code: def del_device_notification(adr, notification_handle, user_handle):
      # type: (AmsAddr, int, int) -> None
      
      if port is not None:
          return adsSyncDelDeviceNotificationReqEx(
              port, adr, notification_handle, user_handle
          )
docs: Remove a device notification.
  
      :param pyads.structs.AmsAddr adr: AMS Address associated with the routing
          entry which is to be removed from the router.
      :param notification_handle: address of the variable that contains
          the handle of the notification
      :param user_handle: user handle