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Peer to peer connection custom signaling server(tcp-socket)

See original GitHub issue

I am trying to make peer to peer connection from raspbarryPi to another webserver for webcam stream, where I have to usecustom signalling server using peerjs-server https://github.com/peers/peerjs-server.

Basically I am using the code from datachannel client example https://github.com/aiortc/aiortc/tree/master/examples/datachannel-cli

The signaling server run at 192.168.1.140 and pot 7000, I confirmed signaling server is working by running html/js webrtc sample.

But when I run below code, I am getting the some error.

python3 test.py offer --signaling tcp-socket --signaling-host 192.168.1.140 --signaling-port 7000 --signaling-path /

parser = argparse.ArgumentParser(description="Data channels ping/pong")
  parser.add_argument("role", choices=["offer", "answer"])
  parser.add_argument("--verbose", "-v", action="count")
  add_signaling_arguments(parser)

  args = parser.parse_args()

  if args.verbose:
      logging.basicConfig(level=logging.DEBUG)

  signaling = TcpSocketSignaling("192.168.1.140","7000")
  pc = RTCPeerConnection()
  if args.role == "offer":
      coro = run_offer(pc, signaling)
  else:
      coro = run_answer(pc, signaling)

  # run event loop
  loop = asyncio.get_event_loop()
  try:
      loop.run_until_complete(coro)
  except KeyboardInterrupt:
      pass
  finally:
      loop.run_until_complete(pc.close())
      loop.run_until_complete(signaling.close())

Error:

channel(chat) - created by local party
Traceback (most recent call last):
  File "test.py", line 119, in <module>
    loop.run_until_complete(coro)
  File "/usr/lib/python3.7/asyncio/base_events.py", line 584, in run_until_complete
    return future.result()
  File "test.py", line 93, in run_offer
    await signaling.send(pc.localDescription)
  File "/home/pi/.local/lib/python3.7/site-packages/aiortc/contrib/signaling.py", line 203, in send
    await self._connect(True)
  File "/home/pi/.local/lib/python3.7/site-packages/aiortc/contrib/signaling.py", line 176, in _connect
    client_connected, host=self._host, port=self._port
  File "/usr/lib/python3.7/asyncio/streams.py", line 114, in start_server
    return await loop.create_server(factory, host, port, **kwds)
  File "/usr/lib/python3.7/asyncio/base_events.py", line 1378, in create_server
    % (sa, err.strerror.lower())) from None
OSError: [Errno 99] error while attempting to bind on address ('192.168.1.140', 7000): cannot assign requested address