Main.java

package net.sf.lab3f.bluetooth;

import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.BufferedReader;
import java.io.BufferedWriter;

import java.util.HashMap;
import java.util.Map;

import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.io.StreamConnectionNotifier;

public class Main {	

 private Map <String, StreamConnection> conns = new HashMap <String, StreamConnection> (); 
 private Map <String, InputStream>  inputs    = new HashMap <String, InputStream> (); 
 private Map <String, OutputStream> outputs   = new HashMap <String, OutputStream> (); 
 private StreamConnectionNotifier notifier;
 private Thread mainThread = new Thread(new Runnable(){
  public void run(){
   while(true){	  
    try{	  
     StreamConnection conn  = notifier.acceptAndOpen();
     System.out.println("New BT connection...");
     byte[] ba = new byte[15];
     InputStream  is = conn.openInputStream();
     OutputStream os = conn.openOutputStream();
     is.read(ba);
     String s = new String(ba);
     conns.put(s, conn);
     inputs.put(s, is);
     outputs.put(s, os);
    }
    catch(IOException ex){System.out.println(ex);} 
   }	   
  }	  
 });

 public BufferedWriter getWriter(String s) throws IOException{
  OutputStream os = outputs.get(s);
  if(os == null)return null;
  return new BufferedWriter(new OutputStreamWriter(os));
 }	 

 public BufferedReader getReader(String s) throws IOException{
  InputStream is = inputs.get(s);
  if(is == null)return null;
  return new BufferedReader(new InputStreamReader(is));
 }	 

 public void start() throws Exception {
  String url = "btspp://localhost:0A1B2C3D4E5F60718293A4B5C6D7E8F9;name=bt_buttons_server";
  notifier = (StreamConnectionNotifier)Connector.open(url);
  mainThread.start();
  System.out.println("[INFO] Bluetooth service starts.");	 
 }

 public void stop() throws Exception {
  try{
   mainThread.interrupt();	  
   for(StreamConnection conn : conns.values())conn.close();
  }
  catch(IOException ex){System.out.println(ex);} 
 }	 
}