bluetoothadvertiser.cpp

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/**
*
* @brief Definition of CBluetoothAdvertiser
*
* Copyright (c) EMCC Software Ltd 2003
* @version 1.0
*/

#include <bt_sock.h>
#include "BluetoothAdvertiser.h"
#include "BluetoothDefinitions.h"


// Constants
const TUint KStateFullyUnused = 0xFF;
const TUint KStateFullyUsed   = 0x00;

/**
* Constructor.
* Private constructor.
* @see NewL
* @see NewLC
* @param none
* @return none
**/
CBluetoothAdvertiser::CBluetoothAdvertiser()
: iRecord(0),
  iIsConnected(EFalse)
	{
	}

/**
* Destructor.
* Stop Advertising and cleanup sessions to Service Discovery Database
* @param none
* @return none
**/
CBluetoothAdvertiser::~CBluetoothAdvertiser()
	{
	if (IsAdvertising())
		{
		TRAPD(err,StopAdvertisingL());
		}

	iSdpDatabase.Close();
	iSdpSession.Close();
	}

/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L
* @param none
* @return new instance of the CBluetoothAdvertiser
*/
CBluetoothAdvertiser* CBluetoothAdvertiser::NewL()
	{
	CBluetoothAdvertiser* self = CBluetoothAdvertiser::NewLC();
	CleanupStack::Pop(self);
	return self;
	}
/**
* Factory Constructor.
* Only available way to construct class.
* This function can leave L.
* @param none
* @return new instance of the CBluetoothAdvertiser, this is also left on the cleanup stack C
*/
CBluetoothAdvertiser* CBluetoothAdvertiser::NewLC()
	{
	CBluetoothAdvertiser* self = new (ELeave) CBluetoothAdvertiser();
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}

/**
* Second Stage Constructor.
* This function can leave L
* @param none
* @see NewL
* @see NewLC
* @param none
* @return none
*/
void CBluetoothAdvertiser::ConstructL()
	{
	}

/**
* Connect Method
* If not presently connected open a session on the Service Discovery Database
**/
void CBluetoothAdvertiser::ConnectL()
	{
	if (!iIsConnected)
		{
		User::LeaveIfError(iSdpSession.Connect());
		User::LeaveIfError(iSdpDatabase.Open(iSdpSession));
		iIsConnected = ETrue;
		}
	}

/**
* Start Advertising.
* Create Service Record, add attributes, and enter into the Service Discovery Database
* @param aPort the port number to advertise
* @return none
**/
void CBluetoothAdvertiser::StartAdvertisingL(TInt aPort)
	{
	if (IsAdvertising())
		{
		// could be advertising on a different port
		StopAdvertisingL();
		}
	if (! iIsConnected)
		{
		ConnectL();
		}

	iSdpDatabase.CreateServiceRecordL(KServiceClass, iRecord);

	// add a Protocol to the record
	CSdpAttrValueDES* vProtocolDescriptor = CSdpAttrValueDES::NewDESL(NULL);
	CleanupStack::PushL(vProtocolDescriptor);

	BuildProtocolDescriptionL(vProtocolDescriptor,aPort);

	iSdpDatabase.UpdateAttributeL(iRecord, KSdpAttrIdProtocolDescriptorList, *vProtocolDescriptor);

	CleanupStack::PopAndDestroy(vProtocolDescriptor);

	// Add a name to the record
	iSdpDatabase.UpdateAttributeL(iRecord,
								  KSdpAttrIdBasePrimaryLanguage+KSdpAttrIdOffsetServiceName,
								  KServiceName);

	// Add a description to the record
	iSdpDatabase.UpdateAttributeL(iRecord,
								  KSdpAttrIdBasePrimaryLanguage+KSdpAttrIdOffsetServiceDescription,
								  KServiceDescription);
	}

/**
* Update Availability.
* Toggle function for the availability of Bluetooth Service
* @param aIsAvailable a boolean representing the availablity of the service
* @return none
**/
void CBluetoothAdvertiser::UpdateAvailabilityL(TBool aIsAvailable)
	{
	TUint state;
	if (aIsAvailable)
		{
		state = KStateFullyUnused;
		}
	else
		{
		state = KStateFullyUsed;	// Fully used -> can't connect
		}

	// Update the availibility attribute field
	iSdpDatabase.UpdateAttributeL(iRecord, KSdpAttrIdServiceAvailability, state);

	// Mark the record as changed - by increasing its state number (version)
	iSdpDatabase.UpdateAttributeL(iRecord, KSdpAttrIdServiceRecordState, ++iRecordState);
	}

/**
* Stop Advertising.
* Used when a connection is made (to avoid multiple connections) or when closing down advertiser
* @param none
* @return none
**/
void CBluetoothAdvertiser::StopAdvertisingL()
	{
	if (IsAdvertising())
		{
		iSdpDatabase.DeleteRecordL(iRecord);
		iRecord = 0;
		}
	}


/**
* Build Protocol Description.
* Builds the Data Element Sequence for the KSdpAttrIdProtocolDescriptorList attribute of Bluetooth Service record
* @param aProtocolDescriptor a pointer to the protocol descriptor to be populated with data
* @param aPort the port number to advertise
* @return none
**/
void CBluetoothAdvertiser::BuildProtocolDescriptionL(CSdpAttrValueDES* aProtocolDescriptor, TInt aPort)
	{
	TBuf8<1> channel;
	channel.Append((TChar)aPort);

	aProtocolDescriptor
	->StartListL()	// List of protocols required for this method
		->BuildDESL()
		->StartListL()	// Details of lowest level protocol
			->BuildUUIDL(KL2CAP)
		->EndListL()

		->BuildDESL()
		->StartListL()
			->BuildUUIDL(KRFCOMM)
			->BuildUintL(channel)
		->EndListL()
	->EndListL();
	}