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