Problems with BT service discovery

[alberto.cruz]

Hello!

I am trying to develop a simple Bluetooth service discovery. I've taken code from Bluetooth Point to Multipoint example. I've changed the UUID in order to search for RFCOMM services.

The result is always the same, no found services. I've tried to search other UUIDs (L2CAP, SerialPortUUID,...), but the result is always the same. The most surprising thing is that listener methods are not executed.

My first thought was that the MAC addresses obtained in the device discovery process were wrong or missmatched, but I've checked them, and they aren't wrong.

Could anybody help me?
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void CServiceDiscoverer::DiscoverServicesOnDevice(TDeviceData* aDevData)
	{
	FinishDiscovery();

	iDevDataChanged = EFalse;
	iDevData = aDevData;
	TBuf<20> address;
	iObserver.printMessage(iDevData->iDeviceName);
	iDevData->iDeviceAddr.GetReadable(address);
	iObserver.printMessage(address);

	// init new service discovery agent
	iAgent = CSdpAgent::NewL(*this, iDevData->iDeviceAddr);
	// set search properties for agent
	iSpat = CSdpSearchPattern::NewL();
	// use our service id to filter the services discovered
	// -> will return only the services with matching service id(s)

	TUUID service(KRFCOMM);


	//service = KL2CAP;
	iSpat->AddL(service);

	//service = KSerialPortUUID;
	//iSpat->AddL(service);

	iAgent->SetRecordFilterL(*iSpat);

	// initiate search
	// this will result in call to NextRecordRequestComplete()
	
	iAgent->NextRecordRequestL();
	iRunning = ETrue;
	}

Thanx.

[symbianyucca]

have you tried what if the original example works ?

And if it does, try doing all your modification, one-by-one, and check that it works after each modifications, and when it stops working, you have found your bug.

[alberto.cruz]

Thnkx, it was a good advice,

I`ve just tried to execute the example in a Nokia N95 8GB and in a Nokia E61 and it hasn't work. Both mobiles are unable to find each other services.

Anybody has tried and succeed?

Thank you.

[k4l4]

But the phones discover each other as devices? Only the service discovery fails?

[alberto.cruz]

Hi!

First of all, thank you.

Device Discovery works perfectly. They discover each other as devices, their fiendly names and their addresses.
I haven´t had any other problem but the service discovery. I've succeed connecting devices, advertising bluetooth services, discovering devices; but I'm not able to discover services.

I'm a bit frustrated.

[alberto.cruz]

Hi All!!

I'm just solved the problem. The example didn't work because of its capabilities; ReadDeviceData must be declared at.mmp file.

Thnaks!

[wizard_hu_]

That would be surprising. ReadDeviceData is about reading "settings" of your own device. BT service discovery is about reading something from another device. Where the another device is not necessarily Symbian at all. And vice versa.