code: def set_sampling_strategies(self, filter, strategy_and_parms):
          
          result_list = yield self.list_sensors(filter=filter)
          sensor_dict = {}
          for result in result_list:
              sensor_name = result.object.normalised_name
              resource_name = result.object.parent_name
              if resource_name not in sensor_dict:
                  sensor_dict[resource_name] = {}
              try:
                  resource_obj = self.children[resource_name]
                  yield resource_obj.set_sampling_strategy(sensor_name, strategy_and_parms)
                  sensor_dict[resource_name][sensor_name] = strategy_and_parms
                  self._logger.debug(
                      'Set sampling strategy on resource %s for %s'
                      % (resource_name, sensor_name))
              except Exception as exc:
                  self._logger.error(
                      'Cannot set sampling strategy on resource %s for %s (%s)'
                      % (resource_name, sensor_name, exc))
                  sensor_dict[resource_name][sensor_name] = None
          raise tornado.gen.Return(sensor_dict)
docs: Set sampling strategies for filtered sensors - these sensors have to exsist