My Ecobee thermostat can be used as a motion sensor in RM, so make a rule in RM to do something on motion. I do use the the Ecobee suite from @storageanarchy. You can install it from Hubitat package manager which makes it fairly easy, but if you don't want to, then the stock driver should work.
I have never used the stock driver but I would assume it would allow you to use the motion sensor in the thermostat as well.
