I understand that when Vitogate is in use, VitoConnect cannot be used. So this would not be a feasible solution and also having another device to connect while VitoConnect is readily available would complicate things. I am pretty sure most people using Viessmann API are home users that only want to expose their heating system to HomeKit or those that would like to gather historical data to optimize their system. Viessmann API is unfortunately cumbersome and prone to errors and rate limits while doing this. While I understand that it is completely cloud based at the moment, I am pretty sure the device would be able to handle a simple local http query without any authentication, that would just serve a json result like the API. Hope you will consider this in a future update. This will decrease the load substantially on the API and let us use our devices much more efficiently.
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