Apps Detect Bluetooth disconnect from Scanner

[Nedals]

I have a small Android APP that connects the phone to a Scanner via Bluetooth. The APP connects and returns scan data as needed.
However, I need to be able to detect, and notify the user, when the scanner goes out of range and then auto-reconnect,
or have the user manually reconnect using a Dialog Box, when the Scanner is back in range.

I tried inserting a Timer that tries to connect every 10secs or so which opens a Dialog box
and stops the timer, but it did not work and it's real messy.

I thought there must be a simple method to do this.

Here is a truncated version of my current code

public class BluetoothListener {
    private BluetoothSocket mmSocket;  // 
    ...
    mmSocket = device.createRfcommSocketToServiceRecord(MY_UUID);
    ...
    private void connect() {
        try {
            mmSocket.connect();
            mListener = new StartListener(); mListener.start();
        }
        catch (IOException e) {
            try { mmSocket.close(); } catch (IOException ex) {}
            // Currently creates a working [reconnect]/[close] Dialog
            mHandler.obtainMessage(2, "Dialog Alert".getBytes()).sendToTarget();
        }
    }
    
    private class StartListener extends Thread {
        private final InputStream mmInStream;
        public StartListener() {
            mState = LISTENING;
            InputStream tmpIn = null;
            try {
                tmpIn = mmSocket.getInputStream();
            }
            catch (IOException e) {}
            mmInStream = tmpIn;
        }
        
        public void run() {
            try {
                InputStreamReader mReader = new InputStreamReader(mmInStream, "UTF-8");
                final BufferedReader bufferedReader = new BufferedReader(mReader);
                String line = "";
                while ((line=bufferedReader.readLine())!=null){
                    mHandler.obtainMessage(1, line.getBytes()).sendToTarget();
                }
            }
            catch (Exception e) {}
        }
        ...
    }
    ...
}