command):
+    def on_set_configuration_command(
+        self, command: Set_Configuration_Command
+    ) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Set_Configuration_Reject(AVDTP_BAD_ACP_SEID_ERROR)
@@ -1579,7 +1595,9 @@ class Protocol(EventEmitter):
         result = stream.on_set_configuration_command(command.capabilities)
         return result or Set_Configuration_Response()
 
-    def on_get_configuration_command(self, command):
+    def on_get_configuration_command(
+        self, command: Get_Configuration_Command
+    ) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Get_Configuration_Reject(AVDTP_BAD_ACP_SEID_ERROR)
@@ -1588,7 +1606,7 @@ class Protocol(EventEmitter):
 
         return endpoint.stream.on_get_configuration_command()
 
-    def on_reconfigure_command(self, command):
+    def on_reconfigure_command(self, command: Reconfigure_Command) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Reconfigure_Reject(0, AVDTP_BAD_ACP_SEID_ERROR)
@@ -1598,7 +1616,7 @@ class Protocol(EventEmitter):
         result = endpoint.stream.on_reconfigure_command(command.capabilities)
         return result or Reconfigure_Response()
 
-    def on_open_command(self, command):
+    def on_open_command(self, command: Open_Command) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Open_Reject(AVDTP_BAD_ACP_SEID_ERROR)
@@ -1608,25 +1626,26 @@ class Protocol(EventEmitter):
         result = endpoint.stream.on_open_command()
         return result or Open_Response()
 
-    def on_start_command(self, command):
+    def on_start_command(self, command: Start_Command) -> Optional[Message]:
         for seid in command.acp_seids:
             endpoint = self.get_local_endpoint_by_seid(seid)
             if endpoint is None:
                 return Start_Reject(seid, AVDTP_BAD_ACP_SEID_ERROR)
             if endpoint.stream is None:
-                return Start_Reject(AVDTP_BAD_STATE_ERROR)
+                return Start_Reject(seid, AVDTP_BAD_STATE_ERROR)
 
         # Start all streams
         # TODO: deal with partial failures
         for seid in command.acp_seids:
             endpoint = self.get_local_endpoint_by_seid(seid)
-            result = endpoint.stream.on_start_command()
+            if not endpoint or not endpoint.stream:
-            if result is not None:
+                raise InvalidStateError("Should already be checked!")
+            if (result := endpoint.stream.on_start_command()) is not None:
                 return result
 
         return Start_Response()
 
-    def on_suspend_command(self, command):
+    def on_suspend_command(self, command: Suspend_Command) -> Optional[Message]:
         for seid in command.acp_seids:
             endpoint = self.get_local_endpoint_by_seid(seid)
             if endpoint is None:
@@ -1638,13 +1657,14 @@ class Protocol(EventEmitter):
         # TODO: deal with partial failures
         for seid in command.acp_seids:
             endpoint = self.get_local_endpoint_by_seid(seid)
-            result = endpoint.stream.on_suspend_command()
+            if not endpoint or not endpoint.stream:
-            if result is not None:
+                raise InvalidStateError("Should already be checked!")
+            if (result := endpoint.stream.on_suspend_command()) is not None:
                 return result
 
         return Suspend_Response()
 
-    def on_close_command(self, command):
+    def on_close_command(self, command: Close_Command) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Close_Reject(AVDTP_BAD_ACP_SEID_ERROR)
@@ -1654,7 +1674,7 @@ class Protocol(EventEmitter):
         result = endpoint.stream.on_close_command()
         return result or Close_Response()
 
-    def on_abort_command(self, command):
+    def on_abort_command(self, command: Abort_Command) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None or endpoint.stream is None:
             return Abort_Response()
@@ -1662,15 +1682,17 @@ class Protocol(EventEmitter):
         endpoint.stream.on_abort_command()
         return Abort_Response()
 
-    def on_security_control_command(self, command):
+    def on_security_control_command(
+        self, command: Security_Control_Command
+    ) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return Security_Control_Reject(AVDTP_BAD_ACP_SEID_ERROR)
 
-        result = endpoint.on_security_control_command(command.payload)
+        result = endpoint.on_security_control_command(command.data)
         return result or Security_Control_Response()
 
-    def on_delayreport_command(self, command):
+    def on_delayreport_command(self, command: DelayReport_Command) -> Optional[Message]:
         endpoint = self.get_local_endpoint_by_seid(command.acp_seid)
         if endpoint is None:
             return DelayReport_Reject(AVDTP_BAD_ACP_SEID_ERROR)
@@ -1680,9 +1702,11 @@ class Protocol(EventEmitter):
 
 
 # -----------------------------------------------------------------------------
-class Listener(EventEmitter):
+class Listener(utils.EventEmitter):
     servers: Dict[int, Protocol]
 
+    EVENT_CONNECTION = "connection"
+
     @staticmethod
     def create_registrar(device: device.Device):
         warnings.warn("Please use Listener.for_device()", DeprecationWarning)
@@ -1717,7 +1741,7 @@ class Listener(EventEmitter):
         l2cap_server = device.create_l2cap_server(
             spec=l2cap.ClassicChannelSpec(psm=AVDTP_PSM)
         )
-        l2cap_server.on('connection', listener.on_l2cap_connection)
+        l2cap_server.on(l2cap_server.EVENT_CONNECTION, listener.on_l2cap_connection)
         return listener
 
     def on_l2cap_connection(self, channel: l2cap.ClassicChannel) -> None:
@@ -1733,14 +1757,14 @@ class Listener(EventEmitter):
                 logger.debug('setting up new Protocol for the connection')
                 server = Protocol(channel, self.version)
                 self.set_server(channel.connection, server)
-                self.emit('connection', server)
+                self.emit(self.EVENT_CONNECTION, server)
 
             def on_channel_close():
                 logger.debug('removing Protocol for the connection')
                 self.remove_server(channel.connection)
 
-            channel.on('open', on_channel_open)
+            channel.on(channel.EVENT_OPEN, on_channel_open)
-            channel.on('close', on_channel_close)
+            channel.on(channel.EVENT_CLOSE, on_channel_close)
 
 
 # -----------------------------------------------------------------------------
@@ -1789,6 +1813,7 @@ class Stream:
         )
 
     async def start(self) -> None:
+        """[Source] Start streaming."""
         # Auto-open if needed
         if self.state == AVDTP_CONFIGURED_STATE:
             await self.open()
@@ -1805,6 +1830,7 @@ class Stream:
         self.change_state(AVDTP_STREAMING_STATE)
 
     async def stop(self) -> None:
+        """[Source] Stop streaming and transit to OPEN state."""
         if self.state != AVDTP_STREAMING_STATE:
             raise InvalidStateError('current state is not STREAMING')
 
@@ -1817,6 +1843,7 @@ class Stream:
         self.change_state(AVDTP_OPEN_STATE)
 
     async def close(self) -> None:
+        """[Source] Close channel and transit to IDLE state."""
         if self.state not in (AVDTP_OPEN_STATE, AVDTP_STREAMING_STATE):
             raise InvalidStateError('current state is not OPEN or STREAMING')
 
@@ -1848,7 +1875,7 @@ class Stream:
         self.change_state(AVDTP_CONFIGURED_STATE)
         return None
 
-    def on_get_configuration_command(self, configuration):
+    def on_get_configuration_command(self):
         if self.state not in (
             AVDTP_CONFIGURED_STATE,
             AVDTP_OPEN_STATE,
@@ -1856,7 +1883,7 @@ class Stream:
         ):
             return Get_Configuration_Reject(AVDTP_BAD_STATE_ERROR)
 
-        return self.local_endpoint.on_get_configuration_command(configuration)
+        return self.local_endpoint.on_get_configuration_command()
 
     def on_reconfigure_command(self, configuration):
         if self.state != AVDTP_OPEN_STATE:
@@ -1936,20 +1963,20 @@ class Stream:
             # Wait for the RTP channel to be closed
             self.change_state(AVDTP_ABORTING_STATE)
 
-    def on_l2cap_connection(self, channel):
+    def on_l2cap_connection(self, channel: l2cap.ClassicChannel) -> None:
         logger.debug(color('<<< stream channel connected', 'magenta'))
         self.rtp_channel = channel
-        channel.on('open', self.on_l2cap_channel_open)
+        channel.on(channel.EVENT_OPEN, self.on_l2cap_channel_open)
-        channel.on('close', self.on_l2cap_channel_close)
+        channel.on(channel.EVENT_CLOSE, self.on_l2cap_channel_close)
 
         # We don't need more channels
         self.protocol.channel_acceptor = None
 
-    def on_l2cap_channel_open(self):
+    def on_l2cap_channel_open(self) -> None:
         logger.debug(color('<<< stream channel open', 'magenta'))
         self.local_endpoint.on_rtp_channel_open()
 
-    def on_l2cap_channel_close(self):
+    def on_l2cap_channel_close(self) -> None:
         logger.debug(color('<<< stream channel closed', 'magenta'))
         self.local_endpoint.on_rtp_channel_close()
         self.local_endpoint.in_use = 0
@@ -2063,9 +2090,22 @@ class DiscoveredStreamEndPoint(StreamEndPoint, StreamEndPointProxy):
 
 
 # -----------------------------------------------------------------------------
-class LocalStreamEndPoint(StreamEndPoint, EventEmitter):
+class LocalStreamEndPoint(StreamEndPoint, utils.EventEmitter):
     stream: Optional[Stream]
 
+    EVENT_CONFIGURATION = "configuration"
+    EVENT_OPEN = "open"
+    EVENT_START = "start"
+    EVENT_STOP = "stop"
+    EVENT_RTP_PACKET = "rtp_packet"
+    EVENT_SUSPEND = "suspend"
+    EVENT_CLOSE = "close"
+    EVENT_ABORT = "abort"
+    EVENT_DELAY_REPORT = "delay_report"
+    EVENT_SECURITY_CONTROL = "security_control"
+    EVENT_RTP_CHANNEL_OPEN = "rtp_channel_open"
+    EVENT_RTP_CHANNEL_CLOSE = "rtp_channel_close"
+
     def __init__(
         self,
         protocol: Protocol,
@@ -2076,57 +2116,70 @@ class LocalStreamEndPoint(StreamEndPoint, EventEmitter):
         configuration: Optional[Iterable[ServiceCapabilities]] = None,
     ):
         StreamEndPoint.__init__(self, seid, media_type, tsep, 0, capabilities)
-        EventEmitter.__init__(self)
+        utils.EventEmitter.__init__(self)
         self.protocol = protocol
         self.configuration = configuration if configuration is not None else []
         self.stream = None
 
-    async def start(self):
+    async def start(self) -> None:
-        pass
+        """[Source Only] Handles when receiving start command."""
 
-    async def stop(self):
+    async def stop(self) -> None:
-        pass
+        """[Source Only] Handles when receiving stop command."""
 
-    async def close(self):
+    async def close(self) -> None:
-        pass
+        """[Source Only] Handles when receiving close command."""
 
-    def on_reconfigure_command(self, command):
+    def on_reconfigure_command(self, command) -> Optional[Message]:
-        pass
+        return None
 
-    def on_set_configuration_command(self, configuration):
+    def on_set_configuration_command(self, configuration) -> Optional[Message]:
         logger.debug(
             '<<< received configuration: '
             f'{",".join([str(capability) for capability in configuration])}'
         )
         self.configuration = configuration
-        self.emit('configuration')
+        self.emit(self.EVENT_CONFIGURATION)
+        return None
 
-    def on_get_configuration_command(self):
+    def on_get_configuration_command(self) -> Optional[Message]:
         return Get_Configuration_Response(self.configuration)
 
-    def on_open_command(self):
+    def on_open_command(self) -> Optional[Message]:
-        self.emit('open')
+        self.emit(self.EVENT_OPEN)
+        return None
 
-    def on_start_command(self):
+    def on_start_command(self) -> Optional[Message]:
-        self.emit('start')
+        self.emit(self.EVENT_START)
+        return None
 
-    def on_suspend_command(self):
+    def on_suspend_command(self) -> Optional[Message]:
-        self.emit('suspend')
+        self.emit(self.EVENT_SUSPEND)
+        return None
 
-    def on_close_command(self):
+    def on_close_command(self) -> Optional[Message]:
-        self.emit('close')
+        self.emit(self.EVENT_CLOSE)
+        return None
 
-    def on_abort_command(self):
+    def on_abort_command(self) -> Optional[Message]:
-        self.emit('abort')
+        self.emit(self.EVENT_ABORT)
+        return None
 
-    def on_delayreport_command(self, delay: int):
+    def on_delayreport_command(self, delay: int) -> Optional[Message]:
-        self.emit('delay_report', delay)
+        self.emit(self.EVENT_DELAY_REPORT, delay)
+        return None
 
-    def on_rtp_channel_open(self):
+    def on_security_control_command(self, data: bytes) -> Optional[Message]:
-        self.emit('rtp_channel_open')
+        self.emit(self.EVENT_SECURITY_CONTROL, data)
+        return None
 
-    def on_rtp_channel_close(self):
+    def on_rtp_channel_open(self) -> None:
-        self.emit('rtp_channel_close')
+        self.emit(self.EVENT_RTP_CHANNEL_OPEN)
+        return None
+
+    def on_rtp_channel_close(self) -> None:
+        self.emit(self.EVENT_RTP_CHANNEL_CLOSE)
+        return None
 
 
 # -----------------------------------------------------------------------------
@@ -2157,13 +2210,13 @@ class LocalSource(LocalStreamEndPoint):
         if self.packet_pump and self.stream and self.stream.rtp_channel:
             return await self.packet_pump.start(self.stream.rtp_channel)
 
-        self.emit('start')
+        self.emit(self.EVENT_START)
 
     async def stop(self) -> None:
         if self.packet_pump:
             return await self.packet_pump.stop()
 
-        self.emit('stop')
+        self.emit(self.EVENT_STOP)
 
     def on_start_command(self):
         asyncio.create_task(self.start())
@@ -2204,4 +2257,4 @@ class LocalSink(LocalStreamEndPoint):
             f'{color("<<< RTP Packet:", "green")} '
             f'{rtp_packet} {rtp_packet.payload[:16].hex()}'
         )
-        self.emit('rtp_packet', rtp_packet)
+        self.emit(self.EVENT_RTP_PACKET, rtp_packet)

bumble/avrcp.py

@@ -38,7 +38,6 @@ from typing import (
     Union,
 )
 
-import pyee
 
 from bumble.colors import color
 from bumble.device import Device, Connection
@@ -53,7 +52,7 @@ from bumble.sdp import (
     DataElement,
     ServiceAttribute,
 )
-from bumble.utils import AsyncRunner, OpenIntEnum
+from bumble import utils
 from bumble.core import (
     InvalidArgumentError,
     ProtocolError,
@@ -307,7 +306,7 @@ class Command:
 
 # -----------------------------------------------------------------------------
 class GetCapabilitiesCommand(Command):
-    class CapabilityId(OpenIntEnum):
+    class CapabilityId(utils.OpenIntEnum):
         COMPANY_ID = 0x02
         EVENTS_SUPPORTED = 0x03
 
@@ -637,7 +636,7 @@ class RegisterNotificationResponse(Response):
 
 
 # -----------------------------------------------------------------------------
-class EventId(OpenIntEnum):
+class EventId(utils.OpenIntEnum):
     PLAYBACK_STATUS_CHANGED = 0x01
     TRACK_CHANGED = 0x02
     TRACK_REACHED_END = 0x03
@@ -657,12 +656,12 @@ class EventId(OpenIntEnum):
 
 
 # -----------------------------------------------------------------------------
-class CharacterSetId(OpenIntEnum):
+class CharacterSetId(utils.OpenIntEnum):
     UTF_8 = 0x06
 
 
 # -----------------------------------------------------------------------------
-class MediaAttributeId(OpenIntEnum):
+class MediaAttributeId(utils.OpenIntEnum):
     TITLE = 0x01
     ARTIST_NAME = 0x02
     ALBUM_NAME = 0x03
@@ -682,7 +681,7 @@ class MediaAttribute:
 
 
 # -----------------------------------------------------------------------------
-class PlayStatus(OpenIntEnum):
+class PlayStatus(utils.OpenIntEnum):
     STOPPED = 0x00
     PLAYING = 0x01
     PAUSED = 0x02
@@ -701,33 +700,33 @@ class SongAndPlayStatus:
 
 # -----------------------------------------------------------------------------
 class ApplicationSetting:
-    class AttributeId(OpenIntEnum):
+    class AttributeId(utils.OpenIntEnum):
         EQUALIZER_ON_OFF = 0x01
         REPEAT_MODE = 0x02
         SHUFFLE_ON_OFF = 0x03
         SCAN_ON_OFF = 0x04
 
-    class EqualizerOnOffStatus(OpenIntEnum):
+    class EqualizerOnOffStatus(utils.OpenIntEnum):
         OFF = 0x01
         ON = 0x02
 
-    class RepeatModeStatus(OpenIntEnum):
+    class RepeatModeStatus(utils.OpenIntEnum):
         OFF = 0x01
         SINGLE_TRACK_REPEAT = 0x02
         ALL_TRACK_REPEAT = 0x03
         GROUP_REPEAT = 0x04
 
-    class ShuffleOnOffStatus(OpenIntEnum):
+    class ShuffleOnOffStatus(utils.OpenIntEnum):
         OFF = 0x01
         ALL_TRACKS_SHUFFLE = 0x02
         GROUP_SHUFFLE = 0x03
 
-    class ScanOnOffStatus(OpenIntEnum):
+    class ScanOnOffStatus(utils.OpenIntEnum):
         OFF = 0x01
         ALL_TRACKS_SCAN = 0x02
         GROUP_SCAN = 0x03
 
-    class GenericValue(OpenIntEnum):
+    class GenericValue(utils.OpenIntEnum):
         pass
 
 
@@ -816,7 +815,7 @@ class PlayerApplicationSettingChangedEvent(Event):
     @dataclass
     class Setting:
         attribute_id: ApplicationSetting.AttributeId
-        value_id: OpenIntEnum
+        value_id: utils.OpenIntEnum
 
     player_application_settings: List[Setting]
 
@@ -824,7 +823,7 @@ class PlayerApplicationSettingChangedEvent(Event):
     def from_bytes(cls, pdu: bytes) -> PlayerApplicationSettingChangedEvent:
         def setting(attribute_id_int: int, value_id_int: int):
             attribute_id = ApplicationSetting.AttributeId(attribute_id_int)
-            value_id: OpenIntEnum
+            value_id: utils.OpenIntEnum
             if attribute_id == ApplicationSetting.AttributeId.EQUALIZER_ON_OFF:
                 value_id = ApplicationSetting.EqualizerOnOffStatus(value_id_int)
             elif attribute_id == ApplicationSetting.AttributeId.REPEAT_MODE:
@@ -994,16 +993,20 @@ class Delegate:
 
 
 # -----------------------------------------------------------------------------
-class Protocol(pyee.EventEmitter):
+class Protocol(utils.EventEmitter):
     """AVRCP Controller and Target protocol."""
 
+    EVENT_CONNECTION = "connection"
+    EVENT_START = "start"
+    EVENT_STOP = "stop"
+
     class PacketType(enum.IntEnum):
         SINGLE = 0b00
         START = 0b01
         CONTINUE = 0b10
         END = 0b11
 
-    class PduId(OpenIntEnum):
+    class PduId(utils.OpenIntEnum):
         GET_CAPABILITIES = 0x10
         LIST_PLAYER_APPLICATION_SETTING_ATTRIBUTES = 0x11
         LIST_PLAYER_APPLICATION_SETTING_VALUES = 0x12
@@ -1024,7 +1027,7 @@ class Protocol(pyee.EventEmitter):
         GET_FOLDER_ITEMS = 0x71
         GET_TOTAL_NUMBER_OF_ITEMS = 0x75
 
-    class StatusCode(OpenIntEnum):
+    class StatusCode(utils.OpenIntEnum):
         INVALID_COMMAND = 0x00
         INVALID_PARAMETER = 0x01
         PARAMETER_CONTENT_ERROR = 0x02
@@ -1457,16 +1460,18 @@ class Protocol(pyee.EventEmitter):
 
     def _on_avctp_connection(self, l2cap_channel: l2cap.ClassicChannel) -> None:
         logger.debug("AVCTP connection established")
-        l2cap_channel.on("open", lambda: self._on_avctp_channel_open(l2cap_channel))
+        l2cap_channel.on(
+            l2cap_channel.EVENT_OPEN, lambda: self._on_avctp_channel_open(l2cap_channel)
+        )
 
-        self.emit("connection")
+        self.emit(self.EVENT_CONNECTION)
 
     def _on_avctp_channel_open(self, l2cap_channel: l2cap.ClassicChannel) -> None:
         logger.debug("AVCTP channel open")
         if self.avctp_protocol is not None:
             # TODO: find a better strategy instead of just closing
             logger.warning("AVCTP protocol already active, closing connection")
-            AsyncRunner.spawn(l2cap_channel.disconnect())
+            utils.AsyncRunner.spawn(l2cap_channel.disconnect())
             return
 
         self.avctp_protocol = avctp.Protocol(l2cap_channel)
@@ -1474,15 +1479,15 @@ class Protocol(pyee.EventEmitter):
         self.avctp_protocol.register_response_handler(
             AVRCP_PID, self._on_avctp_response
         )
-        l2cap_channel.on("close", self._on_avctp_channel_close)
+        l2cap_channel.on(l2cap_channel.EVENT_CLOSE, self._on_avctp_channel_close)
 
-        self.emit("start")
+        self.emit(self.EVENT_START)
 
     def _on_avctp_channel_close(self) -> None:
         logger.debug("AVCTP channel closed")
         self.avctp_protocol = None
 
-        self.emit("stop")
+        self.emit(self.EVENT_STOP)
 
     def _on_avctp_command(
         self, transaction_label: int, command: avc.CommandFrame

bumble/bridge.py

@@ -17,8 +17,8 @@
 # -----------------------------------------------------------------------------
 import logging
 
-from .hci import HCI_Packet
+from bumble.hci import HCI_Packet
-from .helpers import PacketTracer
+from bumble.helpers import PacketTracer
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/controller.py

@@ -25,10 +25,7 @@ import random
 import struct
 from bumble.colors import color
 from bumble.core import (
-    BT_CENTRAL_ROLE,
+    PhysicalTransport,
-    BT_PERIPHERAL_ROLE,
-    BT_LE_TRANSPORT,
-    BT_BR_EDR_TRANSPORT,
 )
 
 from bumble.hci import (
@@ -47,6 +44,7 @@ from bumble.hci import (
     HCI_REMOTE_USER_TERMINATED_CONNECTION_ERROR,
     HCI_VERSION_BLUETOOTH_CORE_5_0,
     Address,
+    Role,
     HCI_AclDataPacket,
     HCI_AclDataPacketAssembler,
     HCI_Command_Complete_Event,
@@ -98,7 +96,7 @@ class CisLink:
 class Connection:
     controller: Controller
     handle: int
-    role: int
+    role: Role
     peer_address: Address
     link: Any
     transport: int
@@ -390,10 +388,10 @@ class Controller:
             connection = Connection(
                 controller=self,
                 handle=connection_handle,
-                role=BT_PERIPHERAL_ROLE,
+                role=Role.PERIPHERAL,
                 peer_address=peer_address,
                 link=self.link,
-                transport=BT_LE_TRANSPORT,
+                transport=PhysicalTransport.LE,
                 link_type=HCI_Connection_Complete_Event.ACL_LINK_TYPE,
             )
             self.peripheral_connections[peer_address] = connection
@@ -450,10 +448,10 @@ class Controller:
                 connection = Connection(
                     controller=self,
                     handle=connection_handle,
-                    role=BT_CENTRAL_ROLE,
+                    role=Role.CENTRAL,
                     peer_address=peer_address,
                     link=self.link,
-                    transport=BT_LE_TRANSPORT,
+                    transport=PhysicalTransport.LE,
                     link_type=HCI_Connection_Complete_Event.ACL_LINK_TYPE,
                 )
                 self.central_connections[peer_address] = connection
@@ -469,7 +467,7 @@ class Controller:
             HCI_LE_Connection_Complete_Event(
                 status=status,
                 connection_handle=connection.handle if connection else 0,
-                role=BT_CENTRAL_ROLE,
+                role=Role.CENTRAL,
                 peer_address_type=le_create_connection_command.peer_address_type,
                 peer_address=le_create_connection_command.peer_address,
                 connection_interval=le_create_connection_command.connection_interval_min,
@@ -531,7 +529,7 @@ class Controller:
 
     def on_link_acl_data(self, sender_address, transport, data):
         # Look for the connection to which this data belongs
-        if transport == BT_LE_TRANSPORT:
+        if transport == PhysicalTransport.LE:
             connection = self.find_le_connection_by_address(sender_address)
         else:
             connection = self.find_classic_connection_by_address(sender_address)
@@ -693,10 +691,10 @@ class Controller:
                     controller=self,
                     handle=connection_handle,
                     # Role doesn't matter in Classic because they are managed by HCI_Role_Change and HCI_Role_Discovery
-                    role=BT_CENTRAL_ROLE,
+                    role=Role.CENTRAL,
                     peer_address=peer_address,
                     link=self.link,
-                    transport=BT_BR_EDR_TRANSPORT,
+                    transport=PhysicalTransport.BR_EDR,
                     link_type=HCI_Connection_Complete_Event.ACL_LINK_TYPE,
                 )
                 self.classic_connections[peer_address] = connection
@@ -761,10 +759,10 @@ class Controller:
                 controller=self,
                 handle=connection_handle,
                 # Role doesn't matter in SCO.
-                role=BT_CENTRAL_ROLE,
+                role=Role.CENTRAL,
                 peer_address=peer_address,
                 link=self.link,
-                transport=BT_BR_EDR_TRANSPORT,
+                transport=PhysicalTransport.BR_EDR,
                 link_type=link_type,
             )
             self.classic_connections[peer_address] = connection

bumble/core.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2022 Google LLC
+# Copyright 2021-2025 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -16,14 +16,14 @@
 # Imports
 # -----------------------------------------------------------------------------
 from __future__ import annotations
-import dataclasses
+
 import enum
 import struct
-from typing import List, Optional, Tuple, Union, cast, Dict
+from typing import cast, overload, Literal, Union, Optional
 from typing_extensions import Self
 
 from bumble.company_ids import COMPANY_IDENTIFIERS
-from bumble.utils import OpenIntEnum
+from bumble import utils
 
 
 # -----------------------------------------------------------------------------
@@ -31,11 +31,12 @@ from bumble.utils import OpenIntEnum
 # -----------------------------------------------------------------------------
 # fmt: off
 
-BT_CENTRAL_ROLE    = 0
+class PhysicalTransport(enum.IntEnum):
-BT_PERIPHERAL_ROLE = 1
+    BR_EDR = 0
+    LE     = 1
 
-BT_BR_EDR_TRANSPORT = 0
+BT_BR_EDR_TRANSPORT = PhysicalTransport.BR_EDR
-BT_LE_TRANSPORT     = 1
+BT_LE_TRANSPORT     = PhysicalTransport.LE
 
 
 # fmt: on
@@ -57,7 +58,7 @@ def bit_flags_to_strings(bits, bit_flag_names):
     return names
 
 
-def name_or_number(dictionary: Dict[int, str], number: int, width: int = 2) -> str:
+def name_or_number(dictionary: dict[int, str], number: int, width: int = 2) -> str:
     name = dictionary.get(number)
     if name is not None:
         return name
@@ -200,7 +201,7 @@ class UUID:
     '''
 
     BASE_UUID = bytes.fromhex('00001000800000805F9B34FB')[::-1]  # little-endian
-    UUIDS: List[UUID] = []  # Registry of all instances created
+    UUIDS: list[UUID] = []  # Registry of all instances created
 
     uuid_bytes: bytes
     name: Optional[str]
@@ -259,11 +260,11 @@ class UUID:
         return cls.from_bytes(struct.pack('<I', uuid_32), name)
 
     @classmethod
-    def parse_uuid(cls, uuid_as_bytes: bytes, offset: int) -> Tuple[int, UUID]:
+    def parse_uuid(cls, uuid_as_bytes: bytes, offset: int) -> tuple[int, UUID]:
         return len(uuid_as_bytes), cls.from_bytes(uuid_as_bytes[offset:])
 
     @classmethod
-    def parse_uuid_2(cls, uuid_as_bytes: bytes, offset: int) -> Tuple[int, UUID]:
+    def parse_uuid_2(cls, uuid_as_bytes: bytes, offset: int) -> tuple[int, UUID]:
         return offset + 2, cls.from_bytes(uuid_as_bytes[offset : offset + 2])
 
     def to_bytes(self, force_128: bool = False) -> bytes:
@@ -729,7 +730,7 @@ class DeviceClass:
 # Appearance
 # -----------------------------------------------------------------------------
 class Appearance:
-    class Category(OpenIntEnum):
+    class Category(utils.OpenIntEnum):
         UNKNOWN = 0x0000
         PHONE = 0x0001
         COMPUTER = 0x0002
@@ -783,13 +784,13 @@ class Appearance:
         SPIROMETER = 0x0037
         OUTDOOR_SPORTS_ACTIVITY = 0x0051
 
-    class UnknownSubcategory(OpenIntEnum):
+    class UnknownSubcategory(utils.OpenIntEnum):
         GENERIC_UNKNOWN = 0x00
 
-    class PhoneSubcategory(OpenIntEnum):
+    class PhoneSubcategory(utils.OpenIntEnum):
         GENERIC_PHONE = 0x00
 
-    class ComputerSubcategory(OpenIntEnum):
+    class ComputerSubcategory(utils.OpenIntEnum):
         GENERIC_COMPUTER = 0x00
         DESKTOP_WORKSTATION = 0x01
         SERVER_CLASS_COMPUTER = 0x02
@@ -807,49 +808,49 @@ class Appearance:
         MINI_PC = 0x0E
         STICK_PC = 0x0F
 
-    class WatchSubcategory(OpenIntEnum):
+    class WatchSubcategory(utils.OpenIntEnum):
-        GENENERIC_WATCH = 0x00
+        GENERIC_WATCH = 0x00
         SPORTS_WATCH = 0x01
         SMARTWATCH = 0x02
 
-    class ClockSubcategory(OpenIntEnum):
+    class ClockSubcategory(utils.OpenIntEnum):
         GENERIC_CLOCK = 0x00
 
-    class DisplaySubcategory(OpenIntEnum):
+    class DisplaySubcategory(utils.OpenIntEnum):
         GENERIC_DISPLAY = 0x00
 
-    class RemoteControlSubcategory(OpenIntEnum):
+    class RemoteControlSubcategory(utils.OpenIntEnum):
         GENERIC_REMOTE_CONTROL = 0x00
 
-    class EyeglassesSubcategory(OpenIntEnum):
+    class EyeglassesSubcategory(utils.OpenIntEnum):
         GENERIC_EYEGLASSES = 0x00
 
-    class TagSubcategory(OpenIntEnum):
+    class TagSubcategory(utils.OpenIntEnum):
         GENERIC_TAG = 0x00
 
-    class KeyringSubcategory(OpenIntEnum):
+    class KeyringSubcategory(utils.OpenIntEnum):
         GENERIC_KEYRING = 0x00
 
-    class MediaPlayerSubcategory(OpenIntEnum):
+    class MediaPlayerSubcategory(utils.OpenIntEnum):
         GENERIC_MEDIA_PLAYER = 0x00
 
-    class BarcodeScannerSubcategory(OpenIntEnum):
+    class BarcodeScannerSubcategory(utils.OpenIntEnum):
         GENERIC_BARCODE_SCANNER = 0x00
 
-    class ThermometerSubcategory(OpenIntEnum):
+    class ThermometerSubcategory(utils.OpenIntEnum):
         GENERIC_THERMOMETER = 0x00
         EAR_THERMOMETER = 0x01
 
-    class HeartRateSensorSubcategory(OpenIntEnum):
+    class HeartRateSensorSubcategory(utils.OpenIntEnum):
         GENERIC_HEART_RATE_SENSOR = 0x00
         HEART_RATE_BELT = 0x01
 
-    class BloodPressureSubcategory(OpenIntEnum):
+    class BloodPressureSubcategory(utils.OpenIntEnum):
         GENERIC_BLOOD_PRESSURE = 0x00
         ARM_BLOOD_PRESSURE = 0x01
         WRIST_BLOOD_PRESSURE = 0x02
 
-    class HumanInterfaceDeviceSubcategory(OpenIntEnum):
+    class HumanInterfaceDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_HUMAN_INTERFACE_DEVICE = 0x00
         KEYBOARD = 0x01
         MOUSE = 0x02
@@ -862,16 +863,16 @@ class Appearance:
         TOUCHPAD = 0x09
         PRESENTATION_REMOTE = 0x0A
 
-    class GlucoseMeterSubcategory(OpenIntEnum):
+    class GlucoseMeterSubcategory(utils.OpenIntEnum):
         GENERIC_GLUCOSE_METER = 0x00
 
-    class RunningWalkingSensorSubcategory(OpenIntEnum):
+    class RunningWalkingSensorSubcategory(utils.OpenIntEnum):
         GENERIC_RUNNING_WALKING_SENSOR = 0x00
         IN_SHOE_RUNNING_WALKING_SENSOR = 0x01
         ON_SHOW_RUNNING_WALKING_SENSOR = 0x02
         ON_HIP_RUNNING_WALKING_SENSOR = 0x03
 
-    class CyclingSubcategory(OpenIntEnum):
+    class CyclingSubcategory(utils.OpenIntEnum):
         GENERIC_CYCLING = 0x00
         CYCLING_COMPUTER = 0x01
         SPEED_SENSOR = 0x02
@@ -879,7 +880,7 @@ class Appearance:
         POWER_SENSOR = 0x04
         SPEED_AND_CADENCE_SENSOR = 0x05
 
-    class ControlDeviceSubcategory(OpenIntEnum):
+    class ControlDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_CONTROL_DEVICE = 0x00
         SWITCH = 0x01
         MULTI_SWITCH = 0x02
@@ -894,13 +895,13 @@ class Appearance:
         ENERGY_HARVESTING_SWITCH = 0x0B
         PUSH_BUTTON = 0x0C
 
-    class NetworkDeviceSubcategory(OpenIntEnum):
+    class NetworkDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_NETWORK_DEVICE = 0x00
         ACCESS_POINT = 0x01
         MESH_DEVICE = 0x02
         MESH_NETWORK_PROXY = 0x03
 
-    class SensorSubcategory(OpenIntEnum):
+    class SensorSubcategory(utils.OpenIntEnum):
         GENERIC_SENSOR = 0x00
         MOTION_SENSOR = 0x01
         AIR_QUALITY_SENSOR = 0x02
@@ -928,7 +929,7 @@ class Appearance:
         FLAME_DETECTOR = 0x18
         VEHICLE_TIRE_PRESSURE_SENSOR = 0x19
 
-    class LightFixturesSubcategory(OpenIntEnum):
+    class LightFixturesSubcategory(utils.OpenIntEnum):
         GENERIC_LIGHT_FIXTURES = 0x00
         WALL_LIGHT = 0x01
         CEILING_LIGHT = 0x02
@@ -956,7 +957,7 @@ class Appearance:
         LOW_BAY_LIGHT = 0x18
         HIGH_BAY_LIGHT = 0x19
 
-    class FanSubcategory(OpenIntEnum):
+    class FanSubcategory(utils.OpenIntEnum):
         GENERIC_FAN = 0x00
         CEILING_FAN = 0x01
         AXIAL_FAN = 0x02
@@ -965,7 +966,7 @@ class Appearance:
         DESK_FAN = 0x05
         WALL_FAN = 0x06
 
-    class HvacSubcategory(OpenIntEnum):
+    class HvacSubcategory(utils.OpenIntEnum):
         GENERIC_HVAC = 0x00
         THERMOSTAT = 0x01
         HUMIDIFIER = 0x02
@@ -979,13 +980,13 @@ class Appearance:
         FAN_HEATER = 0x0A
         AIR_CURTAIN = 0x0B
 
-    class AirConditioningSubcategory(OpenIntEnum):
+    class AirConditioningSubcategory(utils.OpenIntEnum):
         GENERIC_AIR_CONDITIONING = 0x00
 
-    class HumidifierSubcategory(OpenIntEnum):
+    class HumidifierSubcategory(utils.OpenIntEnum):
         GENERIC_HUMIDIFIER = 0x00
 
-    class HeatingSubcategory(OpenIntEnum):
+    class HeatingSubcategory(utils.OpenIntEnum):
         GENERIC_HEATING = 0x00
         RADIATOR = 0x01
         BOILER = 0x02
@@ -995,7 +996,7 @@ class Appearance:
         FAN_HEATER = 0x06
         AIR_CURTAIN = 0x07
 
-    class AccessControlSubcategory(OpenIntEnum):
+    class AccessControlSubcategory(utils.OpenIntEnum):
         GENERIC_ACCESS_CONTROL = 0x00
         ACCESS_DOOR = 0x01
         GARAGE_DOOR = 0x02
@@ -1007,7 +1008,7 @@ class Appearance:
         DOOR_LOCK = 0x08
         LOCKER = 0x09
 
-    class MotorizedDeviceSubcategory(OpenIntEnum):
+    class MotorizedDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_MOTORIZED_DEVICE = 0x00
         MOTORIZED_GATE = 0x01
         AWNING = 0x02
@@ -1015,7 +1016,7 @@ class Appearance:
         CURTAINS = 0x04
         SCREEN = 0x05
 
-    class PowerDeviceSubcategory(OpenIntEnum):
+    class PowerDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_POWER_DEVICE = 0x00
         POWER_OUTLET = 0x01
         POWER_STRIP = 0x02
@@ -1027,7 +1028,7 @@ class Appearance:
         CHARGE_CASE = 0x08
         POWER_BANK = 0x09
 
-    class LightSourceSubcategory(OpenIntEnum):
+    class LightSourceSubcategory(utils.OpenIntEnum):
         GENERIC_LIGHT_SOURCE = 0x00
         INCANDESCENT_LIGHT_BULB = 0x01
         LED_LAMP = 0x02
@@ -1038,7 +1039,7 @@ class Appearance:
         LOW_VOLTAGE_HALOGEN = 0x07
         ORGANIC_LIGHT_EMITTING_DIODE = 0x08
 
-    class WindowCoveringSubcategory(OpenIntEnum):
+    class WindowCoveringSubcategory(utils.OpenIntEnum):
         GENERIC_WINDOW_COVERING = 0x00
         WINDOW_SHADES = 0x01
         WINDOW_BLINDS = 0x02
@@ -1047,7 +1048,7 @@ class Appearance:
         EXTERIOR_SHUTTER = 0x05
         EXTERIOR_SCREEN = 0x06
 
-    class AudioSinkSubcategory(OpenIntEnum):
+    class AudioSinkSubcategory(utils.OpenIntEnum):
         GENERIC_AUDIO_SINK = 0x00
         STANDALONE_SPEAKER = 0x01
         SOUNDBAR = 0x02
@@ -1055,7 +1056,7 @@ class Appearance:
         STANDMOUNTED_SPEAKER = 0x04
         SPEAKERPHONE = 0x05
 
-    class AudioSourceSubcategory(OpenIntEnum):
+    class AudioSourceSubcategory(utils.OpenIntEnum):
         GENERIC_AUDIO_SOURCE = 0x00
         MICROPHONE = 0x01
         ALARM = 0x02
@@ -1067,7 +1068,7 @@ class Appearance:
         BROADCASTING_ROOM = 0x08
         AUDITORIUM = 0x09
 
-    class MotorizedVehicleSubcategory(OpenIntEnum):
+    class MotorizedVehicleSubcategory(utils.OpenIntEnum):
         GENERIC_MOTORIZED_VEHICLE = 0x00
         CAR = 0x01
         LARGE_GOODS_VEHICLE = 0x02
@@ -1085,7 +1086,7 @@ class Appearance:
         CAMPER_CARAVAN = 0x0E
         RECREATIONAL_VEHICLE_MOTOR_HOME = 0x0F
 
-    class DomesticApplianceSubcategory(OpenIntEnum):
+    class DomesticApplianceSubcategory(utils.OpenIntEnum):
         GENERIC_DOMESTIC_APPLIANCE = 0x00
         REFRIGERATOR = 0x01
         FREEZER = 0x02
@@ -1103,21 +1104,21 @@ class Appearance:
         RICE_COOKER = 0x0E
         CLOTHES_STEAMER = 0x0F
 
-    class WearableAudioDeviceSubcategory(OpenIntEnum):
+    class WearableAudioDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_WEARABLE_AUDIO_DEVICE = 0x00
         EARBUD = 0x01
         HEADSET = 0x02
         HEADPHONES = 0x03
         NECK_BAND = 0x04
 
-    class AircraftSubcategory(OpenIntEnum):
+    class AircraftSubcategory(utils.OpenIntEnum):
         GENERIC_AIRCRAFT = 0x00
         LIGHT_AIRCRAFT = 0x01
         MICROLIGHT = 0x02
         PARAGLIDER = 0x03
         LARGE_PASSENGER_AIRCRAFT = 0x04
 
-    class AvEquipmentSubcategory(OpenIntEnum):
+    class AvEquipmentSubcategory(utils.OpenIntEnum):
         GENERIC_AV_EQUIPMENT = 0x00
         AMPLIFIER = 0x01
         RECEIVER = 0x02
@@ -1126,69 +1127,69 @@ class Appearance:
         TURNTABLE = 0x05
         CD_PLAYER = 0x06
         DVD_PLAYER = 0x07
-        BLUERAY_PLAYER = 0x08
+        BLURAY_PLAYER = 0x08
         OPTICAL_DISC_PLAYER = 0x09
         SET_TOP_BOX = 0x0A
 
-    class DisplayEquipmentSubcategory(OpenIntEnum):
+    class DisplayEquipmentSubcategory(utils.OpenIntEnum):
         GENERIC_DISPLAY_EQUIPMENT = 0x00
         TELEVISION = 0x01
         MONITOR = 0x02
         PROJECTOR = 0x03
 
-    class HearingAidSubcategory(OpenIntEnum):
+    class HearingAidSubcategory(utils.OpenIntEnum):
         GENERIC_HEARING_AID = 0x00
         IN_EAR_HEARING_AID = 0x01
         BEHIND_EAR_HEARING_AID = 0x02
         COCHLEAR_IMPLANT = 0x03
 
-    class GamingSubcategory(OpenIntEnum):
+    class GamingSubcategory(utils.OpenIntEnum):
         GENERIC_GAMING = 0x00
         HOME_VIDEO_GAME_CONSOLE = 0x01
         PORTABLE_HANDHELD_CONSOLE = 0x02
 
-    class SignageSubcategory(OpenIntEnum):
+    class SignageSubcategory(utils.OpenIntEnum):
         GENERIC_SIGNAGE = 0x00
         DIGITAL_SIGNAGE = 0x01
         ELECTRONIC_LABEL = 0x02
 
-    class PulseOximeterSubcategory(OpenIntEnum):
+    class PulseOximeterSubcategory(utils.OpenIntEnum):
         GENERIC_PULSE_OXIMETER = 0x00
         FINGERTIP_PULSE_OXIMETER = 0x01
         WRIST_WORN_PULSE_OXIMETER = 0x02
 
-    class WeightScaleSubcategory(OpenIntEnum):
+    class WeightScaleSubcategory(utils.OpenIntEnum):
         GENERIC_WEIGHT_SCALE = 0x00
 
-    class PersonalMobilityDeviceSubcategory(OpenIntEnum):
+    class PersonalMobilityDeviceSubcategory(utils.OpenIntEnum):
         GENERIC_PERSONAL_MOBILITY_DEVICE = 0x00
         POWERED_WHEELCHAIR = 0x01
         MOBILITY_SCOOTER = 0x02
 
-    class ContinuousGlucoseMonitorSubcategory(OpenIntEnum):
+    class ContinuousGlucoseMonitorSubcategory(utils.OpenIntEnum):
         GENERIC_CONTINUOUS_GLUCOSE_MONITOR = 0x00
 
-    class InsulinPumpSubcategory(OpenIntEnum):
+    class InsulinPumpSubcategory(utils.OpenIntEnum):
         GENERIC_INSULIN_PUMP = 0x00
         INSULIN_PUMP_DURABLE_PUMP = 0x01
         INSULIN_PUMP_PATCH_PUMP = 0x02
         INSULIN_PEN = 0x03
 
-    class MedicationDeliverySubcategory(OpenIntEnum):
+    class MedicationDeliverySubcategory(utils.OpenIntEnum):
         GENERIC_MEDICATION_DELIVERY = 0x00
 
-    class SpirometerSubcategory(OpenIntEnum):
+    class SpirometerSubcategory(utils.OpenIntEnum):
         GENERIC_SPIROMETER = 0x00
         HANDHELD_SPIROMETER = 0x01
 
-    class OutdoorSportsActivitySubcategory(OpenIntEnum):
+    class OutdoorSportsActivitySubcategory(utils.OpenIntEnum):
         GENERIC_OUTDOOR_SPORTS_ACTIVITY = 0x00
         LOCATION_DISPLAY = 0x01
         LOCATION_AND_NAVIGATION_DISPLAY = 0x02
         LOCATION_POD = 0x03
         LOCATION_AND_NAVIGATION_POD = 0x04
 
-    class _OpenSubcategory(OpenIntEnum):
+    class _OpenSubcategory(utils.OpenIntEnum):
         GENERIC = 0x00
 
     SUBCATEGORY_CLASSES = {
@@ -1280,13 +1281,13 @@ class Appearance:
 # Advertising Data
 # -----------------------------------------------------------------------------
 AdvertisingDataObject = Union[
-    List[UUID],
+    list[UUID],
-    Tuple[UUID, bytes],
+    tuple[UUID, bytes],
     bytes,
     str,
     int,
-    Tuple[int, int],
+    tuple[int, int],
-    Tuple[int, bytes],
+    tuple[int, bytes],
     Appearance,
 ]
 
@@ -1295,129 +1296,135 @@ class AdvertisingData:
     # fmt: off
     # pylint: disable=line-too-long
 
