CODEWITHSUNDEEP
androidbluetooth
Sandrocottus
Sandrocottus

Reputation: 533

Android: Disconnection of Bluetooth for Samsung S6 (Android Version: Lollipop)

I have developed an android application on Samsung S6 mobile (Android Version:- Lollipop). The application reads data on Bluetooth port and displays on screen.

However, the Bluetooth connection is lost after sometime. After that, the Bluetooth gets connected-disconnected continuously.

The connection log is:-

03-05 15:34:57.071: E/bt-btm(6152): Reset sec_bd_name and name flag. (BR/EDR link)

03-05 15:34:57.071: E/bt-btm(6152): btm_sec_disconnected - Clearing Pending flag

invalid rfc slot id: 91

03-05 16:37:42.490: W/bt-btif(6113): dm_pm_timer expires

03-05 16:37:42.490: W/bt-btif(6113): dm_pm_timer expires 0

03-05 16:37:42.490: W/bt-btif(6113): proc dm_pm_timer expires

When i restart the mobile, everything work fine. But problem reappears again after sometime.

Why does this happen ?? How do i maintain the connection without getting disconnected ??

Edit:- I have tested my application on multiple versions of android devices and it works fine on all other devices except Samsung S6.

Upvotes: 1

Views: 451

Answers (1)

Reaz Murshed
Reaz Murshed

Reputation: 24211

Bluetooth will be disconnected automatically after a fixed period of idle time. You've nothing to do with it if you're using a regular bluetooth peripheral.

To maintain a continuous connection with bluetooth you need to check for idle time in your application and send a garbage data over your OutputStream after a fixed period of time. This is not a very good approach though, but works fine to maintain a continuous connection with bluetooth.

You can go for another approach which might freeze your application sometimes, which is creating a rfcommSocket communication each time when the bluetooth gets disconnected. You'll get a disconnection intent when your BluetoothAdapter is registered to listen bluetooth communication status. In this approach you need to know the MAC address of your bluetooth device. Here's an example how you would create the rfcommSocket communication:

private final UUID MY_UUID = UUID.fromString("00001101-0000-1000-8000-00805f9b34fb");

In your BroadcastReceiver for Bluetooth intent filters:

BluetoothDevice mDevice;
BluetoothSocket bs;

if (BluetoothDevice.ACTION_FOUND.equals(action)) {
    BluetoothDevice device = (BluetoothDevice) intent.getParcelableExtra(BluetoothDevice.EXTRA_DEVICE);

    if (device.getAddress().equals(YOUR_BT_MAC_ADDRESS)) {
        mDevice = device;
        bs = mDevice.createRfcommSocketToServiceRecord(MY_UUID);
        mBluetoothAdapter.cancelDiscovery();
    }

}

if (BluetoothDevice.ACTION_ACL_DISCONNECTED.equals(action)) {
    try {
        bs = mDevice.createRfcommSocketToServiceRecord(MY_UUID); 
    } catch (IOException e) {}
}

If this is anything about memory concern, check your InputStream and OutputStream. Read from InputStream until its not cleared.

Upvotes: 1

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