To subscribe to the service, just send the message `hi` from your Morserino. The server will respond with ":hi" and the number of clients connected (1 means you're alone).
If a client is inactive for a certain time, it will be removed from the subscriber list. The server then send the message `:bye` to this client. You can also force the removal by sending the message `:bye`.
Additional notes:
- Currently **no** UDP packets are being sent to avoid NAT timeouts
- The number of clients is restricted (to avoid abuse)