Re: caget: Identical process variable names on multiple servers

["J. Lewis Muir via Tech-talk" <tech-talk@aps.anl.gov>]

On 11/11, Smith, Martin wrote:
> I think that this is happening because your PV name starts with a capital letter. At APS PVs that start with a
> capital letter are usually accelerator PVs so the PV gateway for your beamline lets that through. Although
> This should not be getting back through the reverse PV gateway but seems that it is. So the PV appears to be
> a duplicate I would guess because the PV gateway probably shows it has one and your IOC says that it has
> one.

Hi, Marty!

The PV name starting with a capital letter was Tejas's example, not
mine.  In my case, the actual PV names start with a number, not a
capital letter.

Still, this is a PV naming restriction for beamlines at the APS
that I did not know about.  Is it an official restriction, or are
you just wondering if it might be related to that due to a possible
misconfiguration in the APS-managed CA gateway that's on each sector's
"public" network?

Basically, I don't think there is a PV named the same as mine on the
APS accelerator side of things, so then I don't understand how the
APS-managed CA gateway could claim to have that PV.

> The thing I think that you would want to note is which CA server did it actually connect to and which got ignored.

Yes, and unfortunately, all I have is what it says in the
CA.Client.Exception messages, which is 0.0.0.1:5 and 0.0.0.2:5.  Is
there some other way for me to tell which CA server it ultimately
connected to?

But on top of that, and I just included this in my reply to Tejas, but I
failed to include the following error message that appeared right after
the CA.Client.Exception messages, which might indicate that it didn't
connect to any CA server in this case:

----
Channel connect timed out: some PV(s) not found.
----

> At APS beamline PVs should start with either with a lower case letter or a number which will help prevent this
> sort of thing from happening.

OK, the actual PV names in this case started with a number, so I'm
thinking that means that's not the problem.

> If you want to have a private conversation about this I would be happy to look into this issue for you.

OK, thanks.

> As far as if you are getting strange IP addresses I'm not sure what that is about.

Yeah, me neither.

Thanks!

Lewis