nmap/tests/ncat-protocol-sanity-test/clt.exp

#!/usr/bin/expect

set timeout 10

spawn ncat -4 --sctp localhost 6666

expect {
    eof { exit 2 }
    default { exit 1 }
    "ServerSend\r" { sleep 1; send -- "ClientSend\r" }
}
sleep 1
exit 0