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# Copyright 2021-2022 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
import asyncio
import sys
import os
import logging
from bumble.colors import color
import bumble.core
from bumble.device import Device
from bumble.transport import open_transport_or_link
from bumble.core import (
BT_L2CAP_PROTOCOL_ID,
BT_RFCOMM_PROTOCOL_ID,
BT_BR_EDR_TRANSPORT,
)
from bumble.rfcomm import Client
from bumble.sdp import (
Client as SDP_Client,
DataElement,
ServiceAttribute,
SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
)
# -----------------------------------------------------------------------------
async def list_rfcomm_channels(connection):
# Connect to the SDP Server
sdp_client = SDP_Client(connection)
await sdp_client.connect()
# Search for services with an L2CAP service attribute
search_result = await sdp_client.search_attributes(
[BT_L2CAP_PROTOCOL_ID],
[
SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID,
SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID,
],
)
print(color('==================================', 'blue'))
print(color('RFCOMM Services:', 'yellow'))
# pylint: disable-next=too-many-nested-blocks
for attribute_list in search_result:
# Look for the RFCOMM Channel number
protocol_descriptor_list = ServiceAttribute.find_attribute_in_list(
attribute_list, SDP_PROTOCOL_DESCRIPTOR_LIST_ATTRIBUTE_ID
)
if protocol_descriptor_list:
for protocol_descriptor in protocol_descriptor_list.value:
if len(protocol_descriptor.value) >= 2:
if protocol_descriptor.value[0].value == BT_RFCOMM_PROTOCOL_ID:
print(color('SERVICE:', 'green'))
print(
color(' RFCOMM Channel:', 'cyan'),
protocol_descriptor.value[1].value,
)
# List profiles
bluetooth_profile_descriptor_list = (
ServiceAttribute.find_attribute_in_list(
attribute_list,
SDP_BLUETOOTH_PROFILE_DESCRIPTOR_LIST_ATTRIBUTE_ID,
)
)
if bluetooth_profile_descriptor_list:
if bluetooth_profile_descriptor_list.value:
if (
bluetooth_profile_descriptor_list.value[0].type
== DataElement.SEQUENCE
):
bluetooth_profile_descriptors = (
bluetooth_profile_descriptor_list.value
)
else:
# Sometimes, instead of a list of lists, we just
# find a list. Fix that
bluetooth_profile_descriptors = [
bluetooth_profile_descriptor_list
]
print(color(' Profiles:', 'green'))
for (
bluetooth_profile_descriptor
) in bluetooth_profile_descriptors:
version_major = (
bluetooth_profile_descriptor.value[1].value >> 8
)
version_minor = (
bluetooth_profile_descriptor.value[1].value
& 0xFF
)
print(
' '
f'{bluetooth_profile_descriptor.value[0].value}'
f' - version {version_major}.{version_minor}'
)
# List service classes
service_class_id_list = ServiceAttribute.find_attribute_in_list(
attribute_list, SDP_SERVICE_CLASS_ID_LIST_ATTRIBUTE_ID
)
if service_class_id_list:
if service_class_id_list.value:
print(color(' Service Classes:', 'green'))
for service_class_id in service_class_id_list.value:
print(' ', service_class_id.value)
await sdp_client.disconnect()
# -----------------------------------------------------------------------------
class TcpServerProtocol(asyncio.Protocol):
def __init__(self, rfcomm_session):
self.rfcomm_session = rfcomm_session
self.transport = None
def connection_made(self, transport):
peer_name = transport.get_extra_info('peer_name')
print(f'<<< TCP Server: connection from {peer_name}')
self.transport = transport
self.rfcomm_session.sink = self.rfcomm_data_received
def rfcomm_data_received(self, data):
print(f'<<< RFCOMM Data: {data.hex()}')
if self.transport:
self.transport.write(data)
else:
print('!!! no TCP connection, dropping data')
def data_received(self, data):
print(f'<<< TCP Server: data received: {len(data)} bytes - {data.hex()}')
self.rfcomm_session.write(data)
# -----------------------------------------------------------------------------
async def tcp_server(tcp_port, rfcomm_session):
print(f'$$$ Starting TCP server on port {tcp_port}')
server = await asyncio.get_running_loop().create_server(
lambda: TcpServerProtocol(rfcomm_session), '127.0.0.1', tcp_port
)
await asyncio.get_running_loop().create_future()
async with server:
await server.serve_forever()
# -----------------------------------------------------------------------------
async def main():
if len(sys.argv) < 5:
print(
'Usage: run_rfcomm_client.py <device-config> <transport-spec> '
'<bluetooth-address> <channel>|discover [tcp-port]'
)
print(
' specifying a channel number, or "discover" to list all RFCOMM channels'
)
print('example: run_rfcomm_client.py classic1.json usb:0 E1:CA:72:48:C4:E8 8')
return
print('<<< connecting to HCI...')
async with await open_transport_or_link(sys.argv[2]) as (hci_source, hci_sink):
print('<<< connected')
# Create a device
device = Device.from_config_file_with_hci(sys.argv[1], hci_source, hci_sink)
device.classic_enabled = True
await device.power_on()
# 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)
print(f'=== Connected to {connection.peer_address}!')
channel = sys.argv[4]
if channel == 'discover':
await list_rfcomm_channels(connection)
return
# Request authentication
print('*** Authenticating...')
await connection.authenticate()
print('*** Authenticated')
# Enable encryption
print('*** Enabling encryption...')
await connection.encrypt()
print('*** Encryption on')
# Create a client and start it
print('@@@ Starting RFCOMM client...')
rfcomm_client = Client(connection)
rfcomm_mux = await rfcomm_client.start()
print('@@@ Started')
channel = int(channel)
print(f'### Opening session for channel {channel}...')
try:
session = await rfcomm_mux.open_dlc(channel)
print('### Session open', session)
except bumble.core.ConnectionError as error:
print(f'### Session open failed: {error}')
await rfcomm_mux.disconnect()
print('@@@ Disconnected from RFCOMM server')
return
if len(sys.argv) == 6:
# A TCP port was specified, start listening
tcp_port = int(sys.argv[5])
asyncio.create_task(tcp_server(tcp_port, session))
await hci_source.wait_for_termination()
# -----------------------------------------------------------------------------
logging.basicConfig(level=os.environ.get('BUMBLE_LOGLEVEL', 'DEBUG').upper())
asyncio.run(main())
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