Linux Bluetooth UUIDを使用してAndroidサービスを見つけていません
https://stackoverflow.com/questions/4053441
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Gumstix（Linux）を実行している組み込みシステムにプログラムを作成して、Bluetooth上のAndroid 2.xデバイスに接続して話し合います。 Gumstixはクライアントであり、Androidはサーバーです。 Androidサービスが使用するチャネル番号を見つけようとしているため、Gumstixが接続できるようにしますが、何らかの理由で、私のルーチンは、一致するUUIDのあるサービスを見つけられないように見えるため、チャネル番号を返していません。
Gumstixルーチンに提供されたUUIDとAndroidデバイスのUUIDは、実際には同じ数ではないと思います。 Androidには128ビットUUIDが必要です。
から Androidドキュメント:
UUIDは、128ビットの普遍的に一意の識別子（UUID）の不変の表現です。
UUIDには複数のバリアントレイアウトがありますが、このクラスは、リーチサルツバリアントであるRFC 4122のバリアント2に基づいています。このクラスは、代替バリアントをモデル化するために使用できますが、ほとんどの方法はこれらの場合にはサポートされていません。の各方法を参照してください
Androidで使用されるuuid：
public static final String UUID_STRING = "00000000-0000-0000-0000-00000000ABCD";
private static final UUID MY_UUID = UUID.fromString(UUID_STRING);
GumstixのCコード 失敗する場所を示すコメントを探してください
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;
}
編集：
AcceptThread（接続をAcceptsS）、ConnectThread（接続の完了）、ConnectedThread（接続を維持し、ハンドラーを確立する）のAndroidコード
/**
* 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;
}
}
}
AndroidコードはBluetoothチャットの例から採用されました ここ
解決
Androidデバイスで実行されているuuid {0、0、0、0xabcd}を使用して、uuid {0、0、0、0xabcd}を使用したサービス（通常はrfcomm/sppを超えて）はありますか？
おそらく（指定されたUUIDを使用してプログラムでサービスを作成し、デバイスで実行して接続できるようにします。
Androidドキュメントからの引用：
**
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.
**
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