Here is a test application for MIT Appinventor 2 and a Arduino ESP32 Sketch for sending and receiving data via Blutooth LE. Note: the ESP32 can not send more than 20 Byte at once, currently
- Install the .apk file on your android Phone and start it.
- Compile the .ino file in Arduino and upload it to your ESP32.
- Open the Arduino Serial Monitor.
- Push the connect button, and connect the ESP32 <-> Andriod via BLE
- The ESP32 will automatically send a String once it is connected.
- you can push the LED-Buttons to send Data from Android to the ESP32