Detects when USB device is connected
Enumerates USB devices in OnCreate
Uses UsbSerialLibrary. Next fix permissions.
Implements permissions button
Makes permissionbutton show sensible texts.
LICENSE
Adds controls for Arduino
Opens serial connection with Arduino
Bugfixes and code clarification
Implements a unique routine for detecting buttonclicks.
Communicates simple messages, both read/write
Android sends commands to Arduino. Arduino receives and obeys.
Four outputs.

2 digital (pins 2,4) + 2 PWMs (pins 3,5)
SeekBar updates in separate Thread. Restarts connection in case of
failure.
Arduino writes pin values when requested by GV{XX} message.
Reads commands from Arduino, but does not obey them yet.
A0 button works with Handler
All inputs and outputs.

Sometimes transmitted characters are lost and sometimes sending messages
to Arduino fails.
Increase baud rate. Test pushing.