And guess what - I might even do the hardware for it... cos even as it stands, your app could be great for me to use with my ambulance to camper conversion, which has a mind of its own and keeps central-locking by itself.
I posted in Hardware last night about a low voltage ESP relay board which seems suitable for 12v vehicle use - well I already ordered a couple, and it seems that with your app it might be easy to do authenticated central-unlocking of the camper from the phone, as well as knowing the interior temp. And I can think of a few other useful things to be monitoring and controlling for it by phone, such as turning off the lights and TV without getting out of bed, and receiving outside activity PIR alert alarms during the night (we were gassed and robbed once, it aint gonna happen again).
It gives me great encouragement to get my 'bag of bits' working, cos that should offer all the networked hardware control side of things, and I am now really optimistic about B4A having potential to create a very decent front end user interface for it all. Your app already adds keyboard authentication security, and shows it's possible to display any data being monitored, so I doubt it's any problem to display as many open/closed door and on/off lamp icons etc as are needed, and presumably it's possible to have different control pages for different areas etc.
If B4A gives access to the phones resources it may even be possible to add location-based authentication - perhaps using GPS coordinates or proximity to paired bluetooth devices etc - so that you'd only need to enter keyboard security authentication if you were 'out of bounds'.
I'm really looking forward to getting my bag of bits assembled into something usable and seeing how far ESP_Basic can be coaxed out into the real world.