How to use the netplay-lobby-server-go project on GitHub

The official game lobby at

is very slow for netplay, so I want to set up a local game lobby to play with friends. I’ve successfully deployed it, but I don’t know how to use it. Could anyone kindly provide guidance? Thank you very much!

The address of my deployed lobby is: http://38.22.92.104:7777/

How can I connect RetroArch to this lobby for gaming? Please provide some advice.