It's the "external user" use case, and a case of the over-complicators gloves... instead of changing the 9v battery in that box every "$N" years, put a QR code

It's the "external user" use case, and a case of the over-complicators gloves... instead of changing the 9v battery in that box every "$N" years, put a QR code up that gives you the regular pin pad thing and then triggers HA in the back end. (that's why I suggested "IFTTT" integration). Obviously there's 100's of easier ways to manage things which is why I haven't done anything on it yet. It just seemed like an adjacent use-case worth sharing to the creator. I'm not wiring up a "doorbell" to my back garage, but popping an "approve/deny" thing that eventually hits an API endpoint or IFTTT integration (with geo-location?) isn't that far off from what he has and is an entirely different value-prop of utility.