FromBluetoothAddressAsync never returns to Windows 10 Creators Update in WPF app

Question

I upgraded to the official release of Windows 10, version 1703 build 15063 (Creators Update). When I run the following code in a working WPF application, BluetoothLEDevice.FromBluetoothAddressAsync never returns.

This code worked fine until my Windows 10 update (i.e. the previous 1607 compilation 14393). This code also works great if it works like UWP in the new Win 10 1703.

BluetoothLEAdvertisementWatcher BleWatcher = null;

private void Button_Click(object sender, RoutedEventArgs e)
{
     BleWatcher = new BluetoothLEAdvertisementWatcher
     {
          ScanningMode = BluetoothLEScanningMode.Active
     };
     BleWatcher.Received += Watcher_Received;
     BleWatcher.Start();
}

private async void Watcher_Received(BluetoothLEAdvertisementWatcher sender, 
                                    BluetoothLEAdvertisementReceivedEventArgs args)
{
         var device = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress);
         // never continues beyond this point above with my BTLE devices that previously worked 
}

I have completed the instructions here qaru.site/questions/1016707 / ... , to customize my desktop WPF application to use API UWP.

, WPF , Win 10 1703, exe .

- Windows 10 1703 ( UWP)?

, BluetoothAddressType.Public 2nd FromBluetoothAddressAsync, , .

var device = await BluetoothLEDevice.FromBluetoothAddressAsync(args.BluetoothAddress, BluetoothAddressType.Public);

Answer 1

, API Bluetooth 15063 ( ). :

https://social.msdn.microsoft.com/Forums/en-US/58da3fdb-a0e1-4161-8af3-778b6839f4e1/bluetooth-bluetoothledevicefromidasync-does-not-complete-on-10015063?forum=wdk#ef927009-676c-47bb-8201-8a80d2323a7f

tl; dr ++ CoInitializeSecurity . , , AppId , P/Invoke - .

, noble-uwp, ++ UWP node.js. #, , - , UWP WPF/Console/Desktop.

AppId , , .

Answer 2

, , 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!
}

GATT . cppwinrt, , , .

, API , # .

Answer 3

If you want to use CoInitializeSecurity solution in VB, here is pinvoke solution. Remember to reboot / fix all your BLE devices!

Please note that this should be the first thing to do in your code. Please note that this is NOT ALL safe.

Public Enum RpcAuthnLevel
    Default1 = 0
    None = 1
    Connect = 2
    Call1 = 3
    Pkt = 4
    PktIntegrity = 5
    PktPrivacy = 6
End Enum

Public Enum RpcImpLevel
    Default1 = 0
    Anonymous = 1
    Identify = 2
    Impersonate = 3
    Delegate1 = 4
End Enum

Public Enum EoAuthnCap
    None = &H0
    MutualAuth = &H1
    StaticCloaking = &H20
    DynamicCloaking = &H40
    AnyAuthority = &H80
    MakeFullSIC = &H100
    Default1 = &H800
    SecureRefs = &H2
    AccessControl = &H4
    AppID = &H8
    Dynamic = &H10
    RequireFullSIC = &H200
    AutoImpersonate = &H400
    NoCustomMarshal = &H2000
    DisableAAA = &H1000
End Enum

Declare Function CoInitializeSecurity Lib "ole32.dll" (pVoid As IntPtr, cAuthSvc As Integer, asAuthSvc As IntPtr, pReserved1 As IntPtr, dwAuthnLevel As Integer, dwImpLevel As Integer, pAuthList As IntPtr, dwCapabilities As Integer, pReserved3 As IntPtr) As Integer

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    CoInitializeSecurity(IntPtr.Zero, -1, IntPtr.Zero, IntPtr.Zero, RpcAuthnLevel.Default1, RpcImpLevel.Identify, IntPtr.Zero, EoAuthnCap.None, IntPtr.Zero)
    'Other code
End Sub