code: def __perform_unsolicited_callbacks(self, msg):
          
          type_ = msg[M_TYPE]
          payload = msg[M_PAYLOAD]
  
          # callbacks for responses which might be unsolicited (e.g. created or deleted)
          if type_ in _RSP_PAYLOAD_CB_MAPPING:
              self.__fire_callback(_RSP_PAYLOAD_CB_MAPPING[type_], msg)
  
          # Perform callbacks for feed data
          elif type_ == E_FEEDDATA:
              self.__simulate_feeddata(payload[P_FEED_ID], *self.__decode_data_time(payload))
  
          # Perform callbacks for unsolicited subscriber message
          elif type_ == E_SUBSCRIBED:
              self.__fire_callback(_CB_SUBSCRIPTION, payload)
  
          else:
              logger.error('Unexpected message type for unsolicited callback %s', type_)
docs: Callbacks for which a client reference is either optional or does not apply at all