code: def read_stream(self, stream_id, since_epoch):
          ''' get datafeed '''
          response, status_code = self.__agent__.Messages.get_v4_stream_sid_message(
              sessionToken=self.__session__,
              keyManagerToken=self.__keymngr__,
              sid=stream_id,
              since=since_epoch
          ).result()
          self.logger.debug('%s: %s' % (status_code, response))
          return status_code, responsf read_stream(self, stream_id, since_epoch):
          ''' get datafeed '''
          response, status_code = self.__agent__.Messages.get_v4_stream_sid_message(
              sessionToken=self.__session__,
              keyManagerToken=self.__keymngr__,
              sid=stream_id,
              since=since_epoch
          ).result()
          self.logger.debug('%s: %s' % (status_code, response))
          return status_code, response
docs: get datafeed