Re: Using SNMP...

[David Taylor]

On 30/01/2023 02:03, Gary E. Miller wrote:
> Yo David!
>
> On Sun, 29 Jan 2023 06:38:55 +0000
> David Taylor<davidtaylor@writeme.com>  wrote:
>
> > Perhaps I should have written 3.25.1~dev, that's what cgps tells me.
> >
> >     cgps: 3.25.1~dev (revision release-3.23.1-897-gadcab3c2a)
> That I beleive.
>
> > I did no special configuration of snmpd
> snmpget, snmpwalk, etc talk to snmpd, and snmp talks to gpsd bu way
> of gpssnmp, which you configure in your snmp.conf.  As shown on the
> gpssnmp man page:
>
>         gpssnmp can work as a "pass-through script" with snmpd. To
>         enable this functionality on an already working snmpd
>         installation, add this to your snmpd.conf file, and then restart
>         snmpd:
>
>             # be sure SNMPv2 community "public" can access all MIBs:
>             rocommunity public  localhost
>
>             # configure pass-thur of GPSD-MIB to gpssnmp
>             pass .1.3.6.1.4.1.59054  /usr/local/bin/gpssnmp
>
>
>
> > What
> > should I have done?
> What the man page (above) says to do.
>
> > Here are the results from the tests you suggested:
> >
> > pi@RasPi-23:~ $ snmpgetnext -v 2c localhost -c public
> > .1.3.6.1.4.1.59054.3.2.1.1 iso.3.6.1.6.3.1.1.6.1.0 = INTEGER:
> > 1952941162
> That only works if you did the gpssnmp configuration above.
>   
> > pi@RasPi-23:~ $ snmpwalk  -v 2c localhost -c public gpsd
> > gpsd: Unknown Object Identifier (Sub-id not found: (top) -> gpsd)
> > pi@RasPi-23:~ $ snmpwalk  -On -v 2c localhost -c public gpsd
> > gpsd: Unknown Object Identifier (Sub-id not found: (top) -> gpsd)
> You also forgot to install the GPSD-MIB.  Where it goes is system
> dependent.  On Gentoo it goes here:
>         /usr/share/snmp/mibs/GPSD-MIB
>
> RGDS
> GARY

Many thanks, Gary.

This is the first time I have dealt with MIB files directly, so I was unaware 
of the need to edit /etc/snmp/snmp.conf.  On the Raspberry Pi this required 
removing an "mib :" entry, and adding a pointer to the GPS file:

  mibfile /usr/local/share/snmp/mibs/gpsd/GPSD-MIB

On the RPi OS most MIB files are elsewhere.

I was unaware of the need to add the pass command:

  pass .1.3.6.1.4.1.59054  /usr/local/bin/gpssnmp

Having done that, I was delighted to get the set of data:

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GPSD-MIB::skyNumber = INTEGER: 1
GPSD-MIB::skyIndex.1 = INTEGER: 1
GPSD-MIB::skyPath.1 = STRING: /dev/ttyAMA0
GPSD-MIB::skynSat.1 = INTEGER: 28
GPSD-MIB::skyuSat.1 = INTEGER: 14
GPSD-MIB::skySNRavg.1 = INTEGER: 1600
GPSD-MIB::skyGdop.1 = INTEGER: 160
GPSD-MIB::skyHdop.1 = INTEGER: 75
GPSD-MIB::skyPdop.1 = INTEGER: 142
GPSD-MIB::skyTdop.1 = INTEGER: 73
GPSD-MIB::skyVdop.1 = INTEGER: 121
GPSD-MIB::skyXdop.1 = INTEGER: 51
GPSD-MIB::skyYdop.1 = INTEGER: 54
GPSD-MIB::tpvLeapSeconds = INTEGER: 18
GPSD-MIB::tpvNumber = INTEGER: 1
GPSD-MIB::tpvIndex.1 = INTEGER: 1
GPSD-MIB::tpvPath.1 = STRING: /dev/ttyAMA0
GPSD-MIB::tpvMode.1 = INTEGER: 3
GPSD-MIB::tpvStatus.1 = INTEGER: 0
GPSD-MIB::tpvLatitude.1 = INTEGER: 559xxxxxx
GPSD-MIB::tpvLongitude.1 = INTEGER: -32xxxxxx
GPSD-MIB::tpvAltHAE.1 = INTEGER: 2354010
GPSD-MIB::tpvAltMSL.1 = INTEGER: 1855800
GPSD-MIB::tpvClimb.1 = INTEGER: -730
GPSD-MIB::tpvTrack.1 = INTEGER: 3530210
GPSD-MIB::tpvSpeed.1 = INTEGER: 360
GPSD-MIB::tpvEpc.1 = INTEGER: 1010000
GPSD-MIB::tpvEph.1 = INTEGER: 375000
GPSD-MIB::tpvEps.1 = INTEGER: 1588000
GPSD-MIB::tpvEpt.1 = INTEGER: 50000
GPSD-MIB::tpvEpv.1 = INTEGER: 512500
GPSD-MIB::tpvEpx.1 = INTEGER: 706800
GPSD-MIB::tpvEpy.1 = INTEGER: 815199
GPSD-MIB::tpvTime.1 = STRING: 2023-01-30T10:26:22.000Z
GPSD-MIB::verRelease = STRING: 3.25.1~dev
GPSD-MIB::verRevision = STRING: release-3.23.1-897-gadcab3c2a
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

I'll be testing those out in due course.

Thanks again,
David
--
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