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be warned that GB link in BGB is messy, nothing is guaranteed, YMMV.

4 byte commands are sent over tcp connection, which can either do game link or remote controller.
TCP-correctly, you can send bigger TCP packets with multiple 4-byte commands if desired.

BGB does a "link frame" 1024 times per second (the time needed to send 8 bits in slow link mode).
it then sends data if the GB code was sending as master, and it replies if it received something and is slave.

a real GB can either be put in master mode or slave mode by the GB code.

offset    size    desc

0    1    b1 (command number)
1    1    b2
2    1    b3
3    1    b4

command number:

value    name            desc

1    linkcmd_version       
    queries link version of remote side. this only changes if the link compatibility is changed.
    currently: b2=0, b3=85, b4=1

101    linkcmd_joypad
    remote control joypad. the receiving side executes or ignores this based on setting.
    bits of b2:
    bits 0-3 (low 4 bits) are the button number
    bits 4 is on/off state
    bits 5-7 must be 0.

104    linkcmd_sync1
    send link byte as master
    b2 = SB register
    b3 = SC register
    b4 = low 8 bits of link frame counter

105    linkcmd_sync2
    send link byte as slave (in response to master).
   

107    linkcmd_linkspeed
    b2 = speed shift value. sets link frame to happen 2^(b2) times per second, default is 10 (1024 Hz)

Where's da farking live stream btw? Don't tell me there isn't one...