Bluetooth communication between J2SE server and J2ME client

Hi everyone!
I'm new here in this forum...
I try to make a small project to my studies,
My project will include J2SE server and J2ME client.
I'm stuck in the step of finding the server with the wireless toolkit emulator.
I found this issue in old subject: here
I try the solution in reply 6 but I don't understand exactly who to define kvem.home, and I got this error:
" You must define the system property "kvem.home" "
maybe someone can help me and explain how to do that?
thanks!

Hello,
I want to find out how this can be done, too. I tried with
System.setProperty("kvem.home", "C:\\WTK2.5.2");but I get an error:
java.lang.UnsatisfiedLinkError: com.sun.kvem.jsr082.impl.bluetooth.BluetoothController.setSystemProperty(Ljava/lang/String;Ljava/lang/String;)I included these files in the build path:
c:\WTK2.5.2\wtklib\gcf-op.jar
c:\WTK2.5.2\wtklib\kenv.zip
c:\WTK2.5.2\wtklib\kvem.jar
and I import com.sun.kvem.bluetooth.*;
I'd appreciate any help.

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Bluetooth simulation between J2SE server and J2ME client

hi there,
I have a working bluetooth client/server application (using BlueCove), with the server on a PC (the PC has bluetooth hardware) and the client on a mobile telephone.
I wish to move the application to a bluetooth simulated environment, however.
To simulate bluetooth between 2 mobiles, I could open 2 instances of the WTK simulator and the mobiles will find each other -- but this doesn't meet my needs. I wish to simulate the bluetooth environment between a J2SE server and a J2ME client.
Can I do this using the wireless toolkit? Does anyone have other ideas?
thanks,
Manoj

