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Thread: Bluetooth Client & Server

  1. #1
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    Exclamation Bluetooth Client & Server

    I've got 2 classes. A bluetooth client class which will be run on my laptop and a bluetooth server class which will be run on a pc. Apparently, I keep having this error and I could use some help...

    Exception in thread "main" java.io.IOException: Can't query remote device
    BlueCove stack shutdown completed
    at com.intel.bluetooth.RemoteDeviceHelper.getFriendly Name(RemoteDeviceHelper.java:404)
    at javax.bluetooth.RemoteDevice.getFriendlyName(Remot eDevice.java:130)
    at com.main.BluetoothClient.main(BluetoothClient.java :75)
    package com.main;
     
    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 BluetoothClient 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 {
     
        	BluetoothClient client=new BluetoothClient();
     
            //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(index-1);
            UUID[] uuidSet = new UUID[1];
            uuidSet[0]=new UUID("1101",true);
            int[] attrSet={0x1101};
     
            System.out.println("\nSearching for service...");
            agent.searchServices(attrSet,uuidSet,remoteDevice,client);
     
            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
            try{
            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);
            }catch(Exception e){
            	//e.printStackTrace();
            }
     
     
        }//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) {
            System.out.println("Inside Service Discovered");
            if(servRecord!=null && servRecord.length>0){
                connectionURL=servRecord[0].getConnectionURL(0,false);
                for (int i = 0; i < servRecord.length; i++) {
     
                	DataElement serviceName = servRecord[i].getAttributeValue(0x0100);
                	System.out.println("service " + serviceName.getValue() + " found ");
                }
    /*
            	for (int i = 0; i < servRecord.length; i++) {
                    String url = servRecord[i].getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false);
                   // System.out.println("Connection URL="+url);
                    if (url == null) {
                        continue;
                    }
                   // serviceFound.add(url);
                    DataElement serviceName = servRecord[i].getAttributeValue(0x0100);
                    if (serviceName != null) {
    					System.out.println("service " + serviceName.getValue() + " found " + url);
    	               // if(serviceName.getValue().equals("OBEX Object Push")){
    	                   // sendMessageToDevice(url);                
    	                //}
     
                    } else {
                        System.out.println("service found " + url);
                    }
                }*/
            }
            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
     
     
     
    }

    package com.main;
     
    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 javax.bluetooth.*;
    import javax.microedition.io.*;
     
    /**
    * Class that implements an SPP Server which accepts single line of
    * message from an SPP client and sends a single line of response to the client.
    */
    public class BluetoothServer {
     
        //start server
        private void startServer() throws IOException{
     
            //Create a UUID for SPP
            UUID uuid = new UUID("1101", true);
            //Create the servicve url
            String connectionString = "btspp://localhost:" + uuid +";name=Sample SPP Server";
     
            //open server url
            StreamConnectionNotifier streamConnNotifier = (StreamConnectionNotifier)Connector.open( connectionString );
     
            //Wait for client connection
            System.out.println("\nServer Started. Waiting for clients to connect...");
            StreamConnection connection=streamConnNotifier.acceptAndOpen();
     
            RemoteDevice dev = RemoteDevice.getRemoteDevice(connection);
            System.out.println("Remote device address: "+dev.getBluetoothAddress());
            System.out.println("Remote device name: "+dev.getFriendlyName(true));
     
            //read string from spp client
            InputStream inStream=connection.openInputStream();
            BufferedReader bReader=new BufferedReader(new InputStreamReader(inStream));
            String lineRead=bReader.readLine();
            System.out.println(lineRead);
     
            //send response to spp client
            OutputStream outStream=connection.openOutputStream();
            PrintWriter pWriter=new PrintWriter(new OutputStreamWriter(outStream));
            pWriter.write("Response String from SPP Server\r\n");
            pWriter.flush();
     
            pWriter.close();
            streamConnNotifier.close();
     
        }
     
     
        public static void main(String[] args) throws IOException {
     
            //display local device address and name
            LocalDevice localDevice = LocalDevice.getLocalDevice();
            System.out.println("Address: "+localDevice.getBluetoothAddress());
            System.out.println("Name: "+localDevice.getFriendlyName());
     
            BluetoothServer sampleSPPServer=new BluetoothServer();
            sampleSPPServer.startServer();
     
        }
    }


  2. #2
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    Default Re: Bluetooth Client & Server

    Hi ,
    it may be the device is incompatible with your server. try to test it with the some device. hope this help you

  3. #3
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    Default Re: Bluetooth Client & Server

    @oumaya, please note the date on this thread - its over 2 years old. Please avoid resurrecting posts that haven't seen activity in years - there are plenty of more current and active topics.

  4. #4
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    Default Re: Bluetooth Client & Server

    ok , sorry .

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