-    FLAGS                                            = 0x01
+    class Type(utils.OpenIntEnum):
-    INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS    = 0x02
+        FLAGS                                               = 0x01
-    COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS      = 0x03
+        INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS       = 0x02
-    INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS    = 0x04
+        COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS         = 0x03
-    COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS      = 0x05
+        INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS       = 0x04
-    INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS   = 0x06
+        COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS         = 0x05
-    COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS     = 0x07
+        INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS      = 0x06
-    SHORTENED_LOCAL_NAME                             = 0x08
+        COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS        = 0x07
-    COMPLETE_LOCAL_NAME                              = 0x09
+        SHORTENED_LOCAL_NAME                                = 0x08
-    TX_POWER_LEVEL                                   = 0x0A
+        COMPLETE_LOCAL_NAME                                 = 0x09
-    CLASS_OF_DEVICE                                  = 0x0D
+        TX_POWER_LEVEL                                      = 0x0A
-    SIMPLE_PAIRING_HASH_C                            = 0x0E
+        CLASS_OF_DEVICE                                     = 0x0D
-    SIMPLE_PAIRING_HASH_C_192                        = 0x0E
+        SIMPLE_PAIRING_HASH_C                               = 0x0E
-    SIMPLE_PAIRING_RANDOMIZER_R                      = 0x0F
+        SIMPLE_PAIRING_HASH_C_192                           = 0x0E
-    SIMPLE_PAIRING_RANDOMIZER_R_192                  = 0x0F
+        SIMPLE_PAIRING_RANDOMIZER_R                         = 0x0F
-    DEVICE_ID                                        = 0x10
+        SIMPLE_PAIRING_RANDOMIZER_R_192                     = 0x0F
-    SECURITY_MANAGER_TK_VALUE                        = 0x10
+        DEVICE_ID                                           = 0x10
-    SECURITY_MANAGER_OUT_OF_BAND_FLAGS               = 0x11
+        SECURITY_MANAGER_TK_VALUE                           = 0x10
-    PERIPHERAL_CONNECTION_INTERVAL_RANGE             = 0x12
+        SECURITY_MANAGER_OUT_OF_BAND_FLAGS                  = 0x11
-    LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS        = 0x14
+        PERIPHERAL_CONNECTION_INTERVAL_RANGE                = 0x12
-    LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS       = 0x15
+        LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS           = 0x14
-    SERVICE_DATA                                     = 0x16
+        LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS          = 0x15
-    SERVICE_DATA_16_BIT_UUID                         = 0x16
+        SERVICE_DATA_16_BIT_UUID                            = 0x16
-    PUBLIC_TARGET_ADDRESS                            = 0x17
+        PUBLIC_TARGET_ADDRESS                               = 0x17
-    RANDOM_TARGET_ADDRESS                            = 0x18
+        RANDOM_TARGET_ADDRESS                               = 0x18
-    APPEARANCE                                       = 0x19
+        APPEARANCE                                          = 0x19
-    ADVERTISING_INTERVAL                             = 0x1A
+        ADVERTISING_INTERVAL                                = 0x1A
-    LE_BLUETOOTH_DEVICE_ADDRESS                      = 0x1B
+        LE_BLUETOOTH_DEVICE_ADDRESS                         = 0x1B
-    LE_ROLE                                          = 0x1C
+        LE_ROLE                                             = 0x1C
-    SIMPLE_PAIRING_HASH_C_256                        = 0x1D
+        SIMPLE_PAIRING_HASH_C_256                           = 0x1D
-    SIMPLE_PAIRING_RANDOMIZER_R_256                  = 0x1E
+        SIMPLE_PAIRING_RANDOMIZER_R_256                     = 0x1E
-    LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS        = 0x1F
+        LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS           = 0x1F
-    SERVICE_DATA_32_BIT_UUID                         = 0x20
+        SERVICE_DATA_32_BIT_UUID                            = 0x20
-    SERVICE_DATA_128_BIT_UUID                        = 0x21
+        SERVICE_DATA_128_BIT_UUID                           = 0x21
-    LE_SECURE_CONNECTIONS_CONFIRMATION_VALUE         = 0x22
+        LE_SECURE_CONNECTIONS_CONFIRMATION_VALUE            = 0x22
-    LE_SECURE_CONNECTIONS_RANDOM_VALUE               = 0x23
+        LE_SECURE_CONNECTIONS_RANDOM_VALUE                  = 0x23
-    URI                                              = 0x24
+        URI                                                 = 0x24
-    INDOOR_POSITIONING                               = 0x25
+        INDOOR_POSITIONING                                  = 0x25
-    TRANSPORT_DISCOVERY_DATA                         = 0x26
+        TRANSPORT_DISCOVERY_DATA                            = 0x26
-    LE_SUPPORTED_FEATURES                            = 0x27
+        LE_SUPPORTED_FEATURES                               = 0x27
-    CHANNEL_MAP_UPDATE_INDICATION                    = 0x28
+        CHANNEL_MAP_UPDATE_INDICATION                       = 0x28
-    PB_ADV                                           = 0x29
+        PB_ADV                                              = 0x29
-    MESH_MESSAGE                                     = 0x2A
+        MESH_MESSAGE                                        = 0x2A
-    MESH_BEACON                                      = 0x2B
+        MESH_BEACON                                         = 0x2B
-    BIGINFO                                          = 0x2C
+        BIGINFO                                             = 0x2C
-    BROADCAST_CODE                                   = 0x2D
+        BROADCAST_CODE                                      = 0x2D
-    RESOLVABLE_SET_IDENTIFIER                        = 0x2E
+        RESOLVABLE_SET_IDENTIFIER                           = 0x2E
-    ADVERTISING_INTERVAL_LONG                        = 0x2F
+        ADVERTISING_INTERVAL_LONG                           = 0x2F
-    BROADCAST_NAME                                   = 0x30
+        BROADCAST_NAME                                      = 0x30
-    ENCRYPTED_ADVERTISING_DATA                       = 0X31
+        ENCRYPTED_ADVERTISING_DATA                          = 0x31
-    PERIODIC_ADVERTISING_RESPONSE_TIMING_INFORMATION = 0X32
+        PERIODIC_ADVERTISING_RESPONSE_TIMING_INFORMATION    = 0x32
-    ELECTRONIC_SHELF_LABEL                           = 0X34
+        ELECTRONIC_SHELF_LABEL                              = 0x34
-    THREE_D_INFORMATION_DATA                         = 0x3D
+        THREE_D_INFORMATION_DATA                            = 0x3D
-    MANUFACTURER_SPECIFIC_DATA                       = 0xFF
+        MANUFACTURER_SPECIFIC_DATA                          = 0xFF
 
-    AD_TYPE_NAMES = {
+    class Flags(enum.IntFlag):
-        FLAGS:                                            'FLAGS',
+        LE_LIMITED_DISCOVERABLE_MODE = 1 << 0
-        INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS:    'INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS',
+        LE_GENERAL_DISCOVERABLE_MODE = 1 << 1
-        COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS:      'COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS',
+        BR_EDR_NOT_SUPPORTED = 1 << 2
-        INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS:    'INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS',
+        SIMULTANEOUS_LE_BR_EDR_CAPABLE = 1 << 3
-        COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS:      'COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS',
-        INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS:   'INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS',
-        COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS:     'COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS',
-        SHORTENED_LOCAL_NAME:                             'SHORTENED_LOCAL_NAME',
-        COMPLETE_LOCAL_NAME:                              'COMPLETE_LOCAL_NAME',
-        TX_POWER_LEVEL:                                   'TX_POWER_LEVEL',
-        CLASS_OF_DEVICE:                                  'CLASS_OF_DEVICE',
-        SIMPLE_PAIRING_HASH_C:                            'SIMPLE_PAIRING_HASH_C',
-        SIMPLE_PAIRING_HASH_C_192:                        'SIMPLE_PAIRING_HASH_C_192',
-        SIMPLE_PAIRING_RANDOMIZER_R:                      'SIMPLE_PAIRING_RANDOMIZER_R',
-        SIMPLE_PAIRING_RANDOMIZER_R_192:                  'SIMPLE_PAIRING_RANDOMIZER_R_192',
-        DEVICE_ID:                                        'DEVICE_ID',
-        SECURITY_MANAGER_TK_VALUE:                        'SECURITY_MANAGER_TK_VALUE',
-        SECURITY_MANAGER_OUT_OF_BAND_FLAGS:               'SECURITY_MANAGER_OUT_OF_BAND_FLAGS',
-        PERIPHERAL_CONNECTION_INTERVAL_RANGE:             'PERIPHERAL_CONNECTION_INTERVAL_RANGE',
-        LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS:        'LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS',
-        LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS:       'LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS',
-        SERVICE_DATA_16_BIT_UUID:                         'SERVICE_DATA_16_BIT_UUID',
-        PUBLIC_TARGET_ADDRESS:                            'PUBLIC_TARGET_ADDRESS',
-        RANDOM_TARGET_ADDRESS:                            'RANDOM_TARGET_ADDRESS',
-        APPEARANCE:                                       'APPEARANCE',
-        ADVERTISING_INTERVAL:                             'ADVERTISING_INTERVAL',
-        LE_BLUETOOTH_DEVICE_ADDRESS:                      'LE_BLUETOOTH_DEVICE_ADDRESS',
-        LE_ROLE:                                          'LE_ROLE',
-        SIMPLE_PAIRING_HASH_C_256:                        'SIMPLE_PAIRING_HASH_C_256',
-        SIMPLE_PAIRING_RANDOMIZER_R_256:                  'SIMPLE_PAIRING_RANDOMIZER_R_256',
-        LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS:        'LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS',
-        SERVICE_DATA_32_BIT_UUID:                         'SERVICE_DATA_32_BIT_UUID',
-        SERVICE_DATA_128_BIT_UUID:                        'SERVICE_DATA_128_BIT_UUID',
-        LE_SECURE_CONNECTIONS_CONFIRMATION_VALUE:         'LE_SECURE_CONNECTIONS_CONFIRMATION_VALUE',
-        LE_SECURE_CONNECTIONS_RANDOM_VALUE:               'LE_SECURE_CONNECTIONS_RANDOM_VALUE',
-        URI:                                              'URI',
-        INDOOR_POSITIONING:                               'INDOOR_POSITIONING',
-        TRANSPORT_DISCOVERY_DATA:                         'TRANSPORT_DISCOVERY_DATA',
-        LE_SUPPORTED_FEATURES:                            'LE_SUPPORTED_FEATURES',
-        CHANNEL_MAP_UPDATE_INDICATION:                    'CHANNEL_MAP_UPDATE_INDICATION',
-        PB_ADV:                                           'PB_ADV',
-        MESH_MESSAGE:                                     'MESH_MESSAGE',
-        MESH_BEACON:                                      'MESH_BEACON',
-        BIGINFO:                                          'BIGINFO',
-        BROADCAST_CODE:                                   'BROADCAST_CODE',
-        RESOLVABLE_SET_IDENTIFIER:                        'RESOLVABLE_SET_IDENTIFIER',
-        ADVERTISING_INTERVAL_LONG:                        'ADVERTISING_INTERVAL_LONG',
-        BROADCAST_NAME:                                   'BROADCAST_NAME',
-        ENCRYPTED_ADVERTISING_DATA:                       'ENCRYPTED_ADVERTISING_DATA',
-        PERIODIC_ADVERTISING_RESPONSE_TIMING_INFORMATION: 'PERIODIC_ADVERTISING_RESPONSE_TIMING_INFORMATION',
-        ELECTRONIC_SHELF_LABEL:                           'ELECTRONIC_SHELF_LABEL',
-        THREE_D_INFORMATION_DATA:                         'THREE_D_INFORMATION_DATA',
-        MANUFACTURER_SPECIFIC_DATA:                       'MANUFACTURER_SPECIFIC_DATA'
-    }
 
-    LE_LIMITED_DISCOVERABLE_MODE_FLAG = 0x01
+    # For backward-compatibility
-    LE_GENERAL_DISCOVERABLE_MODE_FLAG = 0x02
+    FLAGS                                            = Type.FLAGS
-    BR_EDR_NOT_SUPPORTED_FLAG         = 0x04
+    INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS    = Type.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS
-    BR_EDR_CONTROLLER_FLAG            = 0x08
+    COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS      = Type.COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS
-    BR_EDR_HOST_FLAG                  = 0x10
+    INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS    = Type.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS
+    COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS      = Type.COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS
+    INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS   = Type.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS
+    COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS     = Type.COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS
+    SHORTENED_LOCAL_NAME                             = Type.SHORTENED_LOCAL_NAME
+    COMPLETE_LOCAL_NAME                              = Type.COMPLETE_LOCAL_NAME
+    TX_POWER_LEVEL                                   = Type.TX_POWER_LEVEL
+    CLASS_OF_DEVICE                                  = Type.CLASS_OF_DEVICE
+    SIMPLE_PAIRING_HASH_C                            = Type.SIMPLE_PAIRING_HASH_C
+    SIMPLE_PAIRING_HASH_C_192                        = Type.SIMPLE_PAIRING_HASH_C_192
+    SIMPLE_PAIRING_RANDOMIZER_R                      = Type.SIMPLE_PAIRING_RANDOMIZER_R
+    SIMPLE_PAIRING_RANDOMIZER_R_192                  = Type.SIMPLE_PAIRING_RANDOMIZER_R_192
+    DEVICE_ID                                        = Type.DEVICE_ID
+    SECURITY_MANAGER_TK_VALUE                        = Type.SECURITY_MANAGER_TK_VALUE
+    SECURITY_MANAGER_OUT_OF_BAND_FLAGS               = Type.SECURITY_MANAGER_OUT_OF_BAND_FLAGS
+    PERIPHERAL_CONNECTION_INTERVAL_RANGE             = Type.PERIPHERAL_CONNECTION_INTERVAL_RANGE
+    LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS        = Type.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS
+    LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS       = Type.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS
+    SERVICE_DATA                                     = Type.SERVICE_DATA_16_BIT_UUID
+    SERVICE_DATA_16_BIT_UUID                         = Type.SERVICE_DATA_16_BIT_UUID
+    PUBLIC_TARGET_ADDRESS                            = Type.PUBLIC_TARGET_ADDRESS
+    RANDOM_TARGET_ADDRESS                            = Type.RANDOM_TARGET_ADDRESS
+    APPEARANCE                                       = Type.APPEARANCE
+    ADVERTISING_INTERVAL                             = Type.ADVERTISING_INTERVAL
+    LE_BLUETOOTH_DEVICE_ADDRESS                      = Type.LE_BLUETOOTH_DEVICE_ADDRESS
+    LE_ROLE                                          = Type.LE_ROLE
+    SIMPLE_PAIRING_HASH_C_256                        = Type.SIMPLE_PAIRING_HASH_C_256
+    SIMPLE_PAIRING_RANDOMIZER_R_256                  = Type.SIMPLE_PAIRING_RANDOMIZER_R_256
+    LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS        = Type.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS
+    SERVICE_DATA_32_BIT_UUID                         = Type.SERVICE_DATA_32_BIT_UUID
+    SERVICE_DATA_128_BIT_UUID                        = Type.SERVICE_DATA_128_BIT_UUID
+    LE_SECURE_CONNECTIONS_CONFIRMATION_VALUE         = Type.LE_SECURE_CONNECTIONS_CONFIRMATION_VALUE
+    LE_SECURE_CONNECTIONS_RANDOM_VALUE               = Type.LE_SECURE_CONNECTIONS_RANDOM_VALUE
+    URI                                              = Type.URI
+    INDOOR_POSITIONING                               = Type.INDOOR_POSITIONING
+    TRANSPORT_DISCOVERY_DATA                         = Type.TRANSPORT_DISCOVERY_DATA
+    LE_SUPPORTED_FEATURES                            = Type.LE_SUPPORTED_FEATURES
+    CHANNEL_MAP_UPDATE_INDICATION                    = Type.CHANNEL_MAP_UPDATE_INDICATION
+    PB_ADV                                           = Type.PB_ADV
+    MESH_MESSAGE                                     = Type.MESH_MESSAGE
+    MESH_BEACON                                      = Type.MESH_BEACON
+    BIGINFO                                          = Type.BIGINFO
+    BROADCAST_CODE                                   = Type.BROADCAST_CODE
+    RESOLVABLE_SET_IDENTIFIER                        = Type.RESOLVABLE_SET_IDENTIFIER
+    ADVERTISING_INTERVAL_LONG                        = Type.ADVERTISING_INTERVAL_LONG
+    BROADCAST_NAME                                   = Type.BROADCAST_NAME
+    ENCRYPTED_ADVERTISING_DATA                       = Type.ENCRYPTED_ADVERTISING_DATA
+    PERIODIC_ADVERTISING_RESPONSE_TIMING_INFORMATION = Type.PERIODIC_ADVERTISING_RESPONSE_TIMING_INFORMATION
+    ELECTRONIC_SHELF_LABEL                           = Type.ELECTRONIC_SHELF_LABEL
+    THREE_D_INFORMATION_DATA                         = Type.THREE_D_INFORMATION_DATA
+    MANUFACTURER_SPECIFIC_DATA                       = Type.MANUFACTURER_SPECIFIC_DATA
 
-    ad_structures: List[Tuple[int, bytes]]
+    LE_LIMITED_DISCOVERABLE_MODE_FLAG = Flags.LE_LIMITED_DISCOVERABLE_MODE
+    LE_GENERAL_DISCOVERABLE_MODE_FLAG = Flags.LE_GENERAL_DISCOVERABLE_MODE
+    BR_EDR_NOT_SUPPORTED_FLAG         = Flags.BR_EDR_NOT_SUPPORTED
+    BR_EDR_CONTROLLER_FLAG            = Flags.SIMULTANEOUS_LE_BR_EDR_CAPABLE
+    BR_EDR_HOST_FLAG                  = 0x10 # Deprecated
+
+    ad_structures: list[tuple[int, bytes]]
 
     # fmt: on
     # pylint: enable=line-too-long
 
-    def __init__(self, ad_structures: Optional[List[Tuple[int, bytes]]] = None) -> None:
+    def __init__(self, ad_structures: Optional[list[tuple[int, bytes]]] = None) -> None:
         if ad_structures is None:
             ad_structures = []
         self.ad_structures = ad_structures[:]
@@ -1444,7 +1451,7 @@ class AdvertisingData:
         return ','.join(bit_flags_to_strings(flags, flag_names))
 
     @staticmethod
-    def uuid_list_to_objects(ad_data: bytes, uuid_size: int) -> List[UUID]:
+    def uuid_list_to_objects(ad_data: bytes, uuid_size: int) -> list[UUID]:
         uuids = []
         offset = 0
         while (offset + uuid_size) <= len(ad_data):
@@ -1461,8 +1468,8 @@ class AdvertisingData:
             ]
         )
 
-    @staticmethod
+    @classmethod
-    def ad_data_to_string(ad_type, ad_data):
+    def ad_data_to_string(cls, ad_type: int, ad_data: bytes) -> str:
         if ad_type == AdvertisingData.FLAGS:
             ad_type_str = 'Flags'
             ad_data_str = AdvertisingData.flags_to_string(ad_data[0], short=True)
@@ -1521,72 +1528,72 @@ class AdvertisingData:
             ad_type_str = 'Broadcast Name'
             ad_data_str = ad_data.decode('utf-8')
         else:
-            ad_type_str = AdvertisingData.AD_TYPE_NAMES.get(ad_type, f'0x{ad_type:02X}')
+            ad_type_str = AdvertisingData.Type(ad_type).name
             ad_data_str = ad_data.hex()
 
         return f'[{ad_type_str}]: {ad_data_str}'
 
     # pylint: disable=too-many-return-statements
-    @staticmethod
+    @classmethod
-    def ad_data_to_object(ad_type: int, ad_data: bytes) -> AdvertisingDataObject:
+    def ad_data_to_object(cls, ad_type: int, ad_data: bytes) -> AdvertisingDataObject:
         if ad_type in (
-            AdvertisingData.COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS,
         ):
             return AdvertisingData.uuid_list_to_objects(ad_data, 2)
 
         if ad_type in (
-            AdvertisingData.COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS,
         ):
             return AdvertisingData.uuid_list_to_objects(ad_data, 4)
 
         if ad_type in (
-            AdvertisingData.COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
-            AdvertisingData.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS,
         ):
             return AdvertisingData.uuid_list_to_objects(ad_data, 16)
 
-        if ad_type == AdvertisingData.SERVICE_DATA_16_BIT_UUID:
+        if ad_type == AdvertisingData.Type.SERVICE_DATA_16_BIT_UUID:
             return (UUID.from_bytes(ad_data[:2]), ad_data[2:])
 
-        if ad_type == AdvertisingData.SERVICE_DATA_32_BIT_UUID:
+        if ad_type == AdvertisingData.Type.SERVICE_DATA_32_BIT_UUID:
             return (UUID.from_bytes(ad_data[:4]), ad_data[4:])
 
-        if ad_type == AdvertisingData.SERVICE_DATA_128_BIT_UUID:
+        if ad_type == AdvertisingData.Type.SERVICE_DATA_128_BIT_UUID:
             return (UUID.from_bytes(ad_data[:16]), ad_data[16:])
 
         if ad_type in (
-            AdvertisingData.SHORTENED_LOCAL_NAME,
+            AdvertisingData.Type.SHORTENED_LOCAL_NAME,
-            AdvertisingData.COMPLETE_LOCAL_NAME,
+            AdvertisingData.Type.COMPLETE_LOCAL_NAME,
-            AdvertisingData.URI,
+            AdvertisingData.Type.URI,
-            AdvertisingData.BROADCAST_NAME,
+            AdvertisingData.Type.BROADCAST_NAME,
         ):
             return ad_data.decode("utf-8")
 
-        if ad_type in (AdvertisingData.TX_POWER_LEVEL, AdvertisingData.FLAGS):
+        if ad_type in (AdvertisingData.Type.TX_POWER_LEVEL, AdvertisingData.Type.FLAGS):
             return cast(int, struct.unpack('B', ad_data)[0])
 
-        if ad_type in (AdvertisingData.ADVERTISING_INTERVAL,):
+        if ad_type in (AdvertisingData.Type.ADVERTISING_INTERVAL,):
             return cast(int, struct.unpack('<H', ad_data)[0])
 
-        if ad_type == AdvertisingData.CLASS_OF_DEVICE:
+        if ad_type == AdvertisingData.Type.CLASS_OF_DEVICE:
             return cast(int, struct.unpack('<I', bytes([*ad_data, 0]))[0])
 
-        if ad_type == AdvertisingData.PERIPHERAL_CONNECTION_INTERVAL_RANGE:
+        if ad_type == AdvertisingData.Type.PERIPHERAL_CONNECTION_INTERVAL_RANGE:
-            return cast(Tuple[int, int], struct.unpack('<HH', ad_data))
+            return cast(tuple[int, int], struct.unpack('<HH', ad_data))
 
-        if ad_type == AdvertisingData.MANUFACTURER_SPECIFIC_DATA:
+        if ad_type == AdvertisingData.Type.APPEARANCE:
-            return (cast(int, struct.unpack_from('<H', ad_data, 0)[0]), ad_data[2:])
-
-        if ad_type == AdvertisingData.APPEARANCE:
             return Appearance.from_int(
                 cast(int, struct.unpack_from('<H', ad_data, 0)[0])
             )
 
+        if ad_type == AdvertisingData.Type.MANUFACTURER_SPECIFIC_DATA:
+            return (cast(int, struct.unpack_from('<H', ad_data, 0)[0]), ad_data[2:])
+
         return ad_data
 
     def append(self, data: bytes) -> None:
@@ -1600,7 +1607,80 @@ class AdvertisingData:
                 self.ad_structures.append((ad_type, ad_data))
             offset += length
 
-    def get_all(self, type_id: int, raw: bool = False) -> List[AdvertisingDataObject]:
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS,
+        ],
+        raw: Literal[False] = False,
+    ) -> list[list[UUID]]: ...
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.SERVICE_DATA_16_BIT_UUID,
+            AdvertisingData.Type.SERVICE_DATA_32_BIT_UUID,
+            AdvertisingData.Type.SERVICE_DATA_128_BIT_UUID,
+        ],
+        raw: Literal[False] = False,
+    ) -> list[tuple[UUID, bytes]]: ...
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.SHORTENED_LOCAL_NAME,
+            AdvertisingData.Type.COMPLETE_LOCAL_NAME,
+            AdvertisingData.Type.URI,
+            AdvertisingData.Type.BROADCAST_NAME,
+        ],
+        raw: Literal[False] = False,
+    ) -> list[str]: ...
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.TX_POWER_LEVEL,
+            AdvertisingData.Type.FLAGS,
+            AdvertisingData.Type.ADVERTISING_INTERVAL,
+            AdvertisingData.Type.CLASS_OF_DEVICE,
+        ],
+        raw: Literal[False] = False,
+    ) -> list[int]: ...
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[AdvertisingData.Type.PERIPHERAL_CONNECTION_INTERVAL_RANGE,],
+        raw: Literal[False] = False,
+    ) -> list[tuple[int, int]]: ...
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[AdvertisingData.Type.MANUFACTURER_SPECIFIC_DATA,],
+        raw: Literal[False] = False,
+    ) -> list[tuple[int, bytes]]: ...
+    @overload
+    def get_all(
+        self,
+        type_id: Literal[AdvertisingData.Type.APPEARANCE,],
+        raw: Literal[False] = False,
+    ) -> list[Appearance]: ...
+    @overload
+    def get_all(self, type_id: int, raw: Literal[True]) -> list[bytes]: ...
+    @overload
+    def get_all(
+        self, type_id: int, raw: bool = False
+    ) -> list[AdvertisingDataObject]: ...
+
+    def get_all(self, type_id: int, raw: bool = False) -> list[AdvertisingDataObject]:  # type: ignore[misc]
         '''
         Get Advertising Data Structure(s) with a given type
 
@@ -1612,6 +1692,79 @@ class AdvertisingData:
 
         return [process_ad_data(ad[1]) for ad in self.ad_structures if ad[0] == type_id]
 
+    @overload
+    def get(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.COMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_16_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.LIST_OF_16_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_32_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.LIST_OF_32_BIT_SERVICE_SOLICITATION_UUIDS,
+            AdvertisingData.Type.COMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.INCOMPLETE_LIST_OF_128_BIT_SERVICE_CLASS_UUIDS,
+            AdvertisingData.Type.LIST_OF_128_BIT_SERVICE_SOLICITATION_UUIDS,
+        ],
+        raw: Literal[False] = False,
+    ) -> Optional[list[UUID]]: ...
+    @overload
+    def get(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.SERVICE_DATA_16_BIT_UUID,
+            AdvertisingData.Type.SERVICE_DATA_32_BIT_UUID,
+            AdvertisingData.Type.SERVICE_DATA_128_BIT_UUID,
+        ],
+        raw: Literal[False] = False,
+    ) -> Optional[tuple[UUID, bytes]]: ...
+    @overload
+    def get(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.SHORTENED_LOCAL_NAME,
+            AdvertisingData.Type.COMPLETE_LOCAL_NAME,
+            AdvertisingData.Type.URI,
+            AdvertisingData.Type.BROADCAST_NAME,
+        ],
+        raw: Literal[False] = False,
+    ) -> Optional[Optional[str]]: ...
+    @overload
+    def get(
+        self,
+        type_id: Literal[
+            AdvertisingData.Type.TX_POWER_LEVEL,
+            AdvertisingData.Type.FLAGS,
+            AdvertisingData.Type.ADVERTISING_INTERVAL,
+            AdvertisingData.Type.CLASS_OF_DEVICE,
+        ],
+        raw: Literal[False] = False,
+    ) -> Optional[int]: ...
+    @overload
+    def get(
+        self,
+        type_id: Literal[AdvertisingData.Type.PERIPHERAL_CONNECTION_INTERVAL_RANGE,],
+        raw: Literal[False] = False,
+    ) -> Optional[tuple[int, int]]: ...
+    @overload
+    def get(
+        self,
+        type_id: Literal[AdvertisingData.Type.MANUFACTURER_SPECIFIC_DATA,],
+        raw: Literal[False] = False,
+    ) -> Optional[tuple[int, bytes]]: ...
+    @overload
+    def get(
+        self,
+        type_id: Literal[AdvertisingData.Type.APPEARANCE,],
+        raw: Literal[False] = False,
+    ) -> Optional[Appearance]: ...
+    @overload
+    def get(self, type_id: int, raw: Literal[True]) -> Optional[bytes]: ...
+    @overload
+    def get(
+        self, type_id: int, raw: bool = False
+    ) -> Optional[AdvertisingDataObject]: ...
+
     def get(self, type_id: int, raw: bool = False) -> Optional[AdvertisingDataObject]:
         '''
         Get Advertising Data Structure(s) with a given type

bumble/drivers/__init__.py

@@ -25,8 +25,8 @@ import pathlib
 import platform
 from typing import Dict, Iterable, Optional, Type, TYPE_CHECKING
 
-from . import rtk, intel
+from bumble.drivers import rtk, intel
-from .common import Driver
+from bumble.drivers.common import Driver
 
 if TYPE_CHECKING:
     from bumble.host import Host

bumble/gap.py

@@ -18,7 +18,7 @@
 import logging
 import struct
 
-from .gatt import (
+from bumble.gatt import (
     Service,
     Characteristic,
     GATT_GENERIC_ACCESS_SERVICE,

bumble/gatt.py

@@ -27,29 +27,16 @@ import enum
 import functools
 import logging
 import struct
-from typing import (
+from typing import Iterable, List, Optional, Sequence, TypeVar, Union
-    Any,
-    Callable,
-    Dict,
-    Iterable,
-    List,
-    Optional,
-    Sequence,
-    SupportsBytes,
-    Type,
-    Union,
-    TYPE_CHECKING,
-)
 
 from bumble.colors import color
-from bumble.core import BaseBumbleError, InvalidOperationError, UUID
+from bumble.core import BaseBumbleError, UUID
 from bumble.att import Attribute, AttributeValue
-from bumble.utils import ByteSerializable
-
-if TYPE_CHECKING:
-    from bumble.gatt_client import AttributeProxy
-    from bumble.device import Connection
 
+# -----------------------------------------------------------------------------
+# Typing
+# -----------------------------------------------------------------------------
+_T = TypeVar('_T')
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -299,6 +286,22 @@ GATT_ASHA_AUDIO_STATUS_CHARACTERISTIC         = UUID('38663f1a-e711-4cac-b641-32
 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')
 
+# Apple Notification Center Service
+GATT_ANCS_SERVICE                            = UUID('7905F431-B5CE-4E99-A40F-4B1E122D00D0', 'Apple Notification Center')
+GATT_ANCS_NOTIFICATION_SOURCE_CHARACTERISTIC = UUID('9FBF120D-6301-42D9-8C58-25E699A21DBD', 'Notification Source')
+GATT_ANCS_CONTROL_POINT_CHARACTERISTIC       = UUID('69D1D8F3-45E1-49A8-9821-9BBDFDAAD9D9', 'Control Point')
+GATT_ANCS_DATA_SOURCE_CHARACTERISTIC         = UUID('22EAC6E9-24D6-4BB5-BE44-B36ACE7C7BFB', 'Data Source')
+
+# Apple Media Service
+GATT_AMS_SERVICE                         = UUID('89D3502B-0F36-433A-8EF4-C502AD55F8DC', 'Apple Media')
+GATT_AMS_REMOTE_COMMAND_CHARACTERISTIC   = UUID('9B3C81D8-57B1-4A8A-B8DF-0E56F7CA51C2', 'Remote Command')
+GATT_AMS_ENTITY_UPDATE_CHARACTERISTIC    = UUID('2F7CABCE-808D-411F-9A0C-BB92BA96C102', 'Entity Update')
+GATT_AMS_ENTITY_ATTRIBUTE_CHARACTERISTIC = UUID('C6B2F38C-23AB-46D8-A6AB-A3A870BBD5D7', 'Entity Attribute')
+
+# Misc Apple Services
+GATT_APPLE_CONTINUITY_SERVICE = UUID('D0611E78-BBB4-4591-A5F8-487910AE4366', 'Apple Continuity')
+GATT_APPLE_NEARBY_SERVICE     = UUID('9FA480E0-4967-4542-9390-D343DC5D04AE', 'Apple Nearby')
+
 # Misc
 GATT_DEVICE_NAME_CHARACTERISTIC                                = UUID.from_16_bits(0x2A00, 'Device Name')
 GATT_APPEARANCE_CHARACTERISTIC                                 = UUID.from_16_bits(0x2A01, 'Appearance')
@@ -437,7 +440,7 @@ class IncludedServiceDeclaration(Attribute):
 
 
 # -----------------------------------------------------------------------------
-class Characteristic(Attribute):
+class Characteristic(Attribute[_T]):
     '''
     See Vol 3, Part G - 3.3 CHARACTERISTIC DEFINITION
     '''
@@ -445,6 +448,8 @@ class Characteristic(Attribute):
     uuid: UUID
     properties: Characteristic.Properties
 
+    EVENT_SUBSCRIPTION = "subscription"
+
     class Properties(enum.IntFlag):
         """Property flags"""
 
@@ -500,7 +505,7 @@ class Characteristic(Attribute):
         uuid: Union[str, bytes, UUID],
         properties: Characteristic.Properties,
         permissions: Union[str, Attribute.Permissions],
-        value: Any = b'',
+        value: Union[AttributeValue[_T], _T, None] = None,
         descriptors: Sequence[Descriptor] = (),
     ):
         super().__init__(uuid, permissions, value)
@@ -560,217 +565,10 @@ class CharacteristicDeclaration(Attribute):
 
 
 # -----------------------------------------------------------------------------
-class CharacteristicValue(AttributeValue):
+class CharacteristicValue(AttributeValue[_T]):
     """Same as AttributeValue, for backward compatibility"""
 
 
-# -----------------------------------------------------------------------------
-class CharacteristicAdapter:
-    '''
-    An adapter that can adapt Characteristic and AttributeProxy objects
-    by wrapping their `read_value()` and `write_value()` methods with ones that
-    return/accept encoded/decoded values.
-
-    For proxies (i.e used by a GATT client), the adaptation is one where the return
-    value of `read_value()` is decoded and the value passed to `write_value()` is
-    encoded. The `subscribe()` method, is wrapped with one where the values are decoded
-    before being passed to the subscriber.
-
-    For local values (i.e hosted by a GATT server) the adaptation is one where the
-    return value of `read_value()` is encoded and the value passed to `write_value()`
-    is decoded.
-    '''
-
-    read_value: Callable
-    write_value: Callable
-
-    def __init__(self, characteristic: Union[Characteristic, AttributeProxy]):
-        self.wrapped_characteristic = characteristic
-        self.subscribers: Dict[Callable, Callable] = (
-            {}
-        )  # Map from subscriber to proxy subscriber
-
-        if isinstance(characteristic, Characteristic):
-            self.read_value = self.read_encoded_value
-            self.write_value = self.write_encoded_value
-        else:
-            self.read_value = self.read_decoded_value
-            self.write_value = self.write_decoded_value
-            self.subscribe = self.wrapped_subscribe
-            self.unsubscribe = self.wrapped_unsubscribe
-
-    def __getattr__(self, name):
-        return getattr(self.wrapped_characteristic, name)
-
-    def __setattr__(self, name, value):
-        if name in (
-            'wrapped_characteristic',
-            'subscribers',
-            'read_value',
-            'write_value',
-            'subscribe',
-            'unsubscribe',
-        ):
-            super().__setattr__(name, value)
-        else:
-            setattr(self.wrapped_characteristic, name, value)
-
-    async def read_encoded_value(self, connection):
-        return self.encode_value(
-            await self.wrapped_characteristic.read_value(connection)
-        )
-
-    async def write_encoded_value(self, connection, value):
-        return await 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
-        )
-
-    def encode_value(self, value):
-        return value
-
-    def decode_value(self, value):
-        return value
-
-    def wrapped_subscribe(self, subscriber=None):
-        if subscriber is not None:
-            if subscriber in self.subscribers:
-                # We already have a proxy subscriber
-                subscriber = self.subscribers[subscriber]
-            else:
-                # Create and register a proxy that will decode the value
-                original_subscriber = subscriber
-
-                def on_change(value):
-                    original_subscriber(self.decode_value(value))
-
-                self.subscribers[subscriber] = on_change
-                subscriber = on_change
-
-        return self.wrapped_characteristic.subscribe(subscriber)
-
-    def wrapped_unsubscribe(self, subscriber=None):
-        if subscriber in self.subscribers:
-            subscriber = self.subscribers.pop(subscriber)
-
-        return self.wrapped_characteristic.unsubscribe(subscriber)
-
-    def __str__(self) -> str:
-        wrapped = str(self.wrapped_characteristic)
-        return f'{self.__class__.__name__}({wrapped})'
-
-
-# -----------------------------------------------------------------------------
-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
-        self.decode = decode
-
-    def encode_value(self, value):
-        if self.encode is None:
-            raise InvalidOperationError('delegated adapter does not have an encoder')
-        return self.encode(value)
-
-    def decode_value(self, value):
-        if self.decode is None:
-            raise InvalidOperationError('delegate adapter does not have a decoder')
-        return self.decode(value)
-
-
-# -----------------------------------------------------------------------------
-class PackedCharacteristicAdapter(CharacteristicAdapter):
-    '''
-    Adapter that packs/unpacks characteristic values according to a standard
-    Python `struct` format.
-    For formats with a single value, the adapted `read_value` and `write_value`
-    methods return/accept single values. For formats with multiple values,
-    they return/accept a tuple with the same number of elements as is required for
-    the format.
-    '''
-
-    def __init__(self, characteristic, pack_format):
-        super().__init__(characteristic)
-        self.struct = struct.Struct(pack_format)
-
-    def pack(self, *values):
-        return self.struct.pack(*values)
-
-    def unpack(self, buffer):
-        return self.struct.unpack(buffer)
-
-    def encode_value(self, value):
-        return self.pack(*value if isinstance(value, tuple) else (value,))
-
-    def decode_value(self, value):
-        unpacked = self.unpack(value)
-        return unpacked[0] if len(unpacked) == 1 else unpacked
-
-
-# -----------------------------------------------------------------------------
-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 a 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.
-    '''
-
-    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))
-
-    def unpack(self, buffer):
-        return dict(zip(self.keys, super().unpack(buffer)))
-
-
-# -----------------------------------------------------------------------------
-class UTF8CharacteristicAdapter(CharacteristicAdapter):
-    '''
-    Adapter that converts strings to/from bytes using UTF-8 encoding
-    '''
-
-    def encode_value(self, value: str) -> bytes:
-        return value.encode('utf-8')
-
-    def decode_value(self, value: bytes) -> str:
-        return value.decode('utf-8')
-
-
-# -----------------------------------------------------------------------------
-class SerializableCharacteristicAdapter(CharacteristicAdapter):
-    '''
-    Adapter that converts any class to/from bytes using the class'
-    `to_bytes` and `__bytes__` methods, respectively.
-    '''
-
-    def __init__(self, characteristic, cls: Type[ByteSerializable]):
-        super().__init__(characteristic)
-        self.cls = cls
-
-    def encode_value(self, value: SupportsBytes) -> bytes:
-        return bytes(value)
-
-    def decode_value(self, value: bytes) -> Any:
-        return self.cls.from_bytes(value)
-
-
 # -----------------------------------------------------------------------------
 class Descriptor(Attribute):
     '''
@@ -805,3 +603,23 @@ class ClientCharacteristicConfigurationBits(enum.IntFlag):
     DEFAULT = 0x0000
     NOTIFICATION = 0x0001
     INDICATION = 0x0002
+
+
+# -----------------------------------------------------------------------------
+class ClientSupportedFeatures(enum.IntFlag):
+    '''
+    See Vol 3, Part G - 7.2 - Table 7.6: Client Supported Features bit assignments.
+    '''
+
+    ROBUST_CACHING = 0x01
+    ENHANCED_ATT_BEARER = 0x02
+    MULTIPLE_HANDLE_VALUE_NOTIFICATIONS = 0x04
+
+
+# -----------------------------------------------------------------------------
+class ServerSupportedFeatures(enum.IntFlag):
+    '''
+    See Vol 3, Part G - 7.4 - Table 7.11: Server Supported Features bit assignments.
+    '''
+
+    EATT_SUPPORTED = 0x01

bumble/gatt_adapters.py

@@ -0,0 +1,374 @@
+# Copyright 2025 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.
+
+# -----------------------------------------------------------------------------
+# GATT - Type Adapters
+# -----------------------------------------------------------------------------
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+from __future__ import annotations
+import struct
+from typing import (
+    Any,
+    Callable,
+    Generic,
+    Iterable,
+    Literal,
+    Optional,
+    Type,
+    TypeVar,
+)
+
+from bumble.core import InvalidOperationError
+from bumble.gatt import Characteristic
+from bumble.gatt_client import CharacteristicProxy
+from bumble import utils
+
+
+# -----------------------------------------------------------------------------
+# Typing
+# -----------------------------------------------------------------------------
+_T = TypeVar('_T')
+_T2 = TypeVar('_T2', bound=utils.ByteSerializable)
+_T3 = TypeVar('_T3', bound=utils.IntConvertible)
+
+
+# -----------------------------------------------------------------------------
+class CharacteristicAdapter(Characteristic, Generic[_T]):
+    '''Base class for GATT Characteristic adapters.'''
+
+    def __init__(self, characteristic: Characteristic) -> None:
+        super().__init__(
+            characteristic.uuid,
+            characteristic.properties,
+            characteristic.permissions,
+            characteristic.value,
+            characteristic.descriptors,
+        )
+
+
+# -----------------------------------------------------------------------------
+class CharacteristicProxyAdapter(CharacteristicProxy[_T]):
+    '''Base class for GATT CharacteristicProxy adapters.'''
+
+    def __init__(self, characteristic_proxy: CharacteristicProxy):
+        super().__init__(
+            characteristic_proxy.client,
+            characteristic_proxy.handle,
+            characteristic_proxy.end_group_handle,
+            characteristic_proxy.uuid,
+            characteristic_proxy.properties,
+        )
+
+
+# -----------------------------------------------------------------------------
+class DelegatedCharacteristicAdapter(CharacteristicAdapter[_T]):
+    '''
+    Adapter that converts bytes values using an encode and/or a decode function.
+    '''
+
+    def __init__(
+        self,
+        characteristic: Characteristic,
+        encode: Optional[Callable[[_T], bytes]] = None,
+        decode: Optional[Callable[[bytes], _T]] = None,
+    ):
+        super().__init__(characteristic)
+        self.encode = encode
+        self.decode = decode
+
+    def encode_value(self, value: _T) -> bytes:
+        if self.encode is None:
+            raise InvalidOperationError('delegated adapter does not have an encoder')
+        return self.encode(value)
+
+    def decode_value(self, value: bytes) -> _T:
+        if self.decode is None:
+            raise InvalidOperationError('delegate adapter does not have a decoder')
+        return self.decode(value)
+
+
+# -----------------------------------------------------------------------------
+class DelegatedCharacteristicProxyAdapter(CharacteristicProxyAdapter[_T]):
+    '''
+    Adapter that converts bytes values using an encode and a decode function.
+    '''
+
+    def __init__(
+        self,
+        characteristic_proxy: CharacteristicProxy,
+        encode: Optional[Callable[[_T], bytes]] = None,
+        decode: Optional[Callable[[bytes], _T]] = None,
+    ):
+        super().__init__(characteristic_proxy)
+        self.encode = encode
+        self.decode = decode
+
+    def encode_value(self, value: _T) -> bytes:
+        if self.encode is None:
+            raise InvalidOperationError('delegated adapter does not have an encoder')
+        return self.encode(value)
+
+    def decode_value(self, value: bytes) -> _T:
+        if self.decode is None:
+            raise InvalidOperationError('delegate adapter does not have a decoder')
+        return self.decode(value)
+
+
+# -----------------------------------------------------------------------------
+class PackedCharacteristicAdapter(CharacteristicAdapter):
+    '''
+    Adapter that packs/unpacks characteristic values according to a standard
+    Python `struct` format.
+    For formats with a single value, the adapted `read_value` and `write_value`
+    methods return/accept single values. For formats with multiple values,
+    they return/accept a tuple with the same number of elements as is required for
+    the format.
+    '''
+
+    def __init__(self, characteristic: Characteristic, pack_format: str) -> None:
+        super().__init__(characteristic)
+        self.struct = struct.Struct(pack_format)
+
+    def pack(self, *values) -> bytes:
+        return self.struct.pack(*values)
+
+    def unpack(self, buffer: bytes) -> tuple:
+        return self.struct.unpack(buffer)
+
+    def encode_value(self, value: Any) -> bytes:
+        return self.pack(*value if isinstance(value, tuple) else (value,))
+
+    def decode_value(self, value: bytes) -> Any:
+        unpacked = self.unpack(value)
+        return unpacked[0] if len(unpacked) == 1 else unpacked
+
+
+# -----------------------------------------------------------------------------
+class PackedCharacteristicProxyAdapter(CharacteristicProxyAdapter):
+    '''
+    Adapter that packs/unpacks characteristic values according to a standard
+    Python `struct` format.
+    For formats with a single value, the adapted `read_value` and `write_value`
+    methods return/accept single values. For formats with multiple values,
+    they return/accept a tuple with the same number of elements as is required for
+    the format.
+    '''
+
+    def __init__(self, characteristic_proxy, pack_format):
+        super().__init__(characteristic_proxy)
+        self.struct = struct.Struct(pack_format)
+
+    def pack(self, *values) -> bytes:
+        return self.struct.pack(*values)
+
+    def unpack(self, buffer: bytes) -> tuple:
+        return self.struct.unpack(buffer)
+
+    def encode_value(self, value: Any) -> bytes:
+        return self.pack(*value if isinstance(value, tuple) else (value,))
+
+    def decode_value(self, value: bytes) -> Any:
+        unpacked = self.unpack(value)
+        return unpacked[0] if len(unpacked) == 1 else unpacked
+
+
+# -----------------------------------------------------------------------------
+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 a 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.
+    '''
+
+    def __init__(
+        self, characteristic: Characteristic, pack_format: str, keys: Iterable[str]
+    ) -> None:
+        super().__init__(characteristic, pack_format)
+        self.keys = keys
+
+    # pylint: disable=arguments-differ
+    def pack(self, values) -> bytes:
+        return super().pack(*(values[key] for key in self.keys))
+
+    def unpack(self, buffer: bytes) -> Any:
+        return dict(zip(self.keys, super().unpack(buffer)))
+
+
+# -----------------------------------------------------------------------------
+class MappedCharacteristicProxyAdapter(PackedCharacteristicProxyAdapter):
+    '''
+    Adapter that packs/unpacks characteristic values according to a standard
+    Python `struct` format.
+    The adapted `read_value` and `write_value` methods return/accept a 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.
+    '''
+
+    def __init__(
+        self,
+        characteristic_proxy: CharacteristicProxy,
+        pack_format: str,
+        keys: Iterable[str],
+    ) -> None:
+        super().__init__(characteristic_proxy, pack_format)
+        self.keys = keys
+
+    # pylint: disable=arguments-differ
+    def pack(self, values) -> bytes:
+        return super().pack(*(values[key] for key in self.keys))
+
+    def unpack(self, buffer: bytes) -> Any:
+        return dict(zip(self.keys, super().unpack(buffer)))
+
+
+# -----------------------------------------------------------------------------
+class UTF8CharacteristicAdapter(CharacteristicAdapter[str]):
+    '''
+    Adapter that converts strings to/from bytes using UTF-8 encoding
+    '''
+
+    def encode_value(self, value: str) -> bytes:
+        return value.encode('utf-8')
+
+    def decode_value(self, value: bytes) -> str:
+        return value.decode('utf-8')
+
+
+# -----------------------------------------------------------------------------
+class UTF8CharacteristicProxyAdapter(CharacteristicProxyAdapter[str]):
+    '''
+    Adapter that converts strings to/from bytes using UTF-8 encoding
+    '''
+
+    def encode_value(self, value: str) -> bytes:
+        return value.encode('utf-8')
+
+    def decode_value(self, value: bytes) -> str:
+        return value.decode('utf-8')
+
+
+# -----------------------------------------------------------------------------
+class SerializableCharacteristicAdapter(CharacteristicAdapter[_T2]):
+    '''
+    Adapter that converts any class to/from bytes using the class'
+    `to_bytes` and `__bytes__` methods, respectively.
+    '''
+
+    def __init__(self, characteristic: Characteristic, cls: Type[_T2]) -> None:
+        super().__init__(characteristic)
+        self.cls = cls
+
+    def encode_value(self, value: _T2) -> bytes:
+        return bytes(value)
+
+    def decode_value(self, value: bytes) -> _T2:
+        return self.cls.from_bytes(value)
+
+
+# -----------------------------------------------------------------------------
+class SerializableCharacteristicProxyAdapter(CharacteristicProxyAdapter[_T2]):
+    '''
+    Adapter that converts any class to/from bytes using the class'
+    `to_bytes` and `__bytes__` methods, respectively.
+    '''
+
+    def __init__(
+        self, characteristic_proxy: CharacteristicProxy, cls: Type[_T2]
+    ) -> None:
+        super().__init__(characteristic_proxy)
+        self.cls = cls
+
+    def encode_value(self, value: _T2) -> bytes:
+        return bytes(value)
+
+    def decode_value(self, value: bytes) -> _T2:
+        return self.cls.from_bytes(value)
+
+
+# -----------------------------------------------------------------------------
+class EnumCharacteristicAdapter(CharacteristicAdapter[_T3]):
+    '''
+    Adapter that converts int-enum-like classes to/from bytes using the class'
+    `int().to_bytes()` and `from_bytes()` methods, respectively.
+    '''
+
+    def __init__(
+        self,
+        characteristic: Characteristic,
+        cls: Type[_T3],
+        length: int,
+        byteorder: Literal['little', 'big'] = 'little',
+    ):
+        """
+        Initialize an instance.
+
+        Params:
+          characteristic: the Characteristic to adapt to/from
+          cls: the class to/from which to convert integer values
+          length: number of bytes used to represent integer values
+          byteorder: byte order of the byte representation of integers.
+        """
+        super().__init__(characteristic)
+        self.cls = cls
+        self.length = length
+        self.byteorder = byteorder
+
+    def encode_value(self, value: _T3) -> bytes:
+        return int(value).to_bytes(self.length, self.byteorder)
+
+    def decode_value(self, value: bytes) -> _T3:
+        int_value = int.from_bytes(value, self.byteorder)
+        return self.cls(int_value)
+
+
+# -----------------------------------------------------------------------------
+class EnumCharacteristicProxyAdapter(CharacteristicProxyAdapter[_T3]):
+    '''
+    Adapter that converts int-enum-like classes to/from bytes using the class'
+    `int().to_bytes()` and `from_bytes()` methods, respectively.
+    '''
+
+    def __init__(
+        self,
+        characteristic_proxy: CharacteristicProxy,
+        cls: Type[_T3],
+        length: int,
+        byteorder: Literal['little', 'big'] = 'little',
+    ):
+        """
+        Initialize an instance.
+
+        Params:
+          characteristic_proxy: the CharacteristicProxy to adapt to/from
+          cls: the class to/from which to convert integer values
+          length: number of bytes used to represent integer values
+          byteorder: byte order of the byte representation of integers.
+        """
+        super().__init__(characteristic_proxy)
+        self.cls = cls
+        self.length = length
+        self.byteorder = byteorder
+
+    def encode_value(self, value: _T3) -> bytes:
+        return int(value).to_bytes(self.length, self.byteorder)
+
+    def decode_value(self, value: bytes) -> _T3:
+        int_value = int.from_bytes(value, self.byteorder)
+        a = self.cls(int_value)
+        return self.cls(int_value)

bumble/gatt_client.py

@@ -29,24 +29,25 @@ import logging
 import struct
 from datetime import datetime
 from typing import (
+    Any,
+    Callable,
+    Dict,
+    Generic,
+    Iterable,
     List,
     Optional,
-    Dict,
-    Tuple,
-    Callable,
-    Union,
-    Any,
-    Iterable,
-    Type,
     Set,
+    Tuple,
+    Union,
+    Type,
+    TypeVar,
     TYPE_CHECKING,
 )
 
