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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 bumble.logging
from bumble.core import UUID
from bumble.device import Device
from bumble.rfcomm import Server, make_service_sdp_records
from bumble.transport import open_transport
from bumble.utils import AsyncRunner
# -----------------------------------------------------------------------------
def sdp_records(channel, uuid):
service_record_handle = 0x00010001
return {
service_record_handle: make_service_sdp_records(
service_record_handle, channel, UUID(uuid)
)
}
# -----------------------------------------------------------------------------
def on_rfcomm_session(rfcomm_session, tcp_server):
print('*** RFComm session connected', rfcomm_session)
tcp_server.attach_session(rfcomm_session)
# -----------------------------------------------------------------------------
class TcpServerProtocol(asyncio.Protocol):
def __init__(self, server):
self.server = server
def connection_made(self, transport):
peer_name = transport.get_extra_info('peer_name')
print(f'<<< TCP Server: connection from {peer_name}')
if self.server:
self.server.tcp_transport = transport
else:
transport.close()
def connection_lost(self, exc):
print('<<< TCP Server: connection lost')
if self.server:
self.server.tcp_transport = None
def data_received(self, data):
print(f'<<< TCP Server: data received: {len(data)} bytes - {data.hex()}')
if self.server:
self.server.tcp_data_received(data)
# -----------------------------------------------------------------------------
class TcpServer:
def __init__(self, port):
self.rfcomm_session = None
self.tcp_transport = None
AsyncRunner.spawn(self.run(port))
def attach_session(self, rfcomm_session):
if self.rfcomm_session:
self.rfcomm_session.sink = None
self.rfcomm_session = rfcomm_session
rfcomm_session.sink = self.rfcomm_data_received
def rfcomm_data_received(self, data):
print(f'<<< RFCOMM Data: {data.hex()}')
if self.tcp_transport:
self.tcp_transport.write(data)
else:
print('!!! no TCP connection, dropping data')
def tcp_data_received(self, data):
if self.rfcomm_session:
self.rfcomm_session.write(data)
else:
print('!!! no RFComm session, dropping data')
async def run(self, port):
print(f'$$$ Starting TCP server on port {port}')
server = await asyncio.get_running_loop().create_server(
lambda: TcpServerProtocol(self), '127.0.0.1', port
)
async with server:
await server.serve_forever()
# -----------------------------------------------------------------------------
async def main() -> None:
if len(sys.argv) < 4:
print(
'Usage: run_rfcomm_server.py <device-config> <transport-spec> '
'<tcp-port> [<uuid>]'
)
print('example: run_rfcomm_server.py classic2.json usb:0 8888')
return
tcp_port = int(sys.argv[3])
if len(sys.argv) >= 5:
uuid = sys.argv[4]
else:
uuid = 'E6D55659-C8B4-4B85-96BB-B1143AF6D3AE'
print('<<< connecting to HCI...')
async with await open_transport(sys.argv[2]) as hci_transport:
print('<<< connected')
# Create a device
device = Device.from_config_file_with_hci(
sys.argv[1], hci_transport.source, hci_transport.sink
)
device.classic_enabled = True
# Create a TCP server
tcp_server = TcpServer(tcp_port)
# Create and register an RFComm server
rfcomm_server = Server(device)
# Listen for incoming DLC connections
channel_number = rfcomm_server.listen(
lambda session: on_rfcomm_session(session, tcp_server)
)
print(f'### Listening for RFComm connections on channel {channel_number}')
# Setup the SDP to advertise this channel
device.sdp_service_records = sdp_records(channel_number, uuid)
# Start the controller
await device.power_on()
# Start being discoverable and connectable
await device.set_discoverable(True)
await device.set_connectable(True)
await hci_transport.source.wait_for_termination()
# -----------------------------------------------------------------------------
bumble.logging.setup_basic_logging('DEBUG')
asyncio.run(main())
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