Android中串連藍牙裝置時遇到createRfcommSocketToServiceRecord的UUID問題和BluetoothSocket的connect失敗

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【問題】

折騰：

【記錄】編寫Android中的藍芽模組驅動和底層HART裝置

期間，參考：

Bluetooth | Android Developers – ManagingAConnection

參考“Connecting as a client”中的：

tmp = device.createRfcommSocketToServiceRecord(MY_UUID);

遇到UUID不懂的問題。

然後隨便去

http://www.guidgenerator.com/online-guid-generator.aspx

弄了個UUID：

e214d9ae-c3ba-4e25-abb5-299041353bc3

結果運行到：

            try {                // Connect the device through the socket. This will block                // until it succeeds or throws an exception                mmSocket.connect();            } catch (IOException connectException) {                // Unable to connect; close the socket and get out                try {                    mmSocket.close();                } catch (IOException closeException) { }                return;            }

中的：

mmSocket.connect(); 

時就拋異常了。

即：

遇到createRfcommSocketToServiceRecord的UUID不懂，以及BluetoothSocket的connect失敗。

 

【解決過程】

1.參考：

android – Why can’t HTC Droid running OTA 2.1 communicate with RFCOMM? – Stack Overflow

去試試：

Method m = device.getClass().getMethod("createRfcommSocket", new Class[] {int.class});mBTSocket = (BluetoothSocket) m.invoke(device, 1);

結果看著就不太對啊。。就不繼續試了。

2.參考：

Need Bluetooth UUID clarification – Google Groups

去試試：

00001101-0000-100­0-8000-00805F9B34FB

結果直接掛掉。

3.再去試試：

00000003-0000-100­0-8000-00805F9B34FB

也會掛掉。

4.後來再去搜：

android bluetooth connect fail

然後去參考：

android bluetooth can’t connect – Stack Overflow

和：

The Missing Manual: Android Bluetooth RFCOMM « Wires Are Obsolete

去試試，用代碼：

 // Create a BroadcastReceiver for ACTION_FOUND private final BroadcastReceiver mReceiver = new BroadcastReceiver() {     public void onReceive(Context context, Intent intent) {// BluetoothDevice deviceExtra = intent.getParcelableExtra("android.bluetooth.device.extra.DEVICE");// Parcelable[] uuidExtra = intent.getParcelableArrayExtra("android.bluetooth.device.extra.UUID");         String action = intent.getAction();         // When discovery finds a device         if (BluetoothDevice.ACTION_FOUND.equals(action)) {             // Get the BluetoothDevice object from the Intent             BluetoothDevice btDev = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);             Parcelable[] btDevUuid = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);

調試得到的btDevUuid都是null的。

5.換用：

         if (BluetoothDevice.ACTION_FOUND.equals(action)) {             // Get the BluetoothDevice object from the Intent             BluetoothDevice btDev = intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);             //Parcelable[] btDevUuid = intent.getParcelableArrayExtra(BluetoothDevice.EXTRA_UUID);             UUID btDevUuid = intent.getParcelableExtra(BluetoothDevice.EXTRA_UUID);

還是不行。

6.參考：

Issue 15919 – android – Bluetooth connect fails under 2.3.3 for SPP devices using secure comms

中提到的：

BluetoothDevice | Android Developers

中提示的：

Hint: If you are connecting to a Bluetooth serial board then try using the well-known SPP UUID 00001101-0000-1000-8000-00805F9B34FB. However if you are connecting to an Android peer then please generate your own unique UUID.

所以再去試試這個UUID：

00001101-0000-1000-8000-00805F9B34FB

最終是可以了：

對應的相關代碼為：

 private String mactekHartModemName; private UUID mactekHartModemUuid;     //void afterFoundBtHartModem(BluetoothDevice btDev, Parcelable[] btDevUuid){ void afterFoundBtHartModem(BluetoothDevice btDev, UUID btDevUuid){  if(null != btDevUuid){        }       //mactekHartModemName = btDev.getName(); //"MACTekViator75FE"     //mactekHartModemUuid = UUID.fromString(mactekHartModemName);    String uuidValue;  //http://www.guidgenerator.com/online-guid-generator.aspx  //uuidValue = "e214d9ae-c3ba-4e25-abb5-299041353bc3";    //https://groups.google.com/forum/#!topic/android-developers/vyTEJOXELos  //uuidValue = "00001101-0000-100­0-8000-00805F9B34FB";  //uuidValue = "00000003-0000-100­0-8000-00805F9B34FB";  uuidValue = "00001101-0000-1000-8000-00805F9B34FB";  mactekHartModemUuid = UUID.fromString(uuidValue);     ConnectThread connectBtThread = new ConnectThread(btDev);     connectBtThread.start(); }    private class ConnectThread extends Thread {        private final BluetoothSocket mmSocket;        private final BluetoothDevice mmDevice;             public ConnectThread(BluetoothDevice device) {            // Use a temporary object that is later assigned to mmSocket,            // because mmSocket is final            BluetoothSocket tmp = null;            mmDevice = device;                 // Get a BluetoothSocket to connect with the given BluetoothDevice            try {                // MY_UUID is the app‘s UUID string, also used by the server code                tmp = device.createRfcommSocketToServiceRecord(mactekHartModemUuid);//00001101-0000-1000-8000-00805F9B34FB            } catch (IOException e) { }            mmSocket = tmp;        }             public void run() {            // Cancel discovery because it will slow down the connection            mBluetoothAdapter.cancelDiscovery();                 try {                // Connect the device through the socket. This will block                // until it succeeds or throws an exception                mmSocket.connect();            } catch (IOException connectException) {                // Unable to connect; close the socket and get out                try {                    mmSocket.close();                } catch (IOException closeException) { }                return;            }                 // Do work to manage the connection (in a separate thread)            manageConnectedSocket(mmSocket);        }             /** Will cancel an in-progress connection, and close the socket */        public void cancel() {            try {                mmSocket.close();            } catch (IOException e) { }        }    }

 

【總結】

此處，必須使用Android的SSP（協議棧預設）的UUID：

00001101-0000-1000-8000-00805F9B34FB

才能正常和外部的，也是SSP串口的藍牙裝置去串連。

Android中串連藍牙裝置時遇到createRfcommSocketToServiceRecord的UUID問題和BluetoothSocket的connect失敗