I ran a test last weekend with real food. The controller performed well enough--the only problem was that it lost the connection with the Android twice during a ten-hour cook. I'll have to put in keep-alive logic at some point.
I'm in the process of writing up a schematic. This will take a little time because I have to learn KiCad on the fly. I also need to figure out the best way for you to install the app on your phones. I don't know what the process is for getting an app added to the Google store or if there's another way.
I'm on vacation for the next two weeks so there won't be much until after then.