code: def del_device_notification(self, notification_handle, user_handle):
          # type: (int, int) -> None
          
          if self._port is not None:
              adsSyncDelDeviceNotificationReqEx(
                  self._port, self._adr, notification_handle, user_handle
              )
docs: Remove a device notification.
  
          :param notification_handle: address of the variable that contains
              the handle of the notification
          :param user_handle: user handle