Bluetooth Low Energy: gattCharacteristic.getDescriptor() returns null

Question

I have a problem with getting characteristic's descriptor, it always returns null. There is a chunck of my code:

public static final String CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID = "00000001-0000-1000-8000-00805f9b34fb";
public final static UUID tmp_uuid_1 = UUID.fromString(CHARACTERISTIC_UPDATE_NOTIFICATION_DESCRIPTOR_UUID);

...

BluetoothGattDescriptor descriptor = gattCharacteristic.getDescriptor(tmp_uuid_1);
descriptor.setValue(true ? BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE : new byte[]{0x00, 0x00});

I tried this on Nexus 6 with Android 5.1 and Nokia X2 DS with OS 2.0 like Android 4.3, and have a similar error.

Waiting for answers ) Thank you for your attention!

score 3 · Accepted Answer · answered Jun 03 '15 at 04:46

3

The uuid for notification descriptor is "00002902-0000-1000-8000-00805f9b34fb" instead of the "00000001-0000-1000-8000-00805f9b34fb" in your code.

answered Jun 03 '15 at 04:46

reTs

1,808
1
13
26

1

Thanks a lot ) It Works! – Jane Raid Jun 03 '15 at 10:46
I arrived here because `getDescriptor` is returning `null`. However, I am already using the correct UUID :( – me-- Jun 30 '16 at 03:38
@me-- Please ask this as a separate question. It's hard to discuss that in comments. – reTs Jul 04 '16 at 08:38

Bluetooth Low Energy: gattCharacteristic.getDescriptor() returns null

1 Answers1