docs: def onMessage(self, payload, is_binary):
          """
          Called when a client sends a message
          """
          if not is_binary:
              payload = payload.decode('utf-8')
  
              logger.debug("Incoming message ({peer}) : {message}".format(
                  peer=self.peer, message=payload))
  
              # Publish ON_RECEIVE message
              self.factory.mease.publisher.publish(
                  message_type=ON_RECEIVE,
                  client_id=self._client_id,
                  client_storage=self.storage,
                  message=payload)