On 2016-11-30 11:41, Wolfgang Mauerer wrote:

Am 29/11/2016 um 20:36 schrieb Jan Kiszka:

does anyone already have some experience with OSS OPC UA
implementations, specifically for resource constrained devices? We
stumbled over

http://open62541.org

which seems like being on the right path. There are more

https://github.com/open62541/open62541/wiki/List-of-Open-Source-OPC-UA-Implementations

but not all look that attractive for embedded devices, due to language,
license or main drivers.

there's another tiny implementation from some of the Ostwestfalen-Lippe
(OWL) group of people in Germany, but since it targets devices with
only 10s of KiB of RAM and ROM, I don't think it's suitable for our
purposes.

If you have a link (and the project has a proper license), maybe send a
PR to the open62541.org to extend their list.

As for language and main drivers: Do we have an agreement or an idea
in the group what suitable languages are, and what characteristics main
drivers should have? Considering the size of systems we're targeting, I
personally would not see C (and possibly C++) as the only admissible
language.

If we only had higher languages, that would be a major limitation. It's
not so much about their size, more about their amount of dependencies
and their suitability for embedded processors (just having "fun" with Go
on Intel Quark...).

But also having bindings for Java, C#, python, JavaScript, Go,
you-name-them, would be valuable. So I would recommend to start with a
common core - thus a native one - and add those bindings to them. Later
on, if there is added value, we could also consider alternative core
implementations.

Regards,
Jan

Best regards, Wolfgang

I think, eventually, CIP should look into the topic free and
standard-conforming OPC UA as well because it is gaining a lot of
traction as THE protocol for data exchange in automation industry.

Regards,
Jan
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