DeviceInformation.FindAllAsync(SerialDevice.GetDeviceSelector()) Portname is empty - vb.net

Question

I am trying to get the Portname of some working USB-to-Serial adapters connected to a Windows IoT RPi unit. I am still able to open and I am getting an instantiated serialDevice that works. I am able to send and receive data on the port but the PortName object is showing "" so I have no idea if its COM1 or COM2 etc. This would not be a problem except that I am connecting multiple adapters and need a way to identify the adapter uniquely. Anyone else seeing this?
The code I am using to query and open the ports is:
Dim dis = Await DeviceInformation.FindAllAsync(SerialDevice.GetDeviceSelector())
Dim Count As Integer = 0
Do Until Count = dis.Count
Debug.WriteLine("UART Port: " & dis(Count).Name & ", " & dis(Count).Id)
If dis(Count).Id.Contains("FTDI") Or dis(Count).Id.Contains("FT232") Then
serialPort = Await SerialDevice.FromIdAsync(dis(Count).Id)
End If
Count += 1
Loop

Answer 1

You can get a valid SerialDevice.PortName on Desktop but not on Windows IoT Core device. Assigning a COM number to a serial device need system-supplied function driver like Serial.sys etc. But these drivers not provided on Windows IoT Core device. You can check it under C:\Windows\System32\drivers path.
To identify multiple devices, there is a workaround that using VID(vendor ID) and PID(product ID). They are considered unique.
So instead of SerialDevice.GetDeviceSelector() you can use SerialDevice.GetDeviceSelectorFromUsbVidPid(vid, pid). You can find VID and PID in DeviceInformation.Id. It will like this:
\\?\USB#VID_10C4&PID_EA60#0001#{86e0d1e0-8089-11d0-9ce4-08003e301f73}