I'm listening to a port with the following terminal command
while true; do nc -k -l -p pppp -s xx.xxx.xx.xx; done
where pppp is my port and xx ... is the IP.
I do not remember how to send a message to that IP with that port, in order to "hear" it or see it from the server side, I thought it was with nmap but it seems that it does not.
Can you help me remember it?