Experimental Physics and
Industrial Control System

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

Subject:	Re: timestampField not retrieved using CA provider for pvac::ClientChannel
From:	"Veseli, Sinisa via Tech-talk" <tech-talk at aps.anl.gov>
To:	"Bisegni, Claudio" <bisegni at slac.stanford.edu>, "tech-talk at aps.anl.gov" <tech-talk at aps.anl.gov>
Date:	Fri, 5 May 2023 18:05:15 +0000

Hi,

I am not sure I understand what is going on. Perhaps you could include your code so we can see what exactly you are trying to do?

Also, if you'd like to get all fields, the string 'field()' or just empty string '' should work:

>>> print(c.get('field()'))

epics:nt/NTEnum:1.0

enum_t value

int index 0

string[] choices [Off, On]

alarm_t alarm

int severity 0

int status 0

string message

time_t timeStamp

long secondsPastEpoch 1683129086

int nanoseconds 834120910

int userTag 0

Siniša Veseli

Scientific Software Engineering & Data Management

Advanced Photon Source

Argonne National Laboratory

sveseli at anl.gov

(630)252-9182

From: Bisegni, Claudio <bisegni at slac.stanford.edu>
Sent: Friday, May 5, 2023 12:56 PM
To: Veseli, Sinisa <sveseli at anl.gov>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: timestampField not retrieved using CA provider for pvac::ClientChannel

I tried to set request field as:

pvd::createRequest("field(value, timeStamp, alarm, display, control, valueAlarm)

but I didn’t get the timeStamp Field in PVStructure. The request field work well for all other (for CA provider) for the PVA provider, instead, I always got every field also if I put only “filed(value)” in the request.

I’m wrong somenting….

Claudio

From: Bisegni, Claudio <bisegni at slac.stanford.edu>
Date: Friday, 5 May 2023 at 10:44
To: Veseli, Sinisa <sveseli at anl.gov>, tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: timestampField not retrieved using CA provider for pvac::ClientChannel

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