Linux Bluetooth non trovando Servizio Android con UUID

Question

Sto cercando di scrivere un programma su un sistema embedded in esecuzione Gumstix (Linux) per connettersi e comunicare con un dispositivo Android 2.x tramite Bluetooth. Il Gumstix è il client e l'Android è il server. Sto cercando di trovare il numero del canale che i miei usi di servizio Android in modo che il Gumstix in grado di connettersi ad esso, ma per qualche motivo la mia routine non restituisce un numero di canale, perché non sembra trovare un servizio con un UUID corrispondente.

Ho il sospetto che l'UUID fornito alla routine Gumstix e l'UUID del dispositivo Android non sono in realtà lo stesso numero. Android richiede un 128 bit UUID:

Da Documentazione Android :

  

UUID è una rappresentazione immutabile   a 128 bit univoco universale   identificatore (UUID).

     

Ci sono molteplici, layout di variante   UUID, ma questa classe si basa su   variante 2 di RFC 4122, Leach-Salz   variante. Questa classe può essere utilizzata per   modello alternativo varianti, ma la maggior parte   i metodi saranno supportato in   questi casi; vedere ogni metodo per

UUID utilizzato in Android:

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

C Codice in Gumstix Cercare un commento indicando dove fallisce

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:

codice di Android per l'acceptThread (accetta connessioni), ConnectThread (completa la connessione), e ConnectedThread (mantiene la connessione, stabilire handler)

/**
 * 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;
            }
        }
    }

Il codice di Android è stato adottato dalla esempio Bluetooth Chat qui

Answer 1

Avete qualsiasi servizio (in genere oltre RFCOMM / SPP) con UUID {0, 0, 0, 0xABCD} in esecuzione sul dispositivo Android?

Probabilmente (a livello di codice creare il servizio con l'UUID specificato e sono in esecuzione sul dispositivo per essere in grado di connettersi ad esso.

Citando da Android Documentazione:

**

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.

**