Problem in communication of wireless communication with rn 171

import java.io.*;
import java.util.*;
import java.net.*;
//package udp_server;

/**
 *
 * @author THV-JD
 */
public class Udp_server extends Thread
{
    public static void main(String args[])
{
        int receivePort=999; // port to receive datagrams from
        InetAddress remoteIPaddress; // IP address of remote host
        int remotePort; // port on remote host to send frames too
        byte[] buffer = new byte[65507]; // array to put datagrams in
        DatagramPacket dp = new DatagramPacket(buffer, buffer.length); // create packet for datagrams
        try
              {
              // open DatagramSocket to receive and a DatagramePacket to hold the datagrams
              DatagramSocket ds = new DatagramSocket(receivePort);
              // loop forever reading datagrams from the DatagramSocket
              while (true)
                {
                 ds.receive(dp); // wait for next datagram
                 byte[] data = dp.getData(); // get datagram contents
                 String s = new String(data, 0, dp.getLength()); // create a string from the data
                 System.out.println("\nFrom IP " + dp.getAddress() + " UDP string received " + s + "\n");
                }
              }
        catch (IOException se) {System.err.println("error " + se);}
        System.exit(1); // exit on failure
}
}

scan
set wlan host roving1
join
get ip
set ip host
set ip remote
set ip local