[DllImport("coredll.dll", SetLastError = true)]
        private static extern IntPtr RegisterDevice(
            string lpszType,
            int dwIndex,
            string lpszLib,
            ref PORTEMUPortParams dwInfo);

        [StructLayout(LayoutKind.Sequential)]
        internal struct PORTEMUPortParams
        {
            internal int channel;
            [MarshalAs(UnmanagedType.Bool)]
            internal bool flocal;
            internal long device;//10
            internal int imtu;
            internal int iminmtu;
            internal int imaxmtu;
            internal int isendquota;
            internal int irecvquota;
            internal Guid uuidService;//16
            internal RFCOMM_PORT_FLAGS uiportflags;
        }