feat(common.opcua): Add session timeout as configuration option

[maxime-jolliet-airseas]

Summary

Adding the parameter "session_timeout" to OPCUA plugins configuration.

Checklist

• No AI generated code was used in this PR

Related issues

resolves #15258

[telegraf-tiger]

Thanks so much for the pull request!
🤝 ✒️ Just a reminder that the CLA has not yet been signed, and we'll need it before merging. Please sign the CLA when you get a chance, then post a comment here saying !signed-cla

[maxime-jolliet-airseas]

!signed-cla

[srebhan]

Thanks @maxime-jolliet-airseas for your contribution! I do have some comments in the code. It would also be nice to see a unit-test for the new option if possible...

[maxime-jolliet-airseas]

Hi srebhan, thank you for taking care of this PR.
I took into account your remarks, except for the unit test.
I know nothing about Go, and I didn't found anything testing config parameters that I could use as template. Could you point me to some tests if they do exist ?

[srebhan]

@maxime-jolliet-airseas thanks for the quick update!

Please do not change existing tests (see comments in the code) as we are using those to check backward compatibility of changes... I also do have a suggestion to only convert the timeout if set.

Regarding tests, the only way I see is to set the session timeout to a very low value (e.g. 100 millisecond), establish a session and then check if it actually timed out... But not a must...

[maxime-jolliet-airseas]

Ok, I removed the tests modifications.
As for adding a test; I did what you suggested, and created a Client with a very low session timeout. The client is still able to read data from the server; even when adding a time.Sleep. I suspect it reconnects automatically.
I did manually check on my server that the client connected with the configured session timeout, as my server exposes in OPCUA the list of connected clients along with their config. But the server used in the integration tests does not exposes connected clients, so I can't check like that in a test.

[srebhan]

Awesome! Thanks @maxime-jolliet-airseas!

[powersj]

Thanks for the PR! I am going to remove the "default is..." statement as the value in the config is the default.

[telegraf-tiger]

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amd64.deb	aarch64.rpm	darwin_amd64.tar.gz	windows_amd64.zip
arm64.deb	armel.rpm	darwin_arm64.tar.gz	windows_arm64.zip
armel.deb	armv6hl.rpm	freebsd_amd64.tar.gz	windows_i386.zip
armhf.deb	i386.rpm	freebsd_armv7.tar.gz
i386.deb	ppc64le.rpm	freebsd_i386.tar.gz
mips.deb	riscv64.rpm	linux_amd64.tar.gz
mipsel.deb	s390x.rpm	linux_arm64.tar.gz
ppc64el.deb	x86_64.rpm	linux_armel.tar.gz
riscv64.deb		linux_armhf.tar.gz
s390x.deb		linux_i386.tar.gz
		linux_mips.tar.gz
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		linux_ppc64le.tar.gz
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