So, I want to build an app that will track current position of Raspberry module in real-time. Raspberry location will be displayed at google map and updated every 3 seconds. I plan to buy HAT GSM module to connect raspberry to the Internet, because I want this module to send data (GPS location) to an android app.
Is there anyone experienced with this subject? My main question is - how do i establish connection to Raspberry Pi module in Android Studio, while creating app?