docs: async def async_get_bytes_total(self, use_cache=True):
          """Retrieve total bytes (rx an tx) from ASUSWRT."""
          now = datetime.utcnow()
          if use_cache and self._trans_cache_timer and self._cache_time > \
                  (now - self._trans_cache_timer).total_seconds():
              return self._transfer_rates_cache
  
          rx = await self.async_get_rx()
          tx = await self.async_get_tx()
          return rx, tx