# Instant offline notification and mailing **URL:** https://forum.ewelink.cc/t/instant-offline-notification-and-mailing/31863 **Category:** Uncategorized **Tags:** web, app, advanced-plan **Created:** [April 29, 2024, 7:10pm UTC](https://forum.ewelink.cc/t/instant-offline-notification-and-mailing/31863 "2024-04-29T19:10:24Z") **Posts on this page:** 1 **Showing post:** 5
### Author: ![ward](https://dub1.discourse-cdn.com/flex005/user_avatar/forum.ewelink.cc/ward/32/10437_2.png) [@ward](https://forum.ewelink.cc/u/ward) #### Post date: [April 30, 2024, 6:50am UTC](https://forum.ewelink.cc/t/instant-offline-notification-and-mailing/31863/5 "2024-04-30T06:50:45Z")
It is because of the logic that how our system tells if a device is offline. Take a Zigbee device for example: It usually sends a status report to the gateway every hour. If the gateway misses one of these, you’ll get a warning that the device is offline. But remember, there’s an hour-long gap between these reports. Wi-Fi devices work similarly. If one keeps connecting and disconnecting or your router decides a channel switch, you’ll get flooded with notifications on your phone and our server. To avoid this, a preset duration is needed to confirm if it’s really unreachable. --- _[View the full topic](https://forum.ewelink.cc/t/instant-offline-notification-and-mailing/31863)._