-from pyee import EventEmitter
 
-from .colors import color
+from bumble.colors import color
-from .hci import HCI_Constant
+from bumble.hci import HCI_Constant
-from .att import (
+from bumble.att import (
     ATT_ATTRIBUTE_NOT_FOUND_ERROR,
     ATT_ATTRIBUTE_NOT_LONG_ERROR,
     ATT_CID,
@@ -67,9 +68,10 @@ from .att import (
     ATT_Write_Request,
     ATT_Error,
 )
-from . import core
+from bumble import utils
-from .core import UUID, InvalidStateError
+from bumble import core
-from .gatt import (
+from bumble.core import UUID, InvalidStateError
+from bumble.gatt import (
     GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
     GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR,
     GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
@@ -82,9 +84,14 @@ from .gatt import (
     TemplateService,
 )
 
+# -----------------------------------------------------------------------------
+# Typing
+# -----------------------------------------------------------------------------
 if TYPE_CHECKING:
     from bumble.device import Connection
 
+_T = TypeVar('_T')
+
 # -----------------------------------------------------------------------------
 # Logging
 # -----------------------------------------------------------------------------
@@ -110,31 +117,31 @@ def show_services(services: Iterable[ServiceProxy]) -> None:
 # -----------------------------------------------------------------------------
 # Proxies
 # -----------------------------------------------------------------------------
-class AttributeProxy(EventEmitter):
+class AttributeProxy(utils.EventEmitter, Generic[_T]):
     def __init__(
         self, client: Client, handle: int, end_group_handle: int, attribute_type: UUID
     ) -> None:
-        EventEmitter.__init__(self)
+        utils.EventEmitter.__init__(self)
         self.client = client
         self.handle = handle
         self.end_group_handle = end_group_handle
         self.type = attribute_type
 
-    async def read_value(self, no_long_read: bool = False) -> bytes:
+    async def read_value(self, no_long_read: bool = False) -> _T:
         return self.decode_value(
             await self.client.read_value(self.handle, no_long_read)
         )
 
-    async def write_value(self, value, with_response=False):
+    async def write_value(self, value: _T, with_response=False):
         return await self.client.write_value(
             self.handle, self.encode_value(value), with_response
         )
 
-    def encode_value(self, value: Any) -> bytes:
+    def encode_value(self, value: _T) -> bytes:
-        return value
+        return value  # type: ignore
 
-    def decode_value(self, value_bytes: bytes) -> Any:
+    def decode_value(self, value: bytes) -> _T:
-        return value_bytes
+        return value  # type: ignore
 
     def __str__(self) -> str:
         return f'Attribute(handle=0x{self.handle:04X}, type={self.type})'
@@ -142,7 +149,7 @@ class AttributeProxy(EventEmitter):
 
 class ServiceProxy(AttributeProxy):
     uuid: UUID
-    characteristics: List[CharacteristicProxy]
+    characteristics: List[CharacteristicProxy[bytes]]
     included_services: List[ServiceProxy]
 
     @staticmethod
@@ -163,14 +170,20 @@ class ServiceProxy(AttributeProxy):
         self.uuid = uuid
         self.characteristics = []
 
-    async def discover_characteristics(self, uuids=()) -> list[CharacteristicProxy]:
+    async def discover_characteristics(
+        self, uuids=()
+    ) -> list[CharacteristicProxy[bytes]]:
         return await self.client.discover_characteristics(uuids, self)
 
-    def get_characteristics_by_uuid(self, uuid: UUID) -> list[CharacteristicProxy]:
+    def get_characteristics_by_uuid(
+        self, uuid: UUID
+    ) -> list[CharacteristicProxy[bytes]]:
         """Get all the characteristics with a specified UUID."""
         return self.client.get_characteristics_by_uuid(uuid, self)
 
-    def get_required_characteristic_by_uuid(self, uuid: UUID) -> CharacteristicProxy:
+    def get_required_characteristic_by_uuid(
+        self, uuid: UUID
+    ) -> CharacteristicProxy[bytes]:
         """
         Get the first characteristic with a specified UUID.
 
@@ -184,19 +197,21 @@ class ServiceProxy(AttributeProxy):
         return f'Service(handle=0x{self.handle:04X}, uuid={self.uuid})'
 
 
-class CharacteristicProxy(AttributeProxy):
+class CharacteristicProxy(AttributeProxy[_T]):
     properties: Characteristic.Properties
     descriptors: List[DescriptorProxy]
-    subscribers: Dict[Any, Callable[[bytes], Any]]
+    subscribers: Dict[Any, Callable[[_T], Any]]
+
+    EVENT_UPDATE = "update"
 
     def __init__(
         self,
-        client,
+        client: Client,
-        handle,
+        handle: int,
-        end_group_handle,
+        end_group_handle: int,
-        uuid,
+        uuid: UUID,
         properties: int,
-    ):
+    ) -> None:
         super().__init__(client, handle, end_group_handle, uuid)
         self.uuid = uuid
         self.properties = Characteristic.Properties(properties)
@@ -204,21 +219,21 @@ class CharacteristicProxy(AttributeProxy):
         self.descriptors_discovered = False
         self.subscribers = {}  # Map from subscriber to proxy subscriber
 
-    def get_descriptor(self, descriptor_type):
+    def get_descriptor(self, descriptor_type: UUID) -> Optional[DescriptorProxy]:
         for descriptor in self.descriptors:
             if descriptor.type == descriptor_type:
                 return descriptor
 
         return None
 
-    async def discover_descriptors(self):
+    async def discover_descriptors(self) -> list[DescriptorProxy]:
         return await self.client.discover_descriptors(self)
 
     async def subscribe(
         self,
-        subscriber: Optional[Callable[[bytes], Any]] = None,
+        subscriber: Optional[Callable[[_T], Any]] = None,
         prefer_notify: bool = True,
-    ):
+    ) -> None:
         if subscriber is not None:
             if subscriber in self.subscribers:
                 # We already have a proxy subscriber
@@ -233,13 +248,13 @@ class CharacteristicProxy(AttributeProxy):
                 self.subscribers[subscriber] = on_change
                 subscriber = on_change
 
-        return await self.client.subscribe(self, subscriber, prefer_notify)
+        await self.client.subscribe(self, subscriber, prefer_notify)
 
-    async def unsubscribe(self, subscriber=None, force=False):
+    async def unsubscribe(self, subscriber=None, force=False) -> None:
         if subscriber in self.subscribers:
             subscriber = self.subscribers.pop(subscriber)
 
-        return await self.client.unsubscribe(self, subscriber, force)
+        await self.client.unsubscribe(self, subscriber, force)
 
     def __str__(self) -> str:
         return (
@@ -249,8 +264,8 @@ class CharacteristicProxy(AttributeProxy):
         )
 
 
-class DescriptorProxy(AttributeProxy):
+class DescriptorProxy(AttributeProxy[bytes]):
-    def __init__(self, client, handle, descriptor_type):
+    def __init__(self, client: Client, handle: int, descriptor_type: UUID) -> None:
         super().__init__(client, handle, 0, descriptor_type)
 
     def __str__(self) -> str:
@@ -295,7 +310,7 @@ class Client:
         self.services = []
         self.cached_values = {}
 
-        connection.on('disconnection', self.on_disconnection)
+        connection.on(connection.EVENT_DISCONNECTION, self.on_disconnection)
 
     def send_gatt_pdu(self, pdu: bytes) -> None:
         self.connection.send_l2cap_pdu(ATT_CID, pdu)
@@ -369,7 +384,7 @@ class Client:
 
     def get_characteristics_by_uuid(
         self, uuid: UUID, service: Optional[ServiceProxy] = None
-    ) -> List[CharacteristicProxy]:
+    ) -> List[CharacteristicProxy[bytes]]:
         services = [service] if service else self.services
         return [
             c
@@ -621,7 +636,7 @@ class Client:
 
     async def discover_characteristics(
         self, uuids, service: Optional[ServiceProxy]
-    ) -> List[CharacteristicProxy]:
+    ) -> List[CharacteristicProxy[bytes]]:
         '''
         See Vol 3, Part G - 4.6.1 Discover All Characteristics of a Service and 4.6.2
         Discover Characteristics by UUID
@@ -634,12 +649,12 @@ class Client:
         services = [service] if service else self.services
 
         # Perform characteristic discovery for each service
-        discovered_characteristics: List[CharacteristicProxy] = []
+        discovered_characteristics: List[CharacteristicProxy[bytes]] = []
         for service in services:
             starting_handle = service.handle
             ending_handle = service.end_group_handle
 
-            characteristics: List[CharacteristicProxy] = []
+            characteristics: List[CharacteristicProxy[bytes]] = []
             while starting_handle <= ending_handle:
                 response = await self.send_request(
                     ATT_Read_By_Type_Request(
@@ -679,7 +694,7 @@ class Client:
 
                     properties, handle = struct.unpack_from('<BH', attribute_value)
                     characteristic_uuid = UUID.from_bytes(attribute_value[3:])
-                    characteristic = CharacteristicProxy(
+                    characteristic = CharacteristicProxy[bytes](
                         self, handle, 0, characteristic_uuid, properties
                     )
 
@@ -772,7 +787,7 @@ class Client:
 
         return descriptors
 
-    async def discover_attributes(self) -> List[AttributeProxy]:
+    async def discover_attributes(self) -> List[AttributeProxy[bytes]]:
         '''
         Discover all attributes, regardless of type
         '''
@@ -805,7 +820,7 @@ class Client:
                     logger.warning(f'bogus handle value: {attribute_handle}')
                     return []
 
-                attribute = AttributeProxy(
+                attribute = AttributeProxy[bytes](
                     self, attribute_handle, 0, UUID.from_bytes(attribute_uuid)
                 )
                 attributes.append(attribute)
@@ -818,7 +833,7 @@ class Client:
     async def subscribe(
         self,
         characteristic: CharacteristicProxy,
-        subscriber: Optional[Callable[[bytes], Any]] = None,
+        subscriber: Optional[Callable[[Any], Any]] = None,
         prefer_notify: bool = True,
     ) -> None:
         # If we haven't already discovered the descriptors for this characteristic,
@@ -868,7 +883,7 @@ class Client:
     async def unsubscribe(
         self,
         characteristic: CharacteristicProxy,
-        subscriber: Optional[Callable[[bytes], Any]] = None,
+        subscriber: Optional[Callable[[Any], Any]] = None,
         force: bool = False,
     ) -> None:
         '''
@@ -1129,7 +1144,7 @@ class Client:
             if callable(subscriber):
                 subscriber(notification.attribute_value)
             else:
-                subscriber.emit('update', notification.attribute_value)
+                subscriber.emit(subscriber.EVENT_UPDATE, notification.attribute_value)
 
     def on_att_handle_value_indication(self, indication):
         # Call all subscribers
@@ -1144,7 +1159,7 @@ class Client:
             if callable(subscriber):
                 subscriber(indication.attribute_value)
             else:
-                subscriber.emit('update', indication.attribute_value)
+                subscriber.emit(subscriber.EVENT_UPDATE, indication.attribute_value)
 
         # Confirm that we received the indication
         self.send_confirmation(ATT_Handle_Value_Confirmation())

bumble/gatt_server.py

@@ -36,10 +36,8 @@ from typing import (
     Tuple,
     TypeVar,
     Type,
-    Union,
     TYPE_CHECKING,
 )
-from pyee import EventEmitter
 
 from bumble.colors import color
 from bumble.core import UUID
@@ -78,14 +76,13 @@ from bumble.gatt import (
     GATT_REQUEST_TIMEOUT,
     GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
     Characteristic,
-    CharacteristicAdapter,
     CharacteristicDeclaration,
     CharacteristicValue,
     IncludedServiceDeclaration,
     Descriptor,
     Service,
 )
-from bumble.utils import AsyncRunner
+from bumble import utils
 
 if TYPE_CHECKING:
     from bumble.device import Device, Connection
@@ -105,7 +102,7 @@ GATT_SERVER_DEFAULT_MAX_MTU = 517
 # -----------------------------------------------------------------------------
 # GATT Server
 # -----------------------------------------------------------------------------
-class Server(EventEmitter):
+class Server(utils.EventEmitter):
     attributes: List[Attribute]
     services: List[Service]
     attributes_by_handle: Dict[int, Attribute]
@@ -113,6 +110,8 @@ class Server(EventEmitter):
     indication_semaphores: defaultdict[int, asyncio.Semaphore]
     pending_confirmations: defaultdict[int, Optional[asyncio.futures.Future]]
 
+    EVENT_CHARACTERISTIC_SUBSCRIPTION = "characteristic_subscription"
+
     def __init__(self, device: Device) -> None:
         super().__init__()
         self.device = device
@@ -350,10 +349,13 @@ class Server(EventEmitter):
         notify_enabled = value[0] & 0x01 != 0
         indicate_enabled = value[0] & 0x02 != 0
         characteristic.emit(
-            'subscription', connection, notify_enabled, indicate_enabled
+            characteristic.EVENT_SUBSCRIPTION,
+            connection,
+            notify_enabled,
+            indicate_enabled,
         )
         self.emit(
-            'characteristic_subscription',
+            self.EVENT_CHARACTERISTIC_SUBSCRIPTION,
             connection,
             characteristic,
             notify_enabled,
@@ -469,7 +471,7 @@ class Server(EventEmitter):
             finally:
                 self.pending_confirmations[connection.handle] = None
 
-    async def notify_or_indicate_subscribers(
+    async def _notify_or_indicate_subscribers(
         self,
         indicate: bool,
         attribute: Attribute,
@@ -503,7 +505,9 @@ class Server(EventEmitter):
         value: Optional[bytes] = None,
         force: bool = False,
     ):
-        return await self.notify_or_indicate_subscribers(False, attribute, value, force)
+        return await self._notify_or_indicate_subscribers(
+            False, attribute, value, force
+        )
 
     async def indicate_subscribers(
         self,
@@ -511,7 +515,7 @@ class Server(EventEmitter):
         value: Optional[bytes] = None,
         force: bool = False,
     ):
-        return await self.notify_or_indicate_subscribers(True, attribute, value, force)
+        return await self._notify_or_indicate_subscribers(True, attribute, value, force)
 
     def on_disconnection(self, connection: Connection) -> None:
         if connection.handle in self.subscribers:
@@ -662,7 +666,7 @@ class Server(EventEmitter):
 
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_find_by_type_value_request(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.3.3 Find By Type Value Request
@@ -715,7 +719,7 @@ class Server(EventEmitter):
 
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_read_by_type_request(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.4.1 Read By Type Request
@@ -781,7 +785,7 @@ class Server(EventEmitter):
 
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_read_request(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.4.3 Read Request
@@ -807,7 +811,7 @@ class Server(EventEmitter):
             )
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_read_blob_request(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.4.5 Read Blob Request
@@ -852,7 +856,7 @@ class Server(EventEmitter):
             )
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_read_by_group_type_request(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.4.9 Read by Group Type Request
@@ -920,7 +924,7 @@ class Server(EventEmitter):
 
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_write_request(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.5.1 Write Request
@@ -967,7 +971,7 @@ class Server(EventEmitter):
             response = ATT_Write_Response()
         self.send_response(connection, response)
 
-    @AsyncRunner.run_in_task()
+    @utils.AsyncRunner.run_in_task()
     async def on_att_write_command(self, connection, request):
         '''
         See Bluetooth spec Vol 3, Part F - 3.4.5.3 Write Command

bumble/hci.py

@@ -24,21 +24,22 @@ import logging
 import secrets
 import struct
 from typing import Any, Callable, Dict, Iterable, List, Optional, Type, Union, ClassVar
+from typing_extensions import Self
 
 from bumble import crypto
 from bumble.colors import color
 from bumble.core import (
-    BT_BR_EDR_TRANSPORT,
     AdvertisingData,
     DeviceClass,
     InvalidArgumentError,
     InvalidPacketError,
+    PhysicalTransport,
     ProtocolError,
     bit_flags_to_strings,
     name_or_number,
     padded_bytes,
 )
-from bumble.utils import OpenIntEnum
+from bumble import utils
 
 
 # -----------------------------------------------------------------------------
@@ -94,7 +95,7 @@ def map_class_of_device(class_of_device):
     )
 
 
-def phy_list_to_bits(phys: Optional[Iterable[int]]) -> int:
+def phy_list_to_bits(phys: Optional[Iterable[Phy]]) -> int:
     if phys is None:
         return 0
 
@@ -223,6 +224,7 @@ HCI_CONNECTIONLESS_PERIPHERAL_BROADCAST_CHANNEL_MAP_CHANGE_EVENT = 0X55
 HCI_INQUIRY_RESPONSE_NOTIFICATION_EVENT                          = 0X56
 HCI_AUTHENTICATED_PAYLOAD_TIMEOUT_EXPIRED_EVENT                  = 0X57
 HCI_SAM_STATUS_CHANGE_EVENT                                      = 0X58
+HCI_ENCRYPTION_CHANGE_V2_EVENT                                   = 0x59
 
 HCI_VENDOR_EVENT = 0xFF
 
@@ -700,30 +702,22 @@ HCI_ERROR_NAMES[HCI_SUCCESS] = 'HCI_SUCCESS'
 HCI_COMMAND_STATUS_PENDING = 0
 
 
+class Phy(enum.IntEnum):
+    LE_1M    = 1
+    LE_2M    = 2
+    LE_CODED = 3
+
+
 # ACL
 HCI_ACL_PB_FIRST_NON_FLUSHABLE = 0
 HCI_ACL_PB_CONTINUATION        = 1
 HCI_ACL_PB_FIRST_FLUSHABLE     = 2
 HCI_ACK_PB_COMPLETE_L2CAP      = 3
 
-# Roles
+HCI_LE_PHY_NAMES: dict[int,str] = {
-HCI_CENTRAL_ROLE    = 0
+    Phy.LE_1M:    'LE 1M',
-HCI_PERIPHERAL_ROLE = 1
+    Phy.LE_2M:    'LE 2M',
-
+    Phy.LE_CODED: 'LE Coded'
-HCI_ROLE_NAMES = {
-    HCI_CENTRAL_ROLE:    'CENTRAL',
-    HCI_PERIPHERAL_ROLE: 'PERIPHERAL'
-}
-
-# LE PHY Types
-HCI_LE_1M_PHY    = 1
-HCI_LE_2M_PHY    = 2
-HCI_LE_CODED_PHY = 3
-
-HCI_LE_PHY_NAMES = {
-    HCI_LE_1M_PHY:    'LE 1M',
-    HCI_LE_2M_PHY:    'LE 2M',
-    HCI_LE_CODED_PHY: 'LE Coded'
 }
 
 HCI_LE_1M_PHY_BIT    = 0
@@ -732,26 +726,20 @@ HCI_LE_CODED_PHY_BIT = 2
 
 HCI_LE_PHY_BIT_NAMES = ['LE_1M_PHY', 'LE_2M_PHY', 'LE_CODED_PHY']
 
-HCI_LE_PHY_TYPE_TO_BIT = {
+HCI_LE_PHY_TYPE_TO_BIT: dict[Phy, int] = {
-    HCI_LE_1M_PHY:    HCI_LE_1M_PHY_BIT,
+    Phy.LE_1M:    HCI_LE_1M_PHY_BIT,
-    HCI_LE_2M_PHY:    HCI_LE_2M_PHY_BIT,
+    Phy.LE_2M:    HCI_LE_2M_PHY_BIT,
-    HCI_LE_CODED_PHY: HCI_LE_CODED_PHY_BIT
+    Phy.LE_CODED: HCI_LE_CODED_PHY_BIT,
 }
 
 
-class Phy(enum.IntEnum):
-    LE_1M    = HCI_LE_1M_PHY
-    LE_2M    = HCI_LE_2M_PHY
-    LE_CODED = HCI_LE_CODED_PHY
-
-
 class PhyBit(enum.IntFlag):
     LE_1M    = 1 << HCI_LE_1M_PHY_BIT
     LE_2M    = 1 << HCI_LE_2M_PHY_BIT
     LE_CODED = 1 << HCI_LE_CODED_PHY_BIT
 
 
-class CsRole(OpenIntEnum):
+class CsRole(utils.OpenIntEnum):
     INITIATOR = 0x00
     REFLECTOR = 0x01
 
@@ -761,7 +749,7 @@ class CsRoleMask(enum.IntFlag):
     REFLECTOR = 0x02
 
 
-class CsSyncPhy(OpenIntEnum):
+class CsSyncPhy(utils.OpenIntEnum):
     LE_1M     = 1
     LE_2M     = 2
     LE_2M_2BT = 3
@@ -772,7 +760,7 @@ class CsSyncPhySupported(enum.IntFlag):
     LE_2M_2BT = 0x02
 
 
-class RttType(OpenIntEnum):
+class RttType(utils.OpenIntEnum):
     AA_ONLY = 0x00
     SOUNDING_SEQUENCE_32_BIT = 0x01
     SOUNDING_SEQUENCE_96_BIT = 0x02
@@ -782,7 +770,7 @@ class RttType(OpenIntEnum):
     RANDOM_SEQUENCE_128_BIT = 0x06
 
 
-class CsSnr(OpenIntEnum):
+class CsSnr(utils.OpenIntEnum):
     SNR_18_DB = 0x00
     SNR_21_DB = 0x01
     SNR_24_DB = 0x02
@@ -791,6 +779,40 @@ class CsSnr(OpenIntEnum):
     NOT_APPLIED = 0xFF
 
 
+class CsDoneStatus(utils.OpenIntEnum):
+    ALL_RESULTS_COMPLETED = 0x00
+    PARTIAL = 0x01
+    ABORTED = 0x0F
+
+
+class CsProcedureAbortReason(utils.OpenIntEnum):
+    NO_ABORT = 0x00
+    LOCAL_HOST_OR_REMOTE_REQUEST = 0x01
+    CHANNEL_MAP_UPDATE_INSTANT_PASSED = 0x02
+    UNSPECIFIED = 0x0F
+
+
+class CsSubeventAbortReason(utils.OpenIntEnum):
+    NO_ABORT = 0x00
+    LOCAL_HOST_OR_REMOTE_REQUEST = 0x01
+    NO_CS_SYNC_RECEIVED = 0x02
+    SCHEDULING_CONFLICT_OR_LIMITED_RESOURCES = 0x03
+    UNSPECIFIED = 0x0F
+
+class Role(enum.IntEnum):
+    CENTRAL    = 0
+    PERIPHERAL = 1
+
+# For Backward Compatibility.
+HCI_CENTRAL_ROLE    = Role.CENTRAL
+HCI_PERIPHERAL_ROLE = Role.PERIPHERAL
+
+
+HCI_LE_1M_PHY    = Phy.LE_1M
+HCI_LE_2M_PHY    = Phy.LE_2M
+HCI_LE_CODED_PHY = Phy.LE_CODED
+
+
 # Connection Parameters
 HCI_CONNECTION_INTERVAL_MS_PER_UNIT = 1.25
 HCI_CONNECTION_LATENCY_MS_PER_UNIT  = 1.25
@@ -868,10 +890,15 @@ HCI_LINK_TYPE_NAMES = {
 }
 
 # Address types
-HCI_PUBLIC_DEVICE_ADDRESS_TYPE   = 0x00
+class AddressType(utils.OpenIntEnum):
-HCI_RANDOM_DEVICE_ADDRESS_TYPE   = 0x01
+    PUBLIC_DEVICE   = 0x00
-HCI_PUBLIC_IDENTITY_ADDRESS_TYPE = 0x02
+    RANDOM_DEVICE   = 0x01
-HCI_RANDOM_IDENTITY_ADDRESS_TYPE = 0x03
+    PUBLIC_IDENTITY = 0x02
+    RANDOM_IDENTITY = 0x03
+    # (Directed Only) Address is RPA, but controller cannot resolve.
+    UNABLE_TO_RESOLVE = 0xFE
+    # (Extended Only) No address.
+    ANONYMOUS       = 0xFF
 
 # Supported Commands Masks
 # See Bluetooth spec @ 6.27 SUPPORTED COMMANDS
@@ -1212,7 +1239,7 @@ HCI_SUPPORTED_COMMANDS_MASKS = {
 
 # LE Supported Features
 # See Bluetooth spec @ Vol 6, Part B, 4.6 FEATURE SUPPORT
-class LeFeature(OpenIntEnum):
+class LeFeature(utils.OpenIntEnum):
     LE_ENCRYPTION                                  = 0
     CONNECTION_PARAMETERS_REQUEST_PROCEDURE        = 1
     EXTENDED_REJECT_INDICATION                     = 2
@@ -1510,7 +1537,7 @@ RTT_TYPE_SPEC = {'size': 1, 'mapper': lambda x: RttType(x).name}
 CS_SNR_SPEC = {'size': 1, 'mapper': lambda x: CsSnr(x).name}
 
 
-class CodecID(OpenIntEnum):
+class CodecID(utils.OpenIntEnum):
     # fmt: off
     U_LOG           = 0x00
     A_LOG           = 0x01
@@ -1561,8 +1588,8 @@ class HCI_Constant:
         return HCI_ERROR_NAMES.get(status, f'0x{status:02X}')
 
     @staticmethod
-    def role_name(role):
+    def role_name(role: int) -> str:
-        return HCI_ROLE_NAMES.get(role, str(role))
+        return Role(role).name
 
     @staticmethod
     def le_phy_name(phy):
@@ -1928,17 +1955,10 @@ class Address:
     address[0] is the LSB of the address, address[5] is the MSB.
     '''
 
-    PUBLIC_DEVICE_ADDRESS = 0x00
+    PUBLIC_DEVICE_ADDRESS = AddressType.PUBLIC_DEVICE
-    RANDOM_DEVICE_ADDRESS = 0x01
+    RANDOM_DEVICE_ADDRESS = AddressType.RANDOM_DEVICE
-    PUBLIC_IDENTITY_ADDRESS = 0x02
+    PUBLIC_IDENTITY_ADDRESS = AddressType.PUBLIC_IDENTITY
-    RANDOM_IDENTITY_ADDRESS = 0x03
+    RANDOM_IDENTITY_ADDRESS = AddressType.RANDOM_IDENTITY
-
-    ADDRESS_TYPE_NAMES = {
-        PUBLIC_DEVICE_ADDRESS: 'PUBLIC_DEVICE_ADDRESS',
-        RANDOM_DEVICE_ADDRESS: 'RANDOM_DEVICE_ADDRESS',
-        PUBLIC_IDENTITY_ADDRESS: 'PUBLIC_IDENTITY_ADDRESS',
-        RANDOM_IDENTITY_ADDRESS: 'RANDOM_IDENTITY_ADDRESS',
-    }
 
     # Type declarations
     NIL: Address
@@ -1948,40 +1968,44 @@ class Address:
     # pylint: disable-next=unnecessary-lambda
     ADDRESS_TYPE_SPEC = {'size': 1, 'mapper': lambda x: Address.address_type_name(x)}
 
-    @staticmethod
+    @classmethod
-    def address_type_name(address_type):
+    def address_type_name(cls: type[Self], address_type: int) -> str:
-        return name_or_number(Address.ADDRESS_TYPE_NAMES, address_type)
+        return AddressType(address_type).name
 
-    @staticmethod
+    @classmethod
-    def from_string_for_transport(string, transport):
+    def from_string_for_transport(
-        if transport == BT_BR_EDR_TRANSPORT:
+        cls: type[Self], string: str, transport: PhysicalTransport
+    ) -> Self:
+        if transport == PhysicalTransport.BR_EDR:
             address_type = Address.PUBLIC_DEVICE_ADDRESS
         else:
             address_type = Address.RANDOM_DEVICE_ADDRESS
-        return Address(string, address_type)
+        return cls(string, address_type)
 
-    @staticmethod
+    @classmethod
-    def parse_address(data, offset):
+    def parse_address(cls: type[Self], data: bytes, offset: int) -> tuple[int, Self]:
         # Fix the type to a default value. This is used for parsing type-less Classic
         # addresses
-        return Address.parse_address_with_type(
+        return cls.parse_address_with_type(data, offset, Address.PUBLIC_DEVICE_ADDRESS)
-            data, offset, Address.PUBLIC_DEVICE_ADDRESS
-        )
 
-    @staticmethod
+    @classmethod
-    def parse_random_address(data, offset):
+    def parse_random_address(
-        return Address.parse_address_with_type(
+        cls: type[Self], data: bytes, offset: int
-            data, offset, Address.RANDOM_DEVICE_ADDRESS
+    ) -> tuple[int, Self]:
-        )
+        return cls.parse_address_with_type(data, offset, Address.RANDOM_DEVICE_ADDRESS)
 
-    @staticmethod
+    @classmethod
-    def parse_address_with_type(data, offset, address_type):
+    def parse_address_with_type(
-        return offset + 6, Address(data[offset : offset + 6], address_type)
+        cls: type[Self], data: bytes, offset: int, address_type: AddressType
+    ) -> tuple[int, Self]:
+        return offset + 6, cls(data[offset : offset + 6], address_type)
 
-    @staticmethod
+    @classmethod
-    def parse_address_preceded_by_type(data, offset):
+    def parse_address_preceded_by_type(
-        address_type = data[offset - 1]
+        cls: type[Self], data: bytes, offset: int
-        return Address.parse_address_with_type(data, offset, address_type)
+    ) -> tuple[int, Self]:
+        address_type = AddressType(data[offset - 1])
+        return cls.parse_address_with_type(data, offset, address_type)
 
     @classmethod
     def generate_static_address(cls) -> Address:
@@ -2021,8 +2045,10 @@ class Address:
         )
 
     def __init__(
-        self, address: Union[bytes, str], address_type: int = RANDOM_DEVICE_ADDRESS
+        self,
-    ):
+        address: Union[bytes, str],
+        address_type: AddressType = RANDOM_DEVICE_ADDRESS,
+    ) -> None:
         '''
         Initialize an instance. `address` may be a byte array in little-endian
         format, or a hex string in big-endian format (with optional ':'
@@ -3338,6 +3364,20 @@ class HCI_Set_Event_Mask_Page_2_Command(HCI_Command):
     See Bluetooth spec @ 7.3.69 Set Event Mask Page 2 Command
     '''
 
+    @staticmethod
+    def mask(event_codes: Iterable[int]) -> bytes:
+        '''
+        Compute the event mask value for a list of events.
+        '''
+        # NOTE: this implementation takes advantage of the fact that as of version 6.0
+        # of the core specification, the bit number for each event code is equal to 64
+        # less than the event code.
+        # If future versions of the specification deviate from that, a different
+        # implementation would be needed.
+        return sum((1 << event_code - 64) for event_code in event_codes).to_bytes(
+            8, 'little'
+        )
+
 
 # -----------------------------------------------------------------------------
 @HCI_Command.command(
@@ -4857,6 +4897,76 @@ class HCI_LE_Periodic_Advertising_Sync_Transfer_Command(HCI_Command):
     '''
 
 
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[('connection_handle', 2), ('service_data', 2), ('advertising_handle', 1)],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        ('connection_handle', 2),
+    ],
+)
+class HCI_LE_Periodic_Advertising_Set_Info_Transfer_Command(HCI_Command):
+    '''
+    See Bluetooth spec @ 7.8.90 LE Periodic Advertising Set Info Transfer Command
+    '''
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[
+        ('connection_handle', 2),
+        ('mode', 1),
+        ('skip', 2),
+        ('sync_timeout', 2),
+        (
+            'cte_type',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_LE_Periodic_Advertising_Report_Event.CteType(
+                    x
+                ).name,
+            },
+        ),
+    ],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+        ('connection_handle', 2),
+    ],
+)
+class HCI_LE_Set_Periodic_Advertising_Sync_Transfer_Parameters_Command(HCI_Command):
+    '''
+    See Bluetooth spec @ 7.8.91 LE Set Periodic Advertising Sync Transfer Parameters command
+    '''
+
+
+# -----------------------------------------------------------------------------
+@HCI_Command.command(
+    fields=[
+        ('mode', 1),
+        ('skip', 2),
+        ('sync_timeout', 2),
+        (
+            'cte_type',
+            {
+                'size': 1,
+                'mapper': lambda x: HCI_LE_Periodic_Advertising_Report_Event.CteType(
+                    x
+                ).name,
+            },
+        ),
+    ],
+    return_parameters_fields=[
+        ('status', STATUS_SPEC),
+    ],
+)
+class HCI_LE_Set_Default_Periodic_Advertising_Sync_Transfer_Parameters_Command(
+    HCI_Command
+):
+    '''
+    See Bluetooth spec @ 7.8.92 LE Set Default Periodic Advertising Sync Transfer Parameters command
+    '''
+
+
 # -----------------------------------------------------------------------------
 @HCI_Command.command(
     fields=[
@@ -5274,11 +5384,11 @@ class HCI_LE_CS_Create_Config_Command(HCI_Command):
     See Bluetooth spec @ 7.8.137 LE CS Create Config command
     '''
 
-    class ChannelSelectionType(OpenIntEnum):
+    class ChannelSelectionType(utils.OpenIntEnum):
         ALGO_3B = 0
         ALGO_3C = 1
 
-    class Ch3cShape(OpenIntEnum):
+    class Ch3cShape(utils.OpenIntEnum):
         HAT = 0x00
         X = 0x01
 
@@ -5729,12 +5839,18 @@ class HCI_LE_Advertising_Report_Event(HCI_LE_Meta_Event):
             return HCI_LE_Advertising_Report_Event.event_type_name(self.event_type)
 
         def to_string(self, indentation='', _=None):
+            def data_to_str(data):
+                try:
+                    return data.hex() + ': ' + str(AdvertisingData.from_bytes(data))
+                except Exception:
+                    return data.hex()
+
             return super().to_string(
                 indentation,
                 {
                     'event_type': HCI_LE_Advertising_Report_Event.event_type_name,
                     'address_type': Address.address_type_name,
-                    'data': lambda x: str(AdvertisingData.from_bytes(x)),
+                    'data': data_to_str,
                 },
             )
 
@@ -5869,6 +5985,33 @@ class HCI_LE_Enhanced_Connection_Complete_Event(HCI_LE_Meta_Event):
     '''
 
 
+# -----------------------------------------------------------------------------
+@HCI_LE_Meta_Event.event(
+    [
+        ('status', STATUS_SPEC),
+        ('connection_handle', 2),
+        (
+            'role',
+            {'size': 1, 'mapper': lambda x: 'CENTRAL' if x == 0 else 'PERIPHERAL'},
+        ),
+        ('peer_address_type', Address.ADDRESS_TYPE_SPEC),
+        ('peer_address', Address.parse_address_preceded_by_type),
+        ('local_resolvable_private_address', Address.parse_random_address),
+        ('peer_resolvable_private_address', Address.parse_random_address),
+        ('connection_interval', 2),
+        ('peripheral_latency', 2),
+        ('supervision_timeout', 2),
+        ('central_clock_accuracy', 1),
+        ('advertising_handle', 1),
+        ('sync_handle', 2),
+    ]
+)
+class HCI_LE_Enhanced_Connection_Complete_V2_Event(HCI_LE_Meta_Event):
+    '''
+    See Bluetooth spec @ 7.7.65.10 LE Enhanced Connection Complete Event
+    '''
+
+
 # -----------------------------------------------------------------------------
 @HCI_LE_Meta_Event.event(
     [
@@ -5959,12 +6102,18 @@ class HCI_LE_Extended_Advertising_Report_Event(HCI_LE_Meta_Event):
 
         def to_string(self, indentation='', _=None):
             # pylint: disable=line-too-long
+            def data_to_str(data):
+                try:
+                    return data.hex() + ': ' + str(AdvertisingData.from_bytes(data))
+                except Exception:
+                    return data.hex()
+
             return super().to_string(
                 indentation,
                 {
                     'event_type': HCI_LE_Extended_Advertising_Report_Event.event_type_string,
                     'address_type': Address.address_type_name,
-                    'data': lambda x: str(AdvertisingData.from_bytes(x)),
+                    'data': data_to_str,
                 },
             )
 
@@ -6107,13 +6256,13 @@ class HCI_LE_Periodic_Advertising_Report_Event(HCI_LE_Meta_Event):
     TX_POWER_INFORMATION_NOT_AVAILABLE = 0x7F
     RSSI_NOT_AVAILABLE = 0x7F
 
-    class CteType(OpenIntEnum):
+    class CteType(utils.OpenIntEnum):
         AOA_CONSTANT_TONE_EXTENSION = 0x00
         AOD_CONSTANT_TONE_EXTENSION_1US = 0x01
         AOD_CONSTANT_TONE_EXTENSION_2US = 0x02
         NO_CONSTANT_TONE_EXTENSION = 0xFF
 
-    class DataStatus(OpenIntEnum):
+    class DataStatus(utils.OpenIntEnum):
         DATA_COMPLETE = 0x00
         DATA_INCOMPLETE_MORE_TO_COME = 0x01
         DATA_INCOMPLETE_TRUNCATED_NO_MORE_TO_COME = 0x02
@@ -6210,6 +6359,31 @@ class HCI_LE_Periodic_Advertising_Sync_Transfer_Received_Event(HCI_LE_Meta_Event
     '''
 
 
+# -----------------------------------------------------------------------------
+@HCI_LE_Meta_Event.event(
+    [
+        ('status', STATUS_SPEC),
+        ('connection_handle', 2),
+        ('service_data', 2),
+        ('sync_handle', 2),
+        ('advertising_sid', 1),
+        ('advertiser_address_type', Address.ADDRESS_TYPE_SPEC),
+        ('advertiser_address', Address.parse_address_preceded_by_type),
+        ('advertiser_phy', 1),
+        ('periodic_advertising_interval', 2),
+        ('advertiser_clock_accuracy', 1),
+        ('num_subevents', 1),
+        ('subevent_interval', 1),
+        ('response_slot_delay', 1),
+        ('response_slot_spacing', 1),
+    ]
+)
+class HCI_LE_Periodic_Advertising_Sync_Transfer_Received_V2_Event(HCI_LE_Meta_Event):
+    '''
+    See Bluetooth spec @ 7.7.65.24 LE Periodic Advertising Sync Transfer Received Event
+    '''
+
+
 # -----------------------------------------------------------------------------
 @HCI_LE_Meta_Event.event(
     [
@@ -6469,7 +6643,7 @@ class HCI_LE_CS_Config_Complete_Event(HCI_LE_Meta_Event):
     See Bluetooth spec @ 7.7.65.42 LE CS Config Complete event
     '''
 
-    class Action(OpenIntEnum):
+    class Action(utils.OpenIntEnum):
         REMOVED = 0
         CREATED = 1
 
@@ -6506,7 +6680,7 @@ class HCI_LE_CS_Config_Complete_Event(HCI_LE_Meta_Event):
         ('config_id', 1),
         ('state', 1),
         ('tone_antenna_config_selection', 1),
-        ('selected_tx_power', 1),
+        ('selected_tx_power', -1),
         ('subevent_len', 3),
         ('subevents_per_event', 1),
         ('subevent_interval', 2),
@@ -6521,7 +6695,7 @@ class HCI_LE_CS_Procedure_Enable_Complete_Event(HCI_LE_Meta_Event):
     See Bluetooth spec @ 7.7.65.43 LE CS Procedure Enable Complete event
     '''
 
-    class State(OpenIntEnum):
+    class State(utils.OpenIntEnum):
         DISABLED = 0
         ENABLED = 1
 
@@ -6548,7 +6722,7 @@ class HCI_LE_CS_Procedure_Enable_Complete_Event(HCI_LE_Meta_Event):
         ('start_acl_conn_event_counter', 2),
         ('procedure_counter', 2),
         ('frequency_compensation', 2),
-        ('reference_power_level', 1),
+        ('reference_power_level', -1),
         ('procedure_done_status', 1),
         ('subevent_done_status', 1),
         ('abort_reason', 1),
@@ -6565,7 +6739,7 @@ class HCI_LE_CS_Subevent_Result_Event(HCI_LE_Meta_Event):
     See Bluetooth spec @ 7.7.65.44 LE CS Subevent Result event
     '''
 
-    status: int
+    connection_handle: int
     config_id: int
     start_acl_conn_event_counter: int
     procedure_counter: int
@@ -6601,7 +6775,7 @@ class HCI_LE_CS_Subevent_Result_Continue_Event(HCI_LE_Meta_Event):
     See Bluetooth spec @ 7.7.65.45 LE CS Subevent Result Continue event
     '''
 
-    status: int
+    connection_handle: int
     config_id: int
     procedure_done_status: int
     subevent_done_status: int
@@ -6817,6 +6991,30 @@ class HCI_Encryption_Change_Event(HCI_Event):
         )
 
 
+# -----------------------------------------------------------------------------
+@HCI_Event.event(
+    [
+        ('status', STATUS_SPEC),
+        ('connection_handle', 2),
+        (
+            'encryption_enabled',
+            {
+                'size': 1,
+                # pylint: disable-next=unnecessary-lambda
+                'mapper': lambda x: HCI_Encryption_Change_Event.encryption_enabled_name(
+                    x
+                ),
+            },
+        ),
+        ('encryption_key_size', 1),
+    ]
+)
+class HCI_Encryption_Change_V2_Event(HCI_Event):
+    '''
+    See Bluetooth spec @ 7.7.8 Encryption Change Event
+    '''
+
+
 # -----------------------------------------------------------------------------
 @HCI_Event.event(
     [('status', STATUS_SPEC), ('connection_handle', 2), ('lmp_features', 8)]
@@ -6863,7 +7061,7 @@ class HCI_QOS_Setup_Complete_Event(HCI_Event):
     See Bluetooth spec @ 7.7.13 QoS Setup Complete Event
     '''
 
-    class ServiceType(OpenIntEnum):
+    class ServiceType(utils.OpenIntEnum):
         NO_TRAFFIC_AVAILABLE = 0x00
         BEST_EFFORT_AVAILABLE = 0x01
         GUARANTEED_AVAILABLE = 0x02

bumble/hfp.py

@@ -24,7 +24,6 @@ import asyncio
 import dataclasses
 import enum
 import traceback
-import pyee
 import re
 from typing import (
     Dict,
@@ -45,6 +44,7 @@ from bumble import at
 from bumble import device
 from bumble import rfcomm
 from bumble import sdp
+from bumble import utils
 from bumble.colors import color
 from bumble.core import (
     ProtocolError,
@@ -690,7 +690,7 @@ class HfIndicatorState:
     current_status: int = 0
 
 
-class HfProtocol(pyee.EventEmitter):
+class HfProtocol(utils.EventEmitter):
     """
     Implementation for the Hands-Free side of the Hands-Free profile.
 
