Android Bluetooth Connection Secure Insecure

android bluetooth connection cyanogenmod
DarkRyuu picture DarkRyuu · Nov 27, 2011 · Viewed 12.1k times · Source

I have been playing around with the bluetooth API for Android 2.2 (API level 8, HTC Desire) and had an app connecting to an embedded Bluetooth device using:

device.createRfcommSocketToServiceRecord(DEV_UUID);

This generated a pairing request as expected, however to streamline the connection process I wanted to avoid the user interaction when pairing so moved to API level 10 (HTC Desire with CyanogenMod 7) so I could use:

 device.createInsecureRfcommSocketToServiceRecord(DEV_UUID);

When testing this also works as expected (connecting without prompting the user to pair), however when I try to create the secure RfcommSocket under API level 10 as before with 2.2 I get a connection refused exception...

 java.io.IOException: Connection refused
    at android.bluetooth.BluetoothSocket.connectNative(Native Method)
    at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:204)

As far as I can tell this should still work in the same way, prompting the user to pair?

EDIT:

Just tried again using the following code and the outcome is the same (working for insecure but not for secure), I will try and get my hands on a stock 2.3 device to test on. 

        try {
            Method m = dev.getClass().getMethod("createInsecureRfcommSocketToServiceRecord", new Class[] { UUID.class } );
            BluetoothSocket bs = (BluetoothSocket)m.invoke(dev, devUUID);
            Log.d("TEST", "Method Invoked");
            bs.connect();
            Log.d("TEST", "Connected to socket");
            bs.close();
            Log.d("TEST", "Closed Socket");
        }

Answer

Sourab Sharma picture Sourab Sharma · Dec 28, 2011

While looking for the solution of similar problem in my app, I have found this blog from code.google.com

It will help all those who are still looking for this problem solution on SO

http://mobisocial.stanford.edu/news/2011/03/bluetooth-reflection-and-legacy-nfc/ (link not working anymore)

The solution has become very simple now. Just include InsecureBluetooth.java in your project and change 2 lines in BluetoothChatService.java. 

tmp = InsecureBluetooth.listenUsingRfcommWithServiceRecord(mAdapter, NAME, MY_UUID, true);

and 

tmp   = InsecureBluetooth.createRfcommSocketToServiceRecord(device, MY_UUID, true);

Thats it !

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