Re: epics snmp

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

(I missed the tech-talk post Jörn replied to, weird...)

I think the issue is that your INP field isn't right.

field(INP,"@$(HOST) public $(MIB)::pduInputPhaseSTATUSVoltage.1.1 Float 100")

The text field after the OID (here, that's $(MIB)::pduInputPhaseSTATUSVoltage.1.1) is a string the driver should look for in the device's reply string, to help locate where the value text is.  You're using "Float" for this, when your device appears to be returning "INTEGER:".  Try this:

field(INP,"@$(HOST) public $(MIB)::pduInputPhaseSTATUSVoltage.1.1 INTEGER: 100")

Or, you could instruct the driver to use native data types instead of strings, using the 'n' flag.  For example:

field(INP,"@$(HOST) public $(MIB)::pduInputPhaseSTATUSVoltage.1.1 INTEGER: 100 in")

Where the "in" flags field has an "i" for integer format and a "n" to specify native format.  In this case the driver ignores the "INTEGER:" text locator field (but you still have to specify something there).

- JP

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From: Jörn Dreyer <j.dreyer at hzdr.de>
Sent: Thursday, March 14, 2024 5:28 AM
To: Priller, John; tech-talk at aps.anl.gov
Cc: tech-talk at aps.anl.gov; White
Subject: Re: epics snmp

 

[EXTERNAL] This email originated from outside of FRIB

Hi White,



do you have access to the IOC shell?

If so, try the following:



dbpr TEST:Voltage



(This will print out the actual value (VAL field) as stored in the IOC database. Should be 0 as in the caget command)



dbtr TEST:Voltage



(This will trigger the processing of the record and print the result (VAL field))



Check the STAT field of both outputs. This will tell you if an error occurred during processing of the record.



Regards

Jörn



Am Donnerstag, 14. März 2024, 09:48:06 CET schrieb White via Tech-talk:

> Thank you for your  help，I changed the port to 5064. Now I have a new problem.

> The value I get with the snmpget command is 219:

>

>

> snmpget -v1 -c public 192.168.0.1 ENLOGIC-PDU-MIB::pduInputPhaseSTATUSEntry.6.1.1

>

> ENLOGIC-PDU-MIB::pduInputPhaseSTATUSVoltage.1.1 = INTEGER: 219

>

> 

>

> The value obtained with caget is 0, which does not match the actual value:

>

> caget  TEST:Voltage

>

> TEST:Voltage      0

>

> 

>

> The db file is as follows:

>

> 

>

> record(ai,"$(DEV):Voltage")

>

> {

>

>     field(DESC,"SNMP channel")

>

>     field(DTYP,"Snmp")

>

>     field(SCAN,".2 second")

>

>     field(PREC,"3")

>

>     field(INP,"@$(HOST) public $(MIB)::pduInputPhaseSTATUSVoltage.1.1 Float 100")

>

> }

>

> 

>

> The mib file is as follows:

>

> pduInputPhaseSTATUSVoltage OBJECT-TYPE

>

>   -- FROM       ENLOGIC-PDU-MIB

>

>   SYNTAX        Integer32

>

>   MAX-ACCESS    read-only

>

>   STATUS        current

>

>   DESCRIPTION   "Returns the voltage, in Volts(V)"

>

> ::= { pduInputPhaseSTATUSEntry 6 }

>

>

>

> Is there an error somewhere in the db file?

>

>

> Thanks,

> White

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

>

> At 2024-03-13 18:30:54, "Priller, John via Tech-talk" <tech-talk at aps.anl.gov> wrote:

>

>

>

>

> It doesn't appear to be related to SNMP (that's my driver, if you need help with it), it looks like the issue is you're changing the EPICS_CA_SERVER_PORT in your st.cmd. 

>

>

>

>

> By default, caget is going to use port 5064.  Do you also set an environment variable for this in the console you're running caget in?

>

>

>

> To make doubly sure that your IOC does in fact have a TEST:Current record, what are the results of a "dbl" command in your IOC's shell?  You can add the dbl command to the end of your st.cmd to check the output from that, if you're not running the IOC with an active shell under procServ or similar.

>

>

> From: Tech-talk <tech-talk-bounces at aps.anl.gov> on behalf of White via Tech-talk <tech-talk at aps.anl.gov>

> Sent: Wednesday, March 13, 2024 4:44 AM

> To: tech-talk at aps.anl.gov

> Subject: epics snmp

> 

> [EXTERNAL] This email originated from outside of FRIB

>

>

> Hi，

> I'm trying to control the device using the SNMP protocol and the db file is as follows:

>

> 

>

> record(ai,"$(DEV):Current")

>

> {

>

>     field(DESC,"SNMP channel")

>

>     field(DTYP,"Snmp")

>

>     field(SCAN,".2 second")

>

>     field(PREC,"3")

>

>     field(INP,"@$(HOST) public $(MIB)::pduInputPhaseSTATUSCurrent.1.1 Float 100")

>

> }

>

> 

>

> The st.cmd file are as follows:

>

> < envPaths

>

> 

>

> epicsEnvSet("EPICS_CA_SERVER_PORT", 6310)

>

> epicsEnvSet("EPICS_PVA_SERVER_PORT", 6710)

>

> epicsEnvSet("MIBDIRS", "+$(TOP)/mibs:/usr/local/share/snmp/mibs")

>

> epicsEnvSet("IOCNAME","npdu")

>

> cd "${TOP}"

>

> ## Register all support components

>

> dbLoadDatabase "dbd/npdu.dbd"

>

> npdu_registerRecordDeviceDriver pdbbase

>

> devSnmpSetSnmpVersion(192.168.0.1:161,SNMP_VERSION_1)

>

> devSnmpSetMaxOidsPerReq(192.168.0.1:161,50)

>

> dbLoadRecords "db/dbpdux.db", "DEV=TEST, HOST=192.168.0.1, MIB=ENLOGIC-PDU-MIB"

>

> cd "${TOP}/iocBoot/${IOC}"

>

> iocInit

>

> But there is an error:

>

>  caget TEST:Current

>

> Channel connect timed out: 'TEST:Current' not found.

>

> If there is no error in the DB, the device is not connected, is there an error in the st.cmd file?

> Thanks,

> White

>