Windows 10: Bluetooth LE device access example needed from non-UWP program

I am attempting to access data from a Bluetooth LE device from a non-UWP program. C++ old-fashioned Windows Desktop app.This should be a very simple task, and would be if the apparently-being-deprecated? Win32 API supported it.I have observed it does not: that is, here:https://github.com/MicrosoftDocs/sdk-api/blob/docs/sdk-api-src/content/bluetoothapis/nf-bluetoothapis-bluetoothfindfirstdevice.md it says:"The BluetoothFindFirstDevice function does not find Bluetooth Low Energy LE devices. To access Bluetooth LE devices, use the Windows Runtime Bluetooth Low Energy APIs. The

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Bug in windows bluetooth le GetGattServicesAsync method

The problem description:
Sometimes it is not possible to get some response from the method GetGattServicesAsync with the parameter BluetoothCacheMode.Cached or BluetoothCacheMode.Uncached. Only the windows restart helps to reconnect the le device and to get the services from the le device.

We use Windows.Devices.Bluetooth.dll with .Net Framework 4.6.1 to build the class library.
The Windows PC shall connect the Bluetooth le device.

Steps for the problem reproducing:

1. Discovery the devices with the determined service
   
2. Call the method FromBluetoothAddressAsync with the Bluetooth address of LE device
   
3. BluetoothLEDevice is found
   
4. Pair the LE device with desktop:
   
   
5. Check the connection status. If the status connected, call the method GetGattServicesAsync(BluetoothCacheMode.Cached)
   
6. Sometimes is not possible to get the response from GetGattServicesAsync. After 30 seconds we cancel the task, dispone BluetoothLEDevice, unpair and try to reconnect le device. The reconnection is failed and only the Windows restart helps to establish the connection to the le device.
   

PC:

• Dell Precision 5530
  
• Bluetooth adapter Qualcomm QCA6174A
  
• Windows 10 Enterprise (1803)
  
• Version 10.0.17134 Build 17134.590
  

LE Device:

• Bluetooth 4.2
  

 

Calling UWP Bluetooth Radio class operation in non UWP library

hi;

We have an existing WPF application that cannot be migrated to UWP. I have seen that it is possible to use UWP libraries in NON UWP projects. I was able to put together a non UWP library accessing the Radio object. Though it compiles ok I am not seeing any
Results returned. I was not able to setup the operation to use async directly. Was getting an error indicating await was not defined for the interface returned by the GetRadioAsyn() function. There is a GetResults operation on the returned result and I was
thinking this would perform an async call on the operation, but it appears not to.

I would like to know how I caould configure a NON UWP project to call the Radio class functions, and/or if it could be explained how to get async to work when including the UWP libraries (into the non UWP project).

Peter

 

Bluetooth device is shown as not present.

Hello Dominika,

Thank you for getting back to us. Since the issue still persists after following the steps on the article above, we'd like to know more. Kindly answer the following questions:

• Did you checked whether the Bluetooth device is listed under hidden devices in Device manager?
• What is the make and model of your Bluetooth device?
• Can you tell us the specific bluetooth devices that you're using on your Windows 10?
• Have you checked whether the Bluetooth driver is listed under installed programs under Programs and features?
  

Meanwhile, we suggest that you check if the Bluetooth services is enabled by following the steps below:

• Press Windows + R keys on the keyboard, type services.msc and press OK.
  
• Right click on Bluetooth Support service and select
  Restart.
  
• Right click on Bluetooth support service and select Properties
  and check if the startup type is Automatic.

We'll be waiting for your response.