Initialize Bluetooth connection between Android (server) and bluecove on PC (client)

Question

I know there are other topics, but in my case, I want the Android device to initialize the Bluetooth connection as a server. I followed the documentation and I wrote the server this way:

private class AcceptThread implements Runnable { private final BluetoothServerSocket mmServerSocket; public AcceptThread() { BluetoothServerSocket tmp = null; try { tmp = mBluetooth.listenUsingRfcommWithServiceRecord( "myService", mUuid); } catch (IOException e) { } mmServerSocket = tmp; } public void run() { BluetoothSocket socket = null; // Keep listening until exception occurs or a socket is returned while (true) { try { System.out.println("SERVER SOCKET LISTENING"); socket = mmServerSocket.accept(); } catch (IOException e) { break; } // If a connection was accepted if (socket != null) { System.out.println("SIGNAL RECEIVED"); // Do work to manage the connection (in a separate thread) Toast.makeText(getApplicationContext(), "SIGNAL RECEIVED", Toast.LENGTH_LONG).show(); try { mmServerSocket.close(); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } break; } } } /** Will cancel the listening socket, and cause the thread to finish */ public void cancel() { try { mmServerSocket.close(); } catch (IOException e) { } } } 

On the other hand, I have a bluecove API that detects remote devices and services.

 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.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(index-1); UUID[] uuidSet = new UUID[1]; uuidSet[0]=new UUID("4e3aea40e2a511e095720800200c9a66", false); System.out.println("\nSearching for service..."); agent.searchServices(null,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 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) { System.out.println(servRecord[0].getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false)); if(servRecord!=null && servRecord.length>0){ connectionURL=servRecord[0].getConnectionURL(ServiceRecord.AUTHENTICATE_ENCRYPT,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 } 

The client discovered the device and the service, but when it received the URL from ServiceRecord, it established a connection that it fails. It retrieves the Url in which the channel is incorrect, and it throws an exception: javax.bluetooth.BluetoothConnectionException: failed to connect;

How can i solve the problem?

Answer 1

I managed to find some ServiceRecords phone when using:

  UUID[] uuidSet = new UUID[1]; uuidSet[0]=new UUID(0x0100); int[] attrIds = { 0x0100 }; System.out.println("\nSearching for service..."); agent.searchServices(attrIds, uuidSet, remoteDevice, client); 

And you call lock.notify () twice after serviceSearch, delete it in the servicesDiscovered function.

You should also look at the service records and look for the one you are interested in. The URL indicates btgoep: // or btspp: //

When searching for a for loop, use this code to display the service name

  for(int i = 0; i < servRecord.length; i++) { String url = servRecord[i].getConnectionURL(ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false); DataElement serviceName = srs[i].getAttributeValue(0x0100); if (serviceName != null) { System.out.println("service " + serviceName.getValue() + " found " + url); } else { System.out.println("service found " + url); } 

I have an exact problem, it looks like the android api is not registering ServiceRecord with SDP, so the Bluicove api can find it. No matter which UUID I use, it will find only those that my phone registers by default, I e Audio gateways and Telnet OBEX push, etc.

EDIT --- I had the same problem, but I realized that in fact I have not yet called listenUsingInsecureRFCOMMSocket. And then he did not register the service record. But after that, everything turned out fine.