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Aleksandar Kovacevic · Apr 3, 2019

Hey Eduard,

The code I sent you, which communicates with OPC UA Server is example for binary protocol (opc.tcp://Server). However, as a new version of old OPC, focus was to make old OPC more available to new trends. Therefore, by standard, each OPC UA server should be able to communicate also as a web service (http://Server). However, I could not find much of the OPC UA servers that offer Web Service capability. Maybe some commercial implementations.

OPC UA is organized similarly to Service Oriented Architecture (SOA) Standard,
with a secure channel.

OPC UA Java Library that I use in my PoC implementation has whole stack implemented. It connects to the OPC UA Server, downloads certificates required for communication, and creates the secure channel to communicate with the server.
There are two main messages: Browse Request und Read Service Request.
The data on OPC UA server are organized in form of a tree, where every node has different types; metadata, attribute, variable, etc. Read Service Request is very sensitive about node types.

I used https://github.com/OPCFoundation/UA-Java-Legacy repository as a basis to build Java Business Host, but this repo is not maintained, so if there are some newer versions of the standard, this repository might not be up to date anymore.

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Jose-Tomas Salvador Apr 5, 2019 to Aleksandar Kovacevic

We have several partners working on industrial sector that have mentioned that having support for OPC UA in IRIS would be great as it's becoming a de-facto stantard in their sector... I didn't dig much into technical details so far, but, based on your knowledge, would it be worthy to have it natively supported in IRIS or is using Java Business Hosts+external Java Library the better approach in this case?

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Aleksandar Kovacevic Apr 10, 2019 to Jose-Tomas Salvador

Hello Jose,

Taking into account only the amount of complexity of OPC UA standard, I could imagine it might need a bit more time to have it implemented natively. I am not much experienced in COS to be able to estimate that, but I would say quicker solution is still JBH+external library.
I will work further on this (hopefully temporal) JBH solution.

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