Totally Disconnect a Bluetooth Low Energy Device
<p>I connect to a BLE device with the <code>connectGatt()</code> method in Android. This works great.</p>

<p>When I disconnect I use the following:</p>

<pre><code>private void disconnectDevice() {
    gatt.disconnect();
}
</code></pre>

<p>When I receive the callback I do a close.</p>

<pre><code>private BluetoothGattCallback gattCallback = new BluetoothGattCallback() {
    @Override
    public void onConnectionStateChange(BluetoothGatt gatt, int status, int newState) {
        switch (newState) {
            case BluetoothProfile.STATE_CONNECTED:
                Log.d("BLED-GATT", "STATE_CONNECTED");
                setUIConnectionStatus("Discover services on device...", Color.YELLOW);
                checkEnableAddButton(simpleTrackEditText.getText().toString());
                gatt.discoverServices();
                break;
            case BluetoothProfile.STATE_DISCONNECTED:
                Log.d("BLED-GATT", "STATE_DISCONNECTED");
                setUIConnectionStatus("Not Connected!", Color.RED);
                gatt.close();
                break;
            default:
                Log.d("BLED-GATT", "STATE_OTHER");
        }
    }
}
</code></pre>

<p>This is executed and I can no longer control the device after calling <code>disconnectDevice()</code>. The device itself seems to think that it is still connected since I cant put it in broadcasting visibility mode (which happens if it already has a connection). However, if I kill the application and open it again then I can set the device in broadcasting mode. This tells me the app was not properly disconnected.</p>

<p>Any idea what I missed here? </p>