[bacchdani]

Hi everybody!
I'm actually trying to write a very simple program to communicate a message PC-->Mobile, something like a simple chat.

I've implemented the connection, and it seems to work properly, 'cause when the application starts, a message arrive to mobile but it's something like "B@f828ed68"...I don't know, it seems to be a memory address...Surely it isn't the message I would like to read!:-D
Am I wrong in using output/input streams, maybe?

Please, HELP ME!!!

Here's the code I found in internet:

SERVER SIDE (PC)
-----------

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

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

public class btj2seserver {

static String ServiceUrl = "btspp://localhost:10203040607040A1B1C1DE100;name=SPP";

public static void main(String[] args) {
System.out.println("server is running...");

try {
// create a server connection
StreamConnectionNotifier notifier =(StreamConnectionNotifier) Connector.open(ServiceUrl);
System.out.println("Created server connection.");

// accept client connections
StreamConnection connection = notifier.acceptAndOpen();
System.out.println("Client connection accepted.");

// prepare to send/receive data
byte buffer[] = new byte[100];
String msg = "hello there, client";
InputStream is = connection.openInputStream();
OutputStream os = connection.openOutputStream();
System.out.println("Opened in/out streams.");

// send data to the client
os.write(msg.getBytes());
System.out.println("Message is flying.");

// read data from client
is.read(buffer);
System.out.println("Message is coming.");

connection.close();
} catch(IOException e) {
e.printStackTrace();
}
}

}


CLIENT SIDE (MOBILE)
-----------

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.bluetooth.BluetoothStateException;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.ServiceRecord;
import javax.bluetooth.UUID;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;


public class Client extends MIDlet implements Runnable, CommandListener {
StreamConnection conn;


public void run(){

//make a form and show the user "Locating the server"
Form form = new Form("Client");
Display.getDisplay(this).setCurrent(form);
form.append("Locating server...");



try{




//set up the bluetooth connection:
LocalDevice local = LocalDevice.getLocalDevice();
form.append("Local dev OK:" + local.getFriendlyName() + ":" + local.getBluetoothAddress());

DiscoveryAgent agent = local.getDiscoveryAgent();
form.append("Discovery Agent OK...");
String connString = agent.selectService(
new UUID("10203040607040A1B1C1DE100", false), ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);


System.out.println(connString);
if(connString != null){

try {
conn = (StreamConnection) Connector.open(connString);
form.append("Connection OK...");
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}

try {
byte buffer[] = new byte[100];
String msg = "hello there, server";
InputStream is = conn.openInputStream();
OutputStream os = conn.openOutputStream();
// send data to the server
os.write(msg.getBytes());
// read data from the server
is.read(buffer);
form.append(buffer.toString());

conn.close();
} catch(IOException e) {
e.printStackTrace();
}




} else {
//show the user an error if it occurs
form.append("Unable to locate service");
}
} catch (BluetoothStateException e){
//show the user an error if it occurs
form.append("Problem in the connection");
}
}

public void startApp()
throws MIDletStateChangeException{
new Thread(this).start();
}

public void pauseApp(){}

public void destroyApp(boolean unconditional){}

public void commandAction(Command c, Displayable d){
notifyDestroyed();
}
void destroyImpl() {

}

}

[bacchdani]

An update:

I've changed the code below to send only an integer from mobile to pc. When I print to screen the return value is -1. This mean that there's no incoming data in the stream...Well, I really don't know... Maybe I first have to do something like an handshake to reach the exact time in wich the data is sent...I mean, maybe the stream is empty because, when I sent the message, the server is not yet ready to get it...any ideas? PLEASE I NEED HELP!!!!!

[traud]

Originally Posted by bacchdani

form.append(buffer.toString());

String data = new String(buffer, "UTF-8");
form.append(data);

On you server, you should use os.write(msg.getBytes("UTF-8"));, too. Anyway for the start, I commend to use the DataInput and DataOutput streams and their integer and string features. Does that help?