ping-pong is a sctp example that shows how you can send/recv messages. In this example, there are 2 types of peers: ping and pong.
Ping will always send ping <seq_number> messages to pong and receive pong <seq_number> messages from pong.
Pong will always receive ping <seq_number> from ping and send pong <seq_number> messages to ping.
make./pong./ping