@@ -720,6 +720,14 @@ class HfProtocol(pyee.EventEmitter):
                 vrec: VoiceRecognitionState
     """
 
+    EVENT_CODEC_NEGOTIATION = "codec_negotiation"
+    EVENT_AG_INDICATOR = "ag_indicator"
+    EVENT_SPEAKER_VOLUME = "speaker_volume"
+    EVENT_MICROPHONE_VOLUME = "microphone_volume"
+    EVENT_RING = "ring"
+    EVENT_CLI_NOTIFICATION = "cli_notification"
+    EVENT_VOICE_RECOGNITION = "voice_recognition"
+
     class HfLoopTermination(HfpProtocolError):
         """Termination signal for run() loop."""
 
@@ -777,7 +785,8 @@ class HfProtocol(pyee.EventEmitter):
         self.dlc.sink = self._read_at
         # Stop the run() loop when L2CAP is closed.
         self.dlc.multiplexer.l2cap_channel.on(
-            'close', lambda: self.unsolicited_queue.put_nowait(None)
+            self.dlc.multiplexer.l2cap_channel.EVENT_CLOSE,
+            lambda: self.unsolicited_queue.put_nowait(None),
         )
 
     def supports_hf_feature(self, feature: HfFeature) -> bool:
@@ -1034,7 +1043,7 @@ class HfProtocol(pyee.EventEmitter):
         # ID. The HF shall be ready to accept the synchronous connection
         # establishment as soon as it has sent the AT commands AT+BCS=<Codec ID>.
         self.active_codec = AudioCodec(codec_id)
-        self.emit('codec_negotiation', self.active_codec)
+        self.emit(self.EVENT_CODEC_NEGOTIATION, self.active_codec)
 
         logger.info("codec connection setup completed")
 
@@ -1095,7 +1104,7 @@ class HfProtocol(pyee.EventEmitter):
         # CIEV is in 1-index, while ag_indicators is in 0-index.
         ag_indicator = self.ag_indicators[index - 1]
         ag_indicator.current_status = value
-        self.emit('ag_indicator', ag_indicator)
+        self.emit(self.EVENT_AG_INDICATOR, ag_indicator)
         logger.info(f"AG indicator updated: {ag_indicator.indicator}, {value}")
 
     async def handle_unsolicited(self):
@@ -1110,19 +1119,21 @@ class HfProtocol(pyee.EventEmitter):
                 int(result.parameters[0]), int(result.parameters[1])
             )
         elif result.code == "+VGS":
-            self.emit('speaker_volume', int(result.parameters[0]))
+            self.emit(self.EVENT_SPEAKER_VOLUME, int(result.parameters[0]))
         elif result.code == "+VGM":
-            self.emit('microphone_volume', int(result.parameters[0]))
+            self.emit(self.EVENT_MICROPHONE_VOLUME, int(result.parameters[0]))
         elif result.code == "RING":
-            self.emit('ring')
+            self.emit(self.EVENT_RING)
         elif result.code == "+CLIP":
             self.emit(
-                'cli_notification', CallLineIdentification.parse_from(result.parameters)
+                self.EVENT_CLI_NOTIFICATION,
+                CallLineIdentification.parse_from(result.parameters),
             )
         elif result.code == "+BVRA":
             # TODO: Support Enhanced Voice Recognition.
             self.emit(
-                'voice_recognition', VoiceRecognitionState(int(result.parameters[0]))
+                self.EVENT_VOICE_RECOGNITION,
+                VoiceRecognitionState(int(result.parameters[0])),
             )
         else:
             logging.info(f"unhandled unsolicited response {result.code}")
@@ -1146,7 +1157,7 @@ class HfProtocol(pyee.EventEmitter):
             logger.error(traceback.format_exc())
 
 
-class AgProtocol(pyee.EventEmitter):
+class AgProtocol(utils.EventEmitter):
     """
     Implementation for the Audio-Gateway side of the Hands-Free profile.
 
@@ -1179,6 +1190,19 @@ class AgProtocol(pyee.EventEmitter):
                 volume: Int
     """
 
+    EVENT_SLC_COMPLETE = "slc_complete"
+    EVENT_SUPPORTED_AUDIO_CODECS = "supported_audio_codecs"
+    EVENT_CODEC_NEGOTIATION = "codec_negotiation"
+    EVENT_VOICE_RECOGNITION = "voice_recognition"
+    EVENT_CALL_HOLD = "call_hold"
+    EVENT_HF_INDICATOR = "hf_indicator"
+    EVENT_CODEC_CONNECTION_REQUEST = "codec_connection_request"
+    EVENT_ANSWER = "answer"
+    EVENT_DIAL = "dial"
+    EVENT_HANG_UP = "hang_up"
+    EVENT_SPEAKER_VOLUME = "speaker_volume"
+    EVENT_MICROPHONE_VOLUME = "microphone_volume"
+
     supported_hf_features: int
     supported_hf_indicators: Set[HfIndicator]
     supported_audio_codecs: List[AudioCodec]
@@ -1371,7 +1395,7 @@ class AgProtocol(pyee.EventEmitter):
 
     def _check_remained_slc_commands(self) -> None:
         if not self._remained_slc_setup_features:
-            self.emit('slc_complete')
+            self.emit(self.EVENT_SLC_COMPLETE)
 
     def _on_brsf(self, hf_features: bytes) -> None:
         self.supported_hf_features = int(hf_features)
@@ -1390,17 +1414,17 @@ class AgProtocol(pyee.EventEmitter):
 
     def _on_bac(self, *args) -> None:
         self.supported_audio_codecs = [AudioCodec(int(value)) for value in args]
-        self.emit('supported_audio_codecs', self.supported_audio_codecs)
+        self.emit(self.EVENT_SUPPORTED_AUDIO_CODECS, self.supported_audio_codecs)
         self.send_ok()
 
     def _on_bcs(self, codec: bytes) -> None:
         self.active_codec = AudioCodec(int(codec))
         self.send_ok()
-        self.emit('codec_negotiation', self.active_codec)
+        self.emit(self.EVENT_CODEC_NEGOTIATION, self.active_codec)
 
     def _on_bvra(self, vrec: bytes) -> None:
         self.send_ok()
-        self.emit('voice_recognition', VoiceRecognitionState(int(vrec)))
+        self.emit(self.EVENT_VOICE_RECOGNITION, VoiceRecognitionState(int(vrec)))
 
     def _on_chld(self, operation_code: bytes) -> None:
         call_index: Optional[int] = None
@@ -1427,7 +1451,7 @@ class AgProtocol(pyee.EventEmitter):
         # Real three-way calls have more complicated situations, but this is not a popular issue - let users to handle the remaining :)
 
         self.send_ok()
-        self.emit('call_hold', operation, call_index)
+        self.emit(self.EVENT_CALL_HOLD, operation, call_index)
 
     def _on_chld_test(self) -> None:
         if not self.supports_ag_feature(AgFeature.THREE_WAY_CALLING):
@@ -1553,7 +1577,7 @@ class AgProtocol(pyee.EventEmitter):
             return
 
         self.hf_indicators[index].current_status = int(value_bytes)
-        self.emit('hf_indicator', self.hf_indicators[index])
+        self.emit(self.EVENT_HF_INDICATOR, self.hf_indicators[index])
         self.send_ok()
 
     def _on_bia(self, *args) -> None:
@@ -1562,21 +1586,21 @@ class AgProtocol(pyee.EventEmitter):
         self.send_ok()
 
     def _on_bcc(self) -> None:
-        self.emit('codec_connection_request')
+        self.emit(self.EVENT_CODEC_CONNECTION_REQUEST)
         self.send_ok()
 
     def _on_a(self) -> None:
         """ATA handler."""
-        self.emit('answer')
+        self.emit(self.EVENT_ANSWER)
         self.send_ok()
 
     def _on_d(self, number: bytes) -> None:
         """ATD handler."""
-        self.emit('dial', number.decode())
+        self.emit(self.EVENT_DIAL, number.decode())
         self.send_ok()
 
     def _on_chup(self) -> None:
-        self.emit('hang_up')
+        self.emit(self.EVENT_HANG_UP)
         self.send_ok()
 
     def _on_clcc(self) -> None:
@@ -1602,11 +1626,11 @@ class AgProtocol(pyee.EventEmitter):
         self.send_ok()
 
     def _on_vgs(self, level: bytes) -> None:
-        self.emit('speaker_volume', int(level))
+        self.emit(self.EVENT_SPEAKER_VOLUME, int(level))
         self.send_ok()
 
     def _on_vgm(self, level: bytes) -> None:
-        self.emit('microphone_volume', int(level))
+        self.emit(self.EVENT_MICROPHONE_VOLUME, int(level))
         self.send_ok()
 
 

bumble/hid.py

@@ -22,11 +22,12 @@ import enum
 import struct
 
 from abc import ABC, abstractmethod
-from pyee import EventEmitter
 from typing import Optional, Callable
 from typing_extensions import override
 
-from bumble import l2cap, device
+from bumble import l2cap
+from bumble import device
+from bumble import utils
 from bumble.core import InvalidStateError, ProtocolError
 from bumble.hci import Address
 
@@ -195,11 +196,18 @@ class SendHandshakeMessage(Message):
 
 
 # -----------------------------------------------------------------------------
-class HID(ABC, EventEmitter):
+class HID(ABC, utils.EventEmitter):
     l2cap_ctrl_channel: Optional[l2cap.ClassicChannel] = None
     l2cap_intr_channel: Optional[l2cap.ClassicChannel] = None
     connection: Optional[device.Connection] = None
 
+    EVENT_INTERRUPT_DATA = "interrupt_data"
+    EVENT_CONTROL_DATA = "control_data"
+    EVENT_SUSPEND = "suspend"
+    EVENT_EXIT_SUSPEND = "exit_suspend"
+    EVENT_VIRTUAL_CABLE_UNPLUG = "virtual_cable_unplug"
+    EVENT_HANDSHAKE = "handshake"
+
     class Role(enum.IntEnum):
         HOST = 0x00
         DEVICE = 0x01
@@ -214,7 +222,7 @@ class HID(ABC, EventEmitter):
         device.register_l2cap_server(HID_CONTROL_PSM, self.on_l2cap_connection)
         device.register_l2cap_server(HID_INTERRUPT_PSM, self.on_l2cap_connection)
 
-        device.on('connection', self.on_device_connection)
+        device.on(device.EVENT_CONNECTION, self.on_device_connection)
 
     async def connect_control_channel(self) -> None:
         # Create a new L2CAP connection - control channel
@@ -257,15 +265,20 @@ class HID(ABC, EventEmitter):
     def on_device_connection(self, connection: device.Connection) -> None:
         self.connection = connection
         self.remote_device_bd_address = connection.peer_address
-        connection.on('disconnection', self.on_device_disconnection)
+        connection.on(connection.EVENT_DISCONNECTION, self.on_device_disconnection)
 
     def on_device_disconnection(self, reason: int) -> None:
         self.connection = None
 
     def on_l2cap_connection(self, l2cap_channel: l2cap.ClassicChannel) -> None:
         logger.debug(f'+++ New L2CAP connection: {l2cap_channel}')
-        l2cap_channel.on('open', lambda: self.on_l2cap_channel_open(l2cap_channel))
+        l2cap_channel.on(
-        l2cap_channel.on('close', lambda: self.on_l2cap_channel_close(l2cap_channel))
+            l2cap_channel.EVENT_OPEN, lambda: self.on_l2cap_channel_open(l2cap_channel)
+        )
+        l2cap_channel.on(
+            l2cap_channel.EVENT_CLOSE,
+            lambda: self.on_l2cap_channel_close(l2cap_channel),
+        )
 
     def on_l2cap_channel_open(self, l2cap_channel: l2cap.ClassicChannel) -> None:
         if l2cap_channel.psm == HID_CONTROL_PSM:
@@ -289,7 +302,7 @@ class HID(ABC, EventEmitter):
 
     def on_intr_pdu(self, pdu: bytes) -> None:
         logger.debug(f'<<< HID INTERRUPT PDU: {pdu.hex()}')
-        self.emit("interrupt_data", pdu)
+        self.emit(self.EVENT_INTERRUPT_DATA, pdu)
 
     def send_pdu_on_ctrl(self, msg: bytes) -> None:
         assert self.l2cap_ctrl_channel
@@ -362,17 +375,17 @@ class Device(HID):
             self.handle_set_protocol(pdu)
         elif message_type == Message.MessageType.DATA:
             logger.debug('<<< HID CONTROL DATA')
-            self.emit('control_data', pdu)
+            self.emit(self.EVENT_CONTROL_DATA, pdu)
         elif message_type == Message.MessageType.CONTROL:
             if param == Message.ControlCommand.SUSPEND:
                 logger.debug('<<< HID SUSPEND')
-                self.emit('suspend')
+                self.emit(self.EVENT_SUSPEND)
             elif param == Message.ControlCommand.EXIT_SUSPEND:
                 logger.debug('<<< HID EXIT SUSPEND')
-                self.emit('exit_suspend')
+                self.emit(self.EVENT_EXIT_SUSPEND)
             elif param == Message.ControlCommand.VIRTUAL_CABLE_UNPLUG:
                 logger.debug('<<< HID VIRTUAL CABLE UNPLUG')
-                self.emit('virtual_cable_unplug')
+                self.emit(self.EVENT_VIRTUAL_CABLE_UNPLUG)
             else:
                 logger.debug('<<< HID CONTROL OPERATION UNSUPPORTED')
         else:
@@ -537,14 +550,14 @@ class Host(HID):
         message_type = pdu[0] >> 4
         if message_type == Message.MessageType.HANDSHAKE:
             logger.debug(f'<<< HID HANDSHAKE: {Message.Handshake(param).name}')
-            self.emit('handshake', Message.Handshake(param))
+            self.emit(self.EVENT_HANDSHAKE, Message.Handshake(param))
         elif message_type == Message.MessageType.DATA:
             logger.debug('<<< HID CONTROL DATA')
-            self.emit('control_data', pdu)
+            self.emit(self.EVENT_CONTROL_DATA, pdu)
         elif message_type == Message.MessageType.CONTROL:
             if param == Message.ControlCommand.VIRTUAL_CABLE_UNPLUG:
                 logger.debug('<<< HID VIRTUAL CABLE UNPLUG')
-                self.emit('virtual_cable_unplug')
+                self.emit(self.EVENT_VIRTUAL_CABLE_UNPLUG)
             else:
                 logger.debug('<<< HID CONTROL OPERATION UNSUPPORTED')
         else:

bumble/host.py

@@ -34,7 +34,6 @@ from typing import (
     TYPE_CHECKING,
 )
 
-import pyee
 
 from bumble.colors import color
 from bumble.l2cap import L2CAP_PDU
@@ -42,16 +41,16 @@ from bumble.snoop import Snooper
 from bumble import drivers
 from bumble import hci
 from bumble.core import (
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
-    BT_LE_TRANSPORT,
+    PhysicalTransport,
     ConnectionPHY,
     ConnectionParameters,
 )
-from bumble.utils import AbortableEventEmitter
+from bumble import utils
 from bumble.transport.common import TransportLostError
 
 if TYPE_CHECKING:
-    from .transport.common import TransportSink, TransportSource
+    from bumble.transport.common import TransportSink, TransportSource
 
 
 # -----------------------------------------------------------------------------
@@ -61,7 +60,7 @@ logger = logging.getLogger(__name__)
 
 
 # -----------------------------------------------------------------------------
-class DataPacketQueue(pyee.EventEmitter):
+class DataPacketQueue(utils.EventEmitter):
     """
     Flow-control queue for host->controller data packets (ACL, ISO).
 
@@ -186,7 +185,11 @@ class DataPacketQueue(pyee.EventEmitter):
 # -----------------------------------------------------------------------------
 class Connection:
     def __init__(
-        self, host: Host, handle: int, peer_address: hci.Address, transport: int
+        self,
+        host: Host,
+        handle: int,
+        peer_address: hci.Address,
+        transport: PhysicalTransport,
     ):
         self.host = host
         self.handle = handle
@@ -195,7 +198,7 @@ class Connection:
         self.transport = transport
         acl_packet_queue: Optional[DataPacketQueue] = (
             host.le_acl_packet_queue
-            if transport == BT_LE_TRANSPORT
+            if transport == PhysicalTransport.LE
             else host.acl_packet_queue
         )
         assert acl_packet_queue
@@ -230,12 +233,12 @@ class IsoLink:
 
 
 # -----------------------------------------------------------------------------
-class Host(AbortableEventEmitter):
+class Host(utils.EventEmitter):
     connections: Dict[int, Connection]
     cis_links: Dict[int, IsoLink]
     bis_links: Dict[int, IsoLink]
     sco_links: Dict[int, ScoLink]
-    bigs: dict[int, set[int]] = {}  # BIG Handle to BIS Handles
+    bigs: dict[int, set[int]]
     acl_packet_queue: Optional[DataPacketQueue] = None
     le_acl_packet_queue: Optional[DataPacketQueue] = None
     iso_packet_queue: Optional[DataPacketQueue] = None
@@ -259,6 +262,7 @@ class Host(AbortableEventEmitter):
         self.cis_links = {}  # CIS links, by connection handle
         self.bis_links = {}  # BIS links, by connection handle
         self.sco_links = {}  # SCO links, by connection handle
+        self.bigs = {}  # BIG Handle to BIS Handles
         self.pending_command = None
         self.pending_response: Optional[asyncio.Future[Any]] = None
         self.number_of_supported_advertising_sets = 0
@@ -431,6 +435,14 @@ class Host(AbortableEventEmitter):
                 )
             )
         )
+        if self.supports_command(hci.HCI_SET_EVENT_MASK_PAGE_2_COMMAND):
+            await self.send_command(
+                hci.HCI_Set_Event_Mask_Page_2_Command(
+                    event_mask_page_2=hci.HCI_Set_Event_Mask_Page_2_Command.mask(
+                        [hci.HCI_ENCRYPTION_CHANGE_V2_EVENT]
+                    )
+                )
+            )
 
         if (
             self.local_version is not None
@@ -452,6 +464,7 @@ class Host(AbortableEventEmitter):
                     hci.HCI_LE_READ_LOCAL_P_256_PUBLIC_KEY_COMPLETE_EVENT,
                     hci.HCI_LE_GENERATE_DHKEY_COMPLETE_EVENT,
                     hci.HCI_LE_ENHANCED_CONNECTION_COMPLETE_EVENT,
+                    hci.HCI_LE_ENHANCED_CONNECTION_COMPLETE_V2_EVENT,
                     hci.HCI_LE_DIRECTED_ADVERTISING_REPORT_EVENT,
                     hci.HCI_LE_PHY_UPDATE_COMPLETE_EVENT,
                     hci.HCI_LE_EXTENDED_ADVERTISING_REPORT_EVENT,
@@ -476,6 +489,12 @@ class Host(AbortableEventEmitter):
                     hci.HCI_LE_TRANSMIT_POWER_REPORTING_EVENT,
                     hci.HCI_LE_BIGINFO_ADVERTISING_REPORT_EVENT,
                     hci.HCI_LE_SUBRATE_CHANGE_EVENT,
+                    hci.HCI_LE_CS_READ_REMOTE_SUPPORTED_CAPABILITIES_COMPLETE_EVENT,
+                    hci.HCI_LE_CS_PROCEDURE_ENABLE_COMPLETE_EVENT,
+                    hci.HCI_LE_CS_SECURITY_ENABLE_COMPLETE_EVENT,
+                    hci.HCI_LE_CS_CONFIG_COMPLETE_EVENT,
+                    hci.HCI_LE_CS_SUBEVENT_RESULT_EVENT,
+                    hci.HCI_LE_CS_SUBEVENT_RESULT_CONTINUE_EVENT,
                 ]
             )
 
@@ -955,7 +974,7 @@ class Host(AbortableEventEmitter):
                     self,
                     event.connection_handle,
                     event.peer_address,
-                    BT_LE_TRANSPORT,
+                    PhysicalTransport.LE,
                 )
                 self.connections[event.connection_handle] = connection
 
@@ -968,11 +987,11 @@ class Host(AbortableEventEmitter):
             self.emit(
                 'connection',
                 event.connection_handle,
-                BT_LE_TRANSPORT,
+                PhysicalTransport.LE,
                 event.peer_address,
                 getattr(event, 'local_resolvable_private_address', None),
                 getattr(event, 'peer_resolvable_private_address', None),
-                event.role,
+                hci.Role(event.role),
                 connection_parameters,
             )
         else:
@@ -980,7 +999,10 @@ class Host(AbortableEventEmitter):
 
             # Notify the listeners
             self.emit(
-                'connection_failure', BT_LE_TRANSPORT, event.peer_address, event.status
+                'connection_failure',
+                PhysicalTransport.LE,
+                event.peer_address,
+                event.status,
             )
 
     def on_hci_le_enhanced_connection_complete_event(self, event):
@@ -1005,7 +1027,7 @@ class Host(AbortableEventEmitter):
                     self,
                     event.connection_handle,
                     event.bd_addr,
-                    BT_BR_EDR_TRANSPORT,
+                    PhysicalTransport.BR_EDR,
                 )
                 self.connections[event.connection_handle] = connection
 
@@ -1013,7 +1035,7 @@ class Host(AbortableEventEmitter):
             self.emit(
                 'connection',
                 event.connection_handle,
-                BT_BR_EDR_TRANSPORT,
+                PhysicalTransport.BR_EDR,
                 event.bd_addr,
                 None,
                 None,
@@ -1025,7 +1047,10 @@ class Host(AbortableEventEmitter):
 
             # Notify the client
             self.emit(
-                'connection_failure', BT_BR_EDR_TRANSPORT, event.bd_addr, event.status
+                'connection_failure',
+                PhysicalTransport.BR_EDR,
+                event.bd_addr,
+                event.status,
             )
 
     def on_hci_disconnection_complete_event(self, event):
@@ -1055,8 +1080,10 @@ class Host(AbortableEventEmitter):
             )
 
             # Flush the data queues
-            self.acl_packet_queue.flush(handle)
+            if self.acl_packet_queue:
-            self.le_acl_packet_queue.flush(handle)
+                self.acl_packet_queue.flush(handle)
+            if self.le_acl_packet_queue:
+                self.le_acl_packet_queue.flush(handle)
             if self.iso_packet_queue:
                 self.iso_packet_queue.flush(handle)
         else:
@@ -1092,8 +1119,11 @@ class Host(AbortableEventEmitter):
 
         # Notify the client
         if event.status == hci.HCI_SUCCESS:
-            connection_phy = ConnectionPHY(event.tx_phy, event.rx_phy)
+            self.emit(
-            self.emit('connection_phy_update', connection.handle, connection_phy)
+                'connection_phy_update',
+                connection.handle,
+                ConnectionPHY(event.tx_phy, event.rx_phy),
+            )
         else:
             self.emit('connection_phy_update_failure', connection.handle, event.status)
 
@@ -1198,6 +1228,32 @@ class Host(AbortableEventEmitter):
         self.remove_big(event.big_handle)
         self.emit('big_termination', event.reason, event.big_handle)
 
+    def on_hci_le_periodic_advertising_sync_transfer_received_event(self, event):
+        self.emit(
+            'periodic_advertising_sync_transfer',
+            event.status,
+            event.connection_handle,
+            event.sync_handle,
+            event.advertising_sid,
+            event.advertiser_address,
+            event.advertiser_phy,
+            event.periodic_advertising_interval,
+            event.advertiser_clock_accuracy,
+        )
+
+    def on_hci_le_periodic_advertising_sync_transfer_received_v2_event(self, event):
+        self.emit(
+            'periodic_advertising_sync_transfer',
+            event.status,
+            event.connection_handle,
+            event.sync_handle,
+            event.advertising_sid,
+            event.advertiser_address,
+            event.advertiser_phy,
+            event.periodic_advertising_interval,
+            event.advertiser_clock_accuracy,
+        )
+
     def on_hci_le_cis_established_event(self, event):
         # The remaining parameters are unused for now.
         if event.status == hci.HCI_SUCCESS:
@@ -1241,7 +1297,8 @@ class Host(AbortableEventEmitter):
                 logger.debug('no long term key provider')
                 long_term_key = None
             else:
-                long_term_key = await self.abort_on(
+                long_term_key = await utils.cancel_on_event(
+                    self,
                     'flush',
                     # pylint: disable-next=not-callable
                     self.long_term_key_provider(
@@ -1299,7 +1356,7 @@ class Host(AbortableEventEmitter):
                 f'role change for {event.bd_addr}: '
                 f'{hci.HCI_Constant.role_name(event.new_role)}'
             )
-            self.emit('role_change', event.bd_addr, event.new_role)
+            self.emit('role_change', event.bd_addr, hci.Role(event.new_role))
         else:
             logger.debug(
                 f'role change for {event.bd_addr} failed: '
@@ -1335,6 +1392,21 @@ class Host(AbortableEventEmitter):
                 'connection_encryption_change',
                 event.connection_handle,
                 event.encryption_enabled,
+                0,
+            )
+        else:
+            self.emit(
+                'connection_encryption_failure', event.connection_handle, event.status
+            )
+
+    def on_hci_encryption_change_v2_event(self, event):
+        # Notify the client
+        if event.status == hci.HCI_SUCCESS:
+            self.emit(
+                'connection_encryption_change',
+                event.connection_handle,
+                event.encryption_enabled,
+                event.encryption_key_size,
             )
         else:
             self.emit(
@@ -1399,7 +1471,8 @@ class Host(AbortableEventEmitter):
                 logger.debug('no link key provider')
                 link_key = None
             else:
-                link_key = await self.abort_on(
+                link_key = await utils.cancel_on_event(
+                    self,
                     'flush',
                     # pylint: disable-next=not-callable
                     self.link_key_provider(event.bd_addr),
@@ -1495,5 +1568,23 @@ class Host(AbortableEventEmitter):
                 int.from_bytes(event.le_features, 'little'),
             )
 
+    def on_hci_le_cs_read_remote_supported_capabilities_complete_event(self, event):
+        self.emit('cs_remote_supported_capabilities', event)
+
+    def on_hci_le_cs_security_enable_complete_event(self, event):
+        self.emit('cs_security', event)
+
+    def on_hci_le_cs_config_complete_event(self, event):
+        self.emit('cs_config', event)
+
+    def on_hci_le_cs_procedure_enable_complete_event(self, event):
+        self.emit('cs_procedure', event)
+
+    def on_hci_le_cs_subevent_result_event(self, event):
+        self.emit('cs_subevent_result', event)
+
+    def on_hci_le_cs_subevent_result_continue_event(self, event):
+        self.emit('cs_subevent_result_continue', event)
+
     def on_hci_vendor_event(self, event):
         self.emit('vendor_event', event)

bumble/keys.py

@@ -28,11 +28,11 @@ import json
 from typing import TYPE_CHECKING, Dict, List, Optional, Tuple, Type
 from typing_extensions import Self
 
-from .colors import color
+from bumble.colors import color
-from .hci import Address
+from bumble.hci import Address
 
 if TYPE_CHECKING:
-    from .device import Device
+    from bumble.device import Device
 
 
 # -----------------------------------------------------------------------------

bumble/l2cap.py

@@ -23,7 +23,6 @@ import logging
 import struct
 
 from collections import deque
-from pyee import EventEmitter
 from typing import (
     Dict,
     Type,
@@ -39,19 +38,19 @@ from typing import (
     TYPE_CHECKING,
 )
 
-from .utils import deprecated
+from bumble import utils
-from .colors import color
+from bumble.colors import color
-from .core import (
+from bumble.core import (
-    BT_CENTRAL_ROLE,
     InvalidStateError,
     InvalidArgumentError,
     InvalidPacketError,
     OutOfResourcesError,
     ProtocolError,
 )
-from .hci import (
+from bumble.hci import (
     HCI_LE_Connection_Update_Command,
     HCI_Object,
+    Role,
     key_with_value,
     name_or_number,
 )
@@ -720,7 +719,7 @@ class L2CAP_LE_Flow_Control_Credit(L2CAP_Control_Frame):
 
 
 # -----------------------------------------------------------------------------
-class ClassicChannel(EventEmitter):
+class ClassicChannel(utils.EventEmitter):
     class State(enum.IntEnum):
         # States
         CLOSED = 0x00
@@ -745,6 +744,9 @@ class ClassicChannel(EventEmitter):
         WAIT_FINAL_RSP = 0x16
         WAIT_CONTROL_IND = 0x17
 
+    EVENT_OPEN = "open"
+    EVENT_CLOSE = "close"
+
     connection_result: Optional[asyncio.Future[None]]
     disconnection_result: Optional[asyncio.Future[None]]
     response: Optional[asyncio.Future[bytes]]
@@ -821,8 +823,8 @@ class ClassicChannel(EventEmitter):
 
         # Wait for the connection to succeed or fail
         try:
-            return await self.connection.abort_on(
+            return await utils.cancel_on_event(
-                'disconnection', self.connection_result
+                self.connection, 'disconnection', self.connection_result
             )
         finally:
             self.connection_result = None
@@ -848,7 +850,7 @@ class ClassicChannel(EventEmitter):
     def abort(self) -> None:
         if self.state == self.State.OPEN:
             self._change_state(self.State.CLOSED)
-            self.emit('close')
+            self.emit(self.EVENT_CLOSE)
 
     def send_configure_request(self) -> None:
         options = L2CAP_Control_Frame.encode_configuration_options(
@@ -941,7 +943,7 @@ class ClassicChannel(EventEmitter):
             if self.connection_result:
                 self.connection_result.set_result(None)
                 self.connection_result = None
-            self.emit('open')
+            self.emit(self.EVENT_OPEN)
         elif self.state == self.State.WAIT_CONFIG_REQ_RSP:
             self._change_state(self.State.WAIT_CONFIG_RSP)
 
@@ -957,7 +959,7 @@ class ClassicChannel(EventEmitter):
                 if self.connection_result:
                     self.connection_result.set_result(None)
                     self.connection_result = None
-                self.emit('open')
+                self.emit(self.EVENT_OPEN)
             else:
                 logger.warning(color('invalid state', 'red'))
         elif (
@@ -992,7 +994,7 @@ class ClassicChannel(EventEmitter):
                 )
             )
             self._change_state(self.State.CLOSED)
-            self.emit('close')
+            self.emit(self.EVENT_CLOSE)
             self.manager.on_channel_closed(self)
         else:
             logger.warning(color('invalid state', 'red'))
@@ -1013,7 +1015,7 @@ class ClassicChannel(EventEmitter):
         if self.disconnection_result:
             self.disconnection_result.set_result(None)
             self.disconnection_result = None
-        self.emit('close')
+        self.emit(self.EVENT_CLOSE)
         self.manager.on_channel_closed(self)
 
     def __str__(self) -> str:
@@ -1026,7 +1028,7 @@ class ClassicChannel(EventEmitter):
 
 
 # -----------------------------------------------------------------------------
-class LeCreditBasedChannel(EventEmitter):
+class LeCreditBasedChannel(utils.EventEmitter):
     """
     LE Credit-based Connection Oriented Channel
     """
@@ -1048,6 +1050,9 @@ class LeCreditBasedChannel(EventEmitter):
     connection: Connection
     sink: Optional[Callable[[bytes], Any]]
 
+    EVENT_OPEN = "open"
+    EVENT_CLOSE = "close"
+
     def __init__(
         self,
         manager: ChannelManager,
@@ -1099,9 +1104,9 @@ class LeCreditBasedChannel(EventEmitter):
         self.state = new_state
 
         if new_state == self.State.CONNECTED:
-            self.emit('open')
+            self.emit(self.EVENT_OPEN)
         elif new_state == self.State.DISCONNECTED:
-            self.emit('close')
+            self.emit(self.EVENT_CLOSE)
 
     def send_pdu(self, pdu: Union[SupportsBytes, bytes]) -> None:
         self.manager.send_pdu(self.connection, self.destination_cid, pdu)
@@ -1381,7 +1386,9 @@ class LeCreditBasedChannel(EventEmitter):
 
 
 # -----------------------------------------------------------------------------
-class ClassicChannelServer(EventEmitter):
+class ClassicChannelServer(utils.EventEmitter):
+    EVENT_CONNECTION = "connection"
+
     def __init__(
         self,
         manager: ChannelManager,
@@ -1396,7 +1403,7 @@ class ClassicChannelServer(EventEmitter):
         self.mtu = mtu
 
     def on_connection(self, channel: ClassicChannel) -> None:
-        self.emit('connection', channel)
+        self.emit(self.EVENT_CONNECTION, channel)
         if self.handler:
             self.handler(channel)
 
@@ -1406,7 +1413,9 @@ class ClassicChannelServer(EventEmitter):
 
 
 # -----------------------------------------------------------------------------
-class LeCreditBasedChannelServer(EventEmitter):
+class LeCreditBasedChannelServer(utils.EventEmitter):
+    EVENT_CONNECTION = "connection"
+
     def __init__(
         self,
         manager: ChannelManager,
@@ -1425,7 +1434,7 @@ class LeCreditBasedChannelServer(EventEmitter):
         self.mps = mps
 
     def on_connection(self, channel: LeCreditBasedChannel) -> None:
-        self.emit('connection', channel)
+        self.emit(self.EVENT_CONNECTION, channel)
         if self.handler:
             self.handler(channel)
 
@@ -1521,6 +1530,9 @@ class ChannelManager:
 
     def next_identifier(self, connection: Connection) -> int:
         identifier = (self.identifiers.setdefault(connection.handle, 0) + 1) % 256
+        # 0x00 is an invalid ID (BT Core Spec, Vol 3, Part A, Sect 4
+        if identifier == 0:
+            identifier = 1
         self.identifiers[connection.handle] = identifier
         return identifier
 
@@ -1533,7 +1545,7 @@ class ChannelManager:
         if cid in self.fixed_channels:
             del self.fixed_channels[cid]
 
-    @deprecated("Please use create_classic_server")
+    @utils.deprecated("Please use create_classic_server")
     def register_server(
         self,
         psm: int,
@@ -1579,7 +1591,7 @@ class ChannelManager:
 
         return self.servers[spec.psm]
 
-    @deprecated("Please use create_le_credit_based_server()")
+    @utils.deprecated("Please use create_le_credit_based_server()")
     def register_le_coc_server(
         self,
         psm: int,
@@ -1908,7 +1920,7 @@ class ChannelManager:
     def on_l2cap_connection_parameter_update_request(
         self, connection: Connection, cid: int, request
     ):
-        if connection.role == BT_CENTRAL_ROLE:
+        if connection.role == Role.CENTRAL:
             self.send_control_frame(
                 connection,
                 cid,
@@ -2123,7 +2135,7 @@ class ChannelManager:
             if channel.source_cid in connection_channels:
                 del connection_channels[channel.source_cid]
 
-    @deprecated("Please use create_le_credit_based_channel()")
+    @utils.deprecated("Please use create_le_credit_based_channel()")
     async def open_le_coc(
         self, connection: Connection, psm: int, max_credits: int, mtu: int, mps: int
     ) -> LeCreditBasedChannel:
@@ -2180,7 +2192,7 @@ class ChannelManager:
 
         return channel
 
-    @deprecated("Please use create_classic_channel()")
+    @utils.deprecated("Please use create_classic_channel()")
     async def connect(self, connection: Connection, psm: int) -> ClassicChannel:
         return await self.create_classic_channel(
             connection=connection, spec=ClassicChannelSpec(psm=psm)
@@ -2230,12 +2242,12 @@ class ChannelManager:
 
 
 class Channel(ClassicChannel):
-    @deprecated("Please use ClassicChannel")
+    @utils.deprecated("Please use ClassicChannel")
     def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)
 
 
 class LeConnectionOrientedChannel(LeCreditBasedChannel):
-    @deprecated("Please use LeCreditBasedChannel")
+    @utils.deprecated("Please use LeCreditBasedChannel")
     def __init__(self, *args, **kwargs) -> None:
         super().__init__(*args, **kwargs)

bumble/link.py

@@ -20,14 +20,13 @@ import asyncio
 from functools import partial
 
 from bumble.core import (
-    BT_PERIPHERAL_ROLE,
+    PhysicalTransport,
-    BT_BR_EDR_TRANSPORT,
-    BT_LE_TRANSPORT,
     InvalidStateError,
 )
 from bumble.colors import color
 from bumble.hci import (
     Address,
+    Role,
     HCI_SUCCESS,
     HCI_CONNECTION_ACCEPT_TIMEOUT_ERROR,
     HCI_CONNECTION_TIMEOUT_ERROR,
@@ -116,10 +115,10 @@ class LocalLink:
 
     def send_acl_data(self, sender_controller, destination_address, transport, data):
         # Send the data to the first controller with a matching address
-        if transport == BT_LE_TRANSPORT:
+        if transport == PhysicalTransport.LE:
             destination_controller = self.find_controller(destination_address)
             source_address = sender_controller.random_address
-        elif transport == BT_BR_EDR_TRANSPORT:
+        elif transport == PhysicalTransport.BR_EDR:
             destination_controller = self.find_classic_controller(destination_address)
             source_address = sender_controller.public_address
         else:
@@ -292,7 +291,7 @@ class LocalLink:
             return
 
         async def task():
-            if responder_role != BT_PERIPHERAL_ROLE:
+            if responder_role != Role.PERIPHERAL:
                 initiator_controller.on_classic_role_change(
                     responder_controller.public_address, int(not (responder_role))
                 )

bumble/pairing.py

@@ -1,4 +1,4 @@
-# Copyright 2021-2023 Google LLC
+# Copyright 2021-2025 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -20,14 +20,14 @@ import enum
 from dataclasses import dataclass
 from typing import Optional, Tuple
 
-from .hci import (
+from bumble.hci import (
     Address,
     HCI_NO_INPUT_NO_OUTPUT_IO_CAPABILITY,
     HCI_DISPLAY_ONLY_IO_CAPABILITY,
     HCI_DISPLAY_YES_NO_IO_CAPABILITY,
     HCI_KEYBOARD_ONLY_IO_CAPABILITY,
 )
-from .smp import (
+from bumble.smp import (
     SMP_NO_INPUT_NO_OUTPUT_IO_CAPABILITY,
     SMP_KEYBOARD_ONLY_IO_CAPABILITY,
     SMP_DISPLAY_ONLY_IO_CAPABILITY,
@@ -41,7 +41,7 @@ from .smp import (
     OobLegacyContext,
     OobSharedData,
 )
-from .core import AdvertisingData, LeRole
+from bumble.core import AdvertisingData, LeRole
 
 
 # -----------------------------------------------------------------------------
@@ -76,18 +76,18 @@ class OobData:
         return instance
 
     def to_ad(self) -> AdvertisingData:
-        ad_structures = []
+        ad_structures: list[tuple[int, bytes]] = []
         if self.address is not None:
             ad_structures.append(
-                (AdvertisingData.LE_BLUETOOTH_DEVICE_ADDRESS, bytes(self.address))
+                (AdvertisingData.Type.LE_BLUETOOTH_DEVICE_ADDRESS, bytes(self.address))
             )
         if self.role is not None:
-            ad_structures.append((AdvertisingData.LE_ROLE, bytes([self.role])))
+            ad_structures.append((AdvertisingData.Type.LE_ROLE, bytes([self.role])))
         if self.shared_data is not None:
             ad_structures.extend(self.shared_data.to_ad().ad_structures)
         if self.legacy_context is not None:
             ad_structures.append(
-                (AdvertisingData.SECURITY_MANAGER_TK_VALUE, self.legacy_context.tk)
+                (AdvertisingData.Type.SECURITY_MANAGER_TK_VALUE, self.legacy_context.tk)
             )
 
         return AdvertisingData(ad_structures)

bumble/pandora/__init__.py

@@ -22,11 +22,11 @@ __version__ = "0.0.1"
 import grpc
 import grpc.aio
 
-from .config import Config
+from bumble.pandora.config import Config
-from .device import PandoraDevice
+from bumble.pandora.device import PandoraDevice
-from .host import HostService
+from bumble.pandora.host import HostService
-from .l2cap import L2CAPService
+from bumble.pandora.l2cap import L2CAPService
-from .security import SecurityService, SecurityStorageService
+from bumble.pandora.security import SecurityService, SecurityStorageService
 from pandora.host_grpc_aio import add_HostServicer_to_server
 from pandora.l2cap_grpc_aio import add_L2CAPServicer_to_server
 from pandora.security_grpc_aio import (

bumble/pandora/host.py

@@ -20,12 +20,11 @@ import grpc.aio
 import logging
 import struct
 
-from . import utils
+import bumble.utils
-from .config import Config
+from bumble.pandora import utils
+from bumble.pandora.config import Config
 from bumble.core import (
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
-    BT_LE_TRANSPORT,
-    BT_PERIPHERAL_ROLE,
     UUID,
     AdvertisingData,
     Appearance,
@@ -47,6 +46,8 @@ from bumble.hci import (
     HCI_REMOTE_USER_TERMINATED_CONNECTION_ERROR,
     Address,
     Phy,
+    Role,
+    OwnAddressType,
 )
 from google.protobuf import any_pb2  # pytype: disable=pyi-error
 from google.protobuf import empty_pb2  # pytype: disable=pyi-error
@@ -114,11 +115,11 @@ SECONDARY_PHY_TO_BUMBLE_PHY_MAP: Dict[SecondaryPhy, Phy] = {
     SECONDARY_CODED: Phy.LE_CODED,
 }
 
-OWN_ADDRESS_MAP: Dict[host_pb2.OwnAddressType, bumble.hci.OwnAddressType] = {
+OWN_ADDRESS_MAP: Dict[host_pb2.OwnAddressType, OwnAddressType] = {
-    host_pb2.PUBLIC: bumble.hci.OwnAddressType.PUBLIC,
+    host_pb2.PUBLIC: OwnAddressType.PUBLIC,
-    host_pb2.RANDOM: bumble.hci.OwnAddressType.RANDOM,
+    host_pb2.RANDOM: OwnAddressType.RANDOM,
-    host_pb2.RESOLVABLE_OR_PUBLIC: bumble.hci.OwnAddressType.RESOLVABLE_OR_PUBLIC,
+    host_pb2.RESOLVABLE_OR_PUBLIC: OwnAddressType.RESOLVABLE_OR_PUBLIC,
-    host_pb2.RESOLVABLE_OR_RANDOM: bumble.hci.OwnAddressType.RESOLVABLE_OR_RANDOM,
+    host_pb2.RESOLVABLE_OR_RANDOM: OwnAddressType.RESOLVABLE_OR_RANDOM,
 }
 
 
@@ -184,7 +185,7 @@ class HostService(HostServicer):
 
         try:
             connection = await self.device.connect(
-                address, transport=BT_BR_EDR_TRANSPORT
+                address, transport=PhysicalTransport.BR_EDR
             )
         except ConnectionError as e:
             if e.error_code == HCI_PAGE_TIMEOUT_ERROR:
@@ -217,7 +218,7 @@ class HostService(HostServicer):
         self.log.debug(f"WaitConnection from {address}...")
 
         connection = self.device.find_connection_by_bd_addr(
-            address, transport=BT_BR_EDR_TRANSPORT
+            address, transport=PhysicalTransport.BR_EDR
         )
         if connection and id(connection) in self.waited_connections:
             # this connection was already returned: wait for a new one.
@@ -249,8 +250,8 @@ class HostService(HostServicer):
         try:
             connection = await self.device.connect(
                 address,
-                transport=BT_LE_TRANSPORT,
+                transport=PhysicalTransport.LE,
-                own_address_type=request.own_address_type,
+                own_address_type=OwnAddressType(request.own_address_type),
             )
         except ConnectionError as e:
             if e.error_code == HCI_PAGE_TIMEOUT_ERROR:
@@ -295,12 +296,12 @@ class HostService(HostServicer):
             def on_disconnection(_: None) -> None:
                 disconnection_future.set_result(None)
 
-            connection.on('disconnection', on_disconnection)
+            connection.on(connection.EVENT_DISCONNECTION, on_disconnection)
             try:
                 await disconnection_future
                 self.log.debug("Disconnected")
             finally:
-                connection.remove_listener('disconnection', on_disconnection)  # type: ignore
+                connection.remove_listener(connection.EVENT_DISCONNECTION, on_disconnection)  # type: ignore
 
         return empty_pb2.Empty()
 
@@ -371,20 +372,18 @@ class HostService(HostServicer):
             scan_response_data=scan_response_data,
         )
 
-        pending_connection: asyncio.Future[bumble.device.Connection] = (
+        connections: asyncio.Queue[bumble.device.Connection] = asyncio.Queue()
-            asyncio.get_running_loop().create_future()
-        )
 
         if request.connectable:
 
             def on_connection(connection: bumble.device.Connection) -> None:
                 if (
-                    connection.transport == BT_LE_TRANSPORT
+                    connection.transport == PhysicalTransport.LE
-                    and connection.role == BT_PERIPHERAL_ROLE
+                    and connection.role == Role.PERIPHERAL
                 ):
-                    pending_connection.set_result(connection)
+                    connections.put_nowait(connection)
 
-            self.device.on('connection', on_connection)
+            self.device.on(self.device.EVENT_CONNECTION, on_connection)
 
         try:
             # Advertise until RPC is canceled
@@ -397,8 +396,7 @@ class HostService(HostServicer):
                     await asyncio.sleep(1)
                     continue
 
