def del_device_notification(adr, notification_handle, user_handle):<EOL>
if port is not None:<EOL><INDENT>return adsSyncDelDeviceNotificationReqEx(<EOL>port, adr, notification_handle, user_handle<EOL>)<EOL><DEDENT>
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