How to use the snitun.multiplexer.message.MultiplexerMessage function in snitun

# check if message exists
            if message.channel_id not in self._channels:
                _LOGGER.debug("Receive close from unknown channel")
                return
            channel = self._channels.pop(message.channel_id)
            channel.close()

        # Ping
        elif message.flow_type == CHANNEL_FLOW_PING:
            if message.extra.startswith(b"pong"):
                _LOGGER.debug("Receive pong from peer / reset healthy")
                self._healthy.set()
            else:
                _LOGGER.debug("Receive ping from peer / send pong")
                self._write_message(
                    MultiplexerMessage(
                        message.channel_id, CHANNEL_FLOW_PING, b"", b"pong"
                    )
                )

        else:
            _LOGGER.warning("Receive unknown message type")

header = self._crypto.decrypt(header)
            channel_id = header[:16]
            flow_type = header[16]
            data_size = int.from_bytes(header[17:21], byteorder="big")
            extra = header[21:]
        except (IndexError, MultiplexerTransportDecrypt):
            _LOGGER.warning("Wrong message header received")
            return

        # Read message data
        if data_size:
            data = await self._reader.readexactly(data_size)
        else:
            data = b""

        message = MultiplexerMessage(
            uuid.UUID(bytes=channel_id), flow_type, data, extra
        )

        # Process message to queue
        await self._process_message(message)