Linux Bluetooth ne pas trouver le service Android avec UUID

Question

Je suis en train d'écrire un programme sur un système embarqué en cours d'exécution gumstix (Linux) pour se connecter et parler à un périphérique Android 2.x via Bluetooth. Le gumstix est le client et l'Android est le serveur. Je suis en train de trouver le numéro de canal que mes utilisations de service Android afin que le gumstix peuvent s'y connecter, mais pour une raison quelconque ma routine ne retourne pas un numéro de canal, car il ne semble pas trouver un service avec un UUID correspondant.

Je soupçonne que le UUID fourni à la routine de gumstix et l'UUID sur l'appareil Android ne sont pas en fait le même nombre. Android nécessite 128 bits UUID:

De Android Documentation :

  

UUID est une représentation immuable   128 bits unique universel   identifiant (UUID).

     

Il y a plusieurs mises en page, variantes de   UUID, mais cette classe est basée sur   variante 2 de la RFC 4122, l'Leach-Salz   une variante. Cette classe peut être utilisée pour   modèle alternatif des variantes, mais la plupart des   les méthodes seront non prises en charge   ces cas; voir chaque méthode pour

UUID utilisé dans Android:

public static final String UUID_STRING = "00000000-0000-0000-0000-00000000ABCD";
private static final UUID MY_UUID = UUID.fromString(UUID_STRING);

code C dans gumstix Rechercher des commentaires indiquant où il échoue

int main(int argc , char **argv)
{
//Android wants a 128 bit UUID why are we only giving a 32 bit UUID
uint32_t svc_uuid_int[] = { 0 , 0 , 0 , 0xABCD } ;

int status ;
bdaddr_t target ;
uuid_t svc_uuid ;
sdp_list_t *response_list , *search_list , *attrid_list ;
sdp_session_t *session = 0;
uint32_t range = 0x0000ffff ;
uint8_t port = 0;

if(argc < 2)
{
    fprintf(stderr , "usage: %s <bt_addr>\n" , argv [ 0 ] ) ;
    exit ( 2 ) ;
}

str2ba ( argv[1] , &target ) ;
// connect to the SDP server running on the remote machine
session = sdp_connect ( BDADDR_ANY, &target, SDP_RETRY_IF_BUSY  );
//  printf("session %u\n",session);

sdp_uuid128_create( &svc_uuid, &svc_uuid_int ) ;
search_list = sdp_list_append( 0, &svc_uuid ) ;
attrid_list = sdp_list_append( 0, &range ) ;

// get a list of service records that have UUID 0xabcd
response_list = NULL ;   //ERROR: response_list SHOULD GET INITIALIZED BUT IT STAYS NULL CAUSING THE PROGRAM TO NEVER ENTER THE FOR LOOP BELOW.
status = sdp_service_search_attr_req(session , search_list , SDP_ATTR_REQ_RANGE , attrid_list, &response_list ) ;
printf("status %d\n",status);

if( status == 0 )
{
    sdp_list_t *proto_list = NULL ;
    sdp_list_t *r = response_list ;
    // go through each of the service records
    for ( ; r ; r = r->next )
    {
        sdp_record_t *rec = (sdp_record_t * ) r->data ;
        // get a list of the protocol sequences
        if( sdp_get_access_protos( rec, &proto_list ) == 0 ) 
        {
            // get the RFCOMM port number
            port = sdp_get_proto_port( proto_list , RFCOMM_UUID ) ;
            sdp_list_free( proto_list, 0 );
        }
        sdp_record_free( rec ) ;
    }
}

sdp_list_free( response_list, 0 );
sdp_list_free( search_list, 0 );
sdp_list_free( attrid_list, 0 );
sdp_close( session ) ;
if( port != 0 )
{
    printf( "found service running on RFCOMM port %d\n" , port ) ;
}
return 0;

}

EDIT:

Code applications pour le acceptThread (accepte les connexions), ConnectThread (termine la connexion), et ConnectedThread (maintient la connexion, établir gestionnaire)

/**
 * This thread runs while listening for incoming connections. It behaves
 * like a server-side client. It runs until a connection is accepted
 * (or until canceled).
 */
private class AcceptThread extends Thread {
    // The local server socket
    private final BluetoothServerSocket mmServerSocket;

    public AcceptThread() {
        BluetoothServerSocket tmp = null;

        // Create a new listening server socket
        try {
            tmp = mAdapter.listenUsingRfcommWithServiceRecord(NAME, MY_UUID);
        } catch (IOException e) {
            Log.e(TAG, "listen() failed", e);
        }
        mmServerSocket = tmp;
    }

    public void run() {
        if (D) Log.d(TAG, "BEGIN mAcceptThread" + this);
        setName("AcceptThread");
        BluetoothSocket socket = null;

        // Listen to the server socket if we're not connected
        while (mState != STATE_CONNECTED) {
            try {
                // This is a blocking call and will only return on a
                // successful connection or an exception
                if(D) Log.i("prism", "Waiting to connect************");
                socket = mmServerSocket.accept();
                if(D) Log.i("prism", "We have accepted connection and are connected***************");
            } catch (IOException e) {
                Log.e(TAG, "accept() failed", e);
                break;
            }

