https://github.com/ntd/opcua-primer

Sample OPC-UA server based on a model design XML
https://github.com/ntd/opcua-primer

linux modeldesign opc opc-ua opcua open62541 server ua-modelcompiler

Last synced: 2 months ago
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Sample OPC-UA server based on a model design XML

• Host: GitHub
• URL: https://github.com/ntd/opcua-primer
• Owner: ntd
• License: mit
• Created: 2022-12-20T08:59:39.000Z (about 2 years ago)
• Default Branch: master
• Last Pushed: 2022-12-20T10:35:03.000Z (about 2 years ago)
• Last Synced: 2024-05-17T00:19:16.338Z (8 months ago)
• Topics: linux, modeldesign, opc, opc-ua, opcua, open62541, server, ua-modelcompiler
• Language: Makefile
• Homepage:
• Size: 190 KB
• Stars: 5
• Watchers: 2
• Forks: 1
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
It seems the sanest way (from a human perspective) of modelling an OPC-UA

server is to create a (relatively) simple XML file describing data and

relations (the ["model design"](http://opcfoundation.org/UA/ModelDesign.xsd)

format), convert it into another more machine-oriented XML file (the

["NodeSet2"](http://opcfoundation.org/UA/2011/03/UANodeSet.xsd) format) and

then generate from it the C code to be linked against other server code.

The conversion from model design to NodeSet2 is performed by

[UA-ModelCompiler](https://github.com/OPCFoundation/UA-ModelCompiler), a tool

officially endorsed by the OPC foundation, while the generation of the C code

from NodeSet2 is performed by `nodeset_compiler.py`, a Python script provided

by the awesome [Open62541](https://github.com/open62541/open62541) project.

While `nodeset_compiler.py`, apart from being included in PATH, does not

require any particular processing, the `UA-ModelCompiler` is strongly geared

towards Windows/DotNet and it is in general quite unpleasant to work with.

In other words, compiling model designs on GNU/Linux systems is a nightmare.

The only documentation I found is the

[OPC-UA information model tutorial](https://opcua.rocks/from-modelling-to-execution-opc-ua-information-model-tutorial/),

which provides a strong foundation for understanding the whole process but the

commands reported there for converting the model design simply do not work on

my system (ArchLinux current).

After a lot of trials and errors, I came up with a solution based on `docker`

that does not require building and installing `UA-ModelCompiler` natively.

See the `Makefile` for the gory details.

The sample model design used here is an adaptation of the work done by

_Industry40tv_ on its [YouTube tutorial](https://youtu.be/gxA7SDNLHgc): check

it out for a really good introduction.