Re: IOC showing out errors in call SNMP functions on linux-x86_64

["Hu, Yong via Tech-talk" <tech-talk at aps.anl.gov>]

Hi John, glad to hear that the SNMP support module will be on GitHub. Thanks!

One more suggestion to Varuna: it is a common practice (probably an EPICS build rule) to put the variable EPICS_BASE=/usr/local/epics/base at the end of RELEASE(.local)

Cheers,

Yong

From: Priller, John <priller at frib.msu.edu>
Date: Thursday, February 26, 2026 at 6:30 AM

I actually just now got around to updating our website with 1.1.0.5 (which just adds a new adjustable parameter for SessionStaleSec).   And I've got a patch suggested by Miroslaw Dach for better SNMP text separator parsing, which I still need to test and roll out, so hopefully there'll be a 1.1.0.6 soon(ish).

I'd like to get the code into epics-modules, a request to do so has gone up the management chain.  Yes it's all Public License, but it's still a hoop that must be jumped through.

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Hu, Yong via Tech-talk <tech-talk at aps.anl.gov>
Sent: Wednesday, February 25, 2026 7:11 PM
To: tech-talk at aps.anl.gov
Subject: FW: IOC showing out errors in call SNMP functions on linux-x86_64

 

As Henrique mentioned in another thread, there are multiple versions of EPICS support for SNMP. I am using John Priller’s version 1.1.0.4. 

Where did you get your source codes? In your /usr/local/epics/Support/snmp/…, you may look through the source file snmpRegister.cpp where the IOC shell commands devSnmpXxx are defined.   

Cheers,

Yong

From: Varuna Crishan Meddage <vmeddage at fnal.gov>
Date: Wednesday, February 25, 2026 at 5:51 PM

Yes, I see the following output.

iocdev1$ ldd WRSwitch | grep -i "Snmp"

libdevSnmp.so => /usr/local/epics/Support/snmp/lib/linux-x86_64/libdevSnmp.so (0x00007f15660cf000)

libnetsnmp.so.40 => /lib64/libnetsnmp.so.40 (0x00007f1565e72000)

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From: Hu, Yong <yhu at bnl.gov>
Sent: Wednesday, February 25, 2026 4:23 PM
To: Priller, John <priller at frib.msu.edu>; Varuna Crishan Meddage <vmeddage at fnal.gov>; tech-talk at aps.anl.gov <tech-talk at aps.anl.gov>
Subject: Re: IOC showing out errors in call SNMP functions on linux-x86_64

 

Hi Varuna,

Additional to John’s suggestion of verifying your ‘WRSwitch.dbd’, you can do a few more checks:

1. Your SNMP support module is located at /usr/local/epics/Support/snmp. You are using WRSwitch_LIBS += devSnmp and WRSwitch_DBD += devSnmp.dbd. Do you see the SNMP support library files generated? i.e. /usr/local/epics/Support/snmp/lib/linux-x86_64/libdevSnmp.so (.a)? 
2. 
   
3. Check your IOC’s binary by the command ldd (or the command strings) and you should see something related to SNMP: ldd /export/home1/vmeddage/WRSwitch/bin/linux-x86_64/WRSwitch | grep -i snmp

HTH,

Yong

From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Priller, John via Tech-talk <tech-talk at aps.anl.gov>
Date: Tuesday, February 24, 2026 at 1:01 PM

What is the content of your file here:

/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch/dbd/WRSwitch.dbd

When I 'grep -i snmp' on one of mine, it gives:

device(longin, INST_IO, devSnmpLi, "Snmp")

device(ai, INST_IO, devSnmpAi, "Snmp")

device(ao, INST_IO, devSnmpAo, "Snmp")

device(longout, INST_IO, devSnmpLo, "Snmp")

device(waveform, INST_IO, devSnmpWf, "Snmp")

device(stringin, INST_IO, devSnmpSi, "Snmp")

device(stringout, INST_IO, devSnmpSo, "Snmp")

registrar(snmp_Register)

The final registrar line is what provides the devSnmpXxx commands to IOC shell.