-                connection = await pending_connection
+                connection = await connections.get()
-                pending_connection = asyncio.get_running_loop().create_future()
 
                 cookie = any_pb2.Any(value=connection.handle.to_bytes(4, 'big'))
                 yield AdvertiseResponse(connection=Connection(cookie=cookie))
@@ -492,16 +490,18 @@ class HostService(HostServicer):
                 target = Address(target_bytes, Address.RANDOM_DEVICE_ADDRESS)
                 advertising_type = AdvertisingType.DIRECTED_CONNECTABLE_LOW_DUTY
 
+        connections: asyncio.Queue[bumble.device.Connection] = asyncio.Queue()
+
         if request.connectable:
 
             def on_connection(connection: bumble.device.Connection) -> None:
                 if (
-                    connection.transport == BT_LE_TRANSPORT
+                    connection.transport == PhysicalTransport.LE
-                    and connection.role == BT_PERIPHERAL_ROLE
+                    and connection.role == Role.PERIPHERAL
                 ):
-                    pending_connection.set_result(connection)
+                    connections.put_nowait(connection)
 
-            self.device.on('connection', on_connection)
+            self.device.on(self.device.EVENT_CONNECTION, on_connection)
 
         try:
             while True:
@@ -510,19 +510,15 @@ class HostService(HostServicer):
                     await self.device.start_advertising(
                         target=target,
                         advertising_type=advertising_type,
-                        own_address_type=request.own_address_type,
+                        own_address_type=OwnAddressType(request.own_address_type),
                     )
 
                 if not request.connectable:
                     await asyncio.sleep(1)
                     continue
 
-                pending_connection: asyncio.Future[bumble.device.Connection] = (
-                    asyncio.get_running_loop().create_future()
-                )
-
                 self.log.debug('Wait for LE connection...')
-                connection = await pending_connection
+                connection = await connections.get()
 
                 self.log.debug(
                     f"Advertise: Connected to {connection.peer_address} (handle={connection.handle})"
@@ -535,11 +531,13 @@ class HostService(HostServicer):
                 await asyncio.sleep(1)
         finally:
             if request.connectable:
-                self.device.remove_listener('connection', on_connection)  # type: ignore
+                self.device.remove_listener(self.device.EVENT_CONNECTION, on_connection)  # type: ignore
 
             try:
                 self.log.debug('Stop advertising')
-                await self.device.abort_on('flush', self.device.stop_advertising())
+                await bumble.utils.cancel_on_event(
+                    self.device, 'flush', self.device.stop_advertising()
+                )
             except:
                 pass
 
@@ -559,11 +557,11 @@ class HostService(HostServicer):
             scanning_phys = [int(Phy.LE_1M), int(Phy.LE_CODED)]
 
         scan_queue: asyncio.Queue[Advertisement] = asyncio.Queue()
-        handler = self.device.on('advertisement', scan_queue.put_nowait)
+        handler = self.device.on(self.device.EVENT_ADVERTISEMENT, scan_queue.put_nowait)
         await self.device.start_scanning(
             legacy=request.legacy,
             active=not request.passive,
-            own_address_type=request.own_address_type,
+            own_address_type=OwnAddressType(request.own_address_type),
             scan_interval=(
                 int(request.interval)
                 if request.interval
@@ -604,10 +602,12 @@ class HostService(HostServicer):
                 yield sr
 
         finally:
-            self.device.remove_listener('advertisement', handler)  # type: ignore
+            self.device.remove_listener(self.device.EVENT_ADVERTISEMENT, handler)  # type: ignore
             try:
                 self.log.debug('Stop scanning')
-                await self.device.abort_on('flush', self.device.stop_scanning())
+                await bumble.utils.cancel_on_event(
+                    self.device, 'flush', self.device.stop_scanning()
+                )
             except:
                 pass
 
@@ -621,10 +621,10 @@ class HostService(HostServicer):
             Optional[Tuple[Address, int, AdvertisingData, int]]
         ] = asyncio.Queue()
         complete_handler = self.device.on(
-            'inquiry_complete', lambda: inquiry_queue.put_nowait(None)
+            self.device.EVENT_INQUIRY_COMPLETE, lambda: inquiry_queue.put_nowait(None)
         )
         result_handler = self.device.on(  # type: ignore
-            'inquiry_result',
+            self.device.EVENT_INQUIRY_RESULT,
             lambda address, class_of_device, eir_data, rssi: inquiry_queue.put_nowait(  # type: ignore
                 (address, class_of_device, eir_data, rssi)  # type: ignore
             ),
@@ -643,11 +643,13 @@ class HostService(HostServicer):
                 )
 
         finally:
-            self.device.remove_listener('inquiry_complete', complete_handler)  # type: ignore
+            self.device.remove_listener(self.device.EVENT_INQUIRY_COMPLETE, complete_handler)  # type: ignore
-            self.device.remove_listener('inquiry_result', result_handler)  # type: ignore
+            self.device.remove_listener(self.device.EVENT_INQUIRY_RESULT, result_handler)  # type: ignore
             try:
                 self.log.debug('Stop inquiry')
-                await self.device.abort_on('flush', self.device.stop_discovery())
+                await bumble.utils.cancel_on_event(
+                    self.device, 'flush', self.device.stop_discovery()
+                )
             except:
                 pass
 

bumble/pandora/l2cap.py

@@ -19,8 +19,8 @@ import logging
 
 from asyncio import Queue as AsyncQueue, Future
 
-from . import utils
+from bumble.pandora import utils
-from .config import Config
+from bumble.pandora.config import Config
 from bumble.core import OutOfResourcesError, InvalidArgumentError
 from bumble.device import Device
 from bumble.l2cap import (
@@ -83,7 +83,7 @@ class L2CAPService(L2CAPServicer):
             close_future.set_result(None)
 
         l2cap_channel.sink = on_channel_sdu
-        l2cap_channel.on('close', on_close)
+        l2cap_channel.on(l2cap_channel.EVENT_CLOSE, on_close)
 
         return ChannelContext(close_future, sdu_queue)
 
@@ -151,7 +151,7 @@ class L2CAPService(L2CAPServicer):
                 spec=spec, handler=on_l2cap_channel
             )
         else:
-            l2cap_server.on('connection', on_l2cap_channel)
+            l2cap_server.on(l2cap_server.EVENT_CONNECTION, on_l2cap_channel)
 
         try:
             self.log.debug('Waiting for a channel connection.')

bumble/pandora/security.py

@@ -18,18 +18,16 @@ import contextlib
 import grpc
 import logging
 
-from . import utils
+from bumble.pandora import utils
-from .config import Config
+from bumble.pandora.config import Config
 from bumble import hci
 from bumble.core import (
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
-    BT_LE_TRANSPORT,
-    BT_PERIPHERAL_ROLE,
     ProtocolError,
 )
+import bumble.utils
 from bumble.device import Connection as BumbleConnection, Device
-from bumble.hci import HCI_Error
+from bumble.hci import HCI_Error, Role
-from bumble.utils import EventWatcher
 from bumble.pairing import PairingConfig, PairingDelegate as BasePairingDelegate
 from google.protobuf import any_pb2  # pytype: disable=pyi-error
 from google.protobuf import empty_pb2  # pytype: disable=pyi-error
@@ -95,7 +93,7 @@ class PairingDelegate(BasePairingDelegate):
         else:
             # In BR/EDR, connection may not be complete,
             # use address instead
-            assert self.connection.transport == BT_BR_EDR_TRANSPORT
+            assert self.connection.transport == PhysicalTransport.BR_EDR
             ev.address = bytes(reversed(bytes(self.connection.peer_address)))
 
         return ev
@@ -174,7 +172,7 @@ class PairingDelegate(BasePairingDelegate):
 
     async def display_number(self, number: int, digits: int = 6) -> None:
         if (
-            self.connection.transport == BT_BR_EDR_TRANSPORT
+            self.connection.transport == PhysicalTransport.BR_EDR
             and self.io_capability == BasePairingDelegate.DISPLAY_OUTPUT_ONLY
         ):
             return
@@ -287,7 +285,7 @@ class SecurityService(SecurityServicer):
 
         oneof = request.WhichOneof('level')
         level = getattr(request, oneof)
-        assert {BT_BR_EDR_TRANSPORT: 'classic', BT_LE_TRANSPORT: 'le'}[
+        assert {PhysicalTransport.BR_EDR: 'classic', PhysicalTransport.LE: 'le'}[
             connection.transport
         ] == oneof
 
@@ -302,23 +300,23 @@ class SecurityService(SecurityServicer):
 
                 security_result = asyncio.get_running_loop().create_future()
 
-                with contextlib.closing(EventWatcher()) as watcher:
+                with contextlib.closing(bumble.utils.EventWatcher()) as watcher:
 
-                    @watcher.on(connection, 'pairing')
+                    @watcher.on(connection, connection.EVENT_PAIRING)
                     def on_pairing(*_: Any) -> None:
                         security_result.set_result('success')
 
-                    @watcher.on(connection, 'pairing_failure')
+                    @watcher.on(connection, connection.EVENT_PAIRING_FAILURE)
                     def on_pairing_failure(*_: Any) -> None:
                         security_result.set_result('pairing_failure')
 
-                    @watcher.on(connection, 'disconnection')
+                    @watcher.on(connection, connection.EVENT_DISCONNECTION)
                     def on_disconnection(*_: Any) -> None:
                         security_result.set_result('connection_died')
 
                     if (
-                        connection.transport == BT_LE_TRANSPORT
+                        connection.transport == PhysicalTransport.LE
-                        and connection.role == BT_PERIPHERAL_ROLE
+                        and connection.role == Role.PERIPHERAL
                     ):
                         connection.request_pairing()
                     else:
@@ -379,7 +377,7 @@ class SecurityService(SecurityServicer):
 
         assert request.level
         level = request.level
-        assert {BT_BR_EDR_TRANSPORT: 'classic', BT_LE_TRANSPORT: 'le'}[
+        assert {PhysicalTransport.BR_EDR: 'classic', PhysicalTransport.LE: 'le'}[
             connection.transport
         ] == request.level_variant()
 
@@ -427,7 +425,7 @@ class SecurityService(SecurityServicer):
                 self.log.debug('Wait for security: done')
                 wait_for_security.set_result('success')
             elif (
-                connection.transport == BT_BR_EDR_TRANSPORT
+                connection.transport == PhysicalTransport.BR_EDR
                 and self.need_authentication(connection, level)
             ):
                 nonlocal authenticate_task
@@ -451,7 +449,7 @@ class SecurityService(SecurityServicer):
             'security_request': pair,
         }
 
-        with contextlib.closing(EventWatcher()) as watcher:
+        with contextlib.closing(bumble.utils.EventWatcher()) as watcher:
             # register event handlers
             for event, listener in listeners.items():
                 watcher.on(connection, event, listener)
@@ -505,12 +503,12 @@ class SecurityService(SecurityServicer):
         return BR_LEVEL_REACHED[level](connection)
 
     def need_pairing(self, connection: BumbleConnection, level: int) -> bool:
-        if connection.transport == BT_LE_TRANSPORT:
+        if connection.transport == PhysicalTransport.LE:
             return level >= LE_LEVEL3 and not connection.authenticated
         return False
 
     def need_authentication(self, connection: BumbleConnection, level: int) -> bool:
-        if connection.transport == BT_LE_TRANSPORT:
+        if connection.transport == PhysicalTransport.LE:
             return False
         if level == LEVEL2 and connection.encryption != 0:
             return not connection.authenticated
@@ -518,7 +516,7 @@ class SecurityService(SecurityServicer):
 
     def need_encryption(self, connection: BumbleConnection, level: int) -> bool:
         # TODO(abel): need to support MITM
-        if connection.transport == BT_LE_TRANSPORT:
+        if connection.transport == PhysicalTransport.LE:
             return level == LE_LEVEL2 and not connection.encryption
         return level >= LEVEL2 and not connection.encryption
 

bumble/pandora/utils.py

@@ -20,11 +20,11 @@ import inspect
 import logging
 
 from bumble.device import Device
-from bumble.hci import Address
+from bumble.hci import Address, AddressType
 from google.protobuf.message import Message  # pytype: disable=pyi-error
 from typing import Any, Dict, Generator, MutableMapping, Optional, Tuple
 
-ADDRESS_TYPES: Dict[str, int] = {
+ADDRESS_TYPES: Dict[str, AddressType] = {
     "public": Address.PUBLIC_DEVICE_ADDRESS,
     "random": Address.RANDOM_DEVICE_ADDRESS,
     "public_identity": Address.PUBLIC_IDENTITY_ADDRESS,

bumble/profiles/aics.py

@@ -24,16 +24,13 @@ import struct
 from dataclasses import dataclass
 from typing import Optional
 
-from bumble import gatt
 from bumble.device import Connection
 from bumble.att import ATT_Error
 from bumble.gatt import (
+    Attribute,
     Characteristic,
-    SerializableCharacteristicAdapter,
-    PackedCharacteristicAdapter,
     TemplateService,
     CharacteristicValue,
-    UTF8CharacteristicAdapter,
     GATT_AUDIO_INPUT_CONTROL_SERVICE,
     GATT_AUDIO_INPUT_STATE_CHARACTERISTIC,
     GATT_GAIN_SETTINGS_ATTRIBUTE_CHARACTERISTIC,
@@ -42,8 +39,16 @@ from bumble.gatt import (
     GATT_AUDIO_INPUT_CONTROL_POINT_CHARACTERISTIC,
     GATT_AUDIO_INPUT_DESCRIPTION_CHARACTERISTIC,
 )
+from bumble.gatt_adapters import (
+    CharacteristicProxy,
+    PackedCharacteristicProxyAdapter,
+    SerializableCharacteristicAdapter,
+    SerializableCharacteristicProxyAdapter,
+    UTF8CharacteristicAdapter,
+    UTF8CharacteristicProxyAdapter,
+)
 from bumble.gatt_client import ProfileServiceProxy, ServiceProxy
-from bumble.utils import OpenIntEnum
+from bumble import utils
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -59,7 +64,7 @@ GAIN_SETTINGS_MIN_VALUE = 0
 GAIN_SETTINGS_MAX_VALUE = 255
 
 
-class ErrorCode(OpenIntEnum):
+class ErrorCode(utils.OpenIntEnum):
     '''
     Cf. 1.6 Application error codes
     '''
@@ -71,7 +76,7 @@ class ErrorCode(OpenIntEnum):
     GAIN_MODE_CHANGE_NOT_ALLOWED = 0x84
 
 
-class Mute(OpenIntEnum):
+class Mute(utils.OpenIntEnum):
     '''
     Cf. 2.2.1.2 Mute Field
     '''
@@ -81,7 +86,7 @@ class Mute(OpenIntEnum):
     DISABLED = 0x02
 
 
-class GainMode(OpenIntEnum):
+class GainMode(utils.OpenIntEnum):
     '''
     Cf. 2.2.1.3 Gain Mode
     '''
@@ -92,7 +97,7 @@ class GainMode(OpenIntEnum):
     AUTOMATIC = 0x03
 
 
-class AudioInputStatus(OpenIntEnum):
+class AudioInputStatus(utils.OpenIntEnum):
     '''
     Cf. 3.4 Audio Input Status
     '''
@@ -101,7 +106,7 @@ class AudioInputStatus(OpenIntEnum):
     ACTIVE = 0x01
 
 
-class AudioInputControlPointOpCode(OpenIntEnum):
+class AudioInputControlPointOpCode(utils.OpenIntEnum):
     '''
     Cf. 3.5.1 Audio Input Control Point procedure requirements
     '''
@@ -124,7 +129,7 @@ class AudioInputState:
     mute: Mute = Mute.NOT_MUTED
     gain_mode: GainMode = GainMode.MANUAL
     change_counter: int = 0
-    attribute_value: Optional[CharacteristicValue] = None
+    attribute: Optional[Attribute] = None
 
     def __bytes__(self) -> bytes:
         return bytes(
@@ -151,10 +156,8 @@ class AudioInputState:
         self.change_counter = (self.change_counter + 1) % (CHANGE_COUNTER_MAX_VALUE + 1)
 
     async def notify_subscribers_via_connection(self, connection: Connection) -> None:
-        assert self.attribute_value is not None
+        assert self.attribute is not None
-        await connection.device.notify_subscribers(
+        await connection.device.notify_subscribers(attribute=self.attribute)
-            attribute=self.attribute_value, value=bytes(self)
-        )
 
 
 @dataclass
@@ -315,24 +318,28 @@ class AudioInputDescription:
     '''
 
     audio_input_description: str = "Bluetooth"
-    attribute_value: Optional[CharacteristicValue] = None
+    attribute: Optional[Attribute] = None
 
     def on_read(self, _connection: Optional[Connection]) -> str:
         return self.audio_input_description
 
     async def on_write(self, connection: Optional[Connection], value: str) -> None:
         assert connection
-        assert self.attribute_value
+        assert self.attribute
 
         self.audio_input_description = value
-        await connection.device.notify_subscribers(
+        await connection.device.notify_subscribers(attribute=self.attribute)
-            attribute=self.attribute_value, value=value
-        )
 
 
 class AICSService(TemplateService):
     UUID = GATT_AUDIO_INPUT_CONTROL_SERVICE
 
+    audio_input_state_characteristic: Characteristic[AudioInputState]
+    audio_input_type_characteristic: Characteristic[bytes]
+    audio_input_status_characteristic: Characteristic[bytes]
+    audio_input_control_point_characteristic: Characteristic[bytes]
+    gain_settings_properties_characteristic: Characteristic[GainSettingsProperties]
+
     def __init__(
         self,
         audio_input_state: Optional[AudioInputState] = None,
@@ -374,9 +381,7 @@ class AICSService(TemplateService):
             ),
             AudioInputState,
         )
-        self.audio_input_state.attribute_value = (
+        self.audio_input_state.attribute = self.audio_input_state_characteristic
-            self.audio_input_state_characteristic.value
-        )
 
         self.gain_settings_properties_characteristic = (
             SerializableCharacteristicAdapter(
@@ -425,8 +430,8 @@ class AICSService(TemplateService):
                 ),
             )
         )
-        self.audio_input_description.attribute_value = (
+        self.audio_input_description.attribute = (
-            self.audio_input_control_point_characteristic.value
+            self.audio_input_control_point_characteristic
         )
 
         super().__init__(
@@ -448,24 +453,29 @@ class AICSService(TemplateService):
 class AICSServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = AICSService
 
+    audio_input_state: CharacteristicProxy[AudioInputState]
+    gain_settings_properties: CharacteristicProxy[GainSettingsProperties]
+    audio_input_status: CharacteristicProxy[int]
+    audio_input_control_point: CharacteristicProxy[bytes]
+
     def __init__(self, service_proxy: ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        self.audio_input_state = SerializableCharacteristicAdapter(
+        self.audio_input_state = SerializableCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_AUDIO_INPUT_STATE_CHARACTERISTIC
             ),
             AudioInputState,
         )
 
-        self.gain_settings_properties = SerializableCharacteristicAdapter(
+        self.gain_settings_properties = SerializableCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_GAIN_SETTINGS_ATTRIBUTE_CHARACTERISTIC
             ),
             GainSettingsProperties,
         )
 
-        self.audio_input_status = PackedCharacteristicAdapter(
+        self.audio_input_status = PackedCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_AUDIO_INPUT_STATUS_CHARACTERISTIC
             ),
@@ -478,7 +488,7 @@ class AICSServiceProxy(ProfileServiceProxy):
             )
         )
 
-        self.audio_input_description = UTF8CharacteristicAdapter(
+        self.audio_input_description = UTF8CharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_AUDIO_INPUT_DESCRIPTION_CHARACTERISTIC
             )

bumble/profiles/ancs.py

@@ -0,0 +1,515 @@
+# Copyright 2025 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.
+
+"""
+Apple Notification Center Service (ANCS).
+"""
+
+# -----------------------------------------------------------------------------
+# Imports
+# -----------------------------------------------------------------------------
+from __future__ import annotations
+import asyncio
+import dataclasses
+import datetime
+import enum
+import logging
+import struct
+from typing import Optional, Sequence, Union
+
+
+from bumble.att import ATT_Error
+from bumble.device import Peer
+from bumble.gatt import (
+    Characteristic,
+    GATT_ANCS_SERVICE,
+    GATT_ANCS_NOTIFICATION_SOURCE_CHARACTERISTIC,
+    GATT_ANCS_CONTROL_POINT_CHARACTERISTIC,
+    GATT_ANCS_DATA_SOURCE_CHARACTERISTIC,
+    TemplateService,
+)
+from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy, ServiceProxy
+from bumble.gatt_adapters import SerializableCharacteristicProxyAdapter
+from bumble import utils
+
+
+# -----------------------------------------------------------------------------
+# Constants
+# -----------------------------------------------------------------------------
+_DEFAULT_ATTRIBUTE_MAX_LENGTH = 65535
+
+
+# -----------------------------------------------------------------------------
+# Logging
+# -----------------------------------------------------------------------------
+logger = logging.getLogger(__name__)
+
+
+# -----------------------------------------------------------------------------
+# Protocol
+# -----------------------------------------------------------------------------
+class ActionId(utils.OpenIntEnum):
+    POSITIVE = 0
+    NEGATIVE = 1
+
+
+class AppAttributeId(utils.OpenIntEnum):
+    DISPLAY_NAME = 0
+
+
+class CategoryId(utils.OpenIntEnum):
+    OTHER = 0
+    INCOMING_CALL = 1
+    MISSED_CALL = 2
+    VOICEMAIL = 3
+    SOCIAL = 4
+    SCHEDULE = 5
+    EMAIL = 6
+    NEWS = 7
+    HEALTH_AND_FITNESS = 8
+    BUSINESS_AND_FINANCE = 9
+    LOCATION = 10
+    ENTERTAINMENT = 11
+
+
+class CommandId(utils.OpenIntEnum):
+    GET_NOTIFICATION_ATTRIBUTES = 0
+    GET_APP_ATTRIBUTES = 1
+    PERFORM_NOTIFICATION_ACTION = 2
+
+
+class EventId(utils.OpenIntEnum):
+    NOTIFICATION_ADDED = 0
+    NOTIFICATION_MODIFIED = 1
+    NOTIFICATION_REMOVED = 2
+
+
+class EventFlags(enum.IntFlag):
+    SILENT = 1 << 0
+    IMPORTANT = 1 << 1
+    PRE_EXISTING = 1 << 2
+    POSITIVE_ACTION = 1 << 3
+    NEGATIVE_ACTION = 1 << 4
+
+
+class NotificationAttributeId(utils.OpenIntEnum):
+    APP_IDENTIFIER = 0
+    TITLE = 1
+    SUBTITLE = 2
+    MESSAGE = 3
+    MESSAGE_SIZE = 4
+    DATE = 5
+    POSITIVE_ACTION_LABEL = 6
+    NEGATIVE_ACTION_LABEL = 7
+
+
+@dataclasses.dataclass
+class NotificationAttribute:
+    attribute_id: NotificationAttributeId
+    value: Union[str, int, datetime.datetime]
+
+
+@dataclasses.dataclass
+class AppAttribute:
+    attribute_id: AppAttributeId
+    value: str
+
+
+@dataclasses.dataclass
+class Notification:
+    event_id: EventId
+    event_flags: EventFlags
+    category_id: CategoryId
+    category_count: int
+    notification_uid: int
+
+    @classmethod
+    def from_bytes(cls, data: bytes) -> Notification:
+        return cls(
+            event_id=EventId(data[0]),
+            event_flags=EventFlags(data[1]),
+            category_id=CategoryId(data[2]),
+            category_count=data[3],
+            notification_uid=int.from_bytes(data[4:8], 'little'),
+        )
+
+    def __bytes__(self) -> bytes:
+        return struct.pack(
+            "<BBBBI",
+            self.event_id,
+            self.event_flags,
+            self.category_id,
+            self.category_count,
+            self.notification_uid,
+        )
+
+
+class ErrorCode(utils.OpenIntEnum):
+    UNKNOWN_COMMAND = 0xA0
+    INVALID_COMMAND = 0xA1
+    INVALID_PARAMETER = 0xA2
+    ACTION_FAILED = 0xA3
+
+
+class ProtocolError(Exception):
+    pass
+
+
+class CommandError(Exception):
+    def __init__(self, error_code: ErrorCode) -> None:
+        self.error_code = error_code
+
+    def __str__(self) -> str:
+        return f"CommandError(error_code={self.error_code.name})"
+
+
+# -----------------------------------------------------------------------------
+# GATT Server-side
+# -----------------------------------------------------------------------------
+class Ancs(TemplateService):
+    UUID = GATT_ANCS_SERVICE
+
+    notification_source_characteristic: Characteristic
+    data_source_characteristic: Characteristic
+    control_point_characteristic: Characteristic
+
+    def __init__(self) -> None:
+        # TODO not the final implementation
+        self.notification_source_characteristic = Characteristic(
+            GATT_ANCS_NOTIFICATION_SOURCE_CHARACTERISTIC,
+            Characteristic.Properties.NOTIFY,
+            Characteristic.Permissions.READABLE,
+        )
+
+        # TODO not the final implementation
+        self.data_source_characteristic = Characteristic(
+            GATT_ANCS_DATA_SOURCE_CHARACTERISTIC,
+            Characteristic.Properties.NOTIFY,
+            Characteristic.Permissions.READABLE,
+        )
+
+        # TODO not the final implementation
+        self.control_point_characteristic = Characteristic(
+            GATT_ANCS_CONTROL_POINT_CHARACTERISTIC,
+            Characteristic.Properties.WRITE,
+            Characteristic.Permissions.WRITEABLE,
+        )
+
+        super().__init__(
+            [
+                self.notification_source_characteristic,
+                self.data_source_characteristic,
+                self.control_point_characteristic,
+            ]
+        )
+
+
+# -----------------------------------------------------------------------------
+# GATT Client-side
+# -----------------------------------------------------------------------------
+class AncsProxy(ProfileServiceProxy):
+    SERVICE_CLASS = Ancs
+
+    notification_source: CharacteristicProxy[Notification]
+    data_source: CharacteristicProxy
+    control_point: CharacteristicProxy[bytes]
+
+    def __init__(self, service_proxy: ServiceProxy):
+        self.notification_source = SerializableCharacteristicProxyAdapter(
+            service_proxy.get_required_characteristic_by_uuid(
+                GATT_ANCS_NOTIFICATION_SOURCE_CHARACTERISTIC
+            ),
+            Notification,
+        )
+
+        self.data_source = service_proxy.get_required_characteristic_by_uuid(
+            GATT_ANCS_DATA_SOURCE_CHARACTERISTIC
+        )
+
+        self.control_point = service_proxy.get_required_characteristic_by_uuid(
+            GATT_ANCS_CONTROL_POINT_CHARACTERISTIC
+        )
+
+
+class AncsClient(utils.EventEmitter):
+    _expected_response_command_id: Optional[CommandId]
+    _expected_response_notification_uid: Optional[int]
+    _expected_response_app_identifier: Optional[str]
+    _expected_app_identifier: Optional[str]
+    _expected_response_tuples: int
+    _response_accumulator: bytes
+
+    EVENT_NOTIFICATION = "notification"
+
+    def __init__(self, ancs_proxy: AncsProxy) -> None:
+        super().__init__()
+        self._ancs_proxy = ancs_proxy
+        self._command_semaphore = asyncio.Semaphore()
+        self._response: Optional[asyncio.Future] = None
+        self._reset_response()
+        self._started = False
+
+    @classmethod
+    async def for_peer(cls, peer: Peer) -> Optional[AncsClient]:
+        ancs_proxy = await peer.discover_service_and_create_proxy(AncsProxy)
+        if ancs_proxy is None:
+            return None
+        return cls(ancs_proxy)
+
+    async def start(self) -> None:
+        await self._ancs_proxy.notification_source.subscribe(self._on_notification)
+        await self._ancs_proxy.data_source.subscribe(self._on_data)
+        self._started = True
+
+    async def stop(self) -> None:
+        await self._ancs_proxy.notification_source.unsubscribe(self._on_notification)
+        await self._ancs_proxy.data_source.unsubscribe(self._on_data)
+        self._started = False
+
+    def _reset_response(self) -> None:
+        self._expected_response_command_id = None
+        self._expected_response_notification_uid = None
+        self._expected_app_identifier = None
+        self._expected_response_tuples = 0
+        self._response_accumulator = b""
+
+    def _on_notification(self, notification: Notification) -> None:
+        logger.debug(f"ANCS NOTIFICATION: {notification}")
+        self.emit(self.EVENT_NOTIFICATION, notification)
+
+    def _on_data(self, data: bytes) -> None:
+        logger.debug(f"ANCS DATA: {data.hex()}")
+
+        if not self._response:
+            logger.warning("received unexpected data, discarding")
+            return
+
+        self._response_accumulator += data
+
+        # Try to parse the accumulated data until we have all we need.
+        if not self._response_accumulator:
+            logger.warning("empty data from data source")
+            return
+
+        command_id = self._response_accumulator[0]
+        if command_id != self._expected_response_command_id:
+            logger.warning(
+                "unexpected response command id: "
+                f"expected {self._expected_response_command_id} "
+                f"but got {command_id}"
+            )
+            self._reset_response()
+            if not self._response.done():
+                self._response.set_exception(ProtocolError())
+
+        if len(self._response_accumulator) < 5:
+            # Not enough data yet.
+            return
+
+        attributes: list[Union[NotificationAttribute, AppAttribute]] = []
+
+        if command_id == CommandId.GET_NOTIFICATION_ATTRIBUTES:
+            (notification_uid,) = struct.unpack_from(
+                "<I", self._response_accumulator, 1
+            )
+            if notification_uid != self._expected_response_notification_uid:
+                logger.warning(
+                    "unexpected response notification uid: "
+                    f"expected {self._expected_response_notification_uid} "
+                    f"but got {notification_uid}"
+                )
+                self._reset_response()
+                if not self._response.done():
+                    self._response.set_exception(ProtocolError())
+
+            attribute_data = self._response_accumulator[5:]
+            while len(attribute_data) >= 3:
+                attribute_id, attribute_data_length = struct.unpack_from(
+                    "<BH", attribute_data, 0
+                )
+                if len(attribute_data) < 3 + attribute_data_length:
+                    return
+                str_value = attribute_data[3 : 3 + attribute_data_length].decode(
+                    "utf-8"
+                )
+                value: Union[str, int, datetime.datetime]
+                if attribute_id == NotificationAttributeId.MESSAGE_SIZE:
+                    value = int(str_value)
+                elif attribute_id == NotificationAttributeId.DATE:
+                    year = int(str_value[:4])
+                    month = int(str_value[4:6])
+                    day = int(str_value[6:8])
+                    hour = int(str_value[9:11])
+                    minute = int(str_value[11:13])
+                    second = int(str_value[13:15])
+                    value = datetime.datetime(year, month, day, hour, minute, second)
+                else:
+                    value = str_value
+                attributes.append(
+                    NotificationAttribute(NotificationAttributeId(attribute_id), value)
+                )
+                attribute_data = attribute_data[3 + attribute_data_length :]
+        elif command_id == CommandId.GET_APP_ATTRIBUTES:
+            if 0 not in self._response_accumulator[1:]:
+                # No null-terminated string yet.
+                return
+
+            app_identifier_length = self._response_accumulator.find(0, 1) - 1
+            app_identifier = self._response_accumulator[
+                1 : 1 + app_identifier_length
+            ].decode("utf-8")
+            if app_identifier != self._expected_response_app_identifier:
+                logger.warning(
+                    "unexpected response app identifier: "
+                    f"expected {self._expected_response_app_identifier} "
+                    f"but got {app_identifier}"
+                )
+                self._reset_response()
+                if not self._response.done():
+                    self._response.set_exception(ProtocolError())
+
+            attribute_data = self._response_accumulator[1 + app_identifier_length + 1 :]
+            while len(attribute_data) >= 3:
+                attribute_id, attribute_data_length = struct.unpack_from(
+                    "<BH", attribute_data, 0
+                )
+                if len(attribute_data) < 3 + attribute_data_length:
+                    return
+                attributes.append(
+                    AppAttribute(
+                        AppAttributeId(attribute_id),
+                        attribute_data[3 : 3 + attribute_data_length].decode("utf-8"),
+                    )
+                )
+                attribute_data = attribute_data[3 + attribute_data_length :]
+        else:
+            logger.warning(f"unexpected response command id {command_id}")
+            return
+
+        if len(attributes) < self._expected_response_tuples:
+            # We have not received all the tuples yet.
+            return
+
+        if not self._response.done():
+            self._response.set_result(attributes)
+
+    async def _send_command(self, command: bytes) -> None:
+        try:
+            await self._ancs_proxy.control_point.write_value(
+                command, with_response=True
+            )
+        except ATT_Error as error:
+            raise CommandError(error_code=ErrorCode(error.error_code)) from error
+
+    async def get_notification_attributes(
+        self,
+        notification_uid: int,
+        attributes: Sequence[
+            Union[NotificationAttributeId, tuple[NotificationAttributeId, int]]
+        ],
+    ) -> list[NotificationAttribute]:
+        if not self._started:
+            raise RuntimeError("client not started")
+
+        command = struct.pack(
+            "<BI", CommandId.GET_NOTIFICATION_ATTRIBUTES, notification_uid
+        )
+        for attribute in attributes:
+            attribute_max_length = 0
+            if isinstance(attribute, tuple):
+                attribute_id, attribute_max_length = attribute
+                if attribute_id not in (
+                    NotificationAttributeId.TITLE,
+                    NotificationAttributeId.SUBTITLE,
+                    NotificationAttributeId.MESSAGE,
+                ):
+                    raise ValueError(
+                        "this attribute does not allow specifying a max length"
+                    )
+            else:
+                attribute_id = attribute
+                if attribute_id in (
+                    NotificationAttributeId.TITLE,
+                    NotificationAttributeId.SUBTITLE,
+                    NotificationAttributeId.MESSAGE,
+                ):
+                    attribute_max_length = _DEFAULT_ATTRIBUTE_MAX_LENGTH
+
+            if attribute_max_length:
+                command += struct.pack("<BH", attribute_id, attribute_max_length)
+            else:
+                command += struct.pack("B", attribute_id)
+
+        try:
+            async with self._command_semaphore:
+                self._expected_response_notification_uid = notification_uid
+                self._expected_response_tuples = len(attributes)
+                self._expected_response_command_id = (
+                    CommandId.GET_NOTIFICATION_ATTRIBUTES
+                )
+                self._response = asyncio.Future()
+
+                # Send the command.
+                await self._send_command(command)
+
+                # Wait for the response.
+                return await self._response
+        finally:
+            self._reset_response()
+
+    async def get_app_attributes(
+        self, app_identifier: str, attributes: Sequence[AppAttributeId]
+    ) -> list[AppAttribute]:
+        if not self._started:
+            raise RuntimeError("client not started")
+
+        command = (
+            bytes([CommandId.GET_APP_ATTRIBUTES])
+            + app_identifier.encode("utf-8")
+            + b"\0"
+        )
+        for attribute_id in attributes:
+            command += struct.pack("B", attribute_id)
+
+        try:
+            async with self._command_semaphore:
+                self._expected_response_app_identifier = app_identifier
+                self._expected_response_tuples = len(attributes)
+                self._expected_response_command_id = CommandId.GET_APP_ATTRIBUTES
+                self._response = asyncio.Future()
+
+                # Send the command.
+                await self._send_command(command)
+
+                # Wait for the response.
+                return await self._response
+        finally:
+            self._reset_response()
+
+    async def perform_action(self, notification_uid: int, action: ActionId) -> None:
+        if not self._started:
+            raise RuntimeError("client not started")
+
+        command = struct.pack(
+            "<BIB", CommandId.PERFORM_NOTIFICATION_ACTION, notification_uid, action
+        )
+
+        async with self._command_semaphore:
+            await self._send_command(command)
+
+    async def perform_positive_action(self, notification_uid: int) -> None:
+        return await self.perform_action(notification_uid, ActionId.POSITIVE)
+
+    async def perform_negative_action(self, notification_uid: int) -> None:
+        return await self.perform_action(notification_uid, ActionId.NEGATIVE)

bumble/profiles/ascs.py

@@ -23,6 +23,7 @@ import logging
 import struct
 from typing import Any, Dict, List, Optional, Sequence, Tuple, Type, Union
 
+from bumble import utils
 from bumble import colors
 from bumble.profiles.bap import CodecSpecificConfiguration
 from bumble.profiles import le_audio
@@ -275,6 +276,8 @@ class AseStateMachine(gatt.Characteristic):
         DISABLING        = 0x05
         RELEASING        = 0x06
 
+    EVENT_STATE_CHANGE = "state_change"
+
     cis_link: Optional[device.CisLink] = None
 
     # Additional parameters in CODEC_CONFIGURED State
@@ -301,7 +304,7 @@ class AseStateMachine(gatt.Characteristic):
     presentation_delay = 0
 
     # Additional parameters in ENABLING, STREAMING, DISABLING State
-    metadata = le_audio.Metadata()
+    metadata: le_audio.Metadata
 
     def __init__(
         self,
@@ -313,6 +316,7 @@ class AseStateMachine(gatt.Characteristic):
         self.ase_id = ase_id
         self._state = AseStateMachine.State.IDLE
         self.role = role
+        self.metadata = le_audio.Metadata()
 
         uuid = (
             gatt.GATT_SINK_ASE_CHARACTERISTIC
@@ -327,8 +331,12 @@ class AseStateMachine(gatt.Characteristic):
             value=gatt.CharacteristicValue(read=self.on_read),
         )
 
-        self.service.device.on('cis_request', self.on_cis_request)
+        self.service.device.on(
-        self.service.device.on('cis_establishment', self.on_cis_establishment)
+            self.service.device.EVENT_CIS_REQUEST, self.on_cis_request
+        )
+        self.service.device.on(
+            self.service.device.EVENT_CIS_ESTABLISHMENT, self.on_cis_establishment
+        )
 
     def on_cis_request(
         self,
@@ -342,8 +350,10 @@ class AseStateMachine(gatt.Characteristic):
             and cis_id == self.cis_id
             and self.state == self.State.ENABLING
         ):
-            acl_connection.abort_on(
+            utils.cancel_on_event(
-                'flush', self.service.device.accept_cis_request(cis_handle)
+                acl_connection,
+                'flush',
+                self.service.device.accept_cis_request(cis_handle),
             )
 
     def on_cis_establishment(self, cis_link: device.CisLink) -> None:
@@ -352,7 +362,7 @@ class AseStateMachine(gatt.Characteristic):
             and cis_link.cis_id == self.cis_id
             and self.state == self.State.ENABLING
         ):
-            cis_link.on('disconnection', self.on_cis_disconnection)
+            cis_link.on(cis_link.EVENT_DISCONNECTION, self.on_cis_disconnection)
 
             async def post_cis_established():
                 await cis_link.setup_data_path(direction=self.role)
@@ -360,7 +370,9 @@ class AseStateMachine(gatt.Characteristic):
                     self.state = self.State.STREAMING
                 await self.service.device.notify_subscribers(self, self.value)
 
-            cis_link.acl_connection.abort_on('flush', post_cis_established())
+            utils.cancel_on_event(
+                cis_link.acl_connection, 'flush', post_cis_established()
+            )
             self.cis_link = cis_link
 
     def on_cis_disconnection(self, _reason) -> None:
@@ -508,7 +520,7 @@ class AseStateMachine(gatt.Characteristic):
             self.state = self.State.IDLE
             await self.service.device.notify_subscribers(self, self.value)
 
-        self.service.device.abort_on('flush', remove_cis_async())
+        utils.cancel_on_event(self.service.device, 'flush', remove_cis_async())
         return (AseResponseCode.SUCCESS, AseReasonCode.NONE)
 
     @property
@@ -519,7 +531,7 @@ class AseStateMachine(gatt.Characteristic):
     def state(self, new_state: State) -> None:
         logger.debug(f'{self} state change -> {colors.color(new_state.name, "cyan")}')
         self._state = new_state
-        self.emit('state_change')
+        self.emit(self.EVENT_STATE_CHANGE)
 
     @property
     def value(self):
@@ -593,7 +605,7 @@ class AudioStreamControlService(gatt.TemplateService):
     UUID = gatt.GATT_AUDIO_STREAM_CONTROL_SERVICE
 
     ase_state_machines: Dict[int, AseStateMachine]
-    ase_control_point: gatt.Characteristic
+    ase_control_point: gatt.Characteristic[bytes]
     _active_client: Optional[device.Connection] = None
 
     def __init__(
@@ -690,7 +702,8 @@ class AudioStreamControlService(gatt.TemplateService):
         control_point_notification = bytes(
             [operation.op_code, len(responses)]
         ) + b''.join(map(bytes, responses))
-        self.device.abort_on(
+        utils.cancel_on_event(
+            self.device,
             'flush',
             self.device.notify_subscribers(
                 self.ase_control_point, control_point_notification
@@ -699,7 +712,8 @@ class AudioStreamControlService(gatt.TemplateService):
 
         for ase_id, *_ in responses:
             if ase := self.ase_state_machines.get(ase_id):
-                self.device.abort_on(
+                utils.cancel_on_event(
+                    self.device,
                     'flush',
                     self.device.notify_subscribers(ase, ase.value),
                 )
@@ -709,9 +723,9 @@ class AudioStreamControlService(gatt.TemplateService):
 class AudioStreamControlServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = AudioStreamControlService
 
-    sink_ase: List[gatt_client.CharacteristicProxy]
+    sink_ase: List[gatt_client.CharacteristicProxy[bytes]]
-    source_ase: List[gatt_client.CharacteristicProxy]
+    source_ase: List[gatt_client.CharacteristicProxy[bytes]]
-    ase_control_point: gatt_client.CharacteristicProxy
+    ase_control_point: gatt_client.CharacteristicProxy[bytes]
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy):
         self.service_proxy = service_proxy

bumble/profiles/asha.py

@@ -88,6 +88,11 @@ class AudioStatus(utils.OpenIntEnum):
 class AshaService(gatt.TemplateService):
     UUID = gatt.GATT_ASHA_SERVICE
 
+    EVENT_STARTED = "started"
+    EVENT_STOPPED = "stopped"
+    EVENT_DISCONNECTED = "disconnected"
+    EVENT_VOLUME_CHANGED = "volume_changed"
+
     audio_sink: Optional[Callable[[bytes], Any]]
     active_codec: Optional[Codec] = None
     audio_type: Optional[AudioType] = None
@@ -134,12 +139,14 @@ class AshaService(gatt.TemplateService):
             ),
         )
 
-        self.audio_control_point_characteristic = gatt.Characteristic(
+        self.audio_control_point_characteristic: gatt.Characteristic[bytes] = (
-            gatt.GATT_ASHA_AUDIO_CONTROL_POINT_CHARACTERISTIC,
+            gatt.Characteristic(
-            gatt.Characteristic.Properties.WRITE
+                gatt.GATT_ASHA_AUDIO_CONTROL_POINT_CHARACTERISTIC,
-            | gatt.Characteristic.Properties.WRITE_WITHOUT_RESPONSE,
+                gatt.Characteristic.Properties.WRITE
-            gatt.Characteristic.WRITEABLE,
+                | gatt.Characteristic.Properties.WRITE_WITHOUT_RESPONSE,
-            gatt.CharacteristicValue(write=self._on_audio_control_point_write),
+                gatt.Characteristic.WRITEABLE,
+                gatt.CharacteristicValue(write=self._on_audio_control_point_write),
+            )
         )
         self.audio_status_characteristic = gatt.Characteristic(
             gatt.GATT_ASHA_AUDIO_STATUS_CHARACTERISTIC,
@@ -147,7 +154,7 @@ class AshaService(gatt.TemplateService):
             gatt.Characteristic.READABLE,
             bytes([AudioStatus.OK]),
         )
-        self.volume_characteristic = gatt.Characteristic(
+        self.volume_characteristic: gatt.Characteristic[bytes] = gatt.Characteristic(
             gatt.GATT_ASHA_VOLUME_CHARACTERISTIC,
             gatt.Characteristic.Properties.WRITE_WITHOUT_RESPONSE,
             gatt.Characteristic.WRITEABLE,
@@ -166,13 +173,13 @@ class AshaService(gatt.TemplateService):
             struct.pack('<H', self.psm),
         )
 
-        characteristics = [
+        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)
 
@@ -209,14 +216,14 @@ class AshaService(gatt.TemplateService):
                 f'volume={self.volume}, '
                 f'other_state={self.other_state}'
             )
-            self.emit('started')
+            self.emit(self.EVENT_STARTED)
         elif opcode == OpCode.STOP:
             _logger.debug('### STOP')
             self.active_codec = None
             self.audio_type = None
             self.volume = None
             self.other_state = None
-            self.emit('stopped')
+            self.emit(self.EVENT_STOPPED)
         elif opcode == OpCode.STATUS:
             _logger.debug('### STATUS: %s', PeripheralStatus(value[1]).name)
 
@@ -229,7 +236,7 @@ class AshaService(gatt.TemplateService):
                 self.audio_type = None
                 self.volume = None
                 self.other_state = None
-                self.emit('disconnected')
+                self.emit(self.EVENT_DISCONNECTED)
 
             connection.once('disconnection', on_disconnection)
 
@@ -243,7 +250,7 @@ class AshaService(gatt.TemplateService):
     def _on_volume_write(self, connection: Optional[Connection], value: bytes) -> None:
         _logger.debug(f'--- VOLUME Write:{value[0]}')
         self.volume = value[0]
-        self.emit('volume_changed')
+        self.emit(self.EVENT_VOLUME_CHANGED)
 
     # Register an L2CAP CoC server
     def _on_connection(self, channel: l2cap.LeCreditBasedChannel) -> None:
@@ -257,11 +264,11 @@ class AshaService(gatt.TemplateService):
 # -----------------------------------------------------------------------------
 class AshaServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = AshaService
-    read_only_properties_characteristic: gatt_client.CharacteristicProxy
+    read_only_properties_characteristic: gatt_client.CharacteristicProxy[bytes]
-    audio_control_point_characteristic: gatt_client.CharacteristicProxy
+    audio_control_point_characteristic: gatt_client.CharacteristicProxy[bytes]
-    audio_status_point_characteristic: gatt_client.CharacteristicProxy
+    audio_status_point_characteristic: gatt_client.CharacteristicProxy[bytes]
-    volume_characteristic: gatt_client.CharacteristicProxy
+    volume_characteristic: gatt_client.CharacteristicProxy[bytes]
-    psm_characteristic: gatt_client.CharacteristicProxy
+    psm_characteristic: gatt_client.CharacteristicProxy[bytes]
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
         self.service_proxy = service_proxy

bumble/profiles/bass.py

@@ -20,11 +20,12 @@ from __future__ import annotations
 import dataclasses
 import logging
 import struct
-from typing import ClassVar, List, Optional, Sequence
+from typing import ClassVar, Optional, Sequence
 
 from bumble import core
 from bumble import device
 from bumble import gatt
+from bumble import gatt_adapters
 from bumble import gatt_client
 from bumble import hci
 from bumble import utils
@@ -52,7 +53,7 @@ def encode_subgroups(subgroups: Sequence[SubgroupInfo]) -> bytes:
     )
 
