Bluetooth in WP7 [By importing COM Dll in Windows Phone 7]

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C++

C#

Windows

COM

Silverlight

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I'm trying to develop a bluetooth application in Windows Phone 7. I found WP7 doesn't provide bluetooth SDK. So I thought to implement the required functionality in C# assembly and import it in phone application.
But WP7 even doesn't allow this importing as well. So thought of to develop a COM dll in C++ and to import it in WP7 application. For POC, I developed a COM dll, and imported it in WP7 application using ComBridge object from Microsoft.Phone.InteropServices. The dll is getting loaded/registered. But when I instantiate the required coclass from the dll, it throws COMException saying 'The request is not supported.' Can somebody point out what else I could be missing?

Following is the code snippet I wrote in WP7 application.

internal static class BluetoothExports
{
    private static ICOMBluetoothServer m_iBluetoothServer;

    static BluetoothExports()
    {
        //This works fine.
        ComBridge.RegisterComDll("COMBluetooth.dll", new Guid("3A3C0E65-4ECD-4f8a-A0CC-9509C287375E"));

        //This is the point where I get exception.
        m_iBluetoothServer = new CProxyBluetoothClass() as ICOMBluetoothServer;
    }

    public static int GetDeviceName(string strDeviceName)
    {
        int retValue = 0;

        retValue = m_iBluetoothServer.GetDeviceName(strDeviceName);

        return retValue;
    }
}

public abstract class Bluetooth : IDisposable
{
    public void TestBluetooth()
    {
        string str = "";
        BluetoothExports.GetDeviceName(str);
    }

    public void Dispose()
    {
    }
}

public class CBluetooth : Bluetooth
{
}