Hello Mirek, are you aware of the new "bridge" Phil developed? https://community.viessmann.de/t5/Konnektivitaet/Optolink-Switch-Splitter-Vitoconnect-MQTT-amp-TCP-IP/td-p/439982 Here you can communicate directly with the vitocal using MQTT, without VM cloud and the limitations of Api. Vitoconnect can run in parallel. BR Michael
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