make
./gop2p server
./gop2p client -t A -a <ip of server>
./gop2p client -t B -a <ip of server>
After the p2p connection is built, the server will exit. The two client will send a random int [0,100) to each other
Note
the default is my vps' ip
ref: https://blog.nowcoder.net/n/4cd4fd71452c40c18cdfeb92383117e5