UDPServer.java

import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.net.DatagramPacket;
import java.net.DatagramSocket;
import java.net.InetAddress;
import javax.imageio.ImageIO;

public class UDPServer {

	private final static int port = 9999;
	
	public static void main(String[] args) throws Exception {
		
		BufferedImage img = ImageIO.read(new File("img.jpg"));
		ByteArrayOutputStream baos = new ByteArrayOutputStream();        
		
		ImageIO.write(img, "jpg", baos);
		baos.flush();
		
		byte[] buffer = baos.toByteArray();

		DatagramSocket serverSocket = new DatagramSocket();       
		InetAddress IPAddress = InetAddress.getLocalHost(); // Change LocalHost to your specific broadcast group
		//InetAddress ip = InetAddress.getByName("192.168.9.0"); //Last Byte of IP will be zero for Broadcasting (Generally)
		
		DatagramPacket packet = new DatagramPacket(buffer, buffer.length, IPAddress, port);
		serverSocket.send(packet);
		
	}
	
}