code: def guess_message_type(message):
      
      if isinstance(message, APPConfigMessage):
          return MsgType.CONFIG
      elif isinstance(message, APPJoinMessage):
          return MsgType.JOIN
      elif isinstance(message, APPDataMessage):
          # All inheriting from this first !!
          return MsgType.DATA
      elif isinstance(message, APPUpdateMessage):
          return MsgType.UPDATE
      elif isinstance(message, APPUnjoinMessage):
          return MsgType.UNJOIN
      # APPMessage -> ACK?
      return None
docs: Guess the message type based on the class of message
  
      :param message: Message to guess the type for
      :type message: APPMessage
      :return: The corresponding message  type (MsgType) or None if not found
      :rtype: None | int