import java.io.IOException;

import java.net.DatagramPacket;

import java.net.DatagramSocket;

import java.net.SocketException;

public class Recv {

public static void main(String[] args) {

if(args.length != 1) {

System.out.println("Please specify receive port");

System.out.println("Recv <port>");

System.exit(1);

}

int port = Integer.parseInt(args[0]);

recv(port);

}

public static void recv(int port) {

try {

byte[] buf = new byte[256];

DatagramSocket socket = new DatagramSocket(port);

DatagramPacket pack = new DatagramPacket(buf, buf.length);

System.out.println("Listening on UDP port 5555.");

System.out.println("Waiting for packets...");

socket.receive(pack);

// display response

String received = new String(pack.getData(), 0, pack.getLength());

System.out.println("Received: " + received);

socket.close();

} catch(SocketException e) {

e.printStackTrace();

} catch(IOException e) {

e.printStackTrace();

}

}

}