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From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of Varuna Crishan Meddage via Tech-talk <tech-talk at aps.anl.gov>
Sent: Tuesday, February 24, 2026 12:47 PM
To: tech-talk at aps.anl.gov
Subject: IOC showing out errors in call SNMP functions on linux-x86_64

 

My EPICS IOC call SNMP specific functions (devSnmpSetSnmpVersion, devSnmpSetParam).

When I run my IOC these function calls throw out errors saying (Command devSnmpSetSnmpVersion not found.)

In my Makefile at App/src area, I am calling the support snmp library and dbd file correctly.

Any help to solve this issue ?

(Here I am pasting output of after running st.cmd,  Makefile at App/src are,  content of Release.local file,  content of st.cmd file at iocBoot area)

******************************************* START OF OUTPUT AFTER RUNNING ST.CMD FILE ***************************************************

iocdev1$ ./startWRSwitch.bash 

/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch

#!../../bin/linux-x86_64/WRSwitch

< envPaths

epicsEnvSet("IOC","iocWRSwitch")

epicsEnvSet("TOP","/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch")

epicsEnvSet("MODULES","/export/home1/vmeddage/WRSwitch/iocTops")

epicsEnvSet("EPICS_BASE","/usr/local/epics/base")

epicsEnvSet("SUPPORT","/usr/local/epics/Support")

epicsEnvSet("SNCSEQ","/usr/local/epics/Support/seq")

epicsEnvSet("ASYN","/usr/local/epics/Support/asyn")

epicsEnvSet("IPAC","/usr/local/epics/Support/ipac")

epicsEnvSet("CALC","/usr/local/epics/Support/calc")

epicsEnvSet("STD","/usr/local/epics/Support/std")

epicsEnvSet("SSCAN","/usr/local/epics/Support/sscan")

epicsEnvSet("STREAM","/usr/local/epics/Support/StreamDevice")

epicsEnvSet("BUSY","/usr/local/epics/Support/busy")

epicsEnvSet("IOCSTATS","/usr/local/epics/Support/iocStats")

epicsEnvSet("LINSTAT","/usr/local/epics/Support/linStat")

epicsEnvSet("LUA","/usr/local/epics/Support/lua")

epicsEnvSet("PCRE","/usr/local/epics/Support/pcre")

epicsEnvSet("SNMP","/usr/local/epics/Support/snmp")

epicsEnvSet("ACNETPV","/usr/local/epics/Support/acnetPV")

epicsEnvSet("ALIVE","/usr/local/epics/Support/alive")

epicsEnvSet("TCAST","/usr/local/epics/Support/tcast")

epicsEnvSet("RECASTER","/usr/local/epics/Support/RecCaster")

epicsEnvSet("AUTOSAVE","/usr/local/epics/Support/autosave")

epicsEnvSet("PUTLOG","/usr/local/epics/Support/caPutLog")

## NTP Time Synchronisation

#epicsEnvSet("EPICS_TS_NTP_INET","131.225.121.105")

## Do OS-specific startup here

epicsEnvSet("EPICS_HOST_ARCH","linux-x86_64")

epicsEnvSet("ENGINEER","vmeddage")

epicsEnvSet("LOCATION","BTE-223")

epicsEnvSet("EPICS_IOC_OWNER","vmeddage")

epicsEnvSet("EPICS_IOC_GROUP","FE_group")

epicsEnvSet("EPICS_IOC_LOCATION","BTE-223")

epicsEnvSet("IOCDIR","WRSwitch")

epicsEnvSet("MIBDIRS","+/export/home1/vmeddage/.snmp/mibs")

cd "/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch"

## Register all support components

# Load SNMP support database

dbLoadDatabase("/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch/dbd/WRSwitch.dbd",0,0)

WRSwitch_registerRecordDeviceDriver(pdbbase)

INFO: PVXS QSRV2 is loaded, permitted, and ENABLED.

