Experimental Physics and
Industrial Control System

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<== Date ==>		<== Thread ==>

Subject:	Re: timestampField not retrieved using CA provider for pvac::ClientChannel
From:	"Bisegni, Claudio via Tech-talk" <tech-talk at aps.anl.gov>
To:	"Veseli, Sinisa" <sveseli at anl.gov>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Fri, 5 May 2023 17:44:54 +0000

Hi,

Thank you for yor help, is effect on get operation I use the default request, so Iat this point I need to use pvd::createRequest("field(value, timeStamp, alarm, display, control, valueAlarm)")); to retrieve all field

I’ll give a try!

Thank you very much.

Claudio

From: Veseli, Sinisa <sveseli at anl.gov>
Date: Friday, 5 May 2023 at 09:55
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>, Bisegni, Claudio <bisegni at slac.stanford.edu>
Subject: Re: timestampField not retrieved using CA provider for pvac::ClientChannel

Hi,

I am not sure exactly why is there a difference in behavior between caget and pvget, but you should be able to get timestamps if you request them explicitly:

$ caget -a S01-DAQTBT:Strm:DataCaptureC

S01-DAQTBT:Strm:DataCaptureC 2023-05-03 10:51:26.834121 Off

PV request string like field(value,timeStamp) should work from C++:

>>> from pvapy import *

>>> c = Channel('S01-DAQTBT:Strm:DataCaptureC', CA)

>>> print(c.get('field(value,timeStamp)'))

epics:nt/NTEnum:1.0

enum_t value

int index 0

string[] choices [Off, On]

time_t timeStamp

long secondsPastEpoch 1683129086

int nanoseconds 834120910

int userTag 0

Hope this helps,

Sinisa

Siniša Veseli

Scientific Software Engineering & Data Management

Advanced Photon Source

Argonne National Laboratory

sveseli at anl.gov

(630)252-9182

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Bisegni, Claudio via Tech-talk <tech-talk at aps.anl.gov>
Sent: Friday, May 5, 2023 11:39 AM
To: tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: timestampField not retrieved using CA provider for pvac::ClientChannel

Hello EPICS tech,

I'm working with last epics release and I have notice that making a get operation for an IOC using a CA provider for crete a pvac::ClientChannel I don't receive the timestamp field:

I noticed that also the official caget has the problem:

developer@e058f4bc2090:/workspace$ pvget variable:sum

variable:sum 2023-05-05 16:34:54.607 3

developer@e058f4bc2090:/workspace$ caget variable:sum

variable:sum 3

so is a client library problem or a server or something else?

Thank

you in advance.

Claudio