Vala networking packets in DataInputStream

Question

I've been playing around with networking in Vala but I can't find any documentation on how to read a signal packet or tell when one packet ends and another one starts in the incoming data stream.

Here is my code so far:

bool on_incoming_connection (SocketService socket, SocketConnection conn, Object? unuesd) {
    stdout.printf ("Got incoming connection\n");
    // Process the request asynchronously
    process_request.begin (conn, socket);
    return true;
}

async void process_request (SocketConnection conn, SocketService socket) {
    try {
        var dis = new DataInputStream (conn.input_stream);
        var dos = new DataOutputStream (conn.output_stream);

        uint8 byte = 0;

        do {
            byte = dis.read_byte();
            stdout.printf ("Got: %d\n", byte);
        } while (byte != 0);


        // The connection is automatically closed because conn is destroyed upon function return.
    } catch (Error e) {
        stderr.printf ("%s\n", e.message);
    }
}

void main () {
    MainLoop loop = new MainLoop ();
    
    var service = new SocketService ();

    Cancellable cancellable = new Cancellable ();
    cancellable.cancelled.connect (() => {
        service.stop ();
        loop.quit ();
    });

    try {
        service.add_inet_port (33333, null);
    } catch (Error e) {
        stderr.printf ("%s\n", e.message);
    }
    
    service.incoming.connect (on_incoming_connection);
    service.start ();
    loop.run ();
}