I have the following setup:
The Android device uses the Client socket to connect to the remote embedded device. The Android application uses the following code snippet to connect to the embedded device.
The embedded device uses the BTW MindTree stack, where the server serial socket is prepared in accordance with some properties on the device that the Android application is familiar with, the connection defined on the embedded device is not secure !!
The combination of both applications works on:
- 2 LG phones different models (version code <10 uses the "Normal Method" )
- 2 different HTC models (version code <10 uses the Workaround method )
- Pantech Tablet (version code <13 uses the workaround )
Today I tried the application on Samsung S3, Motorola MB886 and Nexus 7 ... Everyone caused a "Failure Resolution" when calling socket.connect () ... (I have the appropriate permissions in the manifest, otherwise it will not work on other devices. )
All the new devices I've tested on are version> 4.0 code, so I'm curious:
Does anyone know of any changes to the API? Perhaps Android 4.0+ provides security?
It seems that the error occurs in the Bonding state, as I see in the built-in program logs ...
Any ideas?
The code:
public final synchronized int connectToDevice(int connectingMethod)
throws BluetoohConnectionException {
if (socket != null)
throw new BadImplementationException("Error socket is not null!!");
connecting = true;
logInfo("+---+ Connecting to device...");
try {
lastException = null;
lastPacket = null;
if (connectingMethod == BluetoothModule.BT_StandardConnection
|| connectingMethod == BluetoothModule.BT_ConnectionTBD)
try {
socket = fetchBT_Socket_Normal();
connectToSocket(socket);
listenForIncomingSPP_Packets();
onConnetionEstablished();
return BluetoothModule.BT_StandardConnection;
} catch (BluetoohConnectionException e) {
socket = null;
if (connectingMethod == BluetoothModule.BT_StandardConnection) {
throw e;
}
logWarning("Error creating socket!", e);
}
if (connectingMethod == BluetoothModule.BT_ReflectiveConnection
|| connectingMethod == BluetoothModule.BT_ConnectionTBD)
try {
socket = fetchBT_Socket_Reflection(1);
connectToSocket(socket);
listenForIncomingSPP_Packets();
onConnetionEstablished();
return BluetoothModule.BT_ReflectiveConnection;
} catch (BluetoohConnectionException e) {
socket = null;
if (connectingMethod == BluetoothModule.BT_ReflectiveConnection) {
throw e;
}
logWarning("Error creating socket!", e);
}
throw new BluetoohConnectionException("Error creating RFcomm socket for BT Device:" + this
+ "\n BAD connectingMethod==" + connectingMethod);
} finally {
connecting = false;
}
}
protected void onConnetionEstablished() {
logInfo("+---+ Connection established");
}
private synchronized void listenForIncomingSPP_Packets() {
if (socketListeningThread != null)
throw new BadImplementationException("Already lisening on Socket for BT Device" + this);
logInfo("+---+ Listening for incoming packets");
socketListeningThread = new Thread(socketListener, "Packet Listener - " + bluetoothDevice.getName());
socketListeningThread.start();
}
private BluetoothSocket fetchBT_Socket_Normal()
throws BluetoohConnectionException {
try {
logInfo("+---+ Fetching BT RFcomm Socket standard for UUID: " + uuid + "...");
return bluetoothDevice.createRfcommSocketToServiceRecord(UUID.fromString(uuid));
} catch (Exception e) {
throw new BluetoohConnectionException("Error Fetching BT RFcomm Socket!", e);
}
}
private BluetoothSocket fetchBT_Socket_Reflection(int connectionIndex)
throws BluetoohConnectionException {
Method m;
try {
logInfo("+---+ Fetching BT RFcomm Socket workaround index " + connectionIndex + "...");
m = bluetoothDevice.getClass().getMethod("createRfcommSocket", new Class[]{int.class});
return (BluetoothSocket) m.invoke(bluetoothDevice, connectionIndex);
} catch (Exception e) {
throw new BluetoohConnectionException("Error Fetching BT RFcomm Socket!", e);
}
}
private void connectToSocket(BluetoothSocket socket)
throws BluetoohConnectionException {
try {
logInfo("+---+ Connecting to socket...");
socket.connect();
logInfo("+---+ Connected to socket");
} catch (IOException e) {
try {
socket.close();
} catch (IOException e1) {
logError("Error while closing socket", e1);
} finally {
socket = null;
}
throw new BluetoohConnectionException("Error connecting to socket with Device" + this, e);
}
}