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Subject: Re: Problems using devSnmp from NSCL
From: Florian Feldbauer <[email protected]>
To: "John A. Priller" <[email protected]>, EPICS Tech Talk <[email protected]>
Date: Wed, 02 Jul 2014 08:47:32 +0200
Hey,

yes both records show up, when I run the `dbl` command.
Also there is no error message at initialization.

epics> snmpr 2 PANDA:LMD:MUPIX:LV:TEST:ReadSwitchOnOff
============================================================
devSnmp report
============================================================
read task loops : 3034376 (49.8 per sec)
send task loops : 3034301 (49.8 per sec)
active requests : 0

  ========================================
  host wienerpl506
  ========================================
  SNMP version    : SNMP_VERSION_2c
  Max OIDS/req    : 32
  Get Queue items : 0
  Set Queue items : 0
  Active sessions : 0

    ----------------------------------------
    Group 'guru'
    ----------------------------------------
    Host             : wienerpl506
    Send count       : 56804
    Reply count      : 56804
    Error count      : 0
    Avg reply time   : 0.0 msec
    Best reply time  : 0 msec
    Worst reply time : 20 msec
    PV count         : 34
    OID count        : 20

    PVs:

    ----------------------------
    PV 'PANDA:LMD:MUPIX:LV:TEST:ReadSwitchOnOff'
    ----------------------------
    OID name         : WIENER-CRATE-MIB::outputSwitch.u0
    Host/Community   : wienerpl506/guru
    Set type         : 's'
    Special flags    : 0x0000
    Settings count   : 0
    Max data length  : 100
    Raw value string : 'INTEGER: off(0)'
    Reply mask       : 'INTEGER:'
    Value string     : 'off(0)'


    OIDs:


verifying devSnmp tasks are running...
  sendTask is alive
      sendTask_abort  : 0
      sendTask_exited : 0
      globalLastTick  : 2014/07/02 08:37:21
  readTask is alive
      readTask_abort        : 0
      readTask_exited       : 0
      readTask_inSelect     : 0
      readTask_fds          : 18
      readTask_block        : 0
      readTask_ignoreBlocks : 0
      readTask_timeout      : 9 sec 995935 usec

I've just noticed, that the record seems to update correctly but with a READ_ALARM. The record bo/longout combination for setting WIENER-CRATE-MIB::outputSwitch.u0 is working fine...

Concerning the mb/bi/o/direct records: for thinks like the switch on/off stuff it would be nice...(since you don't need the additional longin/out record anymore) originally I also wanted to use mbbiDirect for the outputStatus, but this has 20 bits, so in this case one needs the longin/calc records anyway...

Best regards,
Florian


On 07/02/2014 03:20 AM, John A. Priller wrote:
I might be a little slow helping debug it, I'm away from work until July 10. Do the PV names you're trying to access show up in a 'dbl' command? If so, what shows up when you have the snmp driver do a dump of them? For example:

snmpr 2 PANDA:LMD:MUPIX:LV:TEST:ReadSwitchOnOff

will do a level-2 debug dump of PV/oid info.

The reason we don't support mbbo/i/direct (yet, anyway) is simply because the old snmp driver we based on version on didn't support it and we've never yet needed it. It's something we could add if there's demand for it (and time is available, you know how that goes).

On 07/01/2014 09:00 AM, Florian Feldbauer wrote:
Hey John, hey all,

we have a Wiener PL506 low voltage power supply in our lab controlled via SNMP. I tried using the devSnmp module from NSCL (https://groups.nscl.msu.edu/controls/)
Nearly everything is working just fine, except for two records:

record (longin, "PANDA:$(subsys):$(dev):LV:$(sector):ReadSwitchOnOff") {
  field( DTYP, "Snmp")
  field( INP,  "@$(CRATE) %{WCR}outputSwitch.$(CH) INTEGER: 100")
}
record (longin, "PANDA:$(subsys):$(dev):LV:$(sector):ReadRegulationMode__" ) {
  field( DTYP, "Snmp" )
field( INP, "@$(CRATE) %{WCR}outputRegulationMode.$(CH) INTEGER: 100" )
}

$(CRATE) is the IP-Address of the PL506, %{WCR} = "guru WIENER-CRATE-MIB::"
and $(CH) is "u0".

When I try to process these records, I get the following error:

epics> dbpf PANDA:LMD:MUPIX:LV:TEST:ReadSwitchOnOff.PROC 1
filename="../dbTest.c" line number=375
No such file or directory - dbPutField error

Any idea what's goning wrong here?

Another question to John: Is there a particular reason why e.g. mbbi/o(Direct) or bi/o records are not supported by devSnmp?

Best regards,
Florian



--
----------------------------------------
| Dr. Florian Feldbauer                |
|                                      |
| Helmholtz-Institut Mainz /           |
| Johannes Gutenberg-Universität Mainz |
| Johann-Joachim-Becher-Weg 36         |
| D-55128 Mainz                        |
|                                      |
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----------------------------------------


References:
Re: Problems using devSnmp from NSCL John A. Priller

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