Question

I’m looking for a way to determine if a COM is a standard COM or if it’s an SPP COM, also known as a cable replacement bluetooth adapter for a COM device.

I have a device which works both in USB (COM -> USB) and Bluetooth, and the Bluetooth interface works with SPP.

I am currently using System.IO.Ports.SerialPort.GetPortNames() to get the COMs.

Is there a way to determine whether or not it’s a connected with Bluetooth or USB?

SOLUTION:

System.Management.ManagementObjectSearcher Searcher = new System.Management.ManagementObjectSearcher("Select * from WIN32_SerialPort");
foreach (System.Management.ManagementObject Port in Searcher.Get())
{
    foreach (System.Management.PropertyData Property in Port.Properties)
    {
        Console.WriteLine(Property.Name + " " + (Property.Value == null ? null : Property.Value.ToString()));
    }
}

And the output is something similar:

Availability 2
Binary True
Capabilities 
CapabilityDescriptions 
Caption Standard Serial over Bluetooth link (COM10)
ConfigManagerErrorCode 0
ConfigManagerUserConfig False
CreationClassName Win32_SerialPort
Description Standard Serial over Bluetooth link
DeviceID COM10
ErrorCleared 
ErrorDescription 
InstallDate 
LastErrorCode 
MaxBaudRate 9600
MaximumInputBufferSize 0
MaximumOutputBufferSize 0
MaxNumberControlled 
Name Standard Serial over Bluetooth link (COM10)
OSAutoDiscovered True
PNPDeviceID BTHENUM\{00001101-0000-1000-8000-00805F9B34FB}_LOCALMFG&0000\8&3062A492&0&000000000000_0000001C
PowerManagementCapabilities System.UInt16[]
PowerManagementSupported False
ProtocolSupported 
ProviderType RS232 Serial Port
SettableBaudRate True
SettableDataBits True
SettableFlowControl True
SettableParity True
SettableParityCheck False
SettableRLSD True
SettableStopBits True
Status OK
StatusInfo 3
Supports16BitMode False
SupportsDTRDSR True
SupportsElapsedTimeouts True
SupportsIntTimeouts True
SupportsParityCheck False
SupportsRLSD True
SupportsRTSCTS True
SupportsSpecialCharacters False
SupportsXOnXOff False
SupportsXOnXOffSet False
SystemCreationClassName Win32_ComputerSystem
SystemName JVALDRON-PC
TimeOfLastReset 

Answer 1

You are unable to find this information out via the SerialPort class. You would need to do a WMI query.

Doing something along the lines of this may lead you to it

ManagementObjectSearcher searcher = new ManagementObjectSearcher("Select * 
                                      from WIN32_SerialPort");

foreach(ManagementObject Port in searcher.Get()) {

       string a = (string) Port.GetPropertyValue("Name");

}

I haven’t got this code loaded so I don’t know what further properties you can obtain. However if there was anyway, WMI would be the way to do it.