Re: [Bluez-devel] dbus api

[Marcel Holtmann <marcel@holtmann.org>]

Hi Alexander,

> I'm working on a C++ library that invokes bluez over dbus. I'm currently 
> having some trouble understanding the logic of a local service. Could 
> someone explain me the way local services are managed? Like, calling 
> RegisterService() of the org.bluez.Database, what does that method do? 
> Does it create a new ServiceRecord on hciX? If so, what happens with the 
> protocol descriptors of that service record? How can I list all the 
> registered services on hciX? I see Add and Update methods for service 
> records but no ListServiceRecords()? There is a ListServices() method on 
> the manager interface but this interface is just for the /org/bluez 
> object path, so this won't give me a list just for hciX. Also, the 
> org.bluez.Service interface, does it have anything to do with 
> Add/UpdateServiceRecord() methods of the database interface? Can I 
> modify the service record (for example the protocol descriptors) of a 
> service represented by the org.bluez.Service interface?

a service and a service record are two different things.

The service is something that is BlueZ based. It normally implements one
or more profile specifications and provides a D-Bus interface to use
them.

The service record are SDP records that are mandated by the profile
specification.

You can use both independently. However both are bound to your D-Bus
connection. If you connection dies (meaning your process disconnects)
the service and also the service records will be automatically removed.

> What happened with the RFCOMM API? I agree it wasn't very nice by 
> forcing you to open /dev/tty* but it was at least something, now there 
> isn't anything dbus based. A RFCOMM API with connect(), disconnect(), 
> read() and write() will be just great (all dbus based ofcourse, no 
> /dev/tty* stuff :) ).

The RFCOMM API has been moved over to a serial service.

If you don't wanna open /dev/rfcomm* then use Bluetooth RFCOMM sockets
directly. D-Bus is not for transferring data.

Regards

Marcel



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