/*
** Objektorienteeritud programmeerimine - datagrammiserver.
**
** NB! Tegemist on õppeotstarbelise näitega, mis ei ole 
** mõeldud reaalses elus kasutamiseks.
**
** @author	Gunnar Kudrjavets [gk@aprote.ee]
** @version	0.1, 04.13.1999
** @since	JDK 1.0
*/

import java.io.*;
import java.net.*;

public class Pulse {
	public static void main(String argv[]) throws IOException {
		
		final int iPackSize = 1024;
		
		if (argv.length == 1) {
			DatagramSocket s = new DatagramSocket(Integer.parseInt(argv[0]));
			while (true) {
				DatagramPacket packet = new DatagramPacket(new byte[iPackSize], iPackSize);
				s.receive(packet);
				String message = new String(packet.getData(), 0, 0, packet.getLength());
				System.out.println("Heartbeat from: " + packet.getAddress().getHostName() + " - " + message);
			}
		} else {
			System.out.println("I need only one thing - port number!");
		}
	}
}