@MartinBruening, I used the Viessmann.Parameter.Adresses.xlsx already. What is the url of " the database of the Vitosoft program"? And where can I find the poll_list. py script (+ instructions). My setup is abt. the same as of FransOv , but without the office ("kantoor"). I don't know if I have a mixing valve. How does it look like? diagram optolink-bridge.jpg
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