[ros-users] ros-users Digest, Vol 48, Issue 9

Ingo Lütkebohle iluetkeb at gmail.com
Tue Feb 18 08:42:17 UTC 2014

On Tue, Feb 18, 2014 at 2:12 AM, Brian Gerkey <gerkey at osrfoundation.org>wrote:

> On Mon, Feb 17, 2014 at 9:06 AM, Wrede, Sebastian
> <swrede at techfak.uni-bielefeld.de> wrote:
> >  * How will services / RPC be implemented with DDS? Is there already an
> > accepted standard protocol for doing RPC over DDS?
> My understanding is: (i) the current DDS spec doesn't include what we
> call services; (ii) there's an extension for services that is
> currently under consideration and may make its way into a future
> revision of the spec; and (iii) some current implementations have
> vendor-specific extensions for services.

I know that many people feel otherwise, but in my personal opinion,
services are a bad idea anyway, and what we really want is something more
like (though not necessarily exactly the same) what actionlib offers. That
is, something which *explicitly* acknowledges that there are always
packets/messages underneath, that there is asynchronicity, and that there
may be impossibility to act *in the protocol*.

Just saying ;-)


Ingo Lütkebohle, Dr.-Ing.
Machine Learning and Robotics Lab, IPVS, Universität Stuttgart

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