When
Matter devices reboot—whether due to firmware updates, power loss, or network
resets—you may notice that some of your IFTTT webhook automations stop working
temporarily. Although IFTTT webhooks operate independently from local
smart-home protocols, Matter’s behavior during a reboot can indirectly
interrupt the automation chain. Here are the main reasons behind the issue and
what you can do to fix it.
1. Matter Devices Lose IP Connectivity During Reboot
Matter
runs over IP (Thread, Wi-Fi, or Ethernet).
When a Matter device restarts, it briefly loses its assigned IPv6 address or
Thread mesh link. If your IFTTT webhook depends on a Home Assistant,
SmartThings, or Hubitat event triggered by that device, the event will not fire
because:
- The hub cannot
reach the device’s endpoint.
- The device doesn’t
send state updates until full reconnection.
- The automation
engine marks the device as unavailable.
As
a result, the webhook URL is never executed.
Fix:
Ensure your Matter devices connect to a stable network and avoid power-cycling
them during critical routine times.
2. Delayed State Synchronization After Reboot
Matter
devices often take several seconds—or even minutes—to:
- Rejoin the Thread
mesh
- Sync attributes
(battery, occupancy, temperature, etc.)
- Rebuild secure
sessions with the ecosystem controller
If
your automation is triggered immediately after the reboot, the controller may
still see the device as “offline,” causing the IFTTT webhook not to run.
Fix:
Add a short delay (5–15 seconds) in your IFTTT trigger chain or smart-home
automation to ensure the device is fully online before actions are executed.
3. Controllers Temporarily Pause Event Broadcasting
Platforms
like Home Assistant, SmartThings, and Google Home sometimes pause event
broadcasting for devices that recently rebooted. This prevents invalid or
partial events from triggering automations but also blocks IFTTT webhooks
momentarily.
Fix:
Check your controller’s logs and update the hub firmware to the latest version
to reduce event delays.
4. Thread Border Router Congestion Interrupts External Calls
If
your Matter device uses Thread, a reboot causes the border router to reassign
routing paths. During this period:
- Packet forwarding
may stall
- DNS resolution can
slow down
- Cloud-linked
events (like webhooks) may queue or fail
This
often results in missed or delayed webhook triggers.
Fix:
Use a dedicated, modern Thread border router (Apple TV 4K, Nest Hub, HomePod
Mini) to avoid congestion.
5. Cloud Handshake Failure With IFTTT Services
If
your automation relies on a cloud-to-cloud integration (e.g., SmartThings →
IFTTT), the Matter device’s temporary offline state can disrupt the cloud
handshake, preventing the webhook call.
Fix:
Reconnect the affected device in your smart-home app and re-enable the IFTTT
service link if necessary.
Conclusion
IFTTT
webhooks stop working when Matter devices reboot because the reboot disrupts
the device’s IP presence, state synchronization, and cloud event broadcasting.
While the issue is usually temporary, you can minimize disruptions by improving
network stability, updating controller firmware, and adding slight trigger
delays.