 
-def decode_subgroups(data: bytes) -> List[SubgroupInfo]:
+def decode_subgroups(data: bytes) -> list[SubgroupInfo]:
     num_subgroups = data[0]
     offset = 1
     subgroups = []
@@ -273,7 +274,7 @@ class BroadcastReceiveState:
     pa_sync_state: PeriodicAdvertisingSyncState
     big_encryption: BigEncryption
     bad_code: bytes
-    subgroups: List[SubgroupInfo]
+    subgroups: list[SubgroupInfo]
 
     @classmethod
     def from_bytes(cls, data: bytes) -> BroadcastReceiveState:
@@ -353,8 +354,10 @@ class BroadcastAudioScanService(gatt.TemplateService):
 class BroadcastAudioScanServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = BroadcastAudioScanService
 
-    broadcast_audio_scan_control_point: gatt_client.CharacteristicProxy
+    broadcast_audio_scan_control_point: gatt_client.CharacteristicProxy[bytes]
-    broadcast_receive_states: List[gatt.DelegatedCharacteristicAdapter]
+    broadcast_receive_states: list[
+        gatt_client.CharacteristicProxy[Optional[BroadcastReceiveState]]
+    ]
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy):
         self.service_proxy = service_proxy
@@ -366,7 +369,7 @@ class BroadcastAudioScanServiceProxy(gatt_client.ProfileServiceProxy):
         )
 
         self.broadcast_receive_states = [
-            gatt.DelegatedCharacteristicAdapter(
+            gatt_adapters.DelegatedCharacteristicProxyAdapter(
                 characteristic,
                 decode=lambda x: BroadcastReceiveState.from_bytes(x) if x else None,
             )

bumble/profiles/battery_service.py

@@ -16,14 +16,20 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
-from ..gatt_client import ProfileServiceProxy
+from typing import Optional
-from ..gatt import (
+
+from bumble.gatt_client import ProfileServiceProxy
+from bumble.gatt import (
     GATT_BATTERY_SERVICE,
     GATT_BATTERY_LEVEL_CHARACTERISTIC,
     TemplateService,
     Characteristic,
     CharacteristicValue,
+)
+from bumble.gatt_client import CharacteristicProxy
+from bumble.gatt_adapters import (
     PackedCharacteristicAdapter,
+    PackedCharacteristicProxyAdapter,
 )
 
 
@@ -32,6 +38,8 @@ class BatteryService(TemplateService):
     UUID = GATT_BATTERY_SERVICE
     BATTERY_LEVEL_FORMAT = 'B'
 
+    battery_level_characteristic: Characteristic[int]
+
     def __init__(self, read_battery_level):
         self.battery_level_characteristic = PackedCharacteristicAdapter(
             Characteristic(
@@ -49,13 +57,15 @@ class BatteryService(TemplateService):
 class BatteryServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = BatteryService
 
+    battery_level: Optional[CharacteristicProxy[int]]
+
     def __init__(self, service_proxy):
         self.service_proxy = service_proxy
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_BATTERY_LEVEL_CHARACTERISTIC
         ):
-            self.battery_level = PackedCharacteristicAdapter(
+            self.battery_level = PackedCharacteristicProxyAdapter(
                 characteristics[0], pack_format=BatteryService.BATTERY_LEVEL_FORMAT
             )
         else:

bumble/profiles/csip.py

@@ -99,10 +99,10 @@ class CoordinatedSetIdentificationService(gatt.TemplateService):
     UUID = gatt.GATT_COORDINATED_SET_IDENTIFICATION_SERVICE
 
     set_identity_resolving_key: bytes
-    set_identity_resolving_key_characteristic: gatt.Characteristic
+    set_identity_resolving_key_characteristic: gatt.Characteristic[bytes]
-    coordinated_set_size_characteristic: Optional[gatt.Characteristic] = None
+    coordinated_set_size_characteristic: Optional[gatt.Characteristic[bytes]] = None
-    set_member_lock_characteristic: Optional[gatt.Characteristic] = None
+    set_member_lock_characteristic: Optional[gatt.Characteristic[bytes]] = None
-    set_member_rank_characteristic: Optional[gatt.Characteristic] = None
+    set_member_rank_characteristic: Optional[gatt.Characteristic[bytes]] = None
 
     def __init__(
         self,
@@ -170,7 +170,7 @@ class CoordinatedSetIdentificationService(gatt.TemplateService):
         else:
             assert connection
 
-            if connection.transport == core.BT_LE_TRANSPORT:
+            if connection.transport == core.PhysicalTransport.LE:
                 key = await connection.device.get_long_term_key(
                     connection_handle=connection.handle, rand=b'', ediv=0
                 )
@@ -203,10 +203,10 @@ class CoordinatedSetIdentificationService(gatt.TemplateService):
 class CoordinatedSetIdentificationProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = CoordinatedSetIdentificationService
 
-    set_identity_resolving_key: gatt_client.CharacteristicProxy
+    set_identity_resolving_key: gatt_client.CharacteristicProxy[bytes]
-    coordinated_set_size: Optional[gatt_client.CharacteristicProxy] = None
+    coordinated_set_size: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    set_member_lock: Optional[gatt_client.CharacteristicProxy] = None
+    set_member_lock: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    set_member_rank: Optional[gatt_client.CharacteristicProxy] = None
+    set_member_rank: Optional[gatt_client.CharacteristicProxy[bytes]] = None
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
         self.service_proxy = service_proxy
@@ -242,7 +242,7 @@ class CoordinatedSetIdentificationProxy(gatt_client.ProfileServiceProxy):
         else:
             connection = self.service_proxy.client.connection
             device = connection.device
-            if connection.transport == core.BT_LE_TRANSPORT:
+            if connection.transport == core.PhysicalTransport.LE:
                 key = await device.get_long_term_key(
                     connection_handle=connection.handle, rand=b'', ediv=0
                 )

bumble/profiles/device_information_service.py

@@ -19,7 +19,6 @@
 import struct
 from typing import Optional, Tuple
 
-from bumble.gatt_client import ServiceProxy, ProfileServiceProxy, CharacteristicProxy
 from bumble.gatt import (
     GATT_DEVICE_INFORMATION_SERVICE,
     GATT_FIRMWARE_REVISION_STRING_CHARACTERISTIC,
@@ -32,9 +31,12 @@ from bumble.gatt import (
     GATT_REGULATORY_CERTIFICATION_DATA_LIST_CHARACTERISTIC,
     TemplateService,
     Characteristic,
-    DelegatedCharacteristicAdapter,
-    UTF8CharacteristicAdapter,
 )
+from bumble.gatt_adapters import (
+    DelegatedCharacteristicProxyAdapter,
+    UTF8CharacteristicProxyAdapter,
+)
+from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy, ServiceProxy
 
 
 # -----------------------------------------------------------------------------
@@ -62,7 +64,7 @@ class DeviceInformationService(TemplateService):
         ieee_regulatory_certification_data_list: Optional[bytes] = None,
         # TODO: pnp_id
     ):
-        characteristics = [
+        characteristics: list[Characteristic[bytes]] = [
             Characteristic(
                 uuid,
                 Characteristic.Properties.READ,
@@ -107,14 +109,14 @@ class DeviceInformationService(TemplateService):
 class DeviceInformationServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = DeviceInformationService
 
-    manufacturer_name: Optional[UTF8CharacteristicAdapter]
+    manufacturer_name: Optional[CharacteristicProxy[str]]
-    model_number: Optional[UTF8CharacteristicAdapter]
+    model_number: Optional[CharacteristicProxy[str]]
-    serial_number: Optional[UTF8CharacteristicAdapter]
+    serial_number: Optional[CharacteristicProxy[str]]
-    hardware_revision: Optional[UTF8CharacteristicAdapter]
+    hardware_revision: Optional[CharacteristicProxy[str]]
-    firmware_revision: Optional[UTF8CharacteristicAdapter]
+    firmware_revision: Optional[CharacteristicProxy[str]]
-    software_revision: Optional[UTF8CharacteristicAdapter]
+    software_revision: Optional[CharacteristicProxy[str]]
-    system_id: Optional[DelegatedCharacteristicAdapter]
+    system_id: Optional[CharacteristicProxy[tuple[int, int]]]
-    ieee_regulatory_certification_data_list: Optional[CharacteristicProxy]
+    ieee_regulatory_certification_data_list: Optional[CharacteristicProxy[bytes]]
 
     def __init__(self, service_proxy: ServiceProxy):
         self.service_proxy = service_proxy
@@ -128,7 +130,7 @@ class DeviceInformationServiceProxy(ProfileServiceProxy):
             ('software_revision', GATT_SOFTWARE_REVISION_STRING_CHARACTERISTIC),
         ):
             if characteristics := service_proxy.get_characteristics_by_uuid(uuid):
-                characteristic = UTF8CharacteristicAdapter(characteristics[0])
+                characteristic = UTF8CharacteristicProxyAdapter(characteristics[0])
             else:
                 characteristic = None
             self.__setattr__(field, characteristic)
@@ -136,7 +138,7 @@ class DeviceInformationServiceProxy(ProfileServiceProxy):
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_SYSTEM_ID_CHARACTERISTIC
         ):
-            self.system_id = DelegatedCharacteristicAdapter(
+            self.system_id = DelegatedCharacteristicProxyAdapter(
                 characteristics[0],
                 encode=lambda v: DeviceInformationService.pack_system_id(*v),
                 decode=DeviceInformationService.unpack_system_id,

bumble/profiles/gap.py

@@ -25,14 +25,15 @@ from bumble.core import Appearance
 from bumble.gatt import (
     TemplateService,
     Characteristic,
-    CharacteristicAdapter,
-    DelegatedCharacteristicAdapter,
-    UTF8CharacteristicAdapter,
     GATT_GENERIC_ACCESS_SERVICE,
     GATT_DEVICE_NAME_CHARACTERISTIC,
     GATT_APPEARANCE_CHARACTERISTIC,
 )
-from bumble.gatt_client import ProfileServiceProxy, ServiceProxy
+from bumble.gatt_adapters import (
+    DelegatedCharacteristicProxyAdapter,
+    UTF8CharacteristicProxyAdapter,
+)
+from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy, ServiceProxy
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -49,6 +50,9 @@ logger = logging.getLogger(__name__)
 class GenericAccessService(TemplateService):
     UUID = GATT_GENERIC_ACCESS_SERVICE
 
+    device_name_characteristic: Characteristic[bytes]
+    appearance_characteristic: Characteristic[bytes]
+
     def __init__(
         self, device_name: str, appearance: Union[Appearance, Tuple[int, int], int] = 0
     ):
@@ -84,8 +88,8 @@ class GenericAccessService(TemplateService):
 class GenericAccessServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = GenericAccessService
 
-    device_name: Optional[CharacteristicAdapter]
+    device_name: Optional[CharacteristicProxy[str]]
-    appearance: Optional[DelegatedCharacteristicAdapter]
+    appearance: Optional[CharacteristicProxy[Appearance]]
 
     def __init__(self, service_proxy: ServiceProxy):
         self.service_proxy = service_proxy
@@ -93,14 +97,14 @@ class GenericAccessServiceProxy(ProfileServiceProxy):
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_DEVICE_NAME_CHARACTERISTIC
         ):
-            self.device_name = UTF8CharacteristicAdapter(characteristics[0])
+            self.device_name = UTF8CharacteristicProxyAdapter(characteristics[0])
         else:
             self.device_name = None
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_APPEARANCE_CHARACTERISTIC
         ):
-            self.appearance = DelegatedCharacteristicAdapter(
+            self.appearance = DelegatedCharacteristicProxyAdapter(
                 characteristics[0],
                 decode=lambda value: Appearance.from_int(
                     struct.unpack_from('<H', value, 0)[0],

bumble/profiles/gatt_service.py

@@ -0,0 +1,167 @@
+# Copyright 2021-2025 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 __future__ import annotations
+
+import struct
+from typing import TYPE_CHECKING
+
+from bumble import att
+from bumble import gatt
+from bumble import gatt_client
+from bumble import crypto
+
+if TYPE_CHECKING:
+    from bumble import device
+
+
+# -----------------------------------------------------------------------------
+class GenericAttributeProfileService(gatt.TemplateService):
+    '''See Vol 3, Part G - 7 - DEFINED GENERIC ATTRIBUTE PROFILE SERVICE.'''
+
+    UUID = gatt.GATT_GENERIC_ATTRIBUTE_SERVICE
+
+    client_supported_features_characteristic: gatt.Characteristic[bytes] | None = None
+    server_supported_features_characteristic: gatt.Characteristic[bytes] | None = None
+    database_hash_characteristic: gatt.Characteristic[bytes] | None = None
+    service_changed_characteristic: gatt.Characteristic[bytes] | None = None
+
+    def __init__(
+        self,
+        server_supported_features: gatt.ServerSupportedFeatures | None = None,
+        database_hash_enabled: bool = True,
+        service_change_enabled: bool = True,
+    ) -> None:
+
+        if server_supported_features is not None:
+            self.server_supported_features_characteristic = gatt.Characteristic(
+                uuid=gatt.GATT_SERVER_SUPPORTED_FEATURES_CHARACTERISTIC,
+                properties=gatt.Characteristic.Properties.READ,
+                permissions=gatt.Characteristic.Permissions.READABLE,
+                value=bytes([server_supported_features]),
+            )
+
+        if database_hash_enabled:
+            self.database_hash_characteristic = gatt.Characteristic(
+                uuid=gatt.GATT_DATABASE_HASH_CHARACTERISTIC,
+                properties=gatt.Characteristic.Properties.READ,
+                permissions=gatt.Characteristic.Permissions.READABLE,
+                value=gatt.CharacteristicValue(read=self.get_database_hash),
+            )
+
+        if service_change_enabled:
+            self.service_changed_characteristic = gatt.Characteristic(
+                uuid=gatt.GATT_SERVICE_CHANGED_CHARACTERISTIC,
+                properties=gatt.Characteristic.Properties.INDICATE,
+                permissions=gatt.Characteristic.Permissions(0),
+                value=b'',
+            )
+
+        if (database_hash_enabled and service_change_enabled) or (
+            server_supported_features
+            and (
+                server_supported_features & gatt.ServerSupportedFeatures.EATT_SUPPORTED
+            )
+        ):  # TODO: Support Multiple Handle Value Notifications
+            self.client_supported_features_characteristic = gatt.Characteristic(
+                uuid=gatt.GATT_CLIENT_SUPPORTED_FEATURES_CHARACTERISTIC,
+                properties=(
+                    gatt.Characteristic.Properties.READ
+                    | gatt.Characteristic.Properties.WRITE
+                ),
+                permissions=(
+                    gatt.Characteristic.Permissions.READABLE
+                    | gatt.Characteristic.Permissions.WRITEABLE
+                ),
+                value=bytes(1),
+            )
+
+        super().__init__(
+            characteristics=[
+                c
+                for c in (
+                    self.service_changed_characteristic,
+                    self.client_supported_features_characteristic,
+                    self.database_hash_characteristic,
+                    self.server_supported_features_characteristic,
+                )
+                if c is not None
+            ],
+            primary=True,
+        )
+
+    @classmethod
+    def get_attribute_data(cls, attribute: att.Attribute) -> bytes:
+        if attribute.type in (
+            gatt.GATT_PRIMARY_SERVICE_ATTRIBUTE_TYPE,
+            gatt.GATT_SECONDARY_SERVICE_ATTRIBUTE_TYPE,
+            gatt.GATT_INCLUDE_ATTRIBUTE_TYPE,
+            gatt.GATT_CHARACTERISTIC_ATTRIBUTE_TYPE,
+            gatt.GATT_CHARACTERISTIC_EXTENDED_PROPERTIES_DESCRIPTOR,
+        ):
+            assert isinstance(attribute.value, bytes)
+            return (
+                struct.pack("<H", attribute.handle)
+                + attribute.type.to_bytes()
+                + attribute.value
+            )
+        elif attribute.type in (
+            gatt.GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
+            gatt.GATT_CLIENT_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR,
+            gatt.GATT_SERVER_CHARACTERISTIC_CONFIGURATION_DESCRIPTOR,
+            gatt.GATT_CHARACTERISTIC_PRESENTATION_FORMAT_DESCRIPTOR,
+            gatt.GATT_CHARACTERISTIC_AGGREGATE_FORMAT_DESCRIPTOR,
+        ):
+            return struct.pack("<H", attribute.handle) + attribute.type.to_bytes()
+
+        return b''
+
+    def get_database_hash(self, connection: device.Connection | None) -> bytes:
+        assert connection
+
+        m = b''.join(
+            [
+                self.get_attribute_data(attribute)
+                for attribute in connection.device.gatt_server.attributes
+            ]
+        )
+
+        return crypto.aes_cmac(m=m, k=bytes(16))
+
+
+class GenericAttributeProfileServiceProxy(gatt_client.ProfileServiceProxy):
+    SERVICE_CLASS = GenericAttributeProfileService
+
+    client_supported_features_characteristic: (
+        gatt_client.CharacteristicProxy[bytes] | None
+    ) = None
+    server_supported_features_characteristic: (
+        gatt_client.CharacteristicProxy[bytes] | None
+    ) = None
+    database_hash_characteristic: gatt_client.CharacteristicProxy[bytes] | None = None
+    service_changed_characteristic: gatt_client.CharacteristicProxy[bytes] | None = None
+
+    _CHARACTERISTICS = {
+        gatt.GATT_CLIENT_SUPPORTED_FEATURES_CHARACTERISTIC: 'client_supported_features_characteristic',
+        gatt.GATT_SERVER_SUPPORTED_FEATURES_CHARACTERISTIC: 'server_supported_features_characteristic',
+        gatt.GATT_DATABASE_HASH_CHARACTERISTIC: 'database_hash_characteristic',
+        gatt.GATT_SERVICE_CHANGED_CHARACTERISTIC: 'service_changed_characteristic',
+    }
+
+    def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
+        self.service_proxy = service_proxy
+
+        for uuid, attribute_name in self._CHARACTERISTICS.items():
+            if characteristics := self.service_proxy.get_characteristics_by_uuid(uuid):
+                setattr(self, attribute_name, characteristics[0])

bumble/profiles/gmap.py

@@ -22,7 +22,6 @@ from typing import Optional
 
 from bumble.gatt import (
     TemplateService,
-    DelegatedCharacteristicAdapter,
     Characteristic,
     GATT_GAMING_AUDIO_SERVICE,
     GATT_GMAP_ROLE_CHARACTERISTIC,
@@ -31,7 +30,8 @@ from bumble.gatt import (
     GATT_BGS_FEATURES_CHARACTERISTIC,
     GATT_BGR_FEATURES_CHARACTERISTIC,
 )
-from bumble.gatt_client import ProfileServiceProxy, ServiceProxy
+from bumble.gatt_adapters import DelegatedCharacteristicProxyAdapter
+from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy, ServiceProxy
 from enum import IntFlag
 
 
@@ -150,10 +150,15 @@ class GamingAudioService(TemplateService):
 class GamingAudioServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = GamingAudioService
 
+    ugg_features: Optional[CharacteristicProxy[UggFeatures]] = None
+    ugt_features: Optional[CharacteristicProxy[UgtFeatures]] = None
+    bgs_features: Optional[CharacteristicProxy[BgsFeatures]] = None
+    bgr_features: Optional[CharacteristicProxy[BgrFeatures]] = None
+
     def __init__(self, service_proxy: ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        self.gmap_role = DelegatedCharacteristicAdapter(
+        self.gmap_role = DelegatedCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_GMAP_ROLE_CHARACTERISTIC
             ),
@@ -163,31 +168,31 @@ class GamingAudioServiceProxy(ProfileServiceProxy):
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_UGG_FEATURES_CHARACTERISTIC
         ):
-            self.ugg_features = DelegatedCharacteristicAdapter(
+            self.ugg_features = DelegatedCharacteristicProxyAdapter(
-                characteristic=characteristics[0],
+                characteristics[0],
                 decode=lambda value: UggFeatures(value[0]),
             )
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_UGT_FEATURES_CHARACTERISTIC
         ):
-            self.ugt_features = DelegatedCharacteristicAdapter(
+            self.ugt_features = DelegatedCharacteristicProxyAdapter(
-                characteristic=characteristics[0],
+                characteristics[0],
                 decode=lambda value: UgtFeatures(value[0]),
             )
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_BGS_FEATURES_CHARACTERISTIC
         ):
-            self.bgs_features = DelegatedCharacteristicAdapter(
+            self.bgs_features = DelegatedCharacteristicProxyAdapter(
-                characteristic=characteristics[0],
+                characteristics[0],
                 decode=lambda value: BgsFeatures(value[0]),
             )
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             GATT_BGR_FEATURES_CHARACTERISTIC
         ):
-            self.bgr_features = DelegatedCharacteristicAdapter(
+            self.bgr_features = DelegatedCharacteristicProxyAdapter(
-                characteristic=characteristics[0],
+                characteristics[0],
                 decode=lambda value: BgrFeatures(value[0]),
             )

bumble/profiles/hap.py

@@ -18,20 +18,21 @@
 from __future__ import annotations
 import asyncio
 import functools
-from bumble import att, gatt, gatt_client
-from bumble.core import InvalidArgumentError, InvalidStateError
-from bumble.device import Device, Connection
-from bumble.utils import AsyncRunner, OpenIntEnum
-from bumble.hci import Address
 from dataclasses import dataclass, field
 import logging
 from typing import Any, Dict, List, Optional, Set, Union
 
+from bumble import att, gatt, gatt_adapters, gatt_client
+from bumble.core import InvalidArgumentError, InvalidStateError
+from bumble.device import Device, Connection
+from bumble import utils
+from bumble.hci import Address
+
 
 # -----------------------------------------------------------------------------
 # Constants
 # -----------------------------------------------------------------------------
-class ErrorCode(OpenIntEnum):
+class ErrorCode(utils.OpenIntEnum):
     '''See Hearing Access Service 2.4. Attribute Profile error codes.'''
 
     INVALID_OPCODE = 0x80
@@ -41,7 +42,7 @@ class ErrorCode(OpenIntEnum):
     INVALID_PARAMETERS_LENGTH = 0x84
 
 
-class HearingAidType(OpenIntEnum):
+class HearingAidType(utils.OpenIntEnum):
     '''See Hearing Access Service 3.1. Hearing Aid Features.'''
 
     BINAURAL_HEARING_AID = 0b00
@@ -49,35 +50,35 @@ class HearingAidType(OpenIntEnum):
     BANDED_HEARING_AID = 0b10
 
 
-class PresetSynchronizationSupport(OpenIntEnum):
+class PresetSynchronizationSupport(utils.OpenIntEnum):
     '''See Hearing Access Service 3.1. Hearing Aid Features.'''
 
     PRESET_SYNCHRONIZATION_IS_NOT_SUPPORTED = 0b0
     PRESET_SYNCHRONIZATION_IS_SUPPORTED = 0b1
 
 
-class IndependentPresets(OpenIntEnum):
+class IndependentPresets(utils.OpenIntEnum):
     '''See Hearing Access Service 3.1. Hearing Aid Features.'''
 
     IDENTICAL_PRESET_RECORD = 0b0
     DIFFERENT_PRESET_RECORD = 0b1
 
 
-class DynamicPresets(OpenIntEnum):
+class DynamicPresets(utils.OpenIntEnum):
     '''See Hearing Access Service 3.1. Hearing Aid Features.'''
 
     PRESET_RECORDS_DOES_NOT_CHANGE = 0b0
     PRESET_RECORDS_MAY_CHANGE = 0b1
 
 
-class WritablePresetsSupport(OpenIntEnum):
+class WritablePresetsSupport(utils.OpenIntEnum):
     '''See Hearing Access Service 3.1. Hearing Aid Features.'''
 
     WRITABLE_PRESET_RECORDS_NOT_SUPPORTED = 0b0
     WRITABLE_PRESET_RECORDS_SUPPORTED = 0b1
 
 
-class HearingAidPresetControlPointOpcode(OpenIntEnum):
+class HearingAidPresetControlPointOpcode(utils.OpenIntEnum):
     '''See Hearing Access Service 3.3.1 Hearing Aid Preset Control Point operation requirements.'''
 
     # fmt: off
@@ -129,7 +130,7 @@ def HearingAidFeatures_from_bytes(data: int) -> HearingAidFeatures:
 class PresetChangedOperation:
     '''See Hearing Access Service 3.2.2.2. Preset Changed operation.'''
 
-    class ChangeId(OpenIntEnum):
+    class ChangeId(utils.OpenIntEnum):
         # fmt: off
         GENERIC_UPDATE            = 0x00
         PRESET_RECORD_DELETED     = 0x01
@@ -189,11 +190,11 @@ class PresetRecord:
 
     @dataclass
     class Property:
-        class Writable(OpenIntEnum):
+        class Writable(utils.OpenIntEnum):
             CANNOT_BE_WRITTEN = 0b0
             CAN_BE_WRITTEN = 0b1
 
-        class IsAvailable(OpenIntEnum):
+        class IsAvailable(utils.OpenIntEnum):
             IS_UNAVAILABLE = 0b0
             IS_AVAILABLE = 0b1
 
@@ -223,9 +224,9 @@ class PresetRecord:
 class HearingAccessService(gatt.TemplateService):
     UUID = gatt.GATT_HEARING_ACCESS_SERVICE
 
-    hearing_aid_features_characteristic: gatt.Characteristic
+    hearing_aid_features_characteristic: gatt.Characteristic[bytes]
-    hearing_aid_preset_control_point: gatt.Characteristic
+    hearing_aid_preset_control_point: gatt.Characteristic[bytes]
-    active_preset_index_characteristic: gatt.Characteristic
+    active_preset_index_characteristic: gatt.Characteristic[bytes]
     active_preset_index: int
     active_preset_index_per_device: Dict[Address, int]
 
@@ -265,13 +266,13 @@ class HearingAccessService(gatt.TemplateService):
         # associate the lowest index as the current active preset at startup
         self.active_preset_index = sorted(self.preset_records.keys())[0]
 
-        @device.on('connection')  # type: ignore
+        @device.on(device.EVENT_CONNECTION)
         def on_connection(connection: Connection) -> None:
-            @connection.on('disconnection')  # type: ignore
+            @connection.on(connection.EVENT_DISCONNECTION)
             def on_disconnection(_reason) -> None:
                 self.currently_connected_clients.remove(connection)
 
-            @connection.on('pairing')  # type: ignore
+            @connection.on(connection.EVENT_PAIRING)
             def on_pairing(*_: Any) -> None:
                 self.on_incoming_paired_connection(connection)
 
@@ -332,7 +333,7 @@ class HearingAccessService(gatt.TemplateService):
             # Update the active preset index if needed
             await self.notify_active_preset_for_connection(connection)
 
-        connection.abort_on('disconnection', on_connection_async())
+        utils.cancel_on_event(connection, 'disconnection', on_connection_async())
 
     def _on_read_active_preset_index(
         self, __connection__: Optional[Connection]
@@ -381,7 +382,7 @@ class HearingAccessService(gatt.TemplateService):
         if len(presets) == 0:
             raise att.ATT_Error(att.ErrorCode.OUT_OF_RANGE)
 
-        AsyncRunner.spawn(self._read_preset_response(connection, presets))
+        utils.AsyncRunner.spawn(self._read_preset_response(connection, presets))
 
     async def _read_preset_response(
         self, connection: Connection, presets: List[PresetRecord]
@@ -631,11 +632,12 @@ class HearingAccessServiceProxy(gatt_client.ProfileServiceProxy):
 
     hearing_aid_preset_control_point: gatt_client.CharacteristicProxy
     preset_control_point_indications: asyncio.Queue
+    active_preset_index_notification: asyncio.Queue
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        self.server_features = gatt.PackedCharacteristicAdapter(
+        self.server_features = gatt_adapters.PackedCharacteristicProxyAdapter(
             service_proxy.get_characteristics_by_uuid(
                 gatt.GATT_HEARING_AID_FEATURES_CHARACTERISTIC
             )[0],
@@ -648,7 +650,7 @@ class HearingAccessServiceProxy(gatt_client.ProfileServiceProxy):
             )[0]
         )
 
-        self.active_preset_index = gatt.PackedCharacteristicAdapter(
+        self.active_preset_index = gatt_adapters.PackedCharacteristicProxyAdapter(
             service_proxy.get_characteristics_by_uuid(
                 gatt.GATT_ACTIVE_PRESET_INDEX_CHARACTERISTIC
             )[0],

bumble/profiles/heart_rate_service.py

@@ -16,13 +16,14 @@
 # -----------------------------------------------------------------------------
 # Imports
 # -----------------------------------------------------------------------------
+from __future__ import annotations
 from enum import IntEnum
 import struct
+from typing import Optional
 
 from bumble import core
-from ..gatt_client import ProfileServiceProxy
+from bumble.att import ATT_Error
-from ..att import ATT_Error
+from bumble.gatt import (
-from ..gatt import (
     GATT_HEART_RATE_SERVICE,
     GATT_HEART_RATE_MEASUREMENT_CHARACTERISTIC,
     GATT_BODY_SENSOR_LOCATION_CHARACTERISTIC,
@@ -30,10 +31,13 @@ from ..gatt import (
     TemplateService,
     Characteristic,
     CharacteristicValue,
-    SerializableCharacteristicAdapter,
+)
+from bumble.gatt_adapters import (
     DelegatedCharacteristicAdapter,
     PackedCharacteristicAdapter,
+    SerializableCharacteristicAdapter,
 )
+from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy
 
 
 # -----------------------------------------------------------------------------
@@ -43,6 +47,10 @@ class HeartRateService(TemplateService):
     CONTROL_POINT_NOT_SUPPORTED = 0x80
     RESET_ENERGY_EXPENDED = 0x01
 
+    heart_rate_measurement_characteristic: Characteristic[HeartRateMeasurement]
+    body_sensor_location_characteristic: Characteristic[BodySensorLocation]
+    heart_rate_control_point_characteristic: Characteristic[int]
+
     class BodySensorLocation(IntEnum):
         OTHER = 0
         CHEST = 1
@@ -198,6 +206,14 @@ class HeartRateService(TemplateService):
 class HeartRateServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = HeartRateService
 
+    heart_rate_measurement: Optional[
+        CharacteristicProxy[HeartRateService.HeartRateMeasurement]
+    ]
+    body_sensor_location: Optional[
+        CharacteristicProxy[HeartRateService.BodySensorLocation]
+    ]
+    heart_rate_control_point: Optional[CharacteristicProxy[int]]
+
     def __init__(self, service_proxy):
         self.service_proxy = service_proxy
 

bumble/profiles/mcp.py

@@ -208,7 +208,7 @@ class MediaControlService(gatt.TemplateService):
             properties=gatt.Characteristic.Properties.READ
             | gatt.Characteristic.Properties.NOTIFY,
             permissions=gatt.Characteristic.Permissions.READ_REQUIRES_ENCRYPTION,
-            value=media_player_name or 'Bumble Player',
+            value=(media_player_name or 'Bumble Player').encode(),
         )
         self.track_changed_characteristic = gatt.Characteristic(
             uuid=gatt.GATT_TRACK_CHANGED_CHARACTERISTIC,
@@ -247,14 +247,16 @@ class MediaControlService(gatt.TemplateService):
             permissions=gatt.Characteristic.Permissions.READ_REQUIRES_ENCRYPTION,
             value=b'',
         )
-        self.media_control_point_characteristic = gatt.Characteristic(
+        self.media_control_point_characteristic: gatt.Characteristic[bytes] = (
-            uuid=gatt.GATT_MEDIA_CONTROL_POINT_CHARACTERISTIC,
+            gatt.Characteristic(
-            properties=gatt.Characteristic.Properties.WRITE
+                uuid=gatt.GATT_MEDIA_CONTROL_POINT_CHARACTERISTIC,
-            | gatt.Characteristic.Properties.WRITE_WITHOUT_RESPONSE
+                properties=gatt.Characteristic.Properties.WRITE
-            | gatt.Characteristic.Properties.NOTIFY,
+                | gatt.Characteristic.Properties.WRITE_WITHOUT_RESPONSE
-            permissions=gatt.Characteristic.Permissions.READ_REQUIRES_ENCRYPTION
+                | gatt.Characteristic.Properties.NOTIFY,
-            | gatt.Characteristic.Permissions.WRITE_REQUIRES_ENCRYPTION,
+                permissions=gatt.Characteristic.Permissions.READ_REQUIRES_ENCRYPTION
-            value=gatt.CharacteristicValue(write=self.on_media_control_point),
+                | gatt.Characteristic.Permissions.WRITE_REQUIRES_ENCRYPTION,
+                value=gatt.CharacteristicValue(write=self.on_media_control_point),
+            )
         )
         self.media_control_point_opcodes_supported_characteristic = gatt.Characteristic(
             uuid=gatt.GATT_MEDIA_CONTROL_POINT_OPCODES_SUPPORTED_CHARACTERISTIC,
@@ -336,30 +338,38 @@ class MediaControlServiceProxy(
         'content_control_id': gatt.GATT_CONTENT_CONTROL_ID_CHARACTERISTIC,
     }
 
-    media_player_name: Optional[gatt_client.CharacteristicProxy] = None
+    EVENT_MEDIA_STATE = "media_state"
-    media_player_icon_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    EVENT_TRACK_CHANGED = "track_changed"
-    media_player_icon_url: Optional[gatt_client.CharacteristicProxy] = None
+    EVENT_TRACK_TITLE = "track_title"
-    track_changed: Optional[gatt_client.CharacteristicProxy] = None
+    EVENT_TRACK_DURATION = "track_duration"
-    track_title: Optional[gatt_client.CharacteristicProxy] = None
+    EVENT_TRACK_POSITION = "track_position"
-    track_duration: Optional[gatt_client.CharacteristicProxy] = None
+
-    track_position: Optional[gatt_client.CharacteristicProxy] = None
+    media_player_name: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    playback_speed: Optional[gatt_client.CharacteristicProxy] = None
+    media_player_icon_object_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    seeking_speed: Optional[gatt_client.CharacteristicProxy] = None
+    media_player_icon_url: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    current_track_segments_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    track_changed: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    current_track_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    track_title: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    next_track_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    track_duration: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    parent_group_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    track_position: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    current_group_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    playback_speed: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    playing_order: Optional[gatt_client.CharacteristicProxy] = None
+    seeking_speed: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    playing_orders_supported: Optional[gatt_client.CharacteristicProxy] = None
+    current_track_segments_object_id: Optional[
-    media_state: Optional[gatt_client.CharacteristicProxy] = None
+        gatt_client.CharacteristicProxy[bytes]
-    media_control_point: Optional[gatt_client.CharacteristicProxy] = None
+    ] = None
-    media_control_point_opcodes_supported: Optional[gatt_client.CharacteristicProxy] = (
+    current_track_object_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-        None
+    next_track_object_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    )
+    parent_group_object_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    search_control_point: Optional[gatt_client.CharacteristicProxy] = None
+    current_group_object_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    search_results_object_id: Optional[gatt_client.CharacteristicProxy] = None
+    playing_order: Optional[gatt_client.CharacteristicProxy[bytes]] = None
-    content_control_id: Optional[gatt_client.CharacteristicProxy] = None
+    playing_orders_supported: Optional[gatt_client.CharacteristicProxy[bytes]] = None
+    media_state: Optional[gatt_client.CharacteristicProxy[bytes]] = None
+    media_control_point: Optional[gatt_client.CharacteristicProxy[bytes]] = None
+    media_control_point_opcodes_supported: Optional[
+        gatt_client.CharacteristicProxy[bytes]
+    ] = None
+    search_control_point: Optional[gatt_client.CharacteristicProxy[bytes]] = None
+    search_results_object_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
+    content_control_id: Optional[gatt_client.CharacteristicProxy[bytes]] = None
 
     if TYPE_CHECKING:
         media_control_point_notifications: asyncio.Queue[bytes]
@@ -428,20 +438,20 @@ class MediaControlServiceProxy(
         self.media_control_point_notifications.put_nowait(data)
 
     def _on_media_state(self, data: bytes) -> None:
-        self.emit('media_state', MediaState(data[0]))
+        self.emit(self.EVENT_MEDIA_STATE, MediaState(data[0]))
 
     def _on_track_changed(self, data: bytes) -> None:
         del data
-        self.emit('track_changed')
+        self.emit(self.EVENT_TRACK_CHANGED)
 
     def _on_track_title(self, data: bytes) -> None:
-        self.emit('track_title', data.decode("utf-8"))
+        self.emit(self.EVENT_TRACK_TITLE, data.decode("utf-8"))
 
     def _on_track_duration(self, data: bytes) -> None:
-        self.emit('track_duration', struct.unpack_from('<i', data)[0])
+        self.emit(self.EVENT_TRACK_DURATION, struct.unpack_from('<i', data)[0])
 
     def _on_track_position(self, data: bytes) -> None:
-        self.emit('track_position', struct.unpack_from('<i', data)[0])
+        self.emit(self.EVENT_TRACK_POSITION, struct.unpack_from('<i', data)[0])
 
 
 class GenericMediaControlServiceProxy(MediaControlServiceProxy):

bumble/profiles/pacs.py

@@ -25,6 +25,7 @@ from typing import Optional, Sequence, Union
 from bumble.profiles.bap import AudioLocation, CodecSpecificCapabilities, ContextType
 from bumble.profiles import le_audio
 from bumble import gatt
+from bumble import gatt_adapters
 from bumble import gatt_client
 from bumble import hci
 
@@ -103,12 +104,12 @@ class PacRecord:
 class PublishedAudioCapabilitiesService(gatt.TemplateService):
     UUID = gatt.GATT_PUBLISHED_AUDIO_CAPABILITIES_SERVICE
 
-    sink_pac: Optional[gatt.Characteristic]
+    sink_pac: Optional[gatt.Characteristic[bytes]]
-    sink_audio_locations: Optional[gatt.Characteristic]
+    sink_audio_locations: Optional[gatt.Characteristic[bytes]]
-    source_pac: Optional[gatt.Characteristic]
+    source_pac: Optional[gatt.Characteristic[bytes]]
-    source_audio_locations: Optional[gatt.Characteristic]
+    source_audio_locations: Optional[gatt.Characteristic[bytes]]
-    available_audio_contexts: gatt.Characteristic
+    available_audio_contexts: gatt.Characteristic[bytes]
-    supported_audio_contexts: gatt.Characteristic
+    supported_audio_contexts: gatt.Characteristic[bytes]
 
     def __init__(
         self,
@@ -185,34 +186,42 @@ class PublishedAudioCapabilitiesService(gatt.TemplateService):
 class PublishedAudioCapabilitiesServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = PublishedAudioCapabilitiesService
 
-    sink_pac: Optional[gatt.DelegatedCharacteristicAdapter] = None
+    sink_pac: Optional[gatt_client.CharacteristicProxy[list[PacRecord]]] = None
-    sink_audio_locations: Optional[gatt.DelegatedCharacteristicAdapter] = None
+    sink_audio_locations: Optional[gatt_client.CharacteristicProxy[AudioLocation]] = (
-    source_pac: Optional[gatt.DelegatedCharacteristicAdapter] = None
+        None
-    source_audio_locations: Optional[gatt.DelegatedCharacteristicAdapter] = None
+    )
-    available_audio_contexts: gatt.DelegatedCharacteristicAdapter
+    source_pac: Optional[gatt_client.CharacteristicProxy[list[PacRecord]]] = None
-    supported_audio_contexts: gatt.DelegatedCharacteristicAdapter
+    source_audio_locations: Optional[gatt_client.CharacteristicProxy[AudioLocation]] = (
+        None
+    )
+    available_audio_contexts: gatt_client.CharacteristicProxy[tuple[ContextType, ...]]
+    supported_audio_contexts: gatt_client.CharacteristicProxy[tuple[ContextType, ...]]
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy):
         self.service_proxy = service_proxy
 
-        self.available_audio_contexts = gatt.DelegatedCharacteristicAdapter(
+        self.available_audio_contexts = (
-            service_proxy.get_required_characteristic_by_uuid(
+            gatt_adapters.DelegatedCharacteristicProxyAdapter(
-                gatt.GATT_AVAILABLE_AUDIO_CONTEXTS_CHARACTERISTIC
+                service_proxy.get_required_characteristic_by_uuid(
-            ),
+                    gatt.GATT_AVAILABLE_AUDIO_CONTEXTS_CHARACTERISTIC
-            decode=lambda x: tuple(map(ContextType, struct.unpack('<HH', x))),
+                ),
+                decode=lambda x: tuple(map(ContextType, struct.unpack('<HH', x))),
+            )
         )
 
-        self.supported_audio_contexts = gatt.DelegatedCharacteristicAdapter(
+        self.supported_audio_contexts = (
-            service_proxy.get_required_characteristic_by_uuid(
+            gatt_adapters.DelegatedCharacteristicProxyAdapter(
-                gatt.GATT_SUPPORTED_AUDIO_CONTEXTS_CHARACTERISTIC
+                service_proxy.get_required_characteristic_by_uuid(
-            ),
+                    gatt.GATT_SUPPORTED_AUDIO_CONTEXTS_CHARACTERISTIC
-            decode=lambda x: tuple(map(ContextType, struct.unpack('<HH', x))),
+                ),
+                decode=lambda x: tuple(map(ContextType, struct.unpack('<HH', x))),
+            )
         )
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             gatt.GATT_SINK_PAC_CHARACTERISTIC
         ):
-            self.sink_pac = gatt.DelegatedCharacteristicAdapter(
+            self.sink_pac = gatt_adapters.DelegatedCharacteristicProxyAdapter(
                 characteristics[0],
                 decode=PacRecord.list_from_bytes,
             )
@@ -220,7 +229,7 @@ class PublishedAudioCapabilitiesServiceProxy(gatt_client.ProfileServiceProxy):
         if characteristics := service_proxy.get_characteristics_by_uuid(
             gatt.GATT_SOURCE_PAC_CHARACTERISTIC
         ):
-            self.source_pac = gatt.DelegatedCharacteristicAdapter(
+            self.source_pac = gatt_adapters.DelegatedCharacteristicProxyAdapter(
                 characteristics[0],
                 decode=PacRecord.list_from_bytes,
             )
@@ -228,15 +237,19 @@ class PublishedAudioCapabilitiesServiceProxy(gatt_client.ProfileServiceProxy):
         if characteristics := service_proxy.get_characteristics_by_uuid(
             gatt.GATT_SINK_AUDIO_LOCATION_CHARACTERISTIC
         ):
-            self.sink_audio_locations = gatt.DelegatedCharacteristicAdapter(
+            self.sink_audio_locations = (
-                characteristics[0],
+                gatt_adapters.DelegatedCharacteristicProxyAdapter(
-                decode=lambda x: AudioLocation(struct.unpack('<I', x)[0]),
+                    characteristics[0],
+                    decode=lambda x: AudioLocation(struct.unpack('<I', x)[0]),
+                )
             )
 
         if characteristics := service_proxy.get_characteristics_by_uuid(
             gatt.GATT_SOURCE_AUDIO_LOCATION_CHARACTERISTIC
         ):
-            self.source_audio_locations = gatt.DelegatedCharacteristicAdapter(
+            self.source_audio_locations = (
-                characteristics[0],
+                gatt_adapters.DelegatedCharacteristicProxyAdapter(
-                decode=lambda x: AudioLocation(struct.unpack('<I', x)[0]),
+                    characteristics[0],
+                    decode=lambda x: AudioLocation(struct.unpack('<I', x)[0]),
+                )
             )

bumble/profiles/pbp.py

@@ -40,7 +40,7 @@ class PublicBroadcastAnnouncement:
     def from_bytes(cls, data: bytes) -> Self:
         features = cls.Features(data[0])
         metadata_length = data[1]
-        metadata_ltv = data[1 : 1 + metadata_length]
+        metadata_ltv = data[2 : 2 + metadata_length]
         return cls(
             features=features, metadata=le_audio.Metadata.from_bytes(metadata_ltv)
         )

bumble/profiles/tmap.py

@@ -24,11 +24,11 @@ import struct
 from bumble.gatt import (
     TemplateService,
     Characteristic,
-    DelegatedCharacteristicAdapter,
     GATT_TELEPHONY_AND_MEDIA_AUDIO_SERVICE,
     GATT_TMAP_ROLE_CHARACTERISTIC,
 )
-from bumble.gatt_client import ProfileServiceProxy, ServiceProxy
+from bumble.gatt_adapters import DelegatedCharacteristicProxyAdapter
+from bumble.gatt_client import CharacteristicProxy, ProfileServiceProxy, ServiceProxy
 
 
 # -----------------------------------------------------------------------------
@@ -53,6 +53,8 @@ class Role(enum.IntFlag):
 class TelephonyAndMediaAudioService(TemplateService):
     UUID = GATT_TELEPHONY_AND_MEDIA_AUDIO_SERVICE
 
+    role_characteristic: Characteristic[bytes]
+
     def __init__(self, role: Role):
         self.role_characteristic = Characteristic(
             GATT_TMAP_ROLE_CHARACTERISTIC,
@@ -68,12 +70,12 @@ class TelephonyAndMediaAudioService(TemplateService):
 class TelephonyAndMediaAudioServiceProxy(ProfileServiceProxy):
     SERVICE_CLASS = TelephonyAndMediaAudioService
 
-    role: DelegatedCharacteristicAdapter
+    role: CharacteristicProxy[Role]
 
     def __init__(self, service_proxy: ServiceProxy):
         self.service_proxy = service_proxy
 
-        self.role = DelegatedCharacteristicAdapter(
+        self.role = DelegatedCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_TMAP_ROLE_CHARACTERISTIC
             ),

bumble/profiles/vcs.py

@@ -23,8 +23,10 @@ import enum
 from typing import Optional, Sequence
 
 from bumble import att
+from bumble import utils
 from bumble import device
 from bumble import gatt
+from bumble import gatt_adapters
 from bumble import gatt_client
 
