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I know you arent interested in link port, but a long time ago I asked the dev to explain how sync works over tcpip, in case someone wanted to hack some midi sync into BGB using maxmsp network objects or something, so Ill copy pastah this for the web.

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)

Carpet DMG?