StopWaitClient.java

import java.net.*;

public class StopWaitClient {
    public static void main(String[] args) throws Exception {
        DatagramSocket ds = new DatagramSocket();
        ds.setSoTimeout(2000);
        
        for (int i = 0; i < 5; i++) {
            byte[] data = ("Frame" + i).getBytes();
            
            while (true) {
                System.out.println("Send: Frame" + i);
                ds.send(new DatagramPacket(data, data.length, InetAddress.getByName("localhost"), 9090));
                
                try {
                    byte[] buf = new byte[1024];
                    DatagramPacket dp = new DatagramPacket(buf, buf.length);
                    ds.receive(dp);
                    System.out.println("Got: " + new String(dp.getData(), 0, dp.getLength()) + "\n");
                    break;
                } catch (SocketTimeoutException e) {
                    System.out.println("Timeout! Retry...\n");
                }
            }
        }
        ds.close();
    }
}