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# 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.
# -----------------------------------------------------------------------------
# Imports
# -----------------------------------------------------------------------------
from __future__ import annotations
import argparse
import asyncio
import sys
import bumble.logging
from bumble import core, l2cap
from bumble.device import Device
from bumble.transport import open_transport
# -----------------------------------------------------------------------------
async def main(
config_file: str, transport: str, mode: int, peer_address: str, psm: int
) -> None:
print('<<< connecting to HCI...')
async with await open_transport(transport) as hci_transport:
print('<<< connected')
# Create a device
device = Device.from_config_file_with_hci(
config_file, hci_transport.source, hci_transport.sink
)
device.classic_enabled = True
device.l2cap_channel_manager.extended_features.add(
l2cap.L2CAP_Information_Request.ExtendedFeatures.ENHANCED_RETRANSMISSION_MODE
)
device.l2cap_channel_manager.extended_features.add(
l2cap.L2CAP_Information_Request.ExtendedFeatures.FCS_OPTION
)
# Start the controller
await device.power_on()
# Start being discoverable and connectable
await device.set_discoverable(True)
await device.set_connectable(True)
active_channel: l2cap.ClassicChannel | None = None
def on_connection(channel: l2cap.ClassicChannel):
def on_sdu(sdu: bytes):
print(f'<<< {sdu.decode()}')
channel.sink = on_sdu
nonlocal active_channel
active_channel = channel
server = device.create_l2cap_server(
spec=l2cap.ClassicChannelSpec(
mode=l2cap.TransmissionMode(mode), psm=psm if psm else None
),
handler=on_connection,
)
print(f'Listen L2CAP on channel {server.psm}')
if peer_address:
connection = await device.connect(
peer_address, transport=core.PhysicalTransport.BR_EDR
)
channel = await connection.create_l2cap_channel(
spec=l2cap.ClassicChannelSpec(
mode=l2cap.TransmissionMode(mode), psm=psm
)
)
active_channel = channel
while sdu := await asyncio.to_thread(lambda: input('>>> ')):
if active_channel:
active_channel.write(sdu.encode())
await hci_transport.source.terminated
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('INFO')
parser = argparse.ArgumentParser()
parser.add_argument('config')
parser.add_argument('transport')
parser.add_argument('-p', '--peer_address', default='')
parser.add_argument(
'-m', '--mode', default=l2cap.TransmissionMode.ENHANCED_RETRANSMISSION
)
parser.add_argument('--psm', default=0)
args = parser.parse_args(sys.argv[1:])
asyncio.run(main(args.config, args.transport, args.mode, args.peer_address, args.psm))
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