Re: [Bluez-devel] SDP over XML

[Marcel Holtmann <marcel@holtmann.org>]

Hi Denis,

> > any SDP record registration will have to go over D-Bus in the future and
> > it will come along with the service registration feature. However none
> > of this has been set into to stone yet.
> 
> I'd be very interested in learning what has been proposed so far for doing 
> this.  We'd be very much interested in a flexible architecture, allowing us 
> to specify dynamic records.  E.g. things like Handsfree profile requires SDP 
> records with supported features attributes.  This is something that we just 
> cannot do currently with the existing infrastructure.

at the moment these are only ideas and quite frankly most of them
spinning somewhere in my head only. I hope that in the next few couple
of weeks, we get them down to a written API and can start implementing
prototypes for it.

> > The RegisterService... part is under discussion at the moment and I have
> > no idea how the final outcome will look like. I am okay with having an
> > additional method that returns the SDP service record in XML format, but
> > first you would have to define the DTD for it and we have to agree on
> > it.
> 
> I shall work on forming a DTD.  It most likely will closely follow the BlueZ 
> type structure.  Should I work on the patch for registering/unregistering XML 
> SDP records against hcid as well?

If you wanna go that way, then we first need a DTD and don't follow the
BlueZ source code. You should follow the Bluetooth specification. The
SDP implementation of BlueZ is not one of the best examples and might be
replaced at some point anyway.

> > > Additionally, a lot of the code that is currently in sdptool.c could be
> > > refactored into XML files, and it would be much more trivial to add new
> > > profiles (e.g. as an XML template instead of a function inside sdptool)
> >
> > The record add function of sdptool is actually more a development thing,
> > than something you should use in real applications. However I am against
> > adding a dependency on a XML parsing library to sdptool.
> 
> I completely agree.  However, up to this point sdptool has been the only way 
> to develop "real applications."  Using sdp library directly is not an option 
> for us.  

Nobody should have to use it directly. It is actually a mess and the
potential of memory leaks are way to big. However we first need a clean
D-Bus API before I start thinking about replacing or rewriting it.

Regards

Marcel



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