2026-02-24T11:42:03.147799408 WARN pvxs.tcp.setup Server unable to bind port 5075, falling back to [::]:35161

dbRegisterServer: Ignoring 'rsrv', per environment

## SNMP specifics

devSnmpSetSnmpVersion(10.200.34.10,SNMP_VERSION_2C)

ERROR st.cmd line 29: Command devSnmpSetSnmpVersion not found.

devSnmpSetParam("DebugLevel",2)

ERROR st.cmd line 31: Command devSnmpSetParam not found.

devSnmpSetParam("SessionTimeout", "1000000")

ERROR st.cmd line 32: Command devSnmpSetParam not found.

## Protocal file

#epicsEnvSet("STREAM_PROTOCOL_PATH","/usr/local/epics/Support/cmsIon/cmsIonApp/protocol")

## Load record instances

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchalive.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchwatcher.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchiocAdminSoft.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchAcnetDevice.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchExtra.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchtcast.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchRecCaster.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/test.db")

dbLoadTemplate("/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch/db/wrz16_pip2_switch.substitution")

## Put logging and access security

epicsEnvSet("EPICS_CA_JSON_PUT_LOG_ADDR","/home/epics/epicsDEV/PutLog/test.json")

asSetFilename("/export/home1/vmeddage/WRSwitch/iocTops/WRSwitch/iocBoot/iocWRSwitch/ioc.acf")

iocInit()

Starting iocInit

############################################################################

## EPICS R7.0.9

## Rev. R7.0.9-dirty

## Rev. Date Git: 2025-02-21 17:31:33 -0600

############################################################################

iocRun: All initialization complete

caPutJsonLogInit localhost:7011

## Create as many matching Acnet devices as needed and uncomment

#createAcnetDeviceRecord Z:WRSwitchCRTL

dbpf PIP2:Time_CRTL_SYS:alive.EV1 linux-x86_64

PV 'PIP2:Time_CRTL_SYS:alive.EV1' not found

dbpf PIP2:Time_CRTL_SYS:alive.EV2 7.0.9

PV 'PIP2:Time_CRTL_SYS:alive.EV2' not found

dbpf PIP2:Time_CRTL_SYS:alive.EV3 /usr/local/epics/base

PV 'PIP2:Time_CRTL_SYS:alive.EV3' not found

dbpf PIP2:Time_CRTL_SYS:alive.EV4 /usr/local/epics/Support

PV 'PIP2:Time_CRTL_SYS:alive.EV4' not found

dbpf PIP2:Time_CRTL_SYS:alive.EV5 vmeddage

PV 'PIP2:Time_CRTL_SYS:alive.EV5' not found

log client: failed to connect to server '127.0.0.1:7011' because 'Connection refused'

dbpf PIP2:Time_CRTL_SYS:alive.EV6 BTE-223

PV 'PIP2:Time_CRTL_SYS:alive.EV6' not found

dbpf PIP2:Time_CRTL_SYS:alive.EV7 "Front Ends"

PV 'PIP2:Time_CRTL_SYS:alive.EV7' not found

****************************************** END OF OUTPUT AFTER RUNNING ST.CMD FILE ************************************************

********************************************** START OF MAKE FILE ***********************************************************************

TOP=../..

include $(TOP)/configure/CONFIG

#----------------------------------------

#  ADD MACRO DEFINITIONS AFTER THIS LINE

#=============================

#=============================

#=============================

# Build an IOC support library

#LIBRARY_IOC += devSnmpLocal

#devSnmpLocal_SRCS += $(SNMP)/snmpApp/src/snmpRegister.cpp

#devSnmpLocal_SRCS += $(SNMP)/snmpApp/src/snmpSessShow.c

#devSnmpLocal_SRCS += $(SNMP)/snmpApp/src/devSnmp.cpp

#devSnmpLocal_LIBS += $(EPICS_BASE_IOC_LIBS)

