LEJOS - server for telnet

import java.net.*;
import lejos.hardware.Button;
import lejos.hardware.lcd.LCD;
import lejos.hardware.port.SensorPort;
import lejos.hardware.sensor.EV3ColorSensor;
import lejos.hardware.sensor.EV3UltrasonicSensor;
import lejos.hardware.sensor.SensorMode;
import lejos.hardware.sensor.SensorModes;
import lejos.robotics.SampleProvider;
import lejos.utility.Delay;
import java.io.*;

public class Hlavni {
    public static void main(String[] args) {
        PrintStream os;
        InputStream is;
        ServerSocket ss;
        Socket s;
        byte init[] = { (byte) 0xff, (byte) 0xfb, (byte) 0x01, (byte) 0xff, (byte) 0xfb, (byte) 0x03, (byte) 0xff,
                (byte) 0xfd, (byte) 0x0f3 };
        System.out.println("Cekam na spojeni...");
        try {
            ss = new ServerSocket(9999);
            s = ss.accept();
            os = new PrintStream(s.getOutputStream());
            os.write(init);
            is = s.getInputStream();
            char znak=0;
            do {
                znak=(char)is.read();
                LCD.drawString(""+znak, 0, 2);
            } while (znak!=-1);
            s.close();
        } catch (Exception e) {
                LCD.drawString("Exception = Konec...", 0, 3);
        }
    }
}