Re: SNMP in EPICS

["Dunning, Michael via Tech-talk" <tech-talk@aps.anl.gov>]

> I want to keep MIB file somewhere in the module, not in the /usr/share/snmp directory.

If you're using the NSCL SNMP support, you can add directories to the
MIB search path by setting the MIBDIRS environment variable in your
IOC startup script, like this:

epicsEnvSet("MIBDIRS", "+$(TOP)/mibs:/some/other/directory")

In this case $(TOP) is the top directory of the IOC application.

This is described here:
https://groups.nscl.msu.edu/controls/files/devSnmp.html#MIBfiles




Michael Dunning
SLAC National Accelerator Laboratory
2575 Sand Hill Road
Menlo Park, CA 94025
(650) 926-5200

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From: Tech-talk <tech-talk-bounces@aps.anl.gov> on behalf of Tomasz Brys via Tech-talk <tech-talk@aps.anl.gov>
Sent: Friday, May 21, 2021 1:13 AM
To: tech-talk@aps.anl.gov <tech-talk@aps.anl.gov>
Subject: SNMP in EPICS

 

Hi,

I have a problem how to implement SNMP protocol in EPICS.

I want to keep MIB file somewhere in the module, not in the /usr/share/snmp directory.

If I run snmpwalk I can:

snmpwalk -v2c -M +/vagrant/modules/e3-M300_GPS/M300_GPS/M300_GPSApp/MBG-SNMP-MIB -m All -c comm 192.168.XXX.XXX MBG-SNMP-LTNG-MIB::mbgLtNgRefclockState

and I get output:

MBG-SNMP-LTNG-MIB::mbgLtNgRefclockState.1 = INTEGER: synchronized(1)

 

How should I define my record in Db?

I did it like that:

record(longin, "$(P)$(R)RefclockState"){

  field(DESC, "Status of GPS refclock")

  field(DTYP, "Snmp")

  field(SCAN, "5 second")

  field(INP,  "@$(HOST) $(COMMUNITY) $(MIB)::mbgLtNgRefclockState Integer: 10")

}

Where:

$(HOST) = 192.168.XXX.XXX – this is of course fake address

$(COMMUNITY) = -c comm

$(MIB) = MBG-SNMP-LTNG-MIB

 

But I got error:

devSnmp: error parsing '192.168.XXX.XXX -c comm MBG-SNMP-LTNG-MIB::mbgLtNgRefclockState Integer: 10'

         format is 'host community oidname mask maxdatalength [set_format/special]'

Error (511,511) PV: P:R:RefclockState devSnmpLi (init_record) bad parameters

 

Any help how I can do this?

 

Best regards

Tomasz Brys

European Spallation Source ERIC