 
@@ -89,9 +91,11 @@ class VolumeState:
 class VolumeControlService(gatt.TemplateService):
     UUID = gatt.GATT_VOLUME_CONTROL_SERVICE
 
-    volume_state: gatt.Characteristic
+    EVENT_VOLUME_STATE_CHANGE = "volume_state_change"
-    volume_control_point: gatt.Characteristic
+
-    volume_flags: gatt.Characteristic
+    volume_state: gatt.Characteristic[bytes]
+    volume_control_point: gatt.Characteristic[bytes]
+    volume_flags: gatt.Characteristic[bytes]
 
     volume_setting: int
     muted: int
@@ -159,11 +163,12 @@ class VolumeControlService(gatt.TemplateService):
         handler = getattr(self, '_on_' + opcode.name.lower())
         if handler(*value[2:]):
             self.change_counter = (self.change_counter + 1) % 256
-            connection.abort_on(
+            utils.cancel_on_event(
+                connection,
                 'disconnection',
                 connection.device.notify_subscribers(attribute=self.volume_state),
             )
-            self.emit('volume_state_change')
+            self.emit(self.EVENT_VOLUME_STATE_CHANGE)
 
     def _on_relative_volume_down(self) -> bool:
         old_volume = self.volume_setting
@@ -209,14 +214,14 @@ class VolumeControlService(gatt.TemplateService):
 class VolumeControlServiceProxy(gatt_client.ProfileServiceProxy):
     SERVICE_CLASS = VolumeControlService
 
-    volume_control_point: gatt_client.CharacteristicProxy
+    volume_control_point: gatt_client.CharacteristicProxy[bytes]
-    volume_state: gatt.SerializableCharacteristicAdapter
+    volume_state: gatt_client.CharacteristicProxy[VolumeState]
-    volume_flags: gatt.DelegatedCharacteristicAdapter
+    volume_flags: gatt_client.CharacteristicProxy[VolumeFlags]
 
     def __init__(self, service_proxy: gatt_client.ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        self.volume_state = gatt.SerializableCharacteristicAdapter(
+        self.volume_state = gatt_adapters.SerializableCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 gatt.GATT_VOLUME_STATE_CHARACTERISTIC
             ),
@@ -227,7 +232,7 @@ class VolumeControlServiceProxy(gatt_client.ProfileServiceProxy):
             gatt.GATT_VOLUME_CONTROL_POINT_CHARACTERISTIC
         )
 
-        self.volume_flags = gatt.DelegatedCharacteristicAdapter(
+        self.volume_flags = gatt_adapters.DelegatedCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 gatt.GATT_VOLUME_FLAGS_CHARACTERISTIC
             ),

bumble/profiles/vocs.py

@@ -24,19 +24,21 @@ from bumble.device import Connection
 from bumble.att import ATT_Error
 from bumble.gatt import (
     Characteristic,
-    DelegatedCharacteristicAdapter,
     TemplateService,
     CharacteristicValue,
-    SerializableCharacteristicAdapter,
-    UTF8CharacteristicAdapter,
     GATT_VOLUME_OFFSET_CONTROL_SERVICE,
     GATT_VOLUME_OFFSET_STATE_CHARACTERISTIC,
     GATT_AUDIO_LOCATION_CHARACTERISTIC,
     GATT_VOLUME_OFFSET_CONTROL_POINT_CHARACTERISTIC,
     GATT_AUDIO_OUTPUT_DESCRIPTION_CHARACTERISTIC,
 )
+from bumble.gatt_adapters import (
+    DelegatedCharacteristicProxyAdapter,
+    SerializableCharacteristicProxyAdapter,
+    UTF8CharacteristicProxyAdapter,
+)
 from bumble.gatt_client import ProfileServiceProxy, ServiceProxy
-from bumble.utils import OpenIntEnum
+from bumble import utils
 from bumble.profiles.bap import AudioLocation
 
 # -----------------------------------------------------------------------------
@@ -48,11 +50,11 @@ MAX_VOLUME_OFFSET = 255
 CHANGE_COUNTER_MAX_VALUE = 0xFF
 
 
-class SetVolumeOffsetOpCode(OpenIntEnum):
+class SetVolumeOffsetOpCode(utils.OpenIntEnum):
     SET_VOLUME_OFFSET = 0x01
 
 
-class ErrorCode(OpenIntEnum):
+class ErrorCode(utils.OpenIntEnum):
     """
     See Volume Offset Control Service 1.6. Application error codes.
     """
@@ -67,7 +69,7 @@ class ErrorCode(OpenIntEnum):
 class VolumeOffsetState:
     volume_offset: int = 0
     change_counter: int = 0
-    attribute_value: Optional[CharacteristicValue] = None
+    attribute: Optional[Characteristic] = None
 
     def __bytes__(self) -> bytes:
         return struct.pack('<hB', self.volume_offset, self.change_counter)
@@ -81,8 +83,8 @@ class VolumeOffsetState:
         self.change_counter = (self.change_counter + 1) % (CHANGE_COUNTER_MAX_VALUE + 1)
 
     async def notify_subscribers_via_connection(self, connection: Connection) -> None:
-        assert self.attribute_value is not None
+        assert self.attribute is not None
-        await connection.device.notify_subscribers(attribute=self.attribute_value)
+        await connection.device.notify_subscribers(attribute=self.attribute)
 
     def on_read(self, _connection: Optional[Connection]) -> bytes:
         return bytes(self)
@@ -91,7 +93,7 @@ class VolumeOffsetState:
 @dataclass
 class VocsAudioLocation:
     audio_location: AudioLocation = AudioLocation.NOT_ALLOWED
-    attribute_value: Optional[CharacteristicValue] = None
+    attribute: Optional[Characteristic] = None
 
     def __bytes__(self) -> bytes:
         return struct.pack('<I', self.audio_location)
@@ -106,10 +108,10 @@ class VocsAudioLocation:
 
     async def on_write(self, connection: Optional[Connection], value: bytes) -> None:
         assert connection
-        assert self.attribute_value
+        assert self.attribute
 
         self.audio_location = AudioLocation(int.from_bytes(value, 'little'))
-        await connection.device.notify_subscribers(attribute=self.attribute_value)
+        await connection.device.notify_subscribers(attribute=self.attribute)
 
 
 @dataclass
@@ -148,7 +150,7 @@ class VolumeOffsetControlPoint:
 @dataclass
 class AudioOutputDescription:
     audio_output_description: str = ''
-    attribute_value: Optional[CharacteristicValue] = None
+    attribute: Optional[Characteristic] = None
 
     @classmethod
     def from_bytes(cls, data: bytes):
@@ -162,10 +164,10 @@ class AudioOutputDescription:
 
     async def on_write(self, connection: Optional[Connection], value: bytes) -> None:
         assert connection
-        assert self.attribute_value
+        assert self.attribute
 
         self.audio_output_description = value.decode('utf-8')
-        await connection.device.notify_subscribers(attribute=self.attribute_value)
+        await connection.device.notify_subscribers(attribute=self.attribute)
 
 
 # -----------------------------------------------------------------------------
@@ -197,7 +199,7 @@ class VolumeOffsetControlService(TemplateService):
             VolumeOffsetControlPoint(self.volume_offset_state)
         )
 
-        self.volume_offset_state_characteristic = Characteristic(
+        self.volume_offset_state_characteristic: Characteristic[bytes] = Characteristic(
             uuid=GATT_VOLUME_OFFSET_STATE_CHARACTERISTIC,
             properties=(
                 Characteristic.Properties.READ | Characteristic.Properties.NOTIFY
@@ -206,7 +208,7 @@ class VolumeOffsetControlService(TemplateService):
             value=CharacteristicValue(read=self.volume_offset_state.on_read),
         )
 
-        self.audio_location_characteristic = Characteristic(
+        self.audio_location_characteristic: Characteristic[bytes] = Characteristic(
             uuid=GATT_AUDIO_LOCATION_CHARACTERISTIC,
             properties=(
                 Characteristic.Properties.READ
@@ -222,33 +224,39 @@ class VolumeOffsetControlService(TemplateService):
                 write=self.audio_location.on_write,
             ),
         )
-        self.audio_location.attribute_value = self.audio_location_characteristic.value
+        self.audio_location.attribute = self.audio_location_characteristic
 
-        self.volume_offset_control_point_characteristic = Characteristic(
+        self.volume_offset_control_point_characteristic: Characteristic[bytes] = (
-            uuid=GATT_VOLUME_OFFSET_CONTROL_POINT_CHARACTERISTIC,
+            Characteristic(
-            properties=Characteristic.Properties.WRITE,
+                uuid=GATT_VOLUME_OFFSET_CONTROL_POINT_CHARACTERISTIC,
-            permissions=Characteristic.Permissions.WRITE_REQUIRES_ENCRYPTION,
+                properties=Characteristic.Properties.WRITE,
-            value=CharacteristicValue(write=self.volume_offset_control_point.on_write),
+                permissions=Characteristic.Permissions.WRITE_REQUIRES_ENCRYPTION,
+                value=CharacteristicValue(
+                    write=self.volume_offset_control_point.on_write
+                ),
+            )
         )
 
-        self.audio_output_description_characteristic = Characteristic(
+        self.audio_output_description_characteristic: Characteristic[bytes] = (
-            uuid=GATT_AUDIO_OUTPUT_DESCRIPTION_CHARACTERISTIC,
+            Characteristic(
-            properties=(
+                uuid=GATT_AUDIO_OUTPUT_DESCRIPTION_CHARACTERISTIC,
-                Characteristic.Properties.READ
+                properties=(
-                | Characteristic.Properties.NOTIFY
+                    Characteristic.Properties.READ
-                | Characteristic.Properties.WRITE_WITHOUT_RESPONSE
+                    | Characteristic.Properties.NOTIFY
-            ),
+                    | Characteristic.Properties.WRITE_WITHOUT_RESPONSE
-            permissions=(
+                ),
-                Characteristic.Permissions.READ_REQUIRES_ENCRYPTION
+                permissions=(
-                | Characteristic.Permissions.WRITE_REQUIRES_ENCRYPTION
+                    Characteristic.Permissions.READ_REQUIRES_ENCRYPTION
-            ),
+                    | Characteristic.Permissions.WRITE_REQUIRES_ENCRYPTION
-            value=CharacteristicValue(
+                ),
-                read=self.audio_output_description.on_read,
+                value=CharacteristicValue(
-                write=self.audio_output_description.on_write,
+                    read=self.audio_output_description.on_read,
-            ),
+                    write=self.audio_output_description.on_write,
+                ),
+            )
         )
-        self.audio_output_description.attribute_value = (
+        self.audio_output_description.attribute = (
-            self.audio_output_description_characteristic.value
+            self.audio_output_description_characteristic
         )
 
         super().__init__(
@@ -271,14 +279,14 @@ class VolumeOffsetControlServiceProxy(ProfileServiceProxy):
     def __init__(self, service_proxy: ServiceProxy) -> None:
         self.service_proxy = service_proxy
 
-        self.volume_offset_state = SerializableCharacteristicAdapter(
+        self.volume_offset_state = SerializableCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_VOLUME_OFFSET_STATE_CHARACTERISTIC
             ),
             VolumeOffsetState,
         )
 
-        self.audio_location = DelegatedCharacteristicAdapter(
+        self.audio_location = DelegatedCharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_AUDIO_LOCATION_CHARACTERISTIC
             ),
@@ -292,7 +300,7 @@ class VolumeOffsetControlServiceProxy(ProfileServiceProxy):
             )
         )
 
-        self.audio_output_description = UTF8CharacteristicAdapter(
+        self.audio_output_description = UTF8CharacteristicProxyAdapter(
             service_proxy.get_required_characteristic_by_uuid(
                 GATT_AUDIO_OUTPUT_DESCRIPTION_CHARACTERISTIC
             )

bumble/rfcomm.py

@@ -25,16 +25,16 @@ import enum
 from typing import Callable, Dict, List, Optional, Tuple, Union, TYPE_CHECKING
 from typing_extensions import Self
 
-from pyee import EventEmitter
 
 from bumble import core
 from bumble import l2cap
 from bumble import sdp
-from .colors import color
+from bumble import utils
-from .core import (
+from bumble.colors import color
+from bumble.core import (
     UUID,
     BT_RFCOMM_PROTOCOL_ID,
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
     BT_L2CAP_PROTOCOL_ID,
     InvalidArgumentError,
     InvalidStateError,
@@ -441,7 +441,10 @@ class RFCOMM_MCC_MSC:
 
 
 # -----------------------------------------------------------------------------
-class DLC(EventEmitter):
+class DLC(utils.EventEmitter):
+    EVENT_OPEN = "open"
+    EVENT_CLOSE = "close"
+
     class State(enum.IntEnum):
         INIT = 0x00
         CONNECTING = 0x01
@@ -529,7 +532,7 @@ class DLC(EventEmitter):
         self.send_frame(RFCOMM_Frame.uih(c_r=self.c_r, dlci=0, information=mcc))
 
         self.change_state(DLC.State.CONNECTED)
-        self.emit('open')
+        self.emit(self.EVENT_OPEN)
 
     def on_ua_frame(self, _frame: RFCOMM_Frame) -> None:
         if self.state == DLC.State.CONNECTING:
@@ -550,7 +553,7 @@ class DLC(EventEmitter):
                 self.disconnection_result.set_result(None)
                 self.disconnection_result = None
             self.multiplexer.on_dlc_disconnection(self)
-            self.emit('close')
+            self.emit(self.EVENT_CLOSE)
         else:
             logger.warning(
                 color(
@@ -733,7 +736,7 @@ class DLC(EventEmitter):
             self.disconnection_result.cancel()
             self.disconnection_result = None
         self.change_state(DLC.State.RESET)
-        self.emit('close')
+        self.emit(self.EVENT_CLOSE)
 
     def __str__(self) -> str:
         return (
@@ -749,7 +752,7 @@ class DLC(EventEmitter):
 
 
 # -----------------------------------------------------------------------------
-class Multiplexer(EventEmitter):
+class Multiplexer(utils.EventEmitter):
     class Role(enum.IntEnum):
         INITIATOR = 0x00
         RESPONDER = 0x01
@@ -763,6 +766,8 @@ class Multiplexer(EventEmitter):
         DISCONNECTED = 0x05
         RESET = 0x06
 
+    EVENT_DLC = "dlc"
+
     connection_result: Optional[asyncio.Future]
     disconnection_result: Optional[asyncio.Future]
     open_result: Optional[asyncio.Future]
@@ -785,7 +790,7 @@ class Multiplexer(EventEmitter):
         # Become a sink for the L2CAP channel
         l2cap_channel.sink = self.on_pdu
 
-        l2cap_channel.on('close', self.on_l2cap_channel_close)
+        l2cap_channel.on(l2cap_channel.EVENT_CLOSE, self.on_l2cap_channel_close)
 
     def change_state(self, new_state: State) -> None:
         logger.debug(f'{self} state change -> {color(new_state.name, "cyan")}')
@@ -845,7 +850,7 @@ class Multiplexer(EventEmitter):
                 self.open_result.set_exception(
                     core.ConnectionError(
                         core.ConnectionError.CONNECTION_REFUSED,
-                        BT_BR_EDR_TRANSPORT,
+                        PhysicalTransport.BR_EDR,
                         self.l2cap_channel.connection.peer_address,
                         'rfcomm',
                     )
@@ -901,7 +906,7 @@ class Multiplexer(EventEmitter):
                         self.dlcs[pn.dlci] = dlc
 
                         # Re-emit the handshake completion event
-                        dlc.on('open', lambda: self.emit('dlc', dlc))
+                        dlc.on(dlc.EVENT_OPEN, lambda: self.emit(self.EVENT_DLC, dlc))
 
                         # Respond to complete the handshake
                         dlc.accept()
@@ -1075,7 +1080,9 @@ class Client:
 
 
 # -----------------------------------------------------------------------------
-class Server(EventEmitter):
+class Server(utils.EventEmitter):
+    EVENT_START = "start"
+
     def __init__(
         self, device: Device, l2cap_mtu: int = RFCOMM_DEFAULT_L2CAP_MTU
     ) -> None:
@@ -1122,7 +1129,9 @@ class Server(EventEmitter):
 
     def on_connection(self, l2cap_channel: l2cap.ClassicChannel) -> None:
         logger.debug(f'+++ new L2CAP connection: {l2cap_channel}')
-        l2cap_channel.on('open', lambda: self.on_l2cap_channel_open(l2cap_channel))
+        l2cap_channel.on(
+            l2cap_channel.EVENT_OPEN, lambda: self.on_l2cap_channel_open(l2cap_channel)
+        )
 
     def on_l2cap_channel_open(self, l2cap_channel: l2cap.ClassicChannel) -> None:
         logger.debug(f'$$$ L2CAP channel open: {l2cap_channel}')
@@ -1130,10 +1139,10 @@ class Server(EventEmitter):
         # Create a new multiplexer for the channel
         multiplexer = Multiplexer(l2cap_channel, Multiplexer.Role.RESPONDER)
         multiplexer.acceptor = self.accept_dlc
-        multiplexer.on('dlc', self.on_dlc)
+        multiplexer.on(multiplexer.EVENT_DLC, self.on_dlc)
 
         # Notify
-        self.emit('start', multiplexer)
+        self.emit(self.EVENT_START, multiplexer)
 
     def accept_dlc(self, channel_number: int) -> Optional[Tuple[int, int]]:
         return self.dlc_configs.get(channel_number)

bumble/sdp.py

@@ -33,7 +33,7 @@ from bumble.core import (
 from bumble.hci import HCI_Object, name_or_number, key_with_value
 
 if TYPE_CHECKING:
-    from .device import Device, Connection
+    from bumble.device import Device, Connection
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -130,7 +130,7 @@ SDP_ATTRIBUTE_ID_NAMES = {
 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
+SDP_ALL_ATTRIBUTES_RANGE = (0x0000, 0xFFFF)
 
 # fmt: on
 # pylint: enable=line-too-long

bumble/smp.py

@@ -41,26 +41,25 @@ from typing import (
     cast,
 )
 
-from pyee import EventEmitter
 
-from .colors import color
+from bumble.colors import color
-from .hci import (
+from bumble.hci import (
     Address,
+    Role,
     HCI_LE_Enable_Encryption_Command,
     HCI_Object,
     key_with_value,
 )
-from .core import (
+from bumble.core import (
-    BT_BR_EDR_TRANSPORT,
+    PhysicalTransport,
-    BT_CENTRAL_ROLE,
-    BT_LE_TRANSPORT,
     AdvertisingData,
     InvalidArgumentError,
     ProtocolError,
     name_or_number,
 )
-from .keys import PairingKeys
+from bumble.keys import PairingKeys
-from . import crypto
+from bumble import crypto
+from bumble import utils
 
 if TYPE_CHECKING:
     from bumble.device import Connection, Device
@@ -725,12 +724,13 @@ class Session:
         self.is_responder = not self.is_initiator
 
         # Listen for connection events
-        connection.on('disconnection', self.on_disconnection)
+        connection.on(connection.EVENT_DISCONNECTION, self.on_disconnection)
         connection.on(
-            'connection_encryption_change', self.on_connection_encryption_change
+            connection.EVENT_CONNECTION_ENCRYPTION_CHANGE,
+            self.on_connection_encryption_change,
         )
         connection.on(
-            'connection_encryption_key_refresh',
+            connection.EVENT_CONNECTION_ENCRYPTION_KEY_REFRESH,
             self.on_connection_encryption_key_refresh,
         )
 
@@ -857,7 +857,7 @@ class Session:
         initiator_io_capability: int,
         responder_io_capability: int,
     ) -> None:
-        if self.connection.transport == BT_BR_EDR_TRANSPORT:
+        if self.connection.transport == PhysicalTransport.BR_EDR:
             self.pairing_method = PairingMethod.CTKD_OVER_CLASSIC
             return
         if (not self.mitm) and (auth_req & SMP_MITM_AUTHREQ == 0):
@@ -900,7 +900,7 @@ class Session:
 
             self.send_pairing_failed(SMP_CONFIRM_VALUE_FAILED_ERROR)
 
-        self.connection.abort_on('disconnection', prompt())
+        utils.cancel_on_event(self.connection, 'disconnection', prompt())
 
     def prompt_user_for_numeric_comparison(
         self, code: int, next_steps: Callable[[], None]
@@ -919,7 +919,7 @@ class Session:
 
             self.send_pairing_failed(SMP_CONFIRM_VALUE_FAILED_ERROR)
 
-        self.connection.abort_on('disconnection', prompt())
+        utils.cancel_on_event(self.connection, 'disconnection', prompt())
 
     def prompt_user_for_number(self, next_steps: Callable[[int], None]) -> None:
         async def prompt() -> None:
@@ -936,7 +936,7 @@ class Session:
                 logger.warning(f'exception while prompting: {error}')
                 self.send_pairing_failed(SMP_PASSKEY_ENTRY_FAILED_ERROR)
 
-        self.connection.abort_on('disconnection', prompt())
+        utils.cancel_on_event(self.connection, 'disconnection', prompt())
 
     def display_passkey(self) -> None:
         # Generate random Passkey/PIN code
@@ -951,7 +951,8 @@ class Session:
             logger.debug(f'TK from passkey = {self.tk.hex()}')
 
         try:
-            self.connection.abort_on(
+            utils.cancel_on_event(
+                self.connection,
                 'disconnection',
                 self.pairing_config.delegate.display_number(self.passkey, digits=6),
             )
@@ -1050,7 +1051,7 @@ class Session:
                 )
 
             # Perform the next steps asynchronously in case we need to wait for input
-            self.connection.abort_on('disconnection', next_steps())
+            utils.cancel_on_event(self.connection, 'disconnection', next_steps())
         else:
             confirm_value = crypto.c1(
                 self.tk,
@@ -1170,11 +1171,11 @@ class Session:
         if self.is_initiator:
             # CTKD: Derive LTK from LinkKey
             if (
-                self.connection.transport == BT_BR_EDR_TRANSPORT
+                self.connection.transport == PhysicalTransport.BR_EDR
                 and self.initiator_key_distribution & SMP_ENC_KEY_DISTRIBUTION_FLAG
             ):
-                self.ctkd_task = self.connection.abort_on(
+                self.ctkd_task = utils.cancel_on_event(
-                    'disconnection', self.get_link_key_and_derive_ltk()
+                    self.connection, 'disconnection', self.get_link_key_and_derive_ltk()
                 )
             elif not self.sc:
                 # Distribute the LTK, EDIV and RAND
@@ -1209,11 +1210,11 @@ class Session:
         else:
             # CTKD: Derive LTK from LinkKey
             if (
-                self.connection.transport == BT_BR_EDR_TRANSPORT
+                self.connection.transport == PhysicalTransport.BR_EDR
                 and self.responder_key_distribution & SMP_ENC_KEY_DISTRIBUTION_FLAG
             ):
-                self.ctkd_task = self.connection.abort_on(
+                self.ctkd_task = utils.cancel_on_event(
-                    'disconnection', self.get_link_key_and_derive_ltk()
+                    self.connection, 'disconnection', self.get_link_key_and_derive_ltk()
                 )
             # Distribute the LTK, EDIV and RAND
             elif not self.sc:
@@ -1248,7 +1249,7 @@ class Session:
     def compute_peer_expected_distributions(self, key_distribution_flags: int) -> None:
         # Set our expectations for what to wait for in the key distribution phase
         self.peer_expected_distributions = []
-        if not self.sc and self.connection.transport == BT_LE_TRANSPORT:
+        if not self.sc and self.connection.transport == PhysicalTransport.LE:
             if key_distribution_flags & SMP_ENC_KEY_DISTRIBUTION_FLAG != 0:
                 self.peer_expected_distributions.append(
                     SMP_Encryption_Information_Command
@@ -1305,15 +1306,20 @@ class Session:
 
         # Wait for the pairing process to finish
         assert self.pairing_result
-        await self.connection.abort_on('disconnection', self.pairing_result)
+        await utils.cancel_on_event(
+            self.connection, 'disconnection', self.pairing_result
+        )
 
     def on_disconnection(self, _: int) -> None:
-        self.connection.remove_listener('disconnection', self.on_disconnection)
         self.connection.remove_listener(
-            'connection_encryption_change', self.on_connection_encryption_change
+            self.connection.EVENT_DISCONNECTION, self.on_disconnection
         )
         self.connection.remove_listener(
-            'connection_encryption_key_refresh',
+            self.connection.EVENT_CONNECTION_ENCRYPTION_CHANGE,
+            self.on_connection_encryption_change,
+        )
+        self.connection.remove_listener(
+            self.connection.EVENT_CONNECTION_ENCRYPTION_KEY_REFRESH,
             self.on_connection_encryption_key_refresh,
         )
         self.manager.on_session_end(self)
@@ -1323,10 +1329,10 @@ class Session:
         if self.is_initiator:
             self.distribute_keys()
 
-        self.connection.abort_on('disconnection', self.on_pairing())
+        utils.cancel_on_event(self.connection, 'disconnection', self.on_pairing())
 
     def on_connection_encryption_change(self) -> None:
-        if self.connection.is_encrypted:
+        if self.connection.is_encrypted and not self.completed:
             if self.is_responder:
                 # The responder distributes its keys first, the initiator later
                 self.distribute_keys()
@@ -1365,7 +1371,7 @@ class Session:
         keys = PairingKeys()
         keys.address_type = peer_address.address_type
         authenticated = self.pairing_method != PairingMethod.JUST_WORKS
-        if self.sc or self.connection.transport == BT_BR_EDR_TRANSPORT:
+        if self.sc or self.connection.transport == PhysicalTransport.BR_EDR:
             keys.ltk = PairingKeys.Key(value=self.ltk, authenticated=authenticated)
         else:
             our_ltk_key = PairingKeys.Key(
@@ -1432,8 +1438,10 @@ class Session:
     def on_smp_pairing_request_command(
         self, command: SMP_Pairing_Request_Command
     ) -> None:
-        self.connection.abort_on(
+        utils.cancel_on_event(
-            'disconnection', self.on_smp_pairing_request_command_async(command)
+            self.connection,
+            'disconnection',
+            self.on_smp_pairing_request_command_async(command),
         )
 
     async def on_smp_pairing_request_command_async(
@@ -1506,7 +1514,7 @@ class Session:
         # CTKD over BR/EDR should happen after the connection has been encrypted,
         # so when receiving pairing requests, responder should start distributing keys
         if (
-            self.connection.transport == BT_BR_EDR_TRANSPORT
+            self.connection.transport == PhysicalTransport.BR_EDR
             and self.connection.is_encrypted
             and self.is_responder
             and accepted
@@ -1878,7 +1886,7 @@ class Session:
                     self.wait_before_continuing = None
                     self.send_pairing_dhkey_check_command()
 
-                self.connection.abort_on('disconnection', next_steps())
+                utils.cancel_on_event(self.connection, 'disconnection', next_steps())
             else:
                 self.send_pairing_dhkey_check_command()
         else:
@@ -1922,7 +1930,7 @@ class Session:
 
 
 # -----------------------------------------------------------------------------
-class Manager(EventEmitter):
+class Manager(utils.EventEmitter):
     '''
     Implements the Initiator and Responder roles of the Security Manager Protocol
     '''
@@ -1950,13 +1958,15 @@ class Manager(EventEmitter):
             f'>>> Sending SMP Command on connection [0x{connection.handle:04X}] '
             f'{connection.peer_address}: {command}'
         )
-        cid = SMP_BR_CID if connection.transport == BT_BR_EDR_TRANSPORT else SMP_CID
+        cid = (
+            SMP_BR_CID if connection.transport == PhysicalTransport.BR_EDR else SMP_CID
+        )
         connection.send_l2cap_pdu(cid, bytes(command))
 
     def on_smp_security_request_command(
         self, connection: Connection, request: SMP_Security_Request_Command
     ) -> None:
-        connection.emit('security_request', request.auth_req)
+        connection.emit(connection.EVENT_SECURITY_REQUEST, request.auth_req)
 
     def on_smp_pdu(self, connection: Connection, pdu: bytes) -> None:
         # Parse the L2CAP payload into an SMP Command object
@@ -1975,7 +1985,7 @@ class Manager(EventEmitter):
 
         # Look for a session with this connection, and create one if none exists
         if not (session := self.sessions.get(connection.handle)):
-            if connection.role == BT_CENTRAL_ROLE:
+            if connection.role == Role.CENTRAL:
                 logger.warning('Remote starts pairing as Peripheral!')
             pairing_config = self.pairing_config_factory(connection)
             session = self.session_proxy(
@@ -1995,7 +2005,7 @@ class Manager(EventEmitter):
 
     async def pair(self, connection: Connection) -> None:
         # TODO: check if there's already a session for this connection
-        if connection.role != BT_CENTRAL_ROLE:
+        if connection.role != Role.CENTRAL:
             logger.warning('Start pairing as Peripheral!')
         pairing_config = self.pairing_config_factory(connection)
         session = self.session_proxy(

bumble/transport/__init__.py

@@ -20,8 +20,13 @@ import logging
 import os
 from typing import Optional
 
-from .common import Transport, AsyncPipeSink, SnoopingTransport, TransportSpecError
+from bumble.transport.common import (
-from ..snoop import create_snooper
+    Transport,
+    AsyncPipeSink,
+    SnoopingTransport,
+    TransportSpecError,
+)
+from bumble.snoop import create_snooper
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -108,80 +113,80 @@ async def _open_transport(scheme: str, spec: Optional[str]) -> Transport:
     # pylint: disable=too-many-return-statements
 
     if scheme == 'serial' and spec:
-        from .serial import open_serial_transport
+        from bumble.transport.serial import open_serial_transport
 
         return await open_serial_transport(spec)
 
     if scheme == 'udp' and spec:
-        from .udp import open_udp_transport
+        from bumble.transport.udp import open_udp_transport
 
         return await open_udp_transport(spec)
 
     if scheme == 'tcp-client' and spec:
-        from .tcp_client import open_tcp_client_transport
+        from bumble.transport.tcp_client import open_tcp_client_transport
 
         return await open_tcp_client_transport(spec)
 
     if scheme == 'tcp-server' and spec:
-        from .tcp_server import open_tcp_server_transport
+        from bumble.transport.tcp_server import open_tcp_server_transport
 
         return await open_tcp_server_transport(spec)
 
     if scheme == 'ws-client' and spec:
-        from .ws_client import open_ws_client_transport
+        from bumble.transport.ws_client import open_ws_client_transport
 
         return await open_ws_client_transport(spec)
 
     if scheme == 'ws-server' and spec:
-        from .ws_server import open_ws_server_transport
+        from bumble.transport.ws_server import open_ws_server_transport
 
         return await open_ws_server_transport(spec)
 
     if scheme == 'pty':
-        from .pty import open_pty_transport
+        from bumble.transport.pty import open_pty_transport
 
         return await open_pty_transport(spec)
 
     if scheme == 'file':
-        from .file import open_file_transport
+        from bumble.transport.file import open_file_transport
 
         assert spec is not None
         return await open_file_transport(spec)
 
     if scheme == 'vhci':
-        from .vhci import open_vhci_transport
+        from bumble.transport.vhci import open_vhci_transport
 
         return await open_vhci_transport(spec)
 
     if scheme == 'hci-socket':
-        from .hci_socket import open_hci_socket_transport
+        from bumble.transport.hci_socket import open_hci_socket_transport
 
         return await open_hci_socket_transport(spec)
 
     if scheme == 'usb':
-        from .usb import open_usb_transport
+        from bumble.transport.usb import open_usb_transport
 
         assert spec
         return await open_usb_transport(spec)
 
     if scheme == 'pyusb':
-        from .pyusb import open_pyusb_transport
+        from bumble.transport.pyusb import open_pyusb_transport
 
         assert spec
         return await open_pyusb_transport(spec)
 
     if scheme == 'android-emulator':
-        from .android_emulator import open_android_emulator_transport
+        from bumble.transport.android_emulator import open_android_emulator_transport
 
         return await open_android_emulator_transport(spec)
 
     if scheme == 'android-netsim':
-        from .android_netsim import open_android_netsim_transport
+        from bumble.transport.android_netsim import open_android_netsim_transport
 
         return await open_android_netsim_transport(spec)
 
     if scheme == 'unix':
-        from .unix import open_unix_client_transport
+        from bumble.transport.unix import open_unix_client_transport
 
         assert spec
         return await open_unix_client_transport(spec)
@@ -204,8 +209,8 @@ async def open_transport_or_link(name: str) -> Transport:
     """
     if name.startswith('link-relay:'):
         logger.warning('Link Relay has been deprecated.')
-        from ..controller import Controller
+        from bumble.controller import Controller
-        from ..link import RemoteLink  # lazy import
+        from bumble.link import RemoteLink  # lazy import
 
         link = RemoteLink(name[11:])
         await link.wait_until_connected()

bumble/transport/android_emulator.py

@@ -20,7 +20,7 @@ import grpc.aio
 
 from typing import Optional, Union
 
-from .common import (
+from bumble.transport.common import (
     PumpedTransport,
     PumpedPacketSource,
     PumpedPacketSink,
@@ -29,9 +29,13 @@ from .common import (
 )
 
 # pylint: disable=no-name-in-module
-from .grpc_protobuf.emulated_bluetooth_pb2_grpc import EmulatedBluetoothServiceStub
+from bumble.transport.grpc_protobuf.emulated_bluetooth_pb2_grpc import (
-from .grpc_protobuf.emulated_bluetooth_packets_pb2 import HCIPacket
+    EmulatedBluetoothServiceStub,
-from .grpc_protobuf.emulated_bluetooth_vhci_pb2_grpc import VhciForwardingServiceStub
+)
+from bumble.transport.grpc_protobuf.emulated_bluetooth_packets_pb2 import HCIPacket
+from bumble.transport.grpc_protobuf.emulated_bluetooth_vhci_pb2_grpc import (
+    VhciForwardingServiceStub,
+)
 
 
 # -----------------------------------------------------------------------------

bumble/transport/android_netsim.py

@@ -38,15 +38,18 @@ from bumble.transport.common import (
 )
 
 # pylint: disable=no-name-in-module
-from .grpc_protobuf.netsim.packet_streamer_pb2_grpc import (
+from bumble.transport.grpc_protobuf.netsim.packet_streamer_pb2_grpc import (
     PacketStreamerStub,
     PacketStreamerServicer,
     add_PacketStreamerServicer_to_server,
 )
-from .grpc_protobuf.netsim.packet_streamer_pb2 import PacketRequest, PacketResponse
+from bumble.transport.grpc_protobuf.netsim.packet_streamer_pb2 import (
-from .grpc_protobuf.netsim.hci_packet_pb2 import HCIPacket
+    PacketRequest,
-from .grpc_protobuf.netsim.startup_pb2 import Chip, ChipInfo, DeviceInfo
+    PacketResponse,
-from .grpc_protobuf.netsim.common_pb2 import ChipKind
+)
+from bumble.transport.grpc_protobuf.netsim.hci_packet_pb2 import HCIPacket
+from bumble.transport.grpc_protobuf.netsim.startup_pb2 import Chip, ChipInfo, DeviceInfo
+from bumble.transport.grpc_protobuf.netsim.common_pb2 import ChipKind
 
 
 # -----------------------------------------------------------------------------

bumble/transport/common.py

@@ -139,6 +139,7 @@ class PacketParser:
                         packet_type
                     ) or self.extended_packet_info.get(packet_type)
                     if self.packet_info is None:
+                        self.reset()
                         raise core.InvalidPacketError(
                             f'invalid packet type {packet_type}'
                         )
@@ -302,7 +303,10 @@ class ParserSource(BaseSource):
 # -----------------------------------------------------------------------------
 class StreamPacketSource(asyncio.Protocol, ParserSource):
     def data_received(self, data: bytes) -> None:
-        self.parser.feed_data(data)
+        try:
+            self.parser.feed_data(data)
+        except core.InvalidPacketError:
+            logger.warning("invalid packet, ignoring data")
 
 
 # -----------------------------------------------------------------------------

bumble/transport/file.py

@@ -19,7 +19,7 @@ import asyncio
 import io
 import logging
 
-from .common import Transport, StreamPacketSource, StreamPacketSink
+from bumble.transport.common import Transport, StreamPacketSource, StreamPacketSink
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/hci_socket.py

@@ -25,7 +25,7 @@ import collections
 
 from typing import Optional
 
-from .common import Transport, ParserSource
+from bumble.transport.common import Transport, ParserSource
 
 
 # -----------------------------------------------------------------------------

bumble/transport/pty.py

@@ -25,7 +25,7 @@ import logging
 
 from typing import Optional
 
-from .common import Transport, StreamPacketSource, StreamPacketSink
+from bumble.transport.common import Transport, StreamPacketSource, StreamPacketSink
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/pyusb.py

@@ -29,9 +29,9 @@ from usb.core import USBError
 from usb.util import CTRL_TYPE_CLASS, CTRL_RECIPIENT_OTHER
 from usb.legacy import REQ_SET_FEATURE, REQ_CLEAR_FEATURE, CLASS_HUB
 
-from .common import Transport, ParserSource, TransportInitError
+from bumble.transport.common import Transport, ParserSource, TransportInitError
-from .. import hci
+from bumble import hci
-from ..colors import color
+from bumble.colors import color
 
 
 # -----------------------------------------------------------------------------

bumble/transport/serial.py

@@ -19,7 +19,7 @@ import asyncio
 import logging
 import serial_asyncio
 
-from .common import Transport, StreamPacketSource, StreamPacketSink
+from bumble.transport.common import Transport, StreamPacketSource, StreamPacketSink
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/tcp_client.py

@@ -18,7 +18,7 @@
 import asyncio
 import logging
 
-from .common import Transport, StreamPacketSource, StreamPacketSink
+from bumble.transport.common import Transport, StreamPacketSource, StreamPacketSink
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/tcp_server.py

@@ -20,7 +20,7 @@ import asyncio
 import logging
 import socket
 
-from .common import Transport, StreamPacketSource
+from bumble.transport.common import Transport, StreamPacketSource
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/udp.py

@@ -18,7 +18,7 @@
 import asyncio
 import logging
 
-from .common import Transport, ParserSource
+from bumble.transport.common import Transport, ParserSource
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/unix.py

@@ -18,7 +18,7 @@
 import asyncio
 import logging
 
-from .common import Transport, StreamPacketSource, StreamPacketSink
+from bumble.transport.common import Transport, StreamPacketSource, StreamPacketSink
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/usb.py

@@ -115,9 +115,7 @@ async def open_usb_transport(spec: str) -> Transport:
             self.acl_out = acl_out
             self.acl_out_transfer = device.getTransfer()
             self.acl_out_transfer_ready = asyncio.Semaphore(1)
-            self.packets: asyncio.Queue[bytes] = (
+            self.packets = asyncio.Queue[bytes]()  # Queue of packets waiting to be sent
-                asyncio.Queue()
-            )  # Queue of packets waiting to be sent
             self.loop = asyncio.get_running_loop()
             self.queue_task = None
             self.cancel_done = self.loop.create_future()

bumble/transport/vhci.py

@@ -19,8 +19,8 @@ import logging
 
 from typing import Optional
 
-from .common import Transport
+from bumble.transport.common import Transport
-from .file import open_file_transport
+from bumble.transport.file import open_file_transport
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/ws_client.py

@@ -18,7 +18,12 @@
 import logging
 import websockets.client
 
-from .common import PumpedPacketSource, PumpedPacketSink, PumpedTransport, Transport
+from bumble.transport.common import (
+    PumpedPacketSource,
+    PumpedPacketSink,
+    PumpedTransport,
+    Transport,
+)
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/transport/ws_server.py

@@ -18,7 +18,7 @@
 import logging
 import websockets
 
-from .common import Transport, ParserSource, PumpedPacketSink
+from bumble.transport.common import Transport, ParserSource, PumpedPacketSink
 
 # -----------------------------------------------------------------------------
 # Logging

bumble/utils.py

@@ -38,9 +38,10 @@ from typing import (
 )
 from typing_extensions import Self
 
-from pyee import EventEmitter
+import pyee
+import pyee.asyncio
 
-from .colors import color
+from bumble.colors import color
 
 # -----------------------------------------------------------------------------
 # Logging
@@ -56,6 +57,48 @@ def setup_event_forwarding(emitter, forwarder, event_name):
     emitter.on(event_name, emit)
 
 
+# -----------------------------------------------------------------------------
+def wrap_async(function):
+    """
+    Wraps the provided function in an async function.
+    """
+    return functools.partial(async_call, function)
+
+
+# -----------------------------------------------------------------------------
+def deprecated(msg: str):
+    """
+    Throw deprecation warning before execution.
+    """
+
+    def wrapper(function):
+        @functools.wraps(function)
+        def inner(*args, **kwargs):
+            warnings.warn(msg, DeprecationWarning, stacklevel=2)
+            return function(*args, **kwargs)
+
+        return inner
+
+    return wrapper
+
+
+# -----------------------------------------------------------------------------
+def experimental(msg: str):
+    """
+    Throws a future warning before execution.
+    """
+
+    def wrapper(function):
+        @functools.wraps(function)
+        def inner(*args, **kwargs):
+            warnings.warn(msg, FutureWarning, stacklevel=2)
+            return function(*args, **kwargs)
+
+        return inner
+
+    return wrapper
+
+
 # -----------------------------------------------------------------------------
 def composite_listener(cls):
     """
@@ -113,21 +156,23 @@ class EventWatcher:
     ```
     '''
 
-    handlers: List[Tuple[EventEmitter, str, Callable[..., Any]]]
+    handlers: List[Tuple[pyee.EventEmitter, str, Callable[..., Any]]]
 
     def __init__(self) -> None:
         self.handlers = []
 
     @overload
     def on(
-        self, emitter: EventEmitter, event: str
+        self, emitter: pyee.EventEmitter, event: str
     ) -> Callable[[_Handler], _Handler]: ...
 
     @overload
-    def on(self, emitter: EventEmitter, event: str, handler: _Handler) -> _Handler: ...
+    def on(
+        self, emitter: pyee.EventEmitter, event: str, handler: _Handler
+    ) -> _Handler: ...
 
     def on(
-        self, emitter: EventEmitter, event: str, handler: Optional[_Handler] = None
+        self, emitter: pyee.EventEmitter, event: str, handler: Optional[_Handler] = None
     ) -> Union[_Handler, Callable[[_Handler], _Handler]]:
         '''Watch an event until the context is closed.
 
@@ -147,16 +192,16 @@ class EventWatcher:
 
     @overload
     def once(
-        self, emitter: EventEmitter, event: str
+        self, emitter: pyee.EventEmitter, event: str
     ) -> Callable[[_Handler], _Handler]: ...
 
     @overload
     def once(
-        self, emitter: EventEmitter, event: str, handler: _Handler
+        self, emitter: pyee.EventEmitter, event: str, handler: _Handler
     ) -> _Handler: ...
 
     def once(
-        self, emitter: EventEmitter, event: str, handler: Optional[_Handler] = None
+        self, emitter: pyee.EventEmitter, event: str, handler: Optional[_Handler] = None
     ) -> Union[_Handler, Callable[[_Handler], _Handler]]:
         '''Watch an event for once.
 
