import java.net.*;
import java.io.*;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class rs232c_Applet 
    extends Applet implements ActionListener
{
    Button btnRTS;
    Button btnDTR;
    Button btnCLR;
    OutputStream sout;
    String host;

    public void init()
    {
	setLayout(new GridLayout(1,0,20,0));
	btnRTS=new Button("RTS");
	btnDTR=new Button("DTR");
	btnCLR=new Button("CLR");
	btnRTS.setBackground(Color.green);
	btnDTR.setBackground(Color.green);
	btnRTS.addActionListener(this);
	btnDTR.addActionListener(this);
	btnCLR.addActionListener(this);
	add(btnRTS);
	add(btnDTR);
	add(btnCLR);
	host=getCodeBase().getHost();
	if(host=="") host="localhost";
    }

    void request(char data)
    {
	try {
	    Socket sock=new Socket(host,2100);
	    sout=sock.getOutputStream();
	    sout.write(data);
	    sout.close();
	    sock.close();
	} catch(Exception ex) {
	    System.out.println(ex);
	}
    }

    public void actionPerformed(ActionEvent ev)
    {
	if(ev.getSource() instanceof Button)
	{
	    Button btn=(Button)ev.getSource();
	    if(btn==btnRTS)
	    {
		btnRTS.setBackground(Color.red);
		btnDTR.setBackground(Color.green);
		request((char)2);
	    }
	    if(btn==btnDTR)
	    {
		btnRTS.setBackground(Color.green);
		btnDTR.setBackground(Color.red);
		request((char)1);
	    }
	    if(btn==btnCLR)
	    {
		btnRTS.setBackground(Color.green);
		btnDTR.setBackground(Color.green);
		request((char)0);
	    }
	}
    }
}