code: def _handle_presentation(self, msg):
          
          ret_msg = handle_presentation(msg)
          if msg.child_id == 255 or ret_msg is None:
              return
          # this is a presentation of a child sensor
          topics = [
              '{}/{}/{}/{}/+/+'.format(
                  self._in_prefix, str(msg.node_id), str(msg.child_id),
                  msg_type)
              for msg_type in (int(self.const.MessageType.set),
                               int(self.const.MessageType.req))
          ]
          topics.append('{}/{}/+/{}/+/+'.format(
              self._in_prefix, str(msg.node_id),
              int(self.const.MessageType.stream)))
          self._handle_subscription(topics)
docs: Process a MQTT presentation message.