OK - I have the solution.
My PC (server) code used BlueCove to talk to the bluetooth stack. The trick is to use Sun's own KVM packages. This creates a virtual bluetooth device on your machine, shared by the WTK emulator.
Here's the server code:
package com.encube;
import java.awt.BorderLayout;
import java.io.InputStream;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.io.StreamConnectionNotifier;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import com.sun.kvem.bluetooth.BluetoothStateException;
import com.sun.kvem.bluetooth.DiscoveryAgent;
import com.sun.kvem.bluetooth.LocalDevice;
public class Server {
     public static final String UUID_STRING = "A781FDBA229B486A8C21CEBD00000000";
     public static final String SERVICE_NAME = "BTCHATSVR";
     private StreamConnectionNotifier server;
     JFrame jframe;
     JTextArea textArea;
     public static void main(String[] args) {
          Server svr = new Server();
          svr.doWork();
     public void doWork() {
          this.jframe = new JFrame("BT Server");
          this.jframe.setLayout(new BorderLayout());
          this.textArea = new JTextArea(6, 20);
          JScrollPane jsp = new JScrollPane(this.textArea);
          this.jframe.add(jsp, BorderLayout.CENTER);
          this.jframe.pack();
          this.jframe.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          this.jframe.setVisible(true);
          startServer();
     public void logMessage(String message) {
          this.textArea.setText(this.textArea.getText() + message + "\n");
          this.textArea.setCaretPosition(this.textArea.getText().length());
     public void startServer() {
          LocalDevice local;
          try {
               local = LocalDevice.getLocalDevice();
               local.setDiscoverable(DiscoveryAgent.GIAC);
               this.logMessage("max of "
                         + LocalDevice
                                   .getProperty("bluetooth.connected.devices.max")
                         + " connection(s) supported");
               String url = "btspp://localhost:" + UUID_STRING + ";name="
                         + SERVICE_NAME;
               server = (StreamConnectionNotifier) Connector.open(url);
               this.logMessage("waiting for connection...");
               StreamConnection conn = server.acceptAndOpen();
               this.logMessage("connection opened");
               InputStream is = conn.openInputStream();
               byte buffer[] = new byte[1000];
               while (true) {
                    int numChars = is.read(buffer);
                    String s = new String(buffer);
                    logMessage("received from mobile phone: " + s.substring(0, numChars));
          } catch (Exception e) {
               this.logMessage(e.getMessage());
}You need to include the location of WTK as the kvem.home define. If its installed in c:\wtk22 (the default), start the server with the parameter -Dkvem.home="c:\wtk22". You also need to include these 3 libraries:
c:\wtk22\wtklib\gcf-op.jar
c:\wtk22\wtklib\kenv.zip
c:\wtk22\wtklib\kvem.jar
That's it for the server. My code of the sample client (the mobile phone, running in the WTK emulator) is messy (sorry about that -- still cleaning it up)!
import java.io.IOException;
import java.io.OutputStream;
import java.util.Enumeration;
import java.util.Timer;
import java.util.TimerTask;
import java.util.Vector;
import javax.bluetooth.BluetoothStateException;
import javax.bluetooth.DeviceClass;
import javax.bluetooth.DiscoveryAgent;
import javax.bluetooth.DiscoveryListener;
import javax.bluetooth.LocalDevice;
import javax.bluetooth.RemoteDevice;
import javax.bluetooth.ServiceRecord;
import javax.bluetooth.UUID;
import javax.microedition.io.Connector;
import javax.microedition.io.StreamConnection;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.StringItem;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
public class MainMIDlet extends MIDlet {
     protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
          // TODO Auto-generated method stub
     protected void pauseApp() {
          // TODO Auto-generated method stub
     protected void startApp() throws MIDletStateChangeException {
          MainForm mainForm = new MainForm();
          Display.getDisplay(this).setCurrent(mainForm);
          mainForm.initializeDisplay();
class MainForm extends Form {
     public static final String UUID_STRING = "A781FDBA229B486A8C21CEBD00000000";
     private StringItem log;
     private DiscoveryAgent agent;
     Object lock = new Object();
     static EndPoint currentEndPoint;
     static Vector serviceRecords = new Vector();
     public MainForm() {
          super("BT Client");
     public void initializeDisplay() {
          this.log = new StringItem("", "");
          this.append(this.log);
          try {
               LocalDevice local = LocalDevice.getLocalDevice();
               agent = local.getDiscoveryAgent();
               agent.startInquiry(DiscoveryAgent.GIAC, new Listener(this, agent));
          } catch (BluetoothStateException e) {
               this.logMessage(e.getMessage());
     public void logMessage(String message) {
          this.log.setText(this.log.getText() + message + "\n");
     public void processServiceRecord(ServiceRecord sr) {
          try {
               String url = sr.getConnectionURL(
                         ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);
               logMessage("opening URL " + url);
               StreamConnection conn = (StreamConnection) Connector.open(url);
               OutputStream os = conn.openOutputStream();
               String smessage = "test message from phone emulator";
               os.write(smessage.getBytes());
          } catch (IOException e) {
               logMessage("error while processing service record: "
                         + e.getMessage());
     class Listener implements DiscoveryListener {
          private MainForm mainForm;
          private Vector pendingEndPoints;
          private DiscoveryAgent agent;
          public Listener(MainForm mainForm, DiscoveryAgent agent) {
               this.mainForm = mainForm;
               this.agent = agent;
               this.pendingEndPoints = new Vector();
          public void deviceDiscovered(RemoteDevice dev, DeviceClass deviceClass) {
               this.mainForm.logMessage("found device");
               this.pendingEndPoints.addElement(new EndPoint(dev));
          public void inquiryCompleted(int arg0) {
               this.mainForm.logMessage("done searching for devices");
               for (Enumeration enm = this.pendingEndPoints.elements(); enm
                         .hasMoreElements();) {
                    EndPoint ep = (EndPoint) enm.nextElement();
                    ep.calculateRemoteName();
                    this.mainForm.logMessage("device name: " + ep.getRemoteName());
               new Timer().schedule(new DoServiceDiscovery(), 100);
          public void servicesDiscovered(int transID, ServiceRecord[] arg1) {
               mainForm.logMessage("found " + arg1.length
                         + " service(s) on device "
                         + currentEndPoint.getRemoteName());
               for (int i = 0; i < arg1.length; i++) {
                    serviceRecords.addElement(arg1);
          public void serviceSearchCompleted(int arg0, int arg1) {
               synchronized (lock) {
                    * unlock to proceed to service search on next device see
                    * DoServiceDiscovery.run()
                    lock.notifyAll();
               mainForm.logMessage("done searching for services on "
                         + currentEndPoint.getRemoteName());
          * Inner class. Called a short time after the last device is found.
          class DoServiceDiscovery extends TimerTask {
               public void run() {
                    try {
                         UUID uuids[] = new UUID[2];
                         * ok, we are interesting in btspp services only and only
                         * known ones -- check for our UUID
                         uuids[0] = new UUID(0x1101);
                         uuids[1] = new UUID(MainForm.UUID_STRING, false);
                         for (Enumeration enm = pendingEndPoints.elements(); enm
                                   .hasMoreElements();) {
                              EndPoint ep = (EndPoint) enm.nextElement();
                              mainForm.logMessage("searching for services on "
                                        + ep.getRemoteName());
                              currentEndPoint = ep;
                              ep.transId = agent.searchServices(null, uuids,
                                        ep.remoteDev, new Listener(mainForm, agent));
                              synchronized (lock) {
                                   try {
                                        lock.wait();
                                   } catch (InterruptedException e) {
                                        // do nothing
                                        mainForm.logMessage("exception while waiting: "
                                                  + e.getMessage());
                         mainForm.logMessage("discovered all services; found "
                                   + serviceRecords.size() + " record(s)");
                         * assume we have just 1 service record
                         if (serviceRecords.size() > 0) {
                              processServiceRecord((ServiceRecord) serviceRecords
                                        .elementAt(0));
                    } catch (Exception e) {
                         mainForm.logMessage("error during service discovery: "
                                   + e.getMessage());
class MiscUtils {
     * Get the friendly name for a remote device. On the Nokia 6600, we're able
     * to get the friendlyname while doing device discovery, but on the Nokia
     * 6230i, an exception is thrown. On the 6230i, we get the friendly name
     * only after all devices have been discovered -- when the callback
     * inquiryCompleted is called.
     * @param dev
     * the device to examine
     * @return a friendly name for the device, otherwise the IP address as a
     * hex-string
     public static String getDeviceName(RemoteDevice dev) {
          String devName;
          try {
               devName = dev.getFriendlyName(false);
          } catch (IOException e) {
               devName = dev.getBluetoothAddress();
          return devName;
     public static EndPoint findEndPointByTransId(Vector endpoints, int id) {
          for (int i = 0; i < endpoints.size(); i++) {
               EndPoint endpt = (EndPoint) endpoints.elementAt(i);
               if (endpt.getTransId() == id) {
                    return endpt;
          return null; // not found, return null
class EndPoint {
     // remote device object
     RemoteDevice remoteDev;
     // remote device class
     DeviceClass remoteClass;
     // remote service URL
     String remoteUrl;
     // service hosted on this device -- populated after searching for devices
     ServiceRecord serviceRecord;
     // bluetooth discovery transId, obtainsed from searchServices
     int transId = -1; // -1 must be used for default. cannot use 0
     // local user nick name
     String localName;
     // remote user nick name
     String remoteName;
     // vector of ChatPacket pending to be sent to remote service.
     // when message is sent, it is removed from the vector.
     Vector msgs = new Vector();
     public EndPoint(RemoteDevice rdev) {
          remoteDev = rdev;
     * This functionality isn't called in the constructor because we cannot
     * retrieve the friendly name while searching for devices on all phones. On
     * some phones we have to wait until after devices have been discovered.
     public void calculateRemoteName() {
          this.remoteName = MiscUtils.getDeviceName(this.remoteDev);
     public RemoteDevice getRemoteDev() {
          return remoteDev;
     public String getRemoteName() {
          return remoteName;
     public ServiceRecord getServiceRecord() {
          return serviceRecord;
     public void setServiceRecord(ServiceRecord serviceRecord) {
          this.serviceRecord = serviceRecord;
     public int getTransId() {
          return transId;
...and that's it. Start the server, then the client (all on the same machine) and you've simulated bluetooth between the 2.
To get the server working with a real mobile, you'll need to use the BlueCove library instead of the 3 WTK jars (and can remove the kvem.home directive as well). The rest of the code should remain the same (haven't quite tested that yet!).
cheers
Manoj
null

