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opc_ua Browsepath can't use namespace 2 [message #1847714]

Thu, 04 November 2021 07:29

Eclipse User

When I use the opc_ua protocol, an error is reported when the created FB is deployed. It shows that "could not translate browse paths". could you give me some suggestions? the picture is followed.
Such like this "opc_ua[CALL_METHOD;opc.tcp://localhost:48400/freeopcua/server#;/Objects/2:MyObject/2:multiply]"

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Re: opc_ua Browsepath can't use namespace 2 [message #1847718 is a reply to message #1847714]

Thu, 04 November 2021 09:14

Eclipse User

Have you tried removing the second 2:?

Re: opc_ua Browsepath can't use namespace 2 [message #1847724 is a reply to message #1847718]

Thu, 04 November 2021 09:51

Eclipse User

Yes, I've tried, but the result is still the same. The Node full path is 0:Root,0:Objects,2:MyObject,2:multiply.

Re: opc_ua Browsepath can't use namespace 2 [message #1847731 is a reply to message #1847724]

Thu, 04 November 2021 11:16

Eclipse User

I'm not very good with opc ua but did you create MyObject first?

Re: opc_ua Browsepath can't use namespace 2 [message #1847732 is a reply to message #1847731]

Thu, 04 November 2021 11:28

Eclipse User

yeah, I created. i use other client to communicate with opc ua, is well

Re: opc_ua Browsepath can't use namespace 2 [message #1847889 is a reply to message #1847732]

Thu, 11 November 2021 07:57

Eclipse User

I don't see anything wrong with your applicaition. Try using another FORTE as your OPC UA server offering the same method at the same path and see if it works. It might be that the opcua library in forte has some issues with freeopcua

Re: opc_ua Browsepath can't use namespace 2 [message #1848010 is a reply to message #1847714]

Wed, 17 November 2021 07:02

Eclipse User

hi, i did a quick exercise with the freeopcua server. for me, it seems that something is wrong with their TranslateBrowsePathToNodeIds method that we use for method calls. I think that your other client (if this is UaExpert, then I am sure) doesn't use translate..() when calling an opc ua method from a server -- and then it works. With 4diac, you can read a variable from a server using either BrowsePath (using TranslateBrowsePathToNodeIds just as in method calls) or NodeId of the variable. with a freeopcua server, reading a variable works in 4diac when you do it via a nodeId and fails with the same problem as you have for methods when trying to read it via the BrowsePath. So the next step would be to look what does the server returns in its translate...() method, but this is already on the freeopcua side :-)

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Re: opc_ua Browsepath can't use namespace 2 [message #1848109 is a reply to message #1848010]

Sat, 20 November 2021 11:56

Eclipse User

just today i remembered that we have already had a discussion about the issue some time ago [1]. there, i even figured out how to hotfix this in the freeopcua stack. probably, the hack still works :-)

[1] https://bugs.eclipse.org/bugs/show_bug.cgi?id=571883

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