Linux Bluetooth ne trouve pas le service Android avec UUID

Question

J'essaye d'écrire un programme sur un système embarqué sous GUMSTIX (Linux) pour me connecter et me connecter à un appareil Android 2.x via bluetooth. Le GUMSTIX est le client et l'Android est le serveur. J'essaie de trouver le numéro de canal que mon service Android utilise pour que le GUMSTIX puisse s'y connecter mais pour une raison quelconque, ma routine ne renvoie pas un numéro de canal car il ne semble pas trouver de service avec un UUID correspondant.

Je suppose que l'UUID fourni à la routine GUMSTIX et l'UUID sur l'appareil Android ne sont pas réellement le même nombre. Android nécessite 128 bits UUID:

De l'Android Documentation:

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

Il y a plusieurs mises en page, variantes de UUID, mais cette classe est basée sur variante 2 de la RFC 4122, la variante Leach-Salz . Cette classe peut être utilisée pour d'autres variantes du modèle , mais la plupart des méthodes ne seront pas prises en charge dans 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); 

C code 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 Android pour le acceptThread (accepte les connexions), ConnectThread (complète 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 chat Bluetooth here

Answer 1

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

Vous allez 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 Documentation Android.

**

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. 

**