// ...

#include <bt_api.h>
//...

/****************************************************************
* FUNCTION: CreateDevice
* DESC: Creates Bluetooth virtual COM ports for outgoing/incoming. 
*		This method uses Microsoft's BTD library. 
* RFCOMM connections.
* PARAMS:
*	nPortIndex - Unused port index
*	nRfChannel - RF Channel corresponding to the port to be created
*				(Note that a channel services a particular RF connection)
*	pAddr - If not NULL, client COM port is created and attempts to make
*			connection with this Bluetooth peer device.
*****************************************************************/
BOOL CreateDevice( UINT nPortIndex, UINT nRfChannel, BT_ADDR* pAddr /* = NULL */ )
{
	WCHAR szErrW[256];
	int rfChannel = 0;

	PORTEMUPortParams pp;
	ZeroMemory (&pp, sizeof(PORTEMUPortParams));

	// Verify channel supplied is okay or not
	if ( nRfChannel != 0 ) {
		if ( (nRfChannel <= 31) && (nRfChannel >= 1) )
			rfChannel = (unsigned char)nRfChannel; // Default overriden by user
		else {
			wsprintf (szErrW, L"User supplied RfChannel is invalid");
			MessageBox( NULL, szErrW, L"LwVirtualCom", MB_OK );

			return FALSE;
		}
	}
	else {
		rfChannel = DEFAULT_RFCOMM_CHANNEL;
	}

	if (!pAddr) {
		// Following, required for server port
		pp.flocal = TRUE; // This enables a server COM port to accept incoming connections
		pp.channel = rfChannel & CHANNEL_MASK; // The server channel is specified explicitly by setting channel. 
	}
	else {
		// Following, required for client port
		CopyMemory(&pp.device, pAddr, sizeof(BT_ADDR));

		pp.imtu = DEFAULT_MTU;
		pp.channel = rfChannel & CHANNEL_MASK;
		pp.uiportflags = 0; //RFCOMM_PORT_FLAGS_REMOTE_DCB;
	}

	// Register the Bluetooth Protocol stack with the virtual COM port
	hDevice = RegisterDevice (L"COM", nPortIndex, L"btd.dll", (DWORD)&pp);
	if (hDevice == NULL) {
		wsprintf (szErrW, L"RegisterDevice failed, error = %d\n", GetLastError ());
		//POPMSG(szErrW);
		MessageBox( NULL, szErrW, L"LwVirtualCom", MB_OK );

		return FALSE;
	}

	return TRUE;	
}

VOID RemoveDevice()
{
	if (hDevice) {
		// Ensure that COM port is not in service first
		//..
		//..

		DeregisterDevice(hDevice);
		hDevice = NULL;
	}
}