Windows 10: Why do Bluetooth LE / BLE Midi Controllers not work in Windows 11 any longer WIn11 Home...

Just today I tried a few MIDI controllers with BLE, on WIndows 11 Home with latest stable updates.Roland A-01Yamaha MD-BT01Yamaha UD-BT01They all do not work properly in WIndows 11. WOrked fine in WIndows 10.They get reconized and paired, but immediately after connection is terminated and cannot be started manually.Oh boy Microsoft, you did it again. Break something that was working perfectly. You ARE against mobile musicians, right?NO, I am not the only one with those issues, see e.g. https://answers.microsoft.com/en-us/windows/forum/all/bluetooth-ble-doesnt-work-properly-on-windows-11/1bedd9

:)

 

Windows 10 BLE WPF - ValueChanged no longer works in 1809

I have a WPF BLE Central application (not UWP) that used to work in Windows 10, 1803 connected to Nordic NRF52 processor.

The issue is the code below no longer generates event.

aCharacteristic.ValueChanged += char_ValueChanged_Notification;

I am not using any pairing or bonding currently. Below is high level summary of the BLE code.

aBleDevice = await BluetoothLEDevice.FromBluetoothAddressAsync(blueToothAddr);

var gatt = await aBleDevice.GetGattServicesAysnc();

// For each of the service found, get the Characteristics

var charResult await service.GetCharateristicsAsync();

// For each characteristic that I want to be notified, I have code below generated event in 1803, but no longer works in 1809 or in 1903.

aCharacteristic.ValueChanged += char_ValueChanged_Notification;

Any suggestions on how to make it work in 1809 and later? It appears to be related to security issue change(?) that prevents reading / receiving data from the BLE Peripheral?

 

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
  

 

Bluetooth LE Enumerator is Missing

Sometimes, when i want to add my PS4 Controller to play Minecraft Windows 10 Edition, the "Wireless Controller" (DualShock 4) device doesn't appear despite enabling the "Pair" Function on the Controller (by holding SHARE + PS), i went to check the Device
Manager, and found out that "Microsoft Bluetooth LE Enumerator" is missing on the list, only "Microsoft Bluetooth Enumerator" appears.

The Bluetooth LE Enumerator is what works as the Device Detector, and i can't find a way to re-install it.