#=============================

# Build the IOC application

PROD_IOC = WRSwitch

# WRSwitch.dbd will be created and installed

DBD += WRSwitch.dbd

# WRSwitch.dbd will be made up from these files:

WRSwitch_DBD += base.dbd

# modified menuScan.dbd to include FNAL scan rates

WRSwitch_DBD += menuScan.dbd

# Include dbd files from all support applications:

WRSwitch_DBD += pvxsIoc.dbd

WRSwitch_DBD += iocAdmin.dbd

WRSwitch_DBD += aliveRecord.dbd

WRSwitch_DBD += sseqRecord.dbd

WRSwitch_DBD += sscanSupport.dbd

WRSwitch_DBD += acnetPV.dbd

WRSwitch_DBD += tcast.dbd

WRSwitch_DBD += reccaster.dbd

WRSwitch_DBD += asSupport.dbd

WRSwitch_DBD += caPutJsonLog.dbd

WRSwitch_DBD += devSnmp.dbd

# Add all the support libraries needed by this IOC

WRSwitch_LIBS += devIocStats

WRSwitch_LIBS += alive

WRSwitch_LIBS += acnetPV

WRSwitch_LIBS += calc

WRSwitch_LIBS += pv seq

WRSwitch_LIBS += sscan

WRSwitch_LIBS += tcast

WRSwitch_LIBS += reccaster

WRSwitch_LIBS += autosave

WRSwitch_LIBS += caPutLog

WRSwitch_LIBS += pvxsIoc pvxs

WRSwitch_LIBS += devSnmp

# WRSwitch_registerRecordDeviceDriver.cpp derives from WRSwitch.dbd

WRSwitch_SRCS += WRSwitch_registerRecordDeviceDriver.cpp

WRSwitch_SRCS += CopyArray.c

# Build the main IOC entry point on workstation OSs.

WRSwitch_SRCS_DEFAULT += WRSwitchMain.cpp

WRSwitch_SRCS_vxWorks += -nil-

# Add header files:

#USR_INCLUDES += -I/usr/include

#

# Finally link to the EPICS Base libraries

WRSwitch_LIBS += $(EPICS_BASE_PVA_CORE_LIBS) # Added by Varuna

WRSwitch_LIBS += nt pvaClient pvDatabase # Added by Varuna

WRSwitch_LIBS += $(EPICS_BASE_IOC_LIBS)

#USR_CFLAGS += `net-snmp-config --cflags`   # W.T.   

#USR_CPPFLAGS += `net-snmp-config --cflags` # W.T.

#USR_CFLAGS += -DNETSNMP_NO_INLINE

#USR_LDFLAGS += `net-snmp-config --libs` # W.T.

#PROD_LDLIBS += `net-snmp-config --libs` # W.T.

#USR_CFLAGS += -fPIE

#USR_CPPFLAGS += -fPIE

USR_CFLAGS += `net-snmp-config --cflags`

USR_CFLAGS += -fPIE

USR_LDFLAGS += `net-snmp-config --libs`

PROD_LDLIBS += `net-snmp-config --libs`

#USR_CFLAGS += $(shell $(PERL) $(SNMP)/snmpApp/src/getNetSNMPversion.pl) # Added by Varuna

#USR_CPPFLAGS += $(shell $(PERL) $(SNMP)/snmpApp/src/getNetSNMPversion.pl) # Added by Varuna

USR_CXXFLAGS_DEFAULT += -fno-operator-names -pedantic

USR_CXXFLAGS += -W -Wall

USR_CXXFLAGS += -fPIE

#===========================

include $(TOP)/configure/RULES

#----------------------------------------

#  ADD RULES AFTER THIS LINE

#USR_CXXFLAGS_DEFAULT += -fno-operator-names -pedantic

#USR_CXXFLAGS += -W -Wall

*********************************************************************** END OF MAKE FILE *********************************************

In my RELEASE.local file I am specifying the correct location of snmp directory as well.

