docs: def getByteStatistic(self, wanInterfaceId=1, timeout=1):
          """Execute GetTotalBytesSent&GetTotalBytesReceived actions to get WAN statistics.
  
          :param int wanInterfaceId: the id of the WAN device
          :param float timeout: the timeout to wait for the action to be executed
          :return: a tuple of two values, total bytes sent and total bytes received
          :rtype: list[int]
          """
          namespace = Wan.getServiceType("getByteStatistic") + str(wanInterfaceId)
          uri = self.getControlURL(namespace)
  
          results = self.execute(uri, namespace, "GetTotalBytesSent", timeout=timeout)
          results2 = self.execute(uri, namespace, "GetTotalBytesReceived", timeout=timeout)
  
          return [int(results["NewTotalBytesSent"]),
                  int(results2["NewTotalBytesReceived"])]