Well, I’ve given up on waiting for ST to finish this integration. I was at least able to get some control using the Stringify app after adding the Lyric T5 and ST as “things”. It won’t let me read the current temp from the thermostat but it does let me set the mode to Off/Heat/Cool, set temp, fan mode, etc based on various states and conditions within ST (for some reason, virtual switches don’t work with Stringify, go figure). Stringify seems to consume an unusally large amount of battery power on my phone, but at least it’s a working solution.
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