As promised, see below an example on how to control the Google Device node.
The Google Device node will be the future for this application and it will replace the Google Thermostat node.
On the left side you see, what you have to Inject in order to control the node.
Be aware that if you try to Inject a value for thermostatTemperatureSetpoint, the value is not correctly indicated under the node.
See: Google Device node Thermostat setting · Issue #214 · mikejac/node-red-contrib-google-smarthome · GitHub
If you control this node, either with your voice or by changing the set-point or mode you will see at the output of the node the following:
With this data and some other Node RED nodes it is quite easy to control the thermostats.
Another thing you should know is that the mode "Auto", which is supported by Google is not correctly indicated in the Google Home app. It is indicated as "Other". This mode cannot be selected in the Google Home app.
The complete test flow, you will find below:
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Regards