            // If a connection was accepted
            if (socket != null) {
                synchronized (BluetoothServer.this) {
                    switch (mState) {
                    case STATE_LISTEN:
                    case STATE_CONNECTING:
                        // Situation normal. Start the connected thread.
                        connected(socket, socket.getRemoteDevice());
                        break;
                    case STATE_NONE:
                    case STATE_CONNECTED:
                        // Either not ready or already connected. Terminate new socket.
                        try {
                            if (D) Log.i("prism", "Bluetooth already connected, abandoning request from " + socket.getRemoteDevice().getName());
                            socket.close();
                        } catch (IOException e) {
                            Log.e(TAG, "Could not close unwanted socket", e);
                        }
                        break;
                    }
                }
            }
        }
        if (D) Log.i(TAG, "END mAcceptThread");
    }

    public void cancel() {
        if (D) Log.d(TAG, "cancel " + this);
        try {
            mmServerSocket.close();
        } catch (IOException e) {
            Log.e(TAG, "close() of server failed", e);
        }
    }
}

/**
 * This thread runs while attempting to make an outgoing connection
 * with a device. It runs straight through; the connection either
 * succeeds or fails.
 */
private class ConnectThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final BluetoothDevice mmDevice;

    public ConnectThread(BluetoothDevice device) {
        mmDevice = device;
        BluetoothSocket tmp = null;

        // Get a BluetoothSocket for a connection with the
        // given BluetoothDevice
        try {
            tmp = device.createRfcommSocketToServiceRecord(MY_UUID);
        } catch (IOException e) {
            Log.e(TAG, "create() failed", e);
        }
        mmSocket = tmp;
    }

    public void run() {
        Log.i(TAG, "BEGIN mConnectThread");
        setName("ConnectThread");

        // Always cancel discovery because it will slow down a connection
        mAdapter.cancelDiscovery();

        // Make a connection to the BluetoothSocket
        try {
            // This is a blocking call and will only return on a
            // successful connection or an exception
            Log.i(TAG, "mmSocket.connect() is initiaiting in the ConnectThread");
            mmSocket.connect();
            Log.i(TAG, "mmSocket.connect() complete...");
        } catch (IOException e) {
            Log.e(TAG, "Connection attempt failed, closing the socket");
            connectionFailed();
            // Close the socket
            try {
                mmSocket.close();
            } catch (IOException e2) {
                Log.e(TAG, "unable to close() socket during connection failure", e2);
            }
            // Start the service over to restart listening mode
            BluetoothServer.this.start();
            return;
        }

        // Reset the ConnectThread because we're done
        synchronized (BluetoothServer.this) {
            mConnectThread = null;
        }

        // Start the connected thread
        connected(mmSocket, mmDevice);
    }

    public void cancel() {
        try {
            mmSocket.close();
        } catch (IOException e) {
            Log.e(TAG, "close() of connect socket failed", e);
        }
    }
}

/**
 * This thread runs during a connection with a remote device.
 * It handles all incoming and outgoing transmissions.
 */
private class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        Log.d(TAG, "create ConnectedThread");
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the BluetoothSocket input and output streams
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) {
            Log.e(TAG, "temp sockets not created", e);
        }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        Log.i(TAG, "BEGIN mConnectedThread");
        byte[] buffer = new byte[1024];
        int bytes;

        // Keep listening to the InputStream while connected
        while (true) {
            try {
                // Read from the InputStream
                bytes = mmInStream.read(buffer);

                // Send the obtained bytes to the UI Activity
                mHandler.obtainMessage(Bluetooth.MESSAGE_READ, bytes, -1, buffer)
                        .sendToTarget();
            } catch (IOException e) {
                Log.e(TAG, "disconnected", e);
                connectionLost();
                break;
            }
        }
    }

Le code Android a été adopté par l'exemple Bluetooth chat

Answer 1

Avez-vous un service (généralement plus RFCOMM / SPP) avec UUID {0, 0, 0, 0xabcd} courir sur l'appareil Android?

Vous devrez probablement (créer par programme le service avec l'UUID spécifié et l'ont en cours d'exécution sur l'appareil pour pouvoir s'y connecter.

Je cite Android Documentation:

**

public BluetoothServerSocket listenUsingRfcommWithServiceRecord (String name, UUID uuid)
Create a listening, secure RFCOMM Bluetooth socket with Service Record.
A remote device connecting to this socket will be authenticated and communication on this socket will be encrypted.
Use accept() to retrieve incoming connections from a listening BluetoothServerSocket.
The system will assign an unused RFCOMM channel to listen on.
The system will also register a Service Discovery Protocol (SDP) record with the local SDP server containing the specified UUID, service name, and auto-assigned channel. Remote Bluetooth devices can use the same UUID to query our SDP server and discover which channel to connect to. This SDP record will be removed when this socket is closed, or if this application closes unexpectedly.
Use createRfcommSocketToServiceRecord(UUID) to connect to this socket from another device using the same UUID.

**