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I'm working on a more generic solution via a local mini REST api instead of relying on home assistant and gateways between them. Very early stage but already used in my Domoticz. See https://github.com/ampscm/TadoLocal

The repository contains the service and a Domoticz plugin using the ...

Note that Tado is adding new usage limits to their cloud api.
Users that don't pay for the additional features will slowly move to a 100 api requests/day limit was announced.

On another forum hey explained that they are introducing this slowly over 6 months, reducing bit by bit... Currently ...