discoverServices() returning null service?

Hi. I’m facing with discoverServices() error.

BLE logs below. Just tell if You need something more… Or what is wrong in this code?

final Subscription subscription = bleDevice.establishConnection(false)
                .takeUntil(disconnectTriggerSubject)
                .flatMap(new Func1<RxBleConnection, Observable<RxBleDeviceServices>>() {
                    @Override
                    public Observable<RxBleDeviceServices> call(RxBleConnection rxBleConnection) {
                        Log.d(TAG, "BLE connection to " + bleMac + " done!");*

                    // Add this connection to a map for later use
                    connectionMap.put(bleMac, rxBleConnection);

                    return rxBleConnection.discoverServices();
                }
            })
            .map(new Func1<RxBleDeviceServices, ConnectedDevice>() {
                @Override
                public ConnectedDevice call(RxBleDeviceServices rxBleDeviceServices) {
                    Log.d(TAG, "Got service BLE from " + bleMac);

                    BluetoothGattService ngService = null;
                    for (BluetoothGattService service : rxBleDeviceServices.getBluetoothGattServices()) {
                        Log.e(TAG, "ngServices UUID: " + service.getUuid());
                        Log.e(TAG, "ngServices Instance Id: " + service.getInstanceId());
                        if (NG_SERVICE_UUID.equals(service.getUuid())) {
                            ngService = service;
                            break;
                        }
                    }

                    // If there are no proper service, just throw an error
                    if (ngService == null) {
                        throw new IllegalArgumentException("Connected device not a proper ng device");
                    }

BLE LOGS:

E/BleManager: isConnected: RxBleConnectionState{DISCONNECTED}
D/BluetoothGatt: connect() - device: E5:07:96:5E:94:CD, auto: false
D/BluetoothGatt: registerApp()
D/BluetoothGatt: registerApp() - UUID=04b2518b-01e4-4160-9296-461bfea33036
D/BluetoothGatt: onClientRegistered() - status=0 clientIf=14
D/BluetoothGatt: onClientConnectionState() - status=0 clientIf=14 device=E5:07:96:5E:94:CD
D/BleManager: BLE connection to E5:07:96:5E:94:CD done!
D/BluetoothGatt: discoverServices() - device: E5:07:96:5E:94:CD
D/BluetoothGatt: onSearchComplete() = Device=E5:07:96:5E:94:CD Status=0
D/BleManager: Got service BLE from E5:07:96:5E:94:CD
E/BleManager: Connected device not a proper ng device

[dariuszseweryn]

But you can check on the device that does not exhibit the bug if a Generic Attribute Service is discovered.

[dariuszseweryn]

Never seen this behaviour