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POIOException: read failed, socket might closed - Bluetooth on Android 4.3
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copied!<p>Currently I am trying to deal with a strange Exception when opening a BluetoothSocket on my Nexus 7 (2012), with Android 4.3 (Build JWR66Y, I guess the second 4.3 update). I have seen some related postings (e.g. <a href="https://stackoverflow.com/questions/13648373/bluetoothsocket-connect-throwing-exception-read-failed" title="another SO questionquot;">https://stackoverflow.com/questions/13648373/bluetoothsocket-connect-throwing-exception-read-failed</a>), but none seems to provide a workaround for this issue. Also, as suggested in these threads, re-pairing does not help, and constantly trying to connect (through a stupid loop) also has no effect.</p> <p>I am dealing with an embedded device (a noname OBD-II car adapter, similar to <a href="http://images04.olx.com/ui/15/53/76/1316534072_254254776_2-OBD-II-BLUTOOTH-ADAPTERSCLEAR-CHECK-ENGINE-LIGHTS-WITH-YOUR-PHONE-Oceanside.jpg" rel="noreferrer" title="these">http://images04.olx.com/ui/15/53/76/1316534072_254254776_2-OBD-II-BLUTOOTH-ADAPTERSCLEAR-CHECK-ENGINE-LIGHTS-WITH-YOUR-PHONE-Oceanside.jpg</a>). My Android 2.3.7 phone does not have any issues connecting, and the Xperia of a colleague (Android 4.1.2) also works. Another Google Nexus (I dont know if 'One' or 'S', but not '4') also fails with Android 4.3.</p> <p>Here is the Snippet of the connection establishment. It is running in its own Thread, created within a Service.</p> <pre><code>private class ConnectThread extends Thread { private static final UUID EMBEDDED_BOARD_SPP = UUID .fromString("00001101-0000-1000-8000-00805F9B34FB"); private BluetoothAdapter adapter; private boolean secure; private BluetoothDevice device; private List<UUID> uuidCandidates; private int candidate; protected boolean started; public ConnectThread(BluetoothDevice device, boolean secure) { logger.info("initiliasing connection to device "+device.getName() +" / "+ device.getAddress()); adapter = BluetoothAdapter.getDefaultAdapter(); this.secure = secure; this.device = device; setName("BluetoothConnectThread"); if (!startQueryingForUUIDs()) { this.uuidCandidates = Collections.singletonList(EMBEDDED_BOARD_SPP); this.start(); } else{ logger.info("Using UUID discovery mechanism."); } /* * it will start upon the broadcast receive otherwise */ } private boolean startQueryingForUUIDs() { Class<?> cl = BluetoothDevice.class; Class<?>[] par = {}; Method fetchUuidsWithSdpMethod; try { fetchUuidsWithSdpMethod = cl.getMethod("fetchUuidsWithSdp", par); } catch (NoSuchMethodException e) { logger.warn(e.getMessage()); return false; } Object[] args = {}; try { BroadcastReceiver receiver = new BroadcastReceiver() { @Override 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"); uuidCandidates = new ArrayList<UUID>(); for (Parcelable uuid : uuidExtra) { uuidCandidates.add(UUID.fromString(uuid.toString())); } synchronized (ConnectThread.this) { if (!ConnectThread.this.started) { ConnectThread.this.start(); ConnectThread.this.started = true; unregisterReceiver(this); } } } }; registerReceiver(receiver, new IntentFilter("android.bleutooth.device.action.UUID")); registerReceiver(receiver, new IntentFilter("android.bluetooth.device.action.UUID")); fetchUuidsWithSdpMethod.invoke(device, args); } catch (IllegalArgumentException e) { logger.warn(e.getMessage()); return false; } catch (IllegalAccessException e) { logger.warn(e.getMessage()); return false; } catch (InvocationTargetException e) { logger.warn(e.getMessage()); return false; } return true; } public void run() { boolean success = false; while (selectSocket()) { if (bluetoothSocket == null) { logger.warn("Socket is null! Cancelling!"); deviceDisconnected(); openTroubleshootingActivity(TroubleshootingActivity.BLUETOOTH_EXCEPTION); } // Always cancel discovery because it will slow down a connection adapter.cancelDiscovery(); // Make a connection to the BluetoothSocket try { // This is a blocking call and will only return on a // successful connection or an exception bluetoothSocket.connect(); success = true; break; } catch (IOException e) { // Close the socket try { shutdownSocket(); } catch (IOException e2) { logger.warn(e2.getMessage(), e2); } } } if (success) { deviceConnected(); } else { deviceDisconnected(); openTroubleshootingActivity(TroubleshootingActivity.BLUETOOTH_EXCEPTION); } } private boolean selectSocket() { if (candidate >= uuidCandidates.size()) { return false; } BluetoothSocket tmp; UUID uuid = uuidCandidates.get(candidate++); logger.info("Attempting to connect to SDP "+ uuid); try { if (secure) { tmp = device.createRfcommSocketToServiceRecord( uuid); } else { tmp = device.createInsecureRfcommSocketToServiceRecord( uuid); } bluetoothSocket = tmp; return true; } catch (IOException e) { logger.warn(e.getMessage() ,e); } return false; } } </code></pre> <p>The code is failing at <code>bluetoothSocket.connect()</code>. I am getting a <code>java.io.IOException: read failed, socket might closed, read ret: -1</code>. This is the corresponding source at GitHub: <a href="https://github.com/android/platform_frameworks_base/blob/android-4.3_r2/core/java/android/bluetooth/BluetoothSocket.java#L504" rel="noreferrer" title="BluetoothSocket.java#L504">https://github.com/android/platform_frameworks_base/blob/android-4.3_r2/core/java/android/bluetooth/BluetoothSocket.java#L504</a> Its called through readInt(), called from <a href="https://github.com/android/platform_frameworks_base/blob/android-4.3_r2/core/java/android/bluetooth/BluetoothSocket.java#L319" rel="noreferrer" title="BluetoothSocket.java#L319">https://github.com/android/platform_frameworks_base/blob/android-4.3_r2/core/java/android/bluetooth/BluetoothSocket.java#L319</a></p> <p>Some metadata dump of the used socket resulted in the following information. These are exactly the same on Nexus 7 and my 2.3.7 phone.</p> <pre><code>Bluetooth Device 'OBDII' Address: 11:22:33:DD:EE:FF Bond state: 12 (bonded) Type: 1 Class major version: 7936 Class minor version: 7936 Class Contents: 0 Contents: 0 </code></pre> <p>I have some other OBD-II adapters (more expansives) and they all work. Is there any chance, that I am missing something or might this be a bug in Android?</p>

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