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

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