189 lines
7.3 KiB
Python
189 lines
7.3 KiB
Python
# Copyright 2021-2022 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 colors import color
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from bumble.device import Device
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from bumble.transport import open_transport_or_link
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from bumble.core import (
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BT_BR_EDR_TRANSPORT,
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BT_AVDTP_PROTOCOL_ID,
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BT_AUDIO_SINK_SERVICE,
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BT_L2CAP_PROTOCOL_ID
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)
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from bumble.avdtp import (
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Protocol as AVDTP_Protocol,
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find_avdtp_service_with_connection
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)
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from bumble.a2dp import make_audio_source_service_sdp_records
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from bumble.sdp import (
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Client as SDP_Client,
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ServiceAttribute,
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DataElement,
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SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
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SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
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SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
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)
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# -----------------------------------------------------------------------------
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def sdp_records():
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service_record_handle = 0x00010001
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return {
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service_record_handle: make_audio_source_service_sdp_records(service_record_handle)
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}
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# -----------------------------------------------------------------------------
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async def find_a2dp_service(device, connection):
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# Connect to the SDP Server
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sdp_client = SDP_Client(device)
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await sdp_client.connect(connection)
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# Search for services with an Audio Sink service class
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search_result = await sdp_client.search_attributes(
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[BT_AUDIO_SINK_SERVICE],
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[
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SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
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SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
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SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
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]
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)
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print(color('==================================', 'blue'))
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print(color('A2DP Sink Services:', 'yellow'))
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service_version = None
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for attribute_list in search_result:
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print(color('SERVICE:', 'green'))
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# Service classes
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service_class_id_list = ServiceAttribute.find_attribute_in_list(
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attribute_list,
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SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
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)
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if service_class_id_list:
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if service_class_id_list.value:
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print(color(' Service Classes:', 'green'))
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for service_class_id in service_class_id_list.value:
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print(' ', service_class_id.value)
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# Protocol info
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protocol_descriptor_list = ServiceAttribute.find_attribute_in_list(
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attribute_list,
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SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID
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)
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if protocol_descriptor_list:
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print(color(' Protocol:', 'green'))
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for protocol_descriptor in protocol_descriptor_list.value:
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if protocol_descriptor.value[0].value == BT_L2CAP_PROTOCOL_ID:
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if len(protocol_descriptor.value) >= 2:
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psm = protocol_descriptor.value[1].value
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print(f'{color(" L2CAP PSM:", "cyan")} {psm}')
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elif protocol_descriptor.value[0].value == BT_AVDTP_PROTOCOL_ID:
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if len(protocol_descriptor.value) >= 2:
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avdtp_version_major = protocol_descriptor.value[1].value >> 8
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avdtp_version_minor = protocol_descriptor.value[1].value & 0xFF
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print(f'{color(" AVDTP Version:", "cyan")} {avdtp_version_major}.{avdtp_version_minor}')
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service_version = (avdtp_version_major, avdtp_version_minor)
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# Profile info
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bluetooth_profile_descriptor_list = ServiceAttribute.find_attribute_in_list(
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attribute_list,
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SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID
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)
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if bluetooth_profile_descriptor_list:
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if bluetooth_profile_descriptor_list.value:
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if bluetooth_profile_descriptor_list.value[0].type == DataElement.SEQUENCE:
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bluetooth_profile_descriptors = bluetooth_profile_descriptor_list.value
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else:
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# Sometimes, instead of a list of lists, we just find a list. Fix that
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bluetooth_profile_descriptors = [bluetooth_profile_descriptor_list]
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print(color(' Profiles:', 'green'))
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for bluetooth_profile_descriptor in bluetooth_profile_descriptors:
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version_major = bluetooth_profile_descriptor.value[1].value >> 8
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version_minor = bluetooth_profile_descriptor.value[1].value & 0xFF
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print(f' {bluetooth_profile_descriptor.value[0].value} - version {version_major}.{version_minor}')
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await sdp_client.disconnect()
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return service_version
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# -----------------------------------------------------------------------------
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async def main():
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if len(sys.argv) < 4:
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print('Usage: run_a2dp_info.py <device-config> <transport-spec> <bt-addr>')
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print('example: run_a2dp_info.py classic1.json usb:0 14:7D:DA:4E:53:A8')
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return
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print('<<< connecting to HCI...')
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async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
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print('<<< connected')
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# Create a device
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device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
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device.classic_enabled = True
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# Start the controller
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await device.power_on()
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# Setup the SDP to expose a SRC service, in case the remote device queries us back
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device.sdp_service_records = sdp_records()
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# Connect to a peer
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target_address = sys.argv[3]
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print(f'=== Connecting to {target_address}...')
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connection = await device.connect(target_address, transport=BT_BR_EDR_TRANSPORT)
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print(f'=== Connected to {connection.peer_address}!')
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# Request authentication
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print('*** Authenticating...')
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await connection.authenticate()
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print('*** Authenticated')
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# Enable encryption
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print('*** Enabling encryption...')
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await connection.encrypt()
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print('*** Encryption on')
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# Look for an A2DP service
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avdtp_version = await find_a2dp_service(device, connection)
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if not avdtp_version:
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print(color('!!! no AVDTP service found'))
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return
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print(f'AVDTP version: {avdtp_version[0]}.{avdtp_version[1]}')
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# Create a client to interact with the remote device
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client = await AVDTP_Protocol.connect(connection, avdtp_version)
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# Discover all endpoints on the remote device
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endpoints = await client.discover_remote_endpoints()
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print(f'@@@ Found {len(endpoints)} endpoints')
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for endpoint in endpoints:
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print('@@@', endpoint)
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# -----------------------------------------------------------------------------
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logging.basicConfig(level = os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
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asyncio.run(main())
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