The writing of this application prompted me to check the status of the window in the greenhouse at the cottage, the temperature in the room, the status of the LEDs on the oil heater control panel, weather conditions outside the window, and also to know if the mice are running at night on tables and on sofas (it's time to arrange glue traps or not). That is, security, safety and security. Nobody wants to burn half the street in the village, just because he left the oil heater on full power. If you put the phone in the most prominent place in the middle of the room, so that the front camera was aimed at the weather station screen, and the back camera on furniture and on the street, then all the above requirements can be fulfilled if you take a photo and upload it via email or FTP. It is clear that this is a one-way connection and one can only analyze the incoming information, but nevertheless this is also useful information, because you can call neighbors to run and check what's happened. And all that is needed is an old phone on Android.

1. Observation of the gas boiler.
2. Monitoring the state of the electrical network (sends SMS if the voltage is gone 220V).
3. Monitoring the condition of electrical appliances.
4. Temperature outside and inside the room.
5. Change the control parameters via SMS.
6. Send status reports to e-mail or FTP.
7. Works on all Android, starting with 2.3.
8. Careful of battery charge.
9. The level of the GSM signal.
10. The level of charge of the telephone battery.
11. Saving Internet traffic.

All the sources of Fotobot (working project Android Studio) are located here:

https://github.com/andreiyv/Fotobot

Detailed documentation:
https://andreyv.ru/fotobot

Screenshots: