The app looks like it is from 5 years ago, but a very nice project anyway. How often do users with smart home lights use the app and how often do you use the app?
In other words is it worth it or is it just a nerdy thing, which is nice but not really needed.
Guess you have no idea with what apps you can make money :)
If you have a decent app and good pricing you can convert something between 1-5% of downloads to paying customers. With his audience and reach he can easily make real money. Probably not life changing, but still a few hundred bucks each month.