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GfxTablet/doc/protocol.txt

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Network protocol used by GfxTablet
Version 2
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GfxTablet app sends UDP packets to port 40118 of the destination host.
Packet structure, uses network byte order (big endian):
9 bytes "GfxTablet"
1 unsigned int16 version number
1 byte event type:
0: motion event (hovering)
1: button event (finger, pen etc. touches surface)
1 unsigned int16 x (using full range: 0..65535)
1 unsigned int16 y (using full range: 0..65535)
1 unsigned int16 pressure (accepting full range 0..65535, but will clip to 32768 == pressure 1.0f on Android device)
when type == button event:
1 signed int8 number of button, starting with 0
1 byte button status:
0 button is released ("up")
1 button is pressed ("down")