Problem with refresh token request

[martmey238]

Hello,

I'm trying to implement the Viessmann API into my Openhab3 environment.

I read the documentation carefully and all steps until the "refresh token request" worked very well.

My challenge now is that the refresh token call does not work.

This is the call I'm trying:

curl -X POST "https://iam.viessmann.com/idp/v2/token" -H "Content-Type: application/x-www-form-urlencoded" -d "grant_type=refresh_token&client_id=07...&refresh_token=XX_x..."

I always get {"error":"invalid-token-request"} as response, but I can't find the mistake as the call is exactly as described.

Can you help me, please?

Thanks a Lot.

[MichaelHanna · Accepted solution]

Hi @martmey238 ,

The call you are trying should be correct. Please make sure that your client_id and your refresh_token are valid. Maybe it helps to create a new refresh token. If the refresh token is invalid, you get exactly the error you are describing.

https://developer.viessmann.com/en/doc/authentication (Section: Refreshing an access token)

Let me know if this helps.

Best,

Michael

[martmey238 · Accepted solution]

Hello Michael,

I've clicked the wrong button. The topic is unfortunately not resolved.

I've retried the whole procedure and ended again with the same "invalid-token-request" message.

Any idea what I can do, please?

Thanks a Lot.

Martin