Re: [Bluez-devel] [PATCH] implement RFCOMM Connect and Disconnect methods

[Marcel Holtmann <marcel@holtmann.org>]

Hi Matthew,

> > thanks for the patch, but what is the problem with sticking to Connect
> > and CancelConnect and use their service string to identify UUID, handle
> > or service name bases connections.
> 
> I'm not quite clear on what you mean here. The service string seems 
> unacceptable because it requires bluez to have a table of every possible 
> service and UUID in existence. Or are we talking about different things? 
> Right now, the API gives us the following things that potentially 
> identify an object:
> 
> 1) The identifiers returned by GetIdentifiers (currently an arbitrary 
> but unique integer, despite dbus-api.txt claiming it returns strings)
> 2) The UUID
> 3) The service handle
> 4) The ascii service string
> 
> My implementation provides connect methods for (2), (3) and (4). You 
> didn't seem too happy about my patch providing support for (1), so I've 
> dropped it :) Or do you just mean that there should be a single method 
> and it should work out which piece of information has been passed by the 
> app? In that case, I didn't implement it that way because determining 
> the type was a bit of a pain and struck me as potentially fragile.

I meant exactly that. The method should work out what information got
passed to it. Of course this might not be easy to implement, but that is
not the point behind this API. The whole API is designed to make it easy
for all kind of applications. And the main focus is not the C language.

We have been through a lot of trouble and parts of hcid look really
horrible, but for the end user (the application) the interface is easy
to use.

I also don't see the problem here. The ASCII service string are a
predefined list of names that actually match to specific UUID. Since in
the end we will implement all needed service names for all known
profiles, we only need to support UUID128. These have a unique form and
are kinda easy to detect. If the provided UUID128 matches the Bluetooth
base string, then we can internally use UUID32 or UUID16. As simple as
that. For the record handles we give them in hex and so they are also
easy to identify. And I would check the string in this order.

And as said, this might require a little bit more code in hcid, but that
is the price to pay if we wanna have a simple API for the application
and I am paying it gladly.

Regards

Marcel




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