MulticastSocketServer

import java.io.IOException;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.Inet4Address;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.Enumeration;

// http://examples.javacodegeeks.com/core-java/net/multicastsocket-net/java-net-multicastsocket-example/
public class MulticastSocketServer {

    final static String INET_ADDR = "224.0.0.3";
    final static int PORT = 8888;

    public static void main(String[] args) throws UnknownHostException,
            InterruptedException, SocketException {
        // Get the address that we are going to connect to.
        InetAddress addr = InetAddress.getByName(INET_ADDR);

        String streamIP = "";
        // http://stackoverflow.com/a/7541175/1974494
        NetworkInterface ni = NetworkInterface.getByName("eth0");
        Enumeration<InetAddress> inetAddresses = ni.getInetAddresses();
        while (inetAddresses.hasMoreElements()) {
            InetAddress ia = inetAddresses.nextElement();
            if (!ia.isLinkLocalAddress()) {
                System.out.println("IP: " + ia.getHostAddress());
                streamIP = ia.getHostAddress();
            }
        }

        int i=0;
        // Open a new DatagramSocket, which will be used to send the data.
        try (DatagramSocket serverSocket = new DatagramSocket()) {
            while (true) {
                String msg = "udp://" + streamIP + ":1234";

                // Create a packet that will contain the data
                // (in the form of bytes) and send it.
                DatagramPacket msgPacket = new DatagramPacket(msg.getBytes(),
                        msg.getBytes().length, addr, PORT);
                serverSocket.send(msgPacket);

                System.out.println("Server sent packet " +i+ " with msg: " + msg);
                i++;
                Thread.sleep(1000);
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        }
    }

}