Google Cloud Messaging not working

[andrhrstv]

Hello forum,

I've been using the Google Cloud Messaging for years now and yesterday it just stopped working. I get this error in the log when i try to send a notification to my Android phones:

2025-12-20 00:20:13.712 Error: FCM: Unable to get access token!
2025-12-20 00:20:13.712 Notification sent (fcm) => Failed
2025-12-20 00:20:13.718 Active notification Subsystems: fcm (1/13)

Any ideas what might had happen or how to fix that? The Domoticz GCM notification system is not documented at all.

About my Domoticz
Version: 2025.1
Build Hash: 89d5c900d
Compile Date: 2025-05-05 10:02:49
dzVents Version: 3.1.8
Python Version: 3.11.2 (main, Apr 28 2025, 14:11:48) [GCC 12.2.0]

Uptime: 1 Days, 2 Hours, 24 Minutes, 15 Seconds

[dobber]

Same problem here.

Domoticz 25.2 16997

Must be a general error with domoticz. Expired key etc with google cloud.

[vipkoza]

Same issue here

Code: Select all

 2025-12-24 12:27:06.719 Status: Notification: Domoticz test
2025-12-24 12:27:07.472 Error: FCM: Unable to get access token!
2025-12-24 12:27:07.472 Notification sent (fcm) => Failed 

Version: 2025.2
Build Hash: e63981b18
Compile Date: 2025-10-13 11:42:57

[elgringo]

Since last week I dont get any FCM messages anymore.

Logging reports:
FCM: Unable to get access token!

I removed all mobile devices and readded them. Same problem

Running on a Pi 5, bookworm, 2025.2 in a docker container

[bboy19]

The same for me. I'm not able to recieve push notification on mobile app. Anyone can help?

[waltervl]

Seems to be some general issue here since 18 or 19 december viewtopic.php?p=330271#p330271

[electrofunk]

Hi,
Same problem here with Domoticz 2024.6 and 2024.7.
Hopefully, the fix of this problem does not impose to install a newer version of Domoticz because 2024.6/7 are the last versions working on bullseye/OpenSSLv1. Problem with newer versions of Domoticz is that they impose bookworm/OpenSSLv3 and new GPIO management, so a lot of upgrade work
Thanks for your help.

[waltervl]

Could also be an issue on the Android App side as that should receive the notification...

[electrofunk]

Just to give more detail in my case:

Debug Log in Domoticz:

Debug: FCM: Requesting AccessToken (grant_type=urn%3Aietf%3Aparams%3Aoauth%3Agrant-type%3Ajwt-bearer&assertion=<base64 encoded assertion>)
Debug: FCM: Failed to retrieve AccessToken, JSON Error! ({"error":"invalid_grant","error_description":"Invalid JWT Signature."})
Error: FCM: Unable to get access token! Notification sent (fcm) => Failed

The Domoticz mobile App I'm using is this one: https://play.google.com/store/apps/deta ... s.domoticz

[waltervl]

I merged the FCM message error topic into this topic as it is the same issue.

There is also a Github issue created as it seems Google revoked to API key to send messages. So this will be a major overhaul to get this up and running again.
https://github.com/domoticz/domoticz/issues/6492

[PeJeWe]

Same here
Version: 2025.2
Build Hash: e63981b

Code: Select all

Error: FCM: Unable to get access token!

[waltervl]

Yes, and it will not be easy to fix it.....

[PeJeWe]

Is there any simple alternative without installing an app?

[waltervl]

The issue has been solved in Domoticz latest beta and the updated app thanks to galadril and gizmocuz.

To receive notifications from Domoticz server with the Android Domoticz app you need to setup a project. For this got to wiki page Firebase setup https://wiki.domoticz.com/Firebase_setup

[pfloryann]

This fix is very good and works, but maybe it should be temporary because not all users have the technical skills to implement from firebase console to domoticz and then to the app. That's why I think a simpler option should be found in the future, like it was before but which works now.

[waltervl]

Unfortunatly this is the only way to do this. We cannot store a Firebase API key in the Domoticz public repository as Google will disable that key (as it did before). The way it is implemented now is the only way for an open source server application sending notifications to an Android App.