Experimental Physics and
Industrial Control System

Jure Varlec via Tech-talk <tech-talk at aps.anl.gov> · Tue, 3 Oct 2023 09:57:08 +0200

On 10/3/23 06:07, STARRITT, Andrew wrote:

Caution: This email originated from outside of Cosylab.

Hi all,

What was the final solution here?

I tried on one of our Control Room OPI hosts.
With the client side firewall off, everything worked as expected.
With client side firewall on, I had no access, even with using pvxs.

Hi Andrew,

As Michael summarized, the PVXS *server* responds in a different (and more conformant way) than the old server based on pvAcessCPP. Meaning, using PVXS on the client won't help. The solution is rebuilding your IOC with QSRV2 [1], which is based on PVXS [2], while noting that this stuff is still experimental and that defaults could change [3]. For us, the issue arises in a staging environment for a project where we can't use QSRV2, so we weren't able to test this, but given the nature of the problem, I'm pretty sure it should work with the usual one-way firewalls. If you can give QSRV2 a test drive, it would be great, and many of us would be grateful; this stuff should get more testing.

[1] https://mdavidsaver.github.io/pvxs/ioc.html#qsrv-2
[2] https://mdavidsaver.github.io/pvxs/building.html#includepvxs
[3] https://github.com/mdavidsaver/pvxs/pull/58

Best,
Jure

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System