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basic AMS implementation
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Gilles Boccon-Gibod
220
examples/run_ams_client.py
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220
examples/run_ams_client.py
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# Copyright 2025 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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# -----------------------------------------------------------------------------
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# Imports
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# -----------------------------------------------------------------------------
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import asyncio
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import sys
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import os
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import logging
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from bumble.colors import color
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from bumble.device import Device, Peer
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from bumble.transport import open_transport
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from bumble.profiles.ams import (
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AmsClient,
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EntityId,
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PlayerAttributeId,
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QueueAttributeId,
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TrackAttributeId,
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RemoteCommandId,
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)
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# -----------------------------------------------------------------------------
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async def handle_command_client(
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ams_client: AmsClient, reader: asyncio.StreamReader, writer: asyncio.StreamWriter
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) -> None:
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while True:
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command = (await reader.readline()).decode("utf-8")
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if not command.endswith("\n"):
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print("command client terminated")
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return
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command = command.strip()
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try:
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if command.upper() in [member.name for member in RemoteCommandId]:
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await ams_client.command(RemoteCommandId[command.upper()])
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continue
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except Exception as error:
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writer.write(f"ERROR: {error}\n".encode("utf-8"))
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writer.write(f"unknown command {command}\n".encode("utf-8"))
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# -----------------------------------------------------------------------------
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async def main() -> None:
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if len(sys.argv) < 3:
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print(
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'Usage: run_ams_client.py <device-config> <transport-spec> '
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'<bluetooth-address> <mtu>'
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)
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print('example: run_ams_client.py device1.json usb:0 E1:CA:72:48:C4:E8 512')
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return
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device_config, transport_spec, bluetooth_address, mtu = sys.argv[1:]
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print('<<< connecting to HCI...')
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async with await open_transport(transport_spec) as hci_transport:
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print('<<< connected')
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# Create a device to manage the host, with a custom listener
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device = Device.from_config_file_with_hci(
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device_config, hci_transport.source, hci_transport.sink
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)
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await device.power_on()
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# Connect to the peer
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print(f'=== Connecting to {bluetooth_address}...')
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connection = await device.connect(bluetooth_address)
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print(f'=== Connected: {connection}')
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await connection.encrypt()
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peer = Peer(connection)
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mtu_int = int(mtu)
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if mtu_int:
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new_mtu = await peer.request_mtu(mtu_int)
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print(f'ATT MTU = {new_mtu}')
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ams_client = await AmsClient.for_peer(peer)
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if ams_client is None:
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print("!!! no AMS service found")
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return
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# Register event handlers
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def on_supported_commands():
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print(
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color("Supported commands:", "magenta"),
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", ".join([command.name for command in ams_client.supported_commands]),
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)
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ams_client.on(AmsClient.EVENT_SUPPORTED_COMMANDS, on_supported_commands)
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def on_player_name():
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print(color("Player Name:", "green"), ams_client.player_name)
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ams_client.on(AmsClient.EVENT_PLAYER_NAME, on_player_name)
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def on_player_playback_info():
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print(
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color("Playback State:", "green"),
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ams_client.player_playback_info.playback_state.name,
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)
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print(
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color("Playback Rate: ", "green"),
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ams_client.player_playback_info.playback_rate,
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)
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print(
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color("Elapsed Time: ", "green"),
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ams_client.player_playback_info.elapsed_time,
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)
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ams_client.on(AmsClient.EVENT_PLAYER_PLAYBACK_INFO, on_player_playback_info)
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def on_player_volume():
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print(color("Volume:", "green"), ams_client.player_volume)
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ams_client.on(AmsClient.EVENT_PLAYER_VOLUME, on_player_volume)
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def on_queue_count():
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print(color("Queue Count:", "yellow"), ams_client.queue_count)
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ams_client.on(AmsClient.EVENT_QUEUE_COUNT, on_queue_count)
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def on_queue_index():
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print(color("Queue Index:", "yellow"), ams_client.queue_index)
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ams_client.on(AmsClient.EVENT_QUEUE_INDEX, on_queue_index)
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def on_queue_shuffle_mode():
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print(
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color("Queue Shuffle Mode:", "yellow"),
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ams_client.queue_shuffle_mode.name,
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)
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ams_client.on(AmsClient.EVENT_QUEUE_SHUFFLE_MODE, on_queue_shuffle_mode)
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def on_queue_repeat_mode():
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print(
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color("Queue Repeat Mode:", "yellow"), ams_client.queue_repeat_mode.name
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)
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ams_client.on(AmsClient.EVENT_QUEUE_REPEAT_MODE, on_queue_repeat_mode)
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def on_track_artist():
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print(color("Track Artist:", "cyan"), ams_client.track_artist)
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ams_client.on(AmsClient.EVENT_TRACK_ARTIST, on_track_artist)
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def on_track_album():
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print(color("Track Album:", "cyan"), ams_client.track_album)
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ams_client.on(AmsClient.EVENT_TRACK_ALBUM, on_track_album)
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def on_track_title():
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print(color("Track Title:", "cyan"), ams_client.track_title)
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ams_client.on(AmsClient.EVENT_TRACK_TITLE, on_track_title)
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def on_track_duration():
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print(color("Track Duration:", "cyan"), ams_client.track_duration)
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ams_client.on(AmsClient.EVENT_TRACK_DURATION, on_track_duration)
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# Start the client
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await ams_client.start()
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# Observe the player, queue and track
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await ams_client.observe(
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EntityId.PLAYER,
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[
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PlayerAttributeId.NAME,
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PlayerAttributeId.PLAYBACK_INFO,
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PlayerAttributeId.VOLUME,
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],
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)
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await ams_client.observe(
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EntityId.QUEUE,
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[
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QueueAttributeId.COUNT,
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QueueAttributeId.INDEX,
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QueueAttributeId.REPEAT_MODE,
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QueueAttributeId.SHUFFLE_MODE,
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],
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)
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await ams_client.observe(
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EntityId.TRACK,
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[
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TrackAttributeId.ALBUM,
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TrackAttributeId.ARTIST,
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TrackAttributeId.DURATION,
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TrackAttributeId.TITLE,
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],
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)
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# Accept a TCP connection to handle commands.
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tcp_server = await asyncio.start_server(
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lambda reader, writer: handle_command_client(ams_client, reader, writer),
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'127.0.0.1',
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9000,
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)
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print("Accepting command client on port 9000")
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async with tcp_server:
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await tcp_server.serve_forever()
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# -----------------------------------------------------------------------------
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logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'INFO').upper())
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asyncio.run(main())
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