docs: def stop(self):
          """Stop the gateway."""
          _LOGGER.info('Stopping gateway')
          self._disconnect()
          if self.connect_task and not self.connect_task.cancelled():
              self.connect_task.cancel()
              self.connect_task = None
          if not self.persistence:
              return
          if self._cancel_save is not None:
              self._cancel_save()
              self._cancel_save = None
          yield from self.loop.run_in_executor(
              None, self.persistence.save_sensors)