Android Bluetooth Connection - Service Discovery Failed

Question

I'm trying to create a basic bluetooth application, for testing the device.

I got the code from developer.android. Here is the link : http://developer.android.com/guide/topics/connectivity/bluetooth.html#ConnectingDevices

Here is run part of my thread code:

     public void run() {

        mBluetoothAdapter.cancelDiscovery();
        Log.i(TAG, "Discovery Cancel!"); 

        try {
            Log.i(TAG, "Connection Started");
            mmSocket.connect();
            Log.i(TAG, "Connection Ended");
        } catch (IOException e) {
            try {
                Log.e(TAG, "Connection Failed", e);
                mmSocket.close();
            } catch (IOException e2) {
                Log.e(TAG, "Connection Close Failed", e2);
            }
            return;
        }

Whatever I have tried mmSocket.connect(); never works. Always throws an IOException and I get that log from my logcat:

java.io.IOException: Service discovery failed
at android.bluetooth.BluetoothSocket$SdpHelper.doSdp(BluetoothSocket.java:403)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:213)

I've looked at these articles, and tried the written things, none of them has solved my problem.

Android Bluetooth: Service Discovery Failed, connection to Desktop/Laptop

Service discovery failed exception using Bluetooth on Android

Bluetooth connection on Android ICS not possible

Android Bluetooth java.io.IOException: Connection refused?

Btw I'm working on android ics 4.0.4.

I know that is not device problem, cause I've tried this app on different devices.

Answer 1

I don't know and I still don't understand the UUID stuff but the problem was the UUID. I'm using the UUID which I got from the kernel logs and it is 00001105-0000-1000-8000-00805F9B34FB.

Answer 2

Its working for me

BluetoothSocket socket = device.createInsecureRfcommSocketToServiceRecord(MY_UUID);
Method m = device.getClass().getMethod("createInsecureRfcommSocket", new Class[] {int.class});
socket = (BluetoothSocket) m.invoke(device, 1);
bluetoothAdapter.cancelDiscovery();
socket.connect();

Answer 3

The following code snippet works for me. Try it...

BluetoothDevice mmDevice;
boolean temp = mmDevice.fetchUuidsWithSdp();
UUID uuid = null;
if( temp ){
uuid = mmDevice.getUuids()[0].getUuid();
}
tmp = device.createRfcommSocketToServiceRecord(uuid);

Answer 4

I worked through a similar learning process. I have tried to document what I learned in a series of examples.

This one might be of help:

http://digitalhacksblog.blogspot.com/2012/05/android-example-bluetooth-simple-spp.html

It is for setting up a simple connection between an Android device and a PC via bluetooth. The examples contain the Android files as well as an SPP server in java and one in perl for the PC.

Hope this helps.

Answer 5

Make sure that your app is not trying to connect while the adapter is busy with discovery: It appears the problem was that before I called

clientSocket.connect()

I needed to call

btAdapter.cancelDiscovery()

This helped solve the same problem for me Matts Reco