code: def close_stream_transport(self, stream_transport, timeout):
      
      with self._stream_transport_map_lock:
        if stream_transport.local_id in self._stream_transport_map:
          del self._stream_transport_map[stream_transport.local_id]
          # If we never got a remote_id, there's no CLSE message to send.
          if stream_transport.remote_id:
            self.transport.write_message(adb_message.AdbMessage(
                'CLSE', stream_transport.local_id, stream_transport.remote_id),
                                         timeout)
          return True
      return False
docs: Remove the given stream transport's id from our map of id's.
  
      If the stream id is actually removed, we send a CLSE message to let the
      remote end know (this happens when we are ack'ing a CLSE message we
      received).  The ADB protocol doesn't say this is a requirement, but ADB
      does it, so we do too.
  
      Args:
        stream_transport: The stream transport to close.
        timeout: Timeout on the operation.
  
      Returns:
        True if the id was removed and message sent, False if it was already
      missing from the stream map (already closed).