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"Cameron Purdy" <[email protected]> wrote in message
news:[email protected]..
Sounds like a reverse DNS lookup or similar network timeout.Thanks for the suggestion, but then why would the first client on w2k or XP
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>
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"vinay moharil" <[email protected]> wrote in message
news:[email protected]..
I am having a real bizzare problem with WLS 7.0.1 running on AIX 5.1 and
clients on windows. We have J2SE Swing application as a client.
If the client is w2k or XP, the first client gets good response. If Istart
another client the second client is horribly slow (2 sec vs 16 sec).
Even
if
I kill the first client the second client continues to be slow. If I
have
2
clients open together, the first one continues giving 2 sec response
while
the second one continues with 16 sec. For that matter if I start another
client after shutting down first one I get slow (16 sec) response.
If the client is NT client I always get good and consistent responsefrom
the server. Irrespective of how many client I have on the NT machine, Ikeep
getting good response. NT and W2K laptops are seating right next to each
other on the same n/w and infact the NT is a much slower and lessor
memory
machine than W2K.
We did similar tests keeping server on Solaris or NT server or W2Kserver,
and the clients "behave" normally i.e I get consistent repsponse time(it
may be slow or fast, but it is consistent and is consistent b/w NT andW2K).
We even tried putting my laptop on the same network as the AIX server,
but
it did not help. Unfortunately some of our clients will be using AIX and
W2K.
HELP!!!!

Communication between HP eprint and Google Cloud Print

Hi,
the communication between HP eprint and Google Cloud Print seems to be broken. At least for me.
The documents do get printed when I print vio Chrome browser or Cloud Print dashboard -- but the status in cloud print remains as "submitted". It seems like somehow the HP eprint status doen't get reported back to cloud print. In HP eprintcenter the log says "printed".
Well, I wonder who will take care of this problem ... (Hope it will not result in fingerpointing only ...)
Thanks for your support!
Best,
George
This question was solved.
View Solution.

Are you able to log back in later and the status at Google Cloud print update to reflect the true outcome of the print job? Or does it just remain as "submitted". Otherwise, if it is printing and showing in the log at ePrint Center (EPC) as printed, the issue would not be on the ePrint side but on Google's
I am a former employee of HP...
How do I give Kudos?| How do I mark a post as Solved?

Bluetooth communication between J2SE server and J2ME client

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