import java.net.DatagramPacket;
import java.net.DatagramSocket;


public class UDPServer
{
    public static void main(String args[])
    {
        // receive data sent to port 1027
        int port = 1027;

        // receives a byte array of size 1 (for demonstration)
        int size = 1;
        byte[] data = new byte[size];
        DatagramPacket packet = new DatagramPacket(data, size);

        try
        {
            DatagramSocket udp_service = new DatagramSocket(port);
            
            while (true)
            {
                System.out.println("Waiting for a packet ...");
                udp_service.receive(packet);
                System.out.println("Received: " + data[0]);
            }
        }
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}