Nest Integration has stopped working

Third party integrations
1

I set up the integration with Nest Thermostats a few months ago. It was all working fine until I check recently and it was no longer working. Unfortunately I failed to keep a log of what the original error was (possibly project not found?). I decided to remove the integration and go through the process again.

All worked fine until I got to the Device Access console section, adding the new project. When I added the OAuth client ID and then tried to enable events, the project would fail to create. I could create it without enabling events, and then when trying to enable pub/sub topic from within the project, I would get “could not update project data”. The required scopes there shows “https://www.googleapis.com/auth/sdm.service”. I tried adding this in the Google console but it requires verification from Google as it is a sensitive scope. So far they have not approved this.

Any thoughts? I’m assuming something has changed? Any other methods of adding Nest Thermostats? I was looking at Homebridge…

Thanks!

2

I had to go through redoing mine - once a while back. Why did you have to add a new project in google? Wasn’t it already in there from before?

3

I’m having the same issue as well. Had an existing device access project, but it does not have the events enabled, trying to enable them results in error reporting a internal server error in the response (shown below). It is not apparent why that error occurs though. Seems like Google may want to lock this down or something.

{
  "error": {
    "code": 500,
    "message": "Internal error encountered.",
    "status": "INTERNAL"
  }
}
1 Like
4

The project was there, but pub/sub had been disabled. Attempting to re-enable it failed, so I thought I’d try creating a new project.

1 Like
5

You’re not alone… I tried this today as well and getting the same. There is an issue logged with Google a LONG time. Suggest hitting the +1 to help drive urgency
https://issuetracker.google.com/issues/348675996

1 Like
6

I’m still getting a FAILED TO SETUP eror on Google Nest integration… I saw a lot of discussion on github that I did not understand… anyone know if I need to do sometthing or if a fix is coming in a patch?

7

Even when it does work, you will often have a long delay because of the extra hop of every interaction going through google servers. I am throwingf in the towel and getting an ecobee thermostat.

Tip: any smart thermostats you buy, try to but it through your power company - they may give a big discount!

8

this has also stop for me, I just updated OS to 15.1 and then discovered my google nest API as not working, so I have gone through the steps to make sure that all was find, and when I try to reconnect I get through to the “Choose your email address” and then it informs me " Can’t link to Nest-Home-Gen3
Please contact Nest-Home-Gen3 if the issue persists ".

9

Yes but even if you get it to work again then since it is 100% cloud based you will have occasional disconnection issues and there will also almost always be some kind of a delay. No offense but you a fighting a losing battleif you are tryhing to make it always work 100% of the time - not possible

10

yea. I have binned that project for the moment, as it is now the summertime and I have better things to do then hit a brickwall with this intergation. .

11

FWIW, realized this is also happening to my Nest v3 post HA update.

Debugging shows “Disconnected from event stream: NotFound error calling streaming iterator: 404 Resource not found (resource=home-assistant-xxxxxxxx”
But interestingly enough, when I just do a reload on the integration, it updates everything… So, something is really wonky.

12

But that’s how I got my Nest thermostat! :tired_face:

13

Agreed. I can reload and get data, but it seems to no longer update after that.

15

I came looking for input. Apparently the instructions for the Integration has changed since Jan 2025.

You need to look at it to create a topic and enable Pub/Sub on the Device Access Project portal. Instructions are all there. I just did it, and things “worked” on Google’s end. I’m waiting to see if that fixed it.

16

So, I figured my issue out - my pub/sub got nuked. I ‘think’ it’s because (probably after an update on HA) it stopped polling / using the pub/sub and went inactive; which then deleted after 31 days.

I recreated it using the logs to identify what my topic/subscription names were, but i guess in theory deleting/reconfiguring would have done the same.