*********************** START of RELEASE.LOCAL FILE *********************************************

EPICS_BASE=/usr/local/epics/base

SUPPORT=/usr/local/epics/Support

SNCSEQ=$(SUPPORT)/seq

ASYN=$(SUPPORT)/asyn

IPAC=$(SUPPORT)/ipac

CALC=$(SUPPORT)/calc

STD=$(SUPPORT)/std

SSCAN=$(SUPPORT)/sscan

STREAM=$(SUPPORT)/StreamDevice

BUSY=$(SUPPORT)/busy

IOCSTATS=$(SUPPORT)/iocStats

LINSTAT=$(SUPPORT)/linStat

LUA=$(SUPPORT)/lua

PCRE=$(SUPPORT)/pcre

SNMP=$(SUPPORT)/snmp

ACNETPV=$(SUPPORT)/acnetPV

ALIVE=$(SUPPORT)/alive

TCAST=$(SUPPORT)/tcast

RECASTER=$(SUPPORT)/RecCaster

AUTOSAVE=$(SUPPORT)/autosave

PUTLOG=$(SUPPORT)/caPutLog

******************************************* END OF RELEASE.LOCAL FILE ****************************

**********************************. START OF ST.CMD FILE **********************************************

#!../../bin/linux-x86_64/WRSwitch

#- You may have to change WRSwitch to something else

#- everywhere it appears in this file

< envPaths

## NTP Time Synchronisation

#epicsEnvSet("EPICS_TS_NTP_INET","131.225.121.105")

## Do OS-specific startup here

epicsEnvSet("EPICS_HOST_ARCH","linux-x86_64")

epicsEnvSet("ENGINEER","$(ENGINEER=vmeddage)")

epicsEnvSet("LOCATION","$(LOCATION=BTE-223)")

epicsEnvSet("EPICS_IOC_OWNER","vmeddage")

epicsEnvSet("EPICS_IOC_GROUP","FE_group")

epicsEnvSet("EPICS_IOC_LOCATION","BTE-223")

epicsEnvSet("IOCDIR","WRSwitch")

epicsEnvSet("MIBDIRS","+/export/home1/vmeddage/.snmp/mibs")

cd "${TOP}"

## Register all support components

# Load SNMP support database

dbLoadDatabase("${EPICS_IOCTOPS}/${IOCDIR}/dbd/WRSwitch.dbd",0,0)

WRSwitch_registerRecordDeviceDriver(pdbbase)

## SNMP specifics

devSnmpSetSnmpVersion(10.200.34.10,SNMP_VERSION_2C)

devSnmpSetParam("DebugLevel",2)

devSnmpSetParam("SessionTimeout", "1000000")

## Protocal file

#epicsEnvSet("STREAM_PROTOCOL_PATH","/usr/local/epics/Support/cmsIon/cmsIonApp/protocol")

## Load record instances

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchalive.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchwatcher.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchiocAdminSoft.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchAcnetDevice.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchExtra.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchtcast.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/WRSwitchRecCaster.db")

#dbLoadRecords("${EPICS_IOCTOPS}/${IOCDIR}/db/test.db")

dbLoadTemplate("${EPICS_IOCTOPS}/${IOCDIR}/db/wrz16_pip2_switch.substitution")

## Put logging and access security

epicsEnvSet("EPICS_CA_JSON_PUT_LOG_ADDR","/home/epics/epicsDEV/PutLog/test.json")

asSetFilename("${EPICS_IOCTOPS}/${IOCDIR}/iocBoot/ioc${IOCDIR}/ioc.acf")

iocInit()

caPutJsonLogInit localhost:7011

## Create as many matching Acnet devices as needed and uncomment

#createAcnetDeviceRecord Z:WRSwitchCRTL

dbpf PIP2:Time_CRTL_SYS:alive.EV1 ${ARCH}

dbpf PIP2:Time_CRTL_SYS:alive.EV2 ${EPICS_VERSION_SHORT}

dbpf PIP2:Time_CRTL_SYS:alive.EV3 ${EPICS_BASE}

dbpf PIP2:Time_CRTL_SYS:alive.EV4 ${EPICS_SUPPORT}

dbpf PIP2:Time_CRTL_SYS:alive.EV5 vmeddage

dbpf PIP2:Time_CRTL_SYS:alive.EV6 BTE-223

dbpf PIP2:Time_CRTL_SYS:alive.EV7 "Front Ends"

*************************************************** END OF ST.CMD FILE *********************************************