Hello @Londoner200W ,
Thank you for your question. In the Developer Portal API Documentation, there is a list of features that are available via API: https://developer.viessmann.com/en/doc/iot/data-points. There are also features for the supply temperature available. Please have a look over there.
Unfortunately I cannot support you on the configuration of the yaml / the Home Assistant plugin that you are using. You would need to address this directly to the developer of the plugin.
In general, the ViCare app and the public API have different set of features that are provided. Not every feature that is available in the ViCare app necessarily have to be available in public API.
I hope this helps.
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