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Thread: Bluetooth Client

  1. #1
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    Default Bluetooth Client

    I am a beginner on java programming and i have a problem.
    I use a bluetooth module (dwengo) in combination with a microcontroller (PIC16F877A)
    I want write a bluetooth client program in java to communicate with the microcontoller
    Examples of clients on internet do not work or give errors I cant'n resolve.
    There is one program ( SampleSPPClient ) that give no errors and shows the bluetooth devices present.
    But when I choose my bluetooth module I got an error (Device does not support Simple SPP Service )
    I think that I have to use an other service of bluetooth but I don't know how to implement
    I would be very greetfull if somebody can help me.

    Here is the program I tried to use

     
    import java.io.BufferedReader;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.InputStreamReader;
    import java.io.OutputStream;
    import java.io.OutputStreamWriter;
    import java.io.PrintWriter;
    import java.util.Vector;
     
    import javax.bluetooth.DataElement;
    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;
     
    /**
    * A simple SPP client that connects with an SPP server
    */
    public class SampleSPPClient implements DiscoveryListener{
     
    //object used for waiting
    private static Object lock=new Object();
     
    //vector containing the devices discovered
    private static Vector vecDevices=new Vector();
     
    private static String connectionURL=null;
     
    public static void main(String[] args) throws IOException {
     
    SampleSPPClient client=new SampleSPPClient();
     
    //display local device address and name
    LocalDevice localDevice = LocalDevice.getLocalDevice();
    System.out.println("Address: "+localDevice.getBluetoothAddress());
    System.out.println("Name: "+localDevice.getFriendlyName());
     
    //find devices
    DiscoveryAgent agent = localDevice.getDiscoveryAgent();
     
    System.out.println("Starting device inquiry...");
    agent.startInquiry(DiscoveryAgent.GIAC, client);
     
    try {
    synchronized(lock){
    lock.wait();
    }
    }
    catch (InterruptedException e) {
    e.printStackTrace();
    }
     
    System.out.println("Device Inquiry Completed. ");
     
    //print all devices in vecDevices
    int deviceCount=vecDevices.size();
     
    if(deviceCount <= 0){
    System.out.println("No Devices Found .");
    System.exit(0);
    }
    else{
    //print bluetooth device addresses and names in the format [ No. address (name) ]
    System.out.println("Bluetooth Devices: ");
    for (int i = 0; i <deviceCount; i++) {
    RemoteDevice remoteDevice=(RemoteDevice)vecDevices.elementAt(i) ;
    System.out.println((i+1)+". "+remoteDevice.getBluetoothAddress()+" ("+remoteDevice.getFriendlyName(true)+")");
    }
    }
     
    System.out.print("Choose Device index: ");
    BufferedReader bReader=new BufferedReader(new InputStreamReader(System.in));
     
    String chosenIndex=bReader.readLine();
    int index=Integer.parseInt(chosenIndex.trim());
     
    //check for spp service
    RemoteDevice remoteDevice=(RemoteDevice)vecDevices.elementAt(in dex-1);
    UUID[] uuidSet = new UUID[1];
    uuidSet[0]=new UUID("446118f08b1e11e29e960800200c9a66", false);
     
    System.out.println("\nSearching for service...");
    agent.searchServices(null,uuidSet,remoteDevice,cli ent);
    try {
    synchronized(lock){
    lock.wait();
    }
    }
    catch (InterruptedException e) {
    e.printStackTrace();
    }
     
    if(connectionURL==null){
    System.out.println("Device does not support Simple SPP Service.");
    System.exit(0);
    }
     
    //connect to the server and send a line of text
    StreamConnection streamConnection=(StreamConnection)Connector.open( connectionURL);
     
    //send string
    OutputStream outStream=streamConnection.openOutputStream();
    PrintWriter pWriter=new PrintWriter(new OutputStreamWriter(outStream));
    pWriter.write("Test String from SPP Client\r\n");
    pWriter.flush();
     
     
    //read response
    InputStream inStream=streamConnection.openInputStream();
    BufferedReader bReader2=new BufferedReader(new InputStreamReader(inStream));
    String lineRead=bReader2.readLine();
    System.out.println(lineRead);
    }//main
     
    //methods of DiscoveryListener
    public void deviceDiscovered(RemoteDevice btDevice, DeviceClass cod) {
    //add the device to the vector
    if(!vecDevices.contains(btDevice)){
    vecDevices.addElement(btDevice);
    }
    }
     
    //implement this method since services are not being discovered
    public void servicesDiscovered(int transID, ServiceRecord[] servRecord) {
    if(servRecord!=null && servRecord.length>0){
    connectionURL=servRecord[0].getConnectionURL(0,false);
    }
    synchronized(lock){
    lock.notify();
    }
    }
     
    //implement this method since services are not being discovered
    public void serviceSearchCompleted(int transID, int respCode) {
    synchronized(lock){
    lock.notify();
    }
    }
     
    public void inquiryCompleted(int discType) {
    synchronized(lock){
    lock.notify();
    }
     
    }//end method
     
    }


  2. #2
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    Default Re: Bluetooth Client

    Welcome to the Forum! Please read this topic to learn how to post your code correctly along with other useful info for newcomers.

  3. #3
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    Default Re: Bluetooth Client

    Sorry, is there a way to correct this or do I have to make a new Thread ?

  4. #4
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    Default Re: Bluetooth Client

    Do you see an "Edit Post" label at the bottom of the post you'd like to change? If so, press that and edit away.

  5. #5
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    Default Re: Bluetooth Client

    Sorry, this is my first experience with a forum. I have at the beginning the javacode [highlight=Java] and [highlight] at the end inserted but I see no change.

  6. #6
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    Default Re: Bluetooth Client

    Very close. The ending tag is [/highlight], with the '/' at the beginning.

  7. #7
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    Default Re: Bluetooth Client

    Thanks

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