Network discovery in Java using multicasting

Question

I\'m trying to make a client/server Java App. Both client and server will be running on the same wi-fi network. Server will be running on a specific port that client is awar

Answer 1

(1)server listens on a pre-arranged port

DatagramSocket s = new DatagramSocket(8888);
s.receive  //(1)
s.send     //(2)

(3)client sends a message to the port, on the broadcast IP, 255.255.255.255

DatagramSocket c = new DatagramSocket();
c.send(255.255.255.255:8888,msg)     //(3)
c.receive  //(4)

the client binds to a port too. we didn't specify it, so it's random chosen for us.

(3) will broadcast the message to all local machines, server at (1) receives message, with the client IP:port.

(2) server sends response message to client IP:port

(4) client gets the reponse message from server.