docs: def SensorMetatagsGet(self, sensor_id, namespace = None):
          """
              Retrieve the metatags of a sensor.
              
              @param sensor_id (int) - Id of the sensor to retrieve metatags from
              @param namespace (stirng) - Namespace for which to retrieve metatags.
              
              @return (bool) - Boolean indicating whether SensorMetatagsGet was successful
          """
          ns = "default" if namespace is None else namespace
          if self.__SenseApiCall__('/sensors/{0}/metatags.json'.format(sensor_id), 'GET', parameters = {'namespace': ns}):
              return True
          else:
              self.__error__ = "api call unsuccessful"
              return False