echoserver.java

Bluetooth echo demo , to connect an server with j2se !

import javax.bluetooth.*;
import javax.microedition.lcdui.*;
import javax.microedition.io.*;
import java.io.*;

public class EchoServer implements Runnable {    
  StreamConnectionNotifier notifier;
  StreamConnection conn;
  LocalDevice localDevice;
  ServiceRecord serviceRecord;
  InputStream input;
  OutputStream output;
  
  private boolean isInit;  
  private static String serverUrl = "btspp://localhost:" + BluetoothEchoDemo.RFCOMM_UUID + ";name=rfcommtest;authorize=true";
  
  public EchoServer() { 	 
    isInit = false;    
    Thread thread = new Thread(this);
    thread.start();
  }
  
  public void run() {
    
    if (!isInit) {
      // Initialization is done in the thread to avoid dead lock 'isInit' ensures it is done once only
      try {
        conn = null;
        localDevice = LocalDevice.getLocalDevice();
        localDevice.setDiscoverable( DiscoveryAgent.GIAC );              
        notifier = (StreamConnectionNotifier)Connector.open(serverUrl);      
      } catch (BluetoothStateException e) {        
        System.err.println( "BluetoothStateException: " + e.getMessage() );    
      } catch (IOException e) {        
        System.err.println( "IOException: " + e.getMessage() );      
      }          
      isInit=true;
      System.out.println( "Starting Echo Server" );     	      
    }
    
    // 
    try {
      System.out.println("\n\nServer Running...");
      
      // Pauses thread until Transmission occurs
      conn = notifier.acceptAndOpen();            

      // Read Data Transmission
      String msg = BluetoothEchoDemo.readData(conn);        
      System.out.println("Received Message from Client: " + msg);

      // Send Back a Message
      msg = "Hello Back from Server";        
      output = conn.openOutputStream();       
      output.write(msg.length()); // length is 1 byte
      output.write(msg.getBytes());
      output.close();                    
    } catch (Exception ex) {
      System.err.println("Bluetooth Server Running Error: " + ex);	
    }    
  }
}