Hello, I am new on that forum, and only speak english. I am using Vitoconnect device and the API api.viessmann.io/estrella/rest/v2.0. This works pretty well. I would like to adjust by https PUT request the parameter "konf_niveau_rw" (datapointId=2875) when outdoor temperature range is changing . My ideal setting is '-7' on warm winter, and '-4' on cold periods. When the boiler displays '-7', reading this "konf_niveau_rw" with the API, it returns '248' (=-7+255). I can manage this conversion. I guess it refers to sign number issue. It is not possible to write the "konf_niveau_rw" : Putting '-7' returns "error": "INTERNAL_SERVER_ERROR", Putting '248' returns "error": "INTERNAL_SERVER_ERROR", Thanks to the experts who had provided this marvellous facility!
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