https://learn.microsoft.com/en-us/uwp/api/windows.devices.bluetooth.bluetoothclassofdevice.majorclass?view=winrt-26100
BluetoothClassOfDevice.MajorClass Property (Windows.Devices.Bluetooth) - Windows apps | Microsoft...
Gets the Major Class code of the Bluetooth device.
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https://learn.microsoft.com/en-us/windows/win32/bluetooth/bluetooth-and-blob
Bluetooth and BLOB - Win32 apps | Microsoft Learn
Bluetooth uses the BLOB structure to pass or receive transport-specific data to the WSAQUERYSET structure during calls to the WSASetService or...
bluetoothblobappsmicrosoftlearn