Thank you, Fernando, and kratmel, for your advice on controller selection. I have taken Joe T's suggestion and submitted a ticket to Unitronics Support. Haven't heard back yet, but will let you know the response. I do have operational considerations that would make mobile phone access helpful and am beginning to elevate such a feature in my selection criteria.
I find Ausman's "lift from the app guide" very interesting. It discusses "minimum" OS version Android 4.0+, which would seem to imply that any versions higher would be supported. My Samsung Galaxy S22 says my "One UI version" is 5.1. My phone recently began calling its updates: "UI updates". I'm thinking Android may have introduced a significant software change recently. I'm wondering if One UI 5.1 is a follow on to Android 4.0? My phone additionally say "Android version: 13" - for whatever that's worth.
Ausman: I have searched but have not been able to locate at the Unitronics website, the "app guide" you referenced . Could you provide a link or navigation to locate the guide you are referring . I would like to study it further.
Thanks, All.