@@ -184,38 +229,48 @@ class EventWatcher:
 _T = TypeVar('_T')
 
 
-class AbortableEventEmitter(EventEmitter):
+def cancel_on_event(
-    def abort_on(self, event: str, awaitable: Awaitable[_T]) -> Awaitable[_T]:
+    emitter: pyee.EventEmitter, event: str, awaitable: Awaitable[_T]
-        """
+) -> Awaitable[_T]:
-        Set a coroutine or future to abort when an event occur.
+    """Set a coroutine or future to cancel when an event occur."""
-        """
+    future = asyncio.ensure_future(awaitable)
-        future = asyncio.ensure_future(awaitable)
+    if future.done():
-        if future.done():
-            return future
-
-        def on_event(*_):
-            if future.done():
-                return
-            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
 
+    def on_event(*args, **kwargs) -> None:
+        del args, kwargs
+        if future.done():
+            return
+        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(_):
+        emitter.remove_listener(event, on_event)
+
+    emitter.on(event, on_event)
+    future.add_done_callback(on_done)
+    return future
+
 
 # -----------------------------------------------------------------------------
-class CompositeEventEmitter(AbortableEventEmitter):
+class EventEmitter(pyee.asyncio.AsyncIOEventEmitter):
+    """A Base EventEmitter for Bumble."""
+
+    @deprecated("Use `cancel_on_event` instead.")
+    def abort_on(self, event: str, awaitable: Awaitable[_T]) -> Awaitable[_T]:
+        """Set a coroutine or future to abort when an event occur."""
+        return cancel_on_event(self, event, awaitable)
+
+
+# -----------------------------------------------------------------------------
+class CompositeEventEmitter(EventEmitter):
     def __init__(self):
         super().__init__()
         self._listener = None
@@ -430,48 +485,6 @@ async def async_call(function, *args, **kwargs):
     return function(*args, **kwargs)
 
 
-# -----------------------------------------------------------------------------
-def wrap_async(function):
-    """
-    Wraps the provided function in an async function.
-    """
-    return functools.partial(async_call, function)
-
-
-# -----------------------------------------------------------------------------
-def deprecated(msg: str):
-    """
-    Throw deprecation warning before execution.
-    """
-
-    def wrapper(function):
-        @functools.wraps(function)
-        def inner(*args, **kwargs):
-            warnings.warn(msg, DeprecationWarning)
-            return function(*args, **kwargs)
-
-        return inner
-
-    return wrapper
-
-
-# -----------------------------------------------------------------------------
-def experimental(msg: str):
-    """
-    Throws a future warning before execution.
-    """
-
-    def wrapper(function):
-        @functools.wraps(function)
-        def inner(*args, **kwargs):
-            warnings.warn(msg, FutureWarning)
-            return function(*args, **kwargs)
-
-        return inner
-
-    return wrapper
-
-
 # -----------------------------------------------------------------------------
 class OpenIntEnum(enum.IntEnum):
     """
@@ -502,3 +515,13 @@ class ByteSerializable(Protocol):
     def from_bytes(cls, data: bytes) -> Self: ...
 
     def __bytes__(self) -> bytes: ...
+
+
+# -----------------------------------------------------------------------------
+class IntConvertible(Protocol):
+    """
+    Type protocol for classes that can be instantiated from int and converted to int.
+    """
+
+    def __init__(self, value: int) -> None: ...
+    def __int__(self) -> int: ...

docs/mkdocs/src/apps_and_tools/auracast.md

@@ -0,0 +1,202 @@
+AURACAST TOOL
+=============
+
+The "auracast" tool implements commands that implement broadcasting, receiving
+and controlling LE Audio broadcasts.
+
+=== "Running as an installed package"
+    ```
+    $ bumble-auracast
+    ```
+
+=== "Running from source"
+    ```
+    $ python3 apps/auracast.py <args>
+    ```
+
+# Python Dependencies
+Try installing the optional `[auracast]` dependencies:
+
+=== "From source"
+    ```bash
+    $ python3 -m pip install ".[auracast]"
+    ```
+
+=== "From PyPI"
+    ```bash
+    $ python3 -m pip install "bumble[auracast]"
+    ```
+
+## LC3
+The `auracast` app depends on the `lc3` python module, which is available
+either as PyPI module (currently only available for Linux x86_64).
+When installing Bumble with the optional `auracast` dependency, the `lc3`
+module will be installed from the `lc3py` PyPI package if available.
+If not, you will need to install it separately. This can be done with:
+```bash
+$ python3 -m pip install "git+https://github.com/google/liblc3.git"
+```
+
+## SoundDevice
+The `sounddevice` module is required for audio output to the host's sound
+output device(s) and/or input from the host's input device(s).
+If not installed, the `auracast` app is still functional, but will be limited
+to non-device inputs and output (files, external processes, ...)
+
+On macOS and Windows, the `sounddevice` module gets installed with the
+native PortAudio libraries included.
+
+For Linux, however, PortAudio must be installed separately.
+This is typically done with a command like:
+```bash
+$ sudo apt install libportaudio2
+```
+
+Visit the [sounddevice documentation](https://python-sounddevice.readthedocs.io/)
+for details.
+
+
+# General Usage
+```
+Usage: bumble-auracast [OPTIONS] COMMAND [ARGS]...
+
+Options:
+  --help  Show this message and exit.
+
+Commands:
+  assist    Scan for broadcasts on behalf of an audio server
+  pair      Pair with an audio server
+  receive   Receive a broadcast source
+  scan      Scan for public broadcasts
+  transmit  Transmit a broadcast source
+```
+
+Use `bumble-auracast <command> --help` to get more detailed usage information
+for a specific `<command>`.
+
+## `assist`
+Act as a broadcast assistant.
+
+Use `bumble-auracast assist --help` for details on the commands and options.
+
+The assistant commands are:
+
+### `monitor-state`
+Subscribe to the state characteristic and monitor changes.
+
+### `add-source`
+Add a broadcast source. This will instruct the device to start
+receiving a broadcast.
+
+### `modify-source`
+Modify a broadcast source.
+
+### `remove-source`
+Remote a broadcast source.
+
+## `pair`
+Pair with a device.
+
+## `receive`
+Receive a broadcast source.
+
+The `--output` option specifies where to send the decoded audio samples.
+The following outputs are supported:
+
+### Sound Device
+The `--output` argument is either `device`, to send the audio to the hosts's default sound device, or `device:<DEVICE_ID>` where `<DEVICE_ID>`
+is the integer ID of one of the available sound devices.
+When invoked with `--output "device:?"`, a list of available devices and
+their IDs is printed out.
+
+### Standard Output
+With `--output stdout`, the decoded audio samples are written to the
+standard output (currently always as float32 PCM samples)
+
+### FFPlay
+With `--output ffplay`, the decoded audio samples are piped to `ffplay`
+in a child process. This option is only available if `ffplay` is a command that is available on the host.
+
+### File
+With `--output <filename>` or `--output file:<filename>`, the decoded audio
+samples are written to a file (currently always as float32 PCM)
+
+## `transmit`
+Broadcast an audio source as a transmitter.
+
+The `--input` and `--input-format` options specify what audio input
+source to transmit.
+The following inputs are supported:
+
+### Sound Device
+The `--input` argument is either `device`, to use the host's default sound
+device (typically a builtin microphone), or `device:<DEVICE_ID>` where
+`<DEVICE_ID>` is the integer ID of one of the available sound devices.
+When invoked with `--input "device:?"`, a list of available devices and their
+IDs is printed out.
+
+### Standard Input
+With `--input stdout`, the audio samples are read from the standard input.
+(currently always as int16 PCM).
+
+### File
+With `--input <filename>` or `--input file:<filename>`, the audio samples
+are read from a .wav or raw PCM file.
+
+Use the `--input-format <FORMAT>` option to specify the format of the audio
+samples in raw PCM files. `<FORMAT>` is expressed as:
+`<sample-type>,<sample-rate>,<channels>`
+(the only supported <sample-type> currently is 'int16le' for 16 bit signed integers with little-endian byte order)
+
+## `scan`
+Scan for public broadcasts.
+
+A live display of the available broadcasts is displayed continuously.
+
+# Compatibility With Some Products
+The `auracast` app has been tested for compatibility with a few products.
+The list is still very limited. Please let us know if there are products
+that are not working well, or if there are specific instructions that should
+be shared to allow better compatibiity with certain products.
+
+## Transmitters
+
+The `receive` command has been tested to successfully receive broadcasts from
+the following transmitters:
+
+  * JBL GO 4
+  * Flairmesh FlooGoo FMA120
+  * Eppfun AK3040Pro Max
+  * HIGHGAZE BA-25T
+  * Nexum Audio VOCE and USB dongle
+
+## Receivers
+
+### Pixel Buds Pro 2
+
+The Pixel Buds Pro 2 can be used as a broadcast receiver, controlled by the
+`auracast assist` command, instructing the buds to receive a broadcast.
+
+Use the `assist --command add-source` command to tell the buds to receive a
+broadcast.
+
+Use the `assist --command monitor-state` command to monitor the current sync/receive
+state of the buds.
+
+### JBL
+The JBL GO 4 and other JBL products that support the Auracast feature can be used
+as transmitters or receivers.
+
+When running in receiver mode (pressing the Auracast button while not already playing),
+the JBL speaker will scan for broadcast advertisements with a specific manufacturer data.
+Use the `--manufacturer-data` option of the `transmit` command in order to include data
+that will let the speaker recognize the broadcast as a compatible source.
+
+The manufacturer ID for JBL is 87.
+Using an option like `--manufacturer-data 87:00000000000000000000000000000000dffd` should work (tested on the
+JBL GO 4. The `dffd` value at the end of the payload may be different on other models?).
+
+
+### Others
+
+  * Nexum Audio VOCE and USB dongle

examples/cs_initiator.json

@@ -0,0 +1,9 @@
+{
+    "name": "Bumble CS Initiator",
+    "address": "F0:F1:F2:F3:F4:F5",
+    "advertising_interval": 100,
+    "keystore": "JsonKeyStore",
+    "irk": "865F81FF5A8B486EAAE29A27AD9F77DC",
+    "identity_address_type": 1,
+    "channel_sounding_enabled": true
+}

examples/cs_reflector.json

@@ -0,0 +1,9 @@
+{
+    "name": "Bumble CS Reflector",
+    "address": "F0:F1:F2:F3:F4:F6",
+    "advertising_interval": 100,
+    "keystore": "JsonKeyStore",
+    "irk": "0c7d74db03a1c98e7be691f76141d53d",
+    "identity_address_type": 1,
+    "channel_sounding_enabled": true
+}

examples/heart_rate_server.py

@@ -102,7 +102,6 @@ async def main() -> None:
         )
 
         # Notify subscribers of the current value as soon as they subscribe
-        @heart_rate_service.heart_rate_measurement_characteristic.on('subscription')
         def on_subscription(connection, notify_enabled, indicate_enabled):
             if notify_enabled or indicate_enabled:
                 AsyncRunner.spawn(
@@ -112,6 +111,10 @@ async def main() -> None:
                     )
                 )
 
+        heart_rate_service.heart_rate_measurement_characteristic.on(
+            'subscription', on_subscription
+        )
+
         # Go!
         await device.power_on()
         await device.start_advertising(auto_restart=True)

examples/mobly/bench/one_device_bench_test.py

@@ -28,7 +28,7 @@ class OneDeviceBenchTest(base_test.BaseTestClass):
 
     def test_l2cap_client_ping(self):
         runner = self.dut.bench.runL2capClient(
-            "ping", "4B:2A:67:76:2B:E3", 128, True, 100, 970, 100
+            "ping", "4B:2A:67:76:2B:E3", 128, True, 100, 970, 100, "HIGH"
         )
         print("### Initial status:", runner)
         final_status = self.dut.bench.waitForRunnerCompletion(runner["id"])
@@ -36,12 +36,34 @@ class OneDeviceBenchTest(base_test.BaseTestClass):
 
     def test_l2cap_client_send(self):
         runner = self.dut.bench.runL2capClient(
-            "send", "7E:90:D0:F2:7A:11", 131, True, 100, 970, 0
+            "send",
+            "F1:F1:F1:F1:F1:F1",
+            128,
+            True,
+            100,
+            970,
+            0,
+            "HIGH",
+            10000,
         )
         print("### Initial status:", runner)
         final_status = self.dut.bench.waitForRunnerCompletion(runner["id"])
         print("### Final status:", final_status)
 
+    def test_gatt_client_send(self):
+        runner = self.dut.bench.runGattClient(
+            "send", "F1:F1:F1:F1:F1:F1", 128, True, 100, 970, 100, "HIGH"
+        )
+        print("### Initial status:", runner)
+        final_status = self.dut.bench.waitForRunnerCompletion(runner["id"])
+        print("### Final status:", final_status)
+
+    def test_gatt_server_receive(self):
+        runner = self.dut.bench.runGattServer("receive")
+        print("### Initial status:", runner)
+        final_status = self.dut.bench.waitForRunnerCompletion(runner["id"])
+        print("### Final status:", final_status)
+
 
 if __name__ == "__main__":
     test_runner.main()

examples/mobly/bench/sample_config.yml

@@ -2,8 +2,8 @@ TestBeds:
   - Name: BenchTestBed
     Controllers:
         AndroidDevice:
-          - serial: 37211FDJG000DJ
+          - serial: emulator-5554
             local_bt_address: 94:45:60:5E:03:B0
 
-          - serial: 23071FDEE001F7
+          #- serial: 23071FDEE001F7
-            local_bt_address: DC:E5:5B:E5:51:2C
+          #  local_bt_address: DC:E5:5B:E5:51:2C

examples/run_a2dp_info.py

@@ -24,7 +24,7 @@ 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,
+    PhysicalTransport,
     BT_AVDTP_PROTOCOL_ID,
     BT_AUDIO_SINK_SERVICE,
     BT_L2CAP_PROTOCOL_ID,
@@ -165,7 +165,9 @@ async def main() -> None:
         # Connect to a peer
         target_address = sys.argv[3]
         print(f'=== Connecting to {target_address}...')
-        connection = await device.connect(target_address, transport=BT_BR_EDR_TRANSPORT)
+        connection = await device.connect(
+            target_address, transport=PhysicalTransport.BR_EDR
+        )
         print(f'=== Connected to {connection.peer_address}!')
 
         # Request authentication

examples/run_a2dp_sink.py

@@ -23,7 +23,7 @@ from typing import Any, Dict
 
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
-from bumble.core import BT_BR_EDR_TRANSPORT
+from bumble.core import PhysicalTransport
 from bumble.avdtp import (
     AVDTP_AUDIO_MEDIA_TYPE,
     Protocol,
@@ -33,12 +33,6 @@ from bumble.avdtp import (
 from bumble.a2dp import (
     make_audio_sink_service_sdp_records,
     A2DP_SBC_CODEC_TYPE,
-    SBC_MONO_CHANNEL_MODE,
-    SBC_DUAL_CHANNEL_MODE,
-    SBC_SNR_ALLOCATION_METHOD,
-    SBC_LOUDNESS_ALLOCATION_METHOD,
-    SBC_STEREO_CHANNEL_MODE,
-    SBC_JOINT_STEREO_CHANNEL_MODE,
     SbcMediaCodecInformation,
 )
 
@@ -145,7 +139,7 @@ async def main() -> None:
                 target_address = sys.argv[4]
                 print(f'=== Connecting to {target_address}...')
                 connection = await device.connect(
-                    target_address, transport=BT_BR_EDR_TRANSPORT
+                    target_address, transport=PhysicalTransport.BR_EDR
                 )
                 print(f'=== Connected to {connection.peer_address}!')
 

examples/run_a2dp_source.py

@@ -23,7 +23,7 @@ import logging
 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
+from bumble.core import PhysicalTransport
 from bumble.avdtp import (
     find_avdtp_service_with_connection,
     AVDTP_AUDIO_MEDIA_TYPE,
@@ -146,7 +146,7 @@ async def main() -> None:
                 target_address = sys.argv[4]
                 print(f'=== Connecting to {target_address}...')
                 connection = await device.connect(
-                    target_address, transport=BT_BR_EDR_TRANSPORT
+                    target_address, transport=PhysicalTransport.BR_EDR
                 )
                 print(f'=== Connected to {connection.peer_address}!')
 

examples/run_ancs_client.py

@@ -0,0 +1,215 @@
+# Copyright 2025 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, Peer
+from bumble.transport import open_transport
+from bumble.profiles.ancs import (
+    AncsClient,
+    AppAttribute,
+    AppAttributeId,
+    EventFlags,
+    EventId,
+    Notification,
+    NotificationAttributeId,
+)
+
+
+# -----------------------------------------------------------------------------
+_cached_app_names: dict[str, str] = {}
+_notification_queue = asyncio.Queue[Notification]()
+
+
+async def process_notifications(ancs_client: AncsClient):
+    while True:
+        notification = await _notification_queue.get()
+
+        prefix = " "
+        if notification.event_id == EventId.NOTIFICATION_ADDED:
+            print_color = "green"
+            if notification.event_flags & EventFlags.PRE_EXISTING:
+                prefix = " Existing "
+            else:
+                prefix = " New "
+        elif notification.event_id == EventId.NOTIFICATION_REMOVED:
+            print_color = "red"
+        elif notification.event_id == EventId.NOTIFICATION_MODIFIED:
+            print_color = "yellow"
+        else:
+            print_color = "white"
+
+        print(
+            color(
+                (
+                    f"[{notification.event_id.name}]{prefix}Notification "
+                    f"({notification.notification_uid}):"
+                ),
+                print_color,
+            )
+        )
+        print(color("  Event ID:      ", "yellow"), notification.event_id.name)
+        print(color("  Event Flags:   ", "yellow"), notification.event_flags.name)
+        print(color("  Category ID:   ", "yellow"), notification.category_id.name)
+        print(color("  Category Count:", "yellow"), notification.category_count)
+
+        if notification.event_id not in (
+            EventId.NOTIFICATION_ADDED,
+            EventId.NOTIFICATION_MODIFIED,
+        ):
+            continue
+
+        requested_attributes = [
+            NotificationAttributeId.APP_IDENTIFIER,
+            NotificationAttributeId.TITLE,
+            NotificationAttributeId.SUBTITLE,
+            NotificationAttributeId.MESSAGE,
+            NotificationAttributeId.DATE,
+        ]
+        if notification.event_flags & EventFlags.NEGATIVE_ACTION:
+            requested_attributes.append(NotificationAttributeId.NEGATIVE_ACTION_LABEL)
+        if notification.event_flags & EventFlags.POSITIVE_ACTION:
+            requested_attributes.append(NotificationAttributeId.POSITIVE_ACTION_LABEL)
+
+        attributes = await ancs_client.get_notification_attributes(
+            notification.notification_uid, requested_attributes
+        )
+        max_attribute_name_width = max(
+            (len(attribute.attribute_id.name) for attribute in attributes)
+        )
+        app_identifier = str(
+            next(
+                (
+                    attribute.value
+                    for attribute in attributes
+                    if attribute.attribute_id == NotificationAttributeId.APP_IDENTIFIER
+                )
+            )
+        )
+        if app_identifier not in _cached_app_names:
+            app_attributes = await ancs_client.get_app_attributes(
+                app_identifier, [AppAttributeId.DISPLAY_NAME]
+            )
+            _cached_app_names[app_identifier] = app_attributes[0].value
+        app_name = _cached_app_names[app_identifier]
+
+        for attribute in attributes:
+            padding = ' ' * (
+                max_attribute_name_width - len(attribute.attribute_id.name)
+            )
+            suffix = (
+                f" ({app_name})"
+                if attribute.attribute_id == NotificationAttributeId.APP_IDENTIFIER
+                else ""
+            )
+            print(
+                color(f"  {attribute.attribute_id.name}:{padding}", "blue"),
+                f"{attribute.value}{suffix}",
+            )
+
+        print()
+
+
+def on_ancs_notification(notification: Notification) -> None:
+    _notification_queue.put_nowait(notification)
+
+
+async def handle_command_client(
+    ancs_client: AncsClient, reader: asyncio.StreamReader, writer: asyncio.StreamWriter
+) -> None:
+    while True:
+        command = (await reader.readline()).decode("utf-8").strip()
+
+        try:
+            command_name, command_args = command.split(" ", 1)
+            if command_name == "+":
+                notification_uid = int(command_args)
+                await ancs_client.perform_positive_action(notification_uid)
+            elif command_name == "-":
+                notification_uid = int(command_args)
+                await ancs_client.perform_negative_action(notification_uid)
+            else:
+                writer.write(f"unknown command {command_name}".encode("utf-8"))
+        except Exception as error:
+            writer.write(f"ERROR: {error}\n".encode("utf-8"))
+
+
+# -----------------------------------------------------------------------------
+async def main() -> None:
+    if len(sys.argv) < 3:
+        print(
+            'Usage: run_ancs_client.py <device-config> <transport-spec> '
+            '<bluetooth-address> <mtu>'
+        )
+        print('example: run_ancs_client.py device1.json usb:0 E1:CA:72:48:C4:E8 512')
+        return
+    device_config, transport_spec, bluetooth_address, mtu = sys.argv[1:]
+
+    print('<<< connecting to HCI...')
+    async with await open_transport(transport_spec) as hci_transport:
+        print('<<< connected')
+
+        # Create a device to manage the host, with a custom listener
+        device = Device.from_config_file_with_hci(
+            device_config, hci_transport.source, hci_transport.sink
+        )
+        await device.power_on()
+
+        # Connect to the peer
+        print(f'=== Connecting to {bluetooth_address}...')
+        connection = await device.connect(bluetooth_address)
+        print(f'=== Connected: {connection}')
+
+        await connection.encrypt()
+
+        peer = Peer(connection)
+        mtu_int = int(mtu)
+        if mtu_int:
+            new_mtu = await peer.request_mtu(mtu_int)
+            print(f'ATT MTU = {new_mtu}')
+        ancs_client = await AncsClient.for_peer(peer)
+        if ancs_client is None:
+            print("!!! no ANCS service found")
+            return
+        await ancs_client.start()
+
+        print('Subscribing to updates')
+        ancs_client.on("notification", on_ancs_notification)
+
+        # Process all notifications in a task.
+        notification_processing_task = asyncio.create_task(
+            process_notifications(ancs_client)
+        )
+
+        # Accept a TCP connection to handle commands.
+        tcp_server = await asyncio.start_server(
+            lambda reader, writer: handle_command_client(ancs_client, reader, writer),
+            '127.0.0.1',
+            9000,
+        )
+        print("Accepting command client on port 9000")
+        async with tcp_server:
+            await tcp_server.serve_forever()
+
+
+# -----------------------------------------------------------------------------
+logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
+asyncio.run(main())

examples/run_avrcp.py

@@ -25,7 +25,7 @@ import websockets
 
 from bumble.device import Device
 from bumble.transport import open_transport_or_link
-from bumble.core import BT_BR_EDR_TRANSPORT
+from bumble.core import PhysicalTransport
 from bumble import avc
 from bumble import avrcp
 from bumble import avdtp
@@ -379,7 +379,7 @@ async def main() -> None:
             target_address = sys.argv[4]
             print(f'=== Connecting to {target_address}...')
             connection = await device.connect(
-                target_address, transport=BT_BR_EDR_TRANSPORT
+                target_address, transport=PhysicalTransport.BR_EDR
             )
             print(f'=== Connected to {connection.peer_address}!')
 

examples/run_channel_sounding.py

@@ -0,0 +1,154 @@
+# Copyright 2024 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 __future__ import annotations
+
+import asyncio
+import logging
+import sys
+import os
+import functools
+
+from bumble import core
+from bumble import hci
+from bumble.device import Connection, Device, ChannelSoundingCapabilities
+from bumble.transport import open_transport_or_link
+
+# From https://cs.android.com/android/platform/superproject/main/+/main:packages/modules/Bluetooth/system/gd/hci/distance_measurement_manager.cc.
+CS_TONE_ANTENNA_CONFIG_MAPPING_TABLE = [
+    [0, 4, 5, 6],
+    [1, 7, 7, 7],
+    [2, 7, 7, 7],
+    [3, 7, 7, 7],
+]
+CS_PREFERRED_PEER_ANTENNA_MAPPING_TABLE = [1, 1, 1, 1, 3, 7, 15, 3]
+CS_ANTENNA_PERMUTATION_ARRAY = [
+    [1, 2, 3, 4],
+    [2, 1, 3, 4],
+    [1, 3, 2, 4],
+    [3, 1, 2, 4],
+    [3, 2, 1, 4],
+    [2, 3, 1, 4],
+    [1, 2, 4, 3],
+    [2, 1, 4, 3],
+    [1, 4, 2, 3],
+    [4, 1, 2, 3],
+    [4, 2, 1, 3],
+    [2, 4, 1, 3],
+    [1, 4, 3, 2],
+    [4, 1, 3, 2],
+    [1, 3, 4, 2],
+    [3, 1, 4, 2],
+    [3, 4, 1, 2],
+    [4, 3, 1, 2],
+    [4, 2, 3, 1],
+    [2, 4, 3, 1],
+    [4, 3, 2, 1],
+    [3, 4, 2, 1],
+    [3, 2, 4, 1],
+    [2, 3, 4, 1],
+]
+
+
+# -----------------------------------------------------------------------------
+async def main() -> None:
+    if len(sys.argv) < 3:
+        print(
+            'Usage: run_channel_sounding.py <config-file> <transport-spec-for-device>'
+            '[target_address](If missing, run as reflector)'
+        )
+        print('example: run_channel_sounding.py cs_reflector.json usb:0')
+        print(
+            'example: run_channel_sounding.py cs_initiator.json usb:0 F0:F1:F2:F3:F4:F5'
+        )
+        return
+
+    print('<<< connecting to HCI...')
+    async with await open_transport_or_link(sys.argv[2]) as hci_transport:
+        print('<<< connected')
+
+        device = Device.from_config_file_with_hci(
+            sys.argv[1], hci_transport.source, hci_transport.sink
+        )
+        await device.power_on()
+        assert (local_cs_capabilities := device.cs_capabilities)
+
+        if len(sys.argv) == 3:
+            print('<<< Start Advertising')
+            await device.start_advertising(
+                own_address_type=hci.OwnAddressType.RANDOM, auto_restart=True
+            )
+
+            def on_cs_capabilities(
+                connection: Connection, capabilities: ChannelSoundingCapabilities
+            ):
+                del capabilities
+                print('<<< Set CS Settings')
+                asyncio.create_task(device.set_default_cs_settings(connection))
+
+            device.on(
+                'connection',
+                lambda connection: connection.on(
+                    'channel_sounding_capabilities',
+                    functools.partial(on_cs_capabilities, connection),
+                ),
+            )
+        else:
+            target_address = hci.Address(sys.argv[3])
+
+            print(f'<<< Connecting to {target_address}')
+            connection = await device.connect(
+                target_address, transport=core.PhysicalTransport.LE
+            )
+            print('<<< ACL Connected')
+            if not (await device.get_long_term_key(connection.handle, b'', 0)):
+                print('<<< No bond, start pairing')
+                await connection.pair()
+                print('<<< Pairing complete')
+
+            print('<<< Encrypting Connection')
+            await connection.encrypt()
+
+            print('<<< Getting remote CS Capabilities...')
+            remote_capabilities = await device.get_remote_cs_capabilities(connection)
+            print('<<< Set CS Settings...')
+            await device.set_default_cs_settings(connection)
+            print('<<< Set CS Config...')
+            config = await device.create_cs_config(connection)
+            print('<<< Enable CS Security...')
+            await device.enable_cs_security(connection)
+            tone_antenna_config_selection = CS_TONE_ANTENNA_CONFIG_MAPPING_TABLE[
+                local_cs_capabilities.num_antennas_supported - 1
+            ][remote_capabilities.num_antennas_supported - 1]
+            print('<<< Set CS Procedure Parameters...')
+            await device.set_cs_procedure_parameters(
+                connection=connection,
+                config=config,
+                tone_antenna_config_selection=tone_antenna_config_selection,
+                preferred_peer_antenna=CS_PREFERRED_PEER_ANTENNA_MAPPING_TABLE[
+                    tone_antenna_config_selection
+                ],
+            )
+            print('<<< Enable CS Procedure...')
+            await device.enable_cs_procedure(connection=connection, config=config)
+
+        await hci_transport.source.terminated
+
+
+# -----------------------------------------------------------------------------
+logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
+asyncio.run(main())

examples/run_cig_setup.py

@@ -19,12 +19,8 @@ import asyncio
 import logging
 import sys
 import os
-from bumble.device import (
+from bumble import utils
-    Device,
+from bumble.device import Device, Connection
-    Connection,
-    AdvertisingParameters,
-    AdvertisingEventProperties,
-)
 from bumble.hci import (
     OwnAddressType,
 )
@@ -79,7 +75,9 @@ async def main() -> None:
     def on_cis_request(
         connection: Connection, cis_handle: int, _cig_id: int, _cis_id: int
     ):
-        connection.abort_on('disconnection', devices[0].accept_cis_request(cis_handle))
+        utils.cancel_on_event(
+            connection, 'disconnection', devices[0].accept_cis_request(cis_handle)
+        )
 
     devices[0].on('cis_request', on_cis_request)
 

examples/run_classic_connect.py

@@ -23,7 +23,7 @@ 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, BT_L2CAP_PROTOCOL_ID, CommandTimeoutError
+from bumble.core import PhysicalTransport, BT_L2CAP_PROTOCOL_ID, CommandTimeoutError
 from bumble.sdp import (
     Client as SDP_Client,
     SDP_PUBLIC_BROWSE_ROOT,
@@ -57,7 +57,7 @@ async def main() -> None:
             print(f'=== Connecting to {target_address}...')
             try:
                 connection = await device.connect(
-                    target_address, transport=BT_BR_EDR_TRANSPORT
+                    target_address, transport=PhysicalTransport.BR_EDR
                 )
             except CommandTimeoutError:
                 print('!!! Connection timed out')

examples/run_esco_connection.py

@@ -16,11 +16,10 @@
 # Imports
 # -----------------------------------------------------------------------------
 import asyncio
-import dataclasses
 import logging
 import sys
 import os
-from bumble.core import BT_BR_EDR_TRANSPORT
+from bumble.core import PhysicalTransport
 from bumble.device import Device, ScoLink
 from bumble.hci import HCI_Enhanced_Setup_Synchronous_Connection_Command
 from bumble.hfp import DefaultCodecParameters, ESCO_PARAMETERS
@@ -61,7 +60,9 @@ async def main() -> None:
 
     connections = await asyncio.gather(
         devices[0].accept(devices[1].public_address),
-        devices[1].connect(devices[0].public_address, transport=BT_BR_EDR_TRANSPORT),
+        devices[1].connect(
+            devices[0].public_address, transport=PhysicalTransport.BR_EDR
+        ),
     )
 
     def on_sco(sco_link: ScoLink):

examples/run_gatt_client_and_server.py

@@ -70,13 +70,13 @@ async def main() -> None:
     descriptor = Descriptor(
         GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
         Descriptor.READABLE,
-        'My Description',
+        'My Description'.encode(),
     )
-    manufacturer_name_characteristic = Characteristic(
+    manufacturer_name_characteristic = Characteristic[bytes](
         GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
         Characteristic.Properties.READ,
         Characteristic.READABLE,
-        "Fitbit",
+        "Fitbit".encode(),
         [descriptor],
     )
     device_info_service = Service(

examples/run_gatt_server.py

@@ -94,13 +94,13 @@ async def main() -> None:
         descriptor = Descriptor(
             GATT_CHARACTERISTIC_USER_DESCRIPTION_DESCRIPTOR,
             Descriptor.READABLE,
-            'My Description',
+            'My Description'.encode(),
         )
         manufacturer_name_characteristic = Characteristic(
             GATT_MANUFACTURER_NAME_STRING_CHARACTERISTIC,
             Characteristic.Properties.READ,
             Characteristic.READABLE,
-            'Fitbit',
+            'Fitbit'.encode(),
             [descriptor],
         )
         device_info_service = Service(

examples/run_gatt_with_adapters.py

@@ -1,4 +1,4 @@
-# Copyright 2024 Google LLC
+# Copyright 2025 Google LLC
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -18,6 +18,8 @@
 from __future__ import annotations
 import asyncio
 import dataclasses
+import functools
+import enum
 import logging
 import os
 import random
@@ -28,6 +30,8 @@ from typing import Any, List, Union
 from bumble.device import Device, Peer
 from bumble import transport
 from bumble import gatt
+from bumble import gatt_adapters
+from bumble import gatt_client
 from bumble import hci
 from bumble import core
 
@@ -36,6 +40,9 @@ from bumble import core
 SERVICE_UUID = core.UUID("50DB505C-8AC4-4738-8448-3B1D9CC09CC5")
 CHARACTERISTIC_UUID_BASE = "D901B45B-4916-412E-ACCA-0000000000"
 
+DEFAULT_CLIENT_ADDRESS = "F0:F1:F2:F3:F4:F5"
+DEFAULT_SERVER_ADDRESS = "F1:F2:F3:F4:F5:F6"
+
 
 # -----------------------------------------------------------------------------
 @dataclasses.dataclass
@@ -65,6 +72,12 @@ class CustomClass:
         return struct.pack(">II", self.a, self.b)
 
 
+# -----------------------------------------------------------------------------
+class CustomEnum(enum.IntEnum):
+    FOO = 1234
+    BAR = 5678
+
+
 # -----------------------------------------------------------------------------
 async def client(device: Device, address: hci.Address) -> None:
     print(f'=== Connecting to {address}...')
@@ -78,8 +91,8 @@ async def client(device: Device, address: hci.Address) -> None:
     print("*** Discovery complete")
 
     service = peer.get_services_by_uuid(SERVICE_UUID)[0]
-    characteristics = []
+    characteristics: list[gatt_client.CharacteristicProxy] = []
-    for index in range(1, 9):
+    for index in range(1, 10):
         characteristics.append(
             service.get_characteristics_by_uuid(
                 core.UUID(CHARACTERISTIC_UUID_BASE + f"{index:02X}")
@@ -91,59 +104,92 @@ async def client(device: Device, address: hci.Address) -> None:
         value = await characteristic.read_value()
         print(f"### {characteristic} = {value!r} ({value.hex()})")
 
+    # Subscribe to all characteristics as a raw bytes listener.
+    def on_raw_characteristic_update(characteristic, value):
+        print(f"^^^ Update[RAW] {characteristic.uuid} value = {value.hex()}")
+
+    for characteristic in characteristics:
+        await characteristic.subscribe(
+            functools.partial(on_raw_characteristic_update, characteristic)
+        )
+
+    # Function to subscribe to adapted characteristics
+    def on_adapted_characteristic_update(characteristic, value):
+        print(
+            f"^^^ Update[ADAPTED] {characteristic.uuid} value = {value!r}, "
+            f"type={type(value)}"
+        )
+
     # Static characteristic with a bytes value.
     c1 = characteristics[0]
     c1_value = await c1.read_value()
     print(f"@@@ C1 {c1} value = {c1_value!r} (type={type(c1_value)})")
     await c1.write_value("happy π day".encode("utf-8"))
+    await c1.subscribe(functools.partial(on_adapted_characteristic_update, c1))
 
     # Static characteristic with a string value.
-    c2 = gatt.UTF8CharacteristicAdapter(characteristics[1])
+    c2 = gatt_adapters.UTF8CharacteristicProxyAdapter(characteristics[1])
     c2_value = await c2.read_value()
     print(f"@@@ C2 {c2} value = {c2_value} (type={type(c2_value)})")
     await c2.write_value("happy π day")
+    await c2.subscribe(functools.partial(on_adapted_characteristic_update, c2))
 
     # Static characteristic with a tuple value.
-    c3 = gatt.PackedCharacteristicAdapter(characteristics[2], ">III")
+    c3 = gatt_adapters.PackedCharacteristicProxyAdapter(characteristics[2], ">III")
     c3_value = await c3.read_value()
     print(f"@@@ C3 {c3} value = {c3_value} (type={type(c3_value)})")
     await c3.write_value((2001, 2002, 2003))
+    await c3.subscribe(functools.partial(on_adapted_characteristic_update, c3))
 
     # Static characteristic with a named tuple value.
-    c4 = gatt.MappedCharacteristicAdapter(
+    c4 = gatt_adapters.MappedCharacteristicProxyAdapter(
         characteristics[3], ">III", ["f1", "f2", "f3"]
     )
     c4_value = await c4.read_value()
     print(f"@@@ C4 {c4} value = {c4_value} (type={type(c4_value)})")
     await c4.write_value({"f1": 4001, "f2": 4002, "f3": 4003})
+    await c4.subscribe(functools.partial(on_adapted_characteristic_update, c4))
 
     # Static characteristic with a serializable value.
-    c5 = gatt.SerializableCharacteristicAdapter(
+    c5 = gatt_adapters.SerializableCharacteristicProxyAdapter(
         characteristics[4], CustomSerializableClass
     )
     c5_value = await c5.read_value()
     print(f"@@@ C5 {c5} value = {c5_value} (type={type(c5_value)})")
     await c5.write_value(CustomSerializableClass(56, 57))
+    await c5.subscribe(functools.partial(on_adapted_characteristic_update, c5))
 
     # Static characteristic with a delegated value.
-    c6 = gatt.DelegatedCharacteristicAdapter(
+    c6 = gatt_adapters.DelegatedCharacteristicProxyAdapter(
         characteristics[5], encode=CustomClass.encode, decode=CustomClass.decode
     )
     c6_value = await c6.read_value()
     print(f"@@@ C6 {c6} value = {c6_value} (type={type(c6_value)})")
     await c6.write_value(CustomClass(6, 7))
+    await c6.subscribe(functools.partial(on_adapted_characteristic_update, c6))
 
     # Dynamic characteristic with a bytes value.
     c7 = characteristics[6]
     c7_value = await c7.read_value()
     print(f"@@@ C7 {c7} value = {c7_value!r} (type={type(c7_value)})")
     await c7.write_value(bytes.fromhex("01020304"))
+    await c7.subscribe(functools.partial(on_adapted_characteristic_update, c7))
 
     # Dynamic characteristic with a string value.
-    c8 = gatt.UTF8CharacteristicAdapter(characteristics[7])
+    c8 = gatt_adapters.UTF8CharacteristicProxyAdapter(characteristics[7])
     c8_value = await c8.read_value()
     print(f"@@@ C8 {c8} value = {c8_value} (type={type(c8_value)})")
     await c8.write_value("howdy")
+    await c8.subscribe(functools.partial(on_adapted_characteristic_update, c8))
+
+    # Static characteristic with an enum value
+    c9 = gatt_adapters.EnumCharacteristicProxyAdapter(
+        characteristics[8], CustomEnum, 3, 'big'
+    )
+    c9_value = await c9.read_value()
+    print(f"@@@ C9 {c9} value = {c9_value.name} (type={type(c9_value)})")
+    await c9.write_value(CustomEnum.BAR)
+    await c9.subscribe(functools.partial(on_adapted_characteristic_update, c9))
 
 
 # -----------------------------------------------------------------------------
@@ -175,142 +221,213 @@ def on_characteristic_write(characteristic: gatt.Characteristic, value: Any) ->
     print(f"<<< WRITE: {characteristic} <- {value}  ({type(value)})")
 
 
+# -----------------------------------------------------------------------------
+async def server(device: Device) -> None:
+    # Static characteristic with a bytes value.
+    c1 = gatt.Characteristic(
+        CHARACTERISTIC_UUID_BASE + "01",
+        gatt.Characteristic.Properties.READ
+        | gatt.Characteristic.Properties.WRITE
+        | gatt.Characteristic.Properties.NOTIFY,
+        gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+        b'hello',
+    )
+
+    # Static characteristic with a string value.
+    c2 = gatt_adapters.UTF8CharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "02",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            'hello',
+        )
+    )
+
+    # Static characteristic with a tuple value.
+    c3 = gatt_adapters.PackedCharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "03",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            (1007, 1008, 1009),
+        ),
+        ">III",
+    )
+
+    # Static characteristic with a named tuple value.
+    c4 = gatt_adapters.MappedCharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "04",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            {"f1": 3007, "f2": 3008, "f3": 3009},
+        ),
+        ">III",
+        ["f1", "f2", "f3"],
+    )
+
+    # Static characteristic with a serializable value.
+    c5 = gatt_adapters.SerializableCharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "05",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            CustomSerializableClass(11, 12),
+        ),
+        CustomSerializableClass,
+    )
+
+    # Static characteristic with a delegated value.
+    c6 = gatt_adapters.DelegatedCharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "06",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            CustomClass(1, 2),
+        ),
+        encode=CustomClass.encode,
+        decode=CustomClass.decode,
+    )
+
+    # Dynamic characteristic with a bytes value.
+    c7 = gatt.Characteristic(
+        CHARACTERISTIC_UUID_BASE + "07",
+        gatt.Characteristic.Properties.READ
+        | gatt.Characteristic.Properties.WRITE
+        | gatt.Characteristic.Properties.NOTIFY,
+        gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+        gatt.CharacteristicValue(
+            read=lambda connection: dynamic_read("bytes"),
+            write=lambda connection, value: dynamic_write("bytes", value),
+        ),
+    )
+
+    # Dynamic characteristic with a string value.
+    c8 = gatt_adapters.UTF8CharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "08",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            gatt.CharacteristicValue(
+                read=lambda connection: dynamic_read("string"),
+                write=lambda connection, value: dynamic_write("string", value),
+            ),
+        )
+    )
+
+    # Static characteristic with an enum value
+    c9 = gatt_adapters.EnumCharacteristicAdapter(
+        gatt.Characteristic(
+            CHARACTERISTIC_UUID_BASE + "09",
+            gatt.Characteristic.Properties.READ
+            | gatt.Characteristic.Properties.WRITE
+            | gatt.Characteristic.Properties.NOTIFY,
+            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
+            CustomEnum.FOO,
+        ),
+        cls=CustomEnum,
+        length=3,
+        byteorder='big',
+    )
+
+    characteristics: List[gatt.Characteristic] = [
+        c1,
+        c2,
+        c3,
+        c4,
+        c5,
+        c6,
+        c7,
+        c8,
+        c9,
+    ]
+
+    # Listen for read and write events.
+    for characteristic in characteristics:
+        characteristic.on(
+            "read",
+            lambda _, value, c=characteristic: on_characteristic_read(c, value),
+        )
+        characteristic.on(
+            "write",
+            lambda _, value, c=characteristic: on_characteristic_write(c, value),
+        )
+
+    device.add_service(gatt.Service(SERVICE_UUID, characteristics))
+
+    # Notify every 3 seconds
+    i = 0
+    while True:
+        await asyncio.sleep(3)
+
+        # Notifying can be done with the characteristic's current value, or
+        # by explicitly passing a value to notify with. Both variants are used
+        # here: for c1..c4 we set the value and then notify, for c4..c9 we notify
+        # with an explicit value.
+        c1.value = f'hello c1 {i}'.encode()
+        await device.notify_subscribers(c1)
+        c2.value = f'hello c2 {i}'
+        await device.notify_subscribers(c2)
+        c3.value = (1000 + i, 2000 + i, 3000 + i)
+        await device.notify_subscribers(c3)
+        c4.value = {"f1": 4000 + i, "f2": 5000 + i, "f3": 6000 + i}
+        await device.notify_subscribers(c4)
+        await device.notify_subscribers(c5, CustomSerializableClass(1000 + i, 2000 + i))
+        await device.notify_subscribers(c6, CustomClass(3000 + i, 4000 + i))
+        await device.notify_subscribers(c7, bytes([1, 2, 3, i % 256]))
+        await device.notify_subscribers(c8, f'hello c8 {i}')
+        await device.notify_subscribers(
+            c9, CustomEnum.FOO if i % 2 == 0 else CustomEnum.BAR
+        )
+
+        i += 1
+
+
 # -----------------------------------------------------------------------------
 async def main() -> None:
     if len(sys.argv) < 2:
-        print("Usage: run_gatt_with_adapters.py <transport-spec> [<bluetooth-address>]")
+        print("Usage: run_gatt_with_adapters.py <transport-spec> client|server")
-        print("example: run_gatt_with_adapters.py usb:0 E1:CA:72:48:C4:E8")
+        print("example: run_gatt_with_adapters.py usb:0 F0:F1:F2:F3:F4:F5")
         return
 
     async with await transport.open_transport(sys.argv[1]) as hci_transport:
+        is_client = sys.argv[2] == "client"
+
         # Create a device to manage the host
         device = Device.with_hci(
             "Bumble",
-            hci.Address("F0:F1:F2:F3:F4:F5"),
+            hci.Address(
+                DEFAULT_CLIENT_ADDRESS if is_client else DEFAULT_SERVER_ADDRESS
+            ),
             hci_transport.source,
             hci_transport.sink,
         )
 
-        # Static characteristic with a bytes value.
-        c1 = gatt.Characteristic(
-            CHARACTERISTIC_UUID_BASE + "01",
-            gatt.Characteristic.Properties.READ | gatt.Characteristic.Properties.WRITE,
-            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-            b'hello',
-        )
-
-        # Static characteristic with a string value.
-        c2 = gatt.UTF8CharacteristicAdapter(
-            gatt.Characteristic(
-                CHARACTERISTIC_UUID_BASE + "02",
-                gatt.Characteristic.Properties.READ
-                | gatt.Characteristic.Properties.WRITE,
-                gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-                'hello',
-            )
-        )
-
-        # Static characteristic with a tuple value.
-        c3 = gatt.PackedCharacteristicAdapter(
-            gatt.Characteristic(
-                CHARACTERISTIC_UUID_BASE + "03",
-                gatt.Characteristic.Properties.READ
-                | gatt.Characteristic.Properties.WRITE,
-                gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-                (1007, 1008, 1009),
-            ),
-            ">III",
-        )
-
-        # Static characteristic with a named tuple value.
-        c4 = gatt.MappedCharacteristicAdapter(
-            gatt.Characteristic(
-                CHARACTERISTIC_UUID_BASE + "04",
-                gatt.Characteristic.Properties.READ
-                | gatt.Characteristic.Properties.WRITE,
-                gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-                {"f1": 3007, "f2": 3008, "f3": 3009},
-            ),
-            ">III",
-            ["f1", "f2", "f3"],
-        )
-
-        # Static characteristic with a serializable value.
-        c5 = gatt.SerializableCharacteristicAdapter(
-            gatt.Characteristic(
-                CHARACTERISTIC_UUID_BASE + "05",
-                gatt.Characteristic.Properties.READ
-                | gatt.Characteristic.Properties.WRITE,
-                gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-                CustomSerializableClass(11, 12),
-            ),
-            CustomSerializableClass,
-        )
-
-        # Static characteristic with a delegated value.
-        c6 = gatt.DelegatedCharacteristicAdapter(
-            gatt.Characteristic(
-                CHARACTERISTIC_UUID_BASE + "06",
-                gatt.Characteristic.Properties.READ
-                | gatt.Characteristic.Properties.WRITE,
-                gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-                CustomClass(1, 2),
-            ),
-            encode=CustomClass.encode,
-            decode=CustomClass.decode,
-        )
-
-        # Dynamic characteristic with a bytes value.
-        c7 = gatt.Characteristic(
-            CHARACTERISTIC_UUID_BASE + "07",
-            gatt.Characteristic.Properties.READ | gatt.Characteristic.Properties.WRITE,
-            gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-            gatt.CharacteristicValue(
-                read=lambda connection: dynamic_read("bytes"),
-                write=lambda connection, value: dynamic_write("bytes", value),
-            ),
-        )
-
-        # Dynamic characteristic with a string value.
-        c8 = gatt.UTF8CharacteristicAdapter(
-            gatt.Characteristic(
-                CHARACTERISTIC_UUID_BASE + "08",
-                gatt.Characteristic.Properties.READ
-                | gatt.Characteristic.Properties.WRITE,
-                gatt.Characteristic.READABLE | gatt.Characteristic.WRITEABLE,
-                gatt.CharacteristicValue(
-                    read=lambda connection: dynamic_read("string"),
-                    write=lambda connection, value: dynamic_write("string", value),
-                ),
-            )
-        )
-
-        characteristics: List[
-            Union[gatt.Characteristic, gatt.CharacteristicAdapter]
-        ] = [c1, c2, c3, c4, c5, c6, c7, c8]
-
-        # Listen for read and write events.
-        for characteristic in characteristics:
-            characteristic.on(
-                "read",
-                lambda _, value, c=characteristic: on_characteristic_read(c, value),
-            )
-            characteristic.on(
-                "write",
-                lambda _, value, c=characteristic: on_characteristic_write(c, value),
-            )
-
-        device.add_service(gatt.Service(SERVICE_UUID, characteristics))  # type: ignore
-
         # Get things going
         await device.power_on()
 
-        # Connect to a peer
+        if is_client:
-        if len(sys.argv) > 2:
+            # Connect a client to a peer
-            await client(device, hci.Address(sys.argv[2]))
+            await client(device, hci.Address(DEFAULT_SERVER_ADDRESS))
         else:
+            # Advertise so a peer can connect
             await device.start_advertising(auto_restart=True)
 
+            # Setup a server
+            await server(device)
+
         await hci_transport.source.wait_for_termination()
 
 

examples/run_hfp_gateway.py

@@ -28,9 +28,7 @@ import websockets
 import bumble.core
 from bumble.device import Device, ScoLink
 from bumble.transport import open_transport_or_link
-from bumble.core import (
+from bumble.core import PhysicalTransport
-    BT_BR_EDR_TRANSPORT,
-)
 from bumble import hci, rfcomm, hfp
 
 
@@ -234,7 +232,7 @@ async def main() -> None:
             target_address = sys.argv[3]
             print(f'=== Connecting to {target_address}...')
             connection = await device.connect(
-                target_address, transport=BT_BR_EDR_TRANSPORT
+                target_address, transport=PhysicalTransport.BR_EDR
             )
             print(f'=== Connected to {connection.peer_address}!')