On Tue, Feb 18, 2014 at 2:12 AM, Brian Gerkey <gerkey@osrfoundation.org> wrote:
On Mon, Feb 17, 2014 at 9:06 AM, Wrede, Sebastian
<swrede@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 ;-)

cheers

--
Ingo Lütkebohle, Dr.-Ing.
Machine Learning and Robotics Lab, IPVS, Universität Stuttgart
http://www.ipvs.uni-stuttgart.de/abteilungen/mlr/abteilung/mitarbeiter/Ingo.Luetkebohle
+49-711-685-88350

PGP Fingerprint 3187 4DEC 47E6 1B1E 6F4F  57D4 CD90 C164 34AD CE5B