final void init() throws IOException {
    	receivingSocket = new MulticastSocket(4446);
        multicastAddre = InetAddress.getByName("230.0.0.1");
        receivingSocket.joinGroup(multicastAddre);
        receiverThread = new MulticastReceiverThread();
        
        sendSocket = new MulticastSocket(4446);
        sendSocket.joinGroup(multicastAddre);

        receiverThread.start();
        
     }