FromBluetoothAddressAsync never returns on Windows 10 Creators Update in WPF Application

Question

I upgraded to Windows 10, version 1703 build 15063 (Creators Update) official release. When I run the following code in a WPF desktop application, BluetoothLEDevice.FromBlue

Answer 1

Interestingly, it does work on desktop applications using cppwinrt:

Advertisement::BluetoothLEAdvertisementWatcher watcher;

void Start() {
    watcher.ScanningMode(Advertisement::BluetoothLEScanningMode::Active);
    Windows::Foundation::TimeSpan timeout = std::chrono::seconds(2);
    watcher.SignalStrengthFilter().OutOfRangeTimeout(timeout);
    watcher.SignalStrengthFilter().OutOfRangeThresholdInDBm(-90);

    watcher.Received([&](Advertisement::BluetoothLEAdvertisementWatcher watcher, Advertisement::BluetoothLEAdvertisementReceivedEventArgs eventArgs) {
        connect(eventArgs.BluetoothAddress());
    });
    watcher.Start();
}

Windows::Foundation::IAsyncAction connect(uint64_t uuid) {
    co_await resume_background();
    BluetoothLEDevice device = co_await BluetoothLEDevice::FromBluetoothAddressAsync(uuid);
    GenericAttributeProfile::GattDeviceServicesResult gatt = co_await device.GetGattServicesForUuidAsync(myServiceUUID);
    // works fine!
}

However, notifications for GATT characteristics don't work for me after that. I have filed a bug report with the cppwinrt project, but the devs don't seem to be particularly inclined to look into it.

I have no idea what that API is doing differently than the desktop C# version.