Advertising Bluetooth services using Symbian C++
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| − | | | + | |creationdate=May 2, 2008 |
| − | | | + | |keywords=RSdp, RSdpDatabase, TSdpServRecordHandle, RSdpDatabase::CreateServiceRecordL(), RSdpDatabase::UpdateAttributeL() |
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==Overview== | ==Overview== | ||
Revision as of 22:54, 9 October 2008
Article Metadata
Tested with
Compatibility
Article
Overview
RSdp provides a session to the Service Discovery Database. It is used to create subsessions to database functionality. A client must create and connect a session before using a RSdpDatabase subsession to access the database.
RSdpDatabase is a subsession of the SDP through which service records and their attributes can be added, deleted, and updated.
The following example shows how to advertise a certain (KBT_serviceID 0x10ff) Bluetooth service. Discovering this particular service is explained in CS9000937 - Discovering Bluetooth services.
Listening to the Bluetooth connection is explained in CS000939 - Establishing a Bluetooth connection. The channel number parameter in CMyServiceAdvertiser::StartAdvertiserL(TInt aChannel) method comes there.
MMP file
The following capabilities and libraries are required:
CAPABILITY LocalServices
LIBRARY sdpagent.lib
LIBRARY sdpdatabase.lib
Header file
#include <btsdp.h>
#include <bt_sock.h>
// The service id that identifies the service. This id will be
// used when advertising the service and discovering the service.
#define KBT_serviceID 0x10ff
// Service name and description for our service
_LIT(KBTServiceName, "BTpmp");
_LIT(KBTServiceDesc, "BTpmp");
// Service discovery protocol session
RSdp iSdp;
// Service discovery database (sdp)
RSdpDatabase iSdpDB;
// Service record
TSdpServRecordHandle iRecord;
// Service record state
TInt iRecordState;
Source file
Start the service advertiser on a given channel. Entry to service discovery database will be entered describing the advertised service.
void CMyServiceAdvertiser::StartAdvertiserL(TInt aChannel)
{
// Open sdp session
User::LeaveIfError(iSdp.Connect());
// Open sdp database session
User::LeaveIfError(iSdpDB.Open(iSdp));
// Create a record of the correct service class
TUUID serviceUUID(KBT_serviceID);
iSdpDB.CreateServiceRecordL(serviceUUID, iRecord);
// Add a protocol to the record
CSdpAttrValueDES* protocolDescriptorList = CSdpAttrValueDES::NewDESL(NULL);
CleanupStack::PushL(protocolDescriptorList);
TBuf8<1> channel;
channel.Append((TChar)aChannel);
// Create protocol list for our service
protocolDescriptorList
->StartListL() // list of protocols required for this method
->BuildDESL()
->StartListL()
->BuildUUIDL(KL2CAP)
->EndListL()
->BuildDESL()
->StartListL()
->BuildUUIDL(KRFCOMM)
->BuildUintL(channel)
->EndListL()
->EndListL();
// Set protocol list to the record
iSdpDB.UpdateAttributeL(iRecord, KSdpAttrIdProtocolDescriptorList,
*protocolDescriptorList);
CleanupStack::PopAndDestroy(protocolDescriptorList);
// Add a name to the record
iSdpDB.UpdateAttributeL(iRecord,
KSdpAttrIdBasePrimaryLanguage +
KSdpAttrIdOffsetServiceName,
KBTServiceName);
// Add a description to the record
iSdpDB.UpdateAttributeL(iRecord,
KSdpAttrIdBasePrimaryLanguage +
KSdpAttrIdOffsetServiceDescription,
KBTServiceDesc);
// Set service available
UpdateAvailabilityL(ETrue);
}
Set the availability of the advertised service. The service record on the service discovery database will be updated accordingly.
void CMyServiceAdvertiser::UpdateAvailabilityL(TBool aAvailable)
{
TInt state = aAvailable ? 0xFF : 0x00;
// Set availability
iSdpDB.UpdateAttributeL(iRecord, KSdpAttrIdServiceAvailability, state);
// Mark record changed
iSdpDB.UpdateAttributeL(iRecord, KSdpAttrIdServiceRecordState,
++iRecordState);
}
Stop advertising the service
void CMyServiceAdvertiser::StopAdvertiserL()
{
if ( iRecord!=NULL )
{
// Delete record from service discovery database
iSdpDB.DeleteRecordL(iRecord);
// Close sdp and sdp db sessions
iSdpDB.Close();
iSdp.Close();
iRecord=NULL;
}
}
Postconditions
The Bluetooth service is advertised and can be discovered as explained in CS000937 - Discovering Bluetooth services.
See also
CS000936 - Discovering Bluetooth devices
CS000937 - Discovering Bluetooth services
CS000939 - Establishing a Bluetooth connection
KIS000330 - RHostResolver and redundant display of access point selection dialog
Example application
This code snippet has been used in the S60 Platform: Bluetooth Point-to-multipoint Example application.
