Google Calendar Scheduler no longer working

Add-ons Other
1

I have been using the Google Calendar Scheduler (https://www.openhab.org/addons/integrations/gcal/) for over a year with great succes.

A few weeks ago, it started throwing errors:

2020-03-14 14:54:02.521 [INFO ] [b.core.service.AbstractActiveService] - Google Calendar Event Downloader has been started
2020-03-14 14:54:02.527 [DEBUG] [openhab.io.gcal.auth.GCalGoogleOAuth] - Loaded credential
2020-03-14 14:54:02.528 [DEBUG] [openhab.io.gcal.auth.GCalGoogleOAuth] - device access token: null
2020-03-14 14:54:02.530 [DEBUG] [openhab.io.gcal.auth.GCalGoogleOAuth] - device refresh_token: 1//09ikvUL_...etc
2020-03-14 14:54:02.531 [DEBUG] [openhab.io.gcal.auth.GCalGoogleOAuth] - device expires_in: null
2020-03-14 14:54:03.090 [ERROR] [openhab.io.gcal.auth.GCalGoogleOAuth] - authentication failed: 400 Bad Request
{
  "error" : "invalid_grant",
  "error_description" : "Bad Request"
}

I reinstalled the binding, I checked if my Raspberry had no time sync issues, created a new client id + secret, nothing helps.

My services config:

client_id=10---6049475-4ltkm18qc7lit-----
client_secret=uOw7Eg----
calendar_name=Trash

It seems strange to me that the access token is null, should this be the case?

2

Have you updated OH lately or this just started on it’s own? What version of OH are you using?

Have you tried stopping OH, cleaning the cache and restarting a few times since creating a new client ID?

3

I have been on 2.5 since that was released, was on beta 2 before that. The last time it worked, as far as I can see was 18 February. I was migrated long before that so it did work with 2.5. I have tried rebooting OH, that didn’t help. Are you also using the binding and if so, what are you seeing as a value for the acces_token, is that null?

4

Did you also try cleaning the cache? FYI, it’s been posted several times in the forum that since 2.5 restarting OH several times is needed. For me it usually takes 2 restarts before things start working correctly.

I am not using this binding.

5

I rebooted a couple of times but didn’t help. I will also try to clear the cache, and if that doesn’t work I will use the other caldev binding.

6

So, when scrolling through the documentation one last time, I suddenly saw:

If you later change your client_id and client_secret in the configuration, you will have to locate and delete the file gcal_oauth2_token, and stop and restart the service. This is because the Google Calendar Scheduler does not detect that the OAuth token is no longer valid. On openHAB 2.0.0 installed via apt-get, this file is located in the directory /var/lib/openhab2/gcal

Whenever the error occurred, I did not change my secret/id but 2 weeks ago I did to debug this issue. So I removed the file and now it works again!