code: def _service_observable_out_box(self, limit: int = None) -> int:
          
          msg_count = 0
          while True:
              if limit and msg_count >= limit:
                  break
  
              msg = self._observable.get_output()
              if not msg:
                  break
  
              msg_count += 1
              msg, observer_ids = msg
              # TODO: it's assumed that all Observers are connected the same way as Validators
              self.sendToNodes(msg, observer_ids)
          return msg_count
docs: Service at most `limit` number of messages from the observable's outBox.
  
          :return: the number of messages successfully serviced.