[Nut-upsdev] Updating snmp-mib.c with new Cyberpower v2.0 MIB

[Jim Klimov]

On November 2, 2017 5:31:42 AM GMT+01:00, Ben Kamen <ben at benkamen.net> wrote:
>On 10/31/2017 01:13 AM, Jim Klimov wrote:
>> If the new data is in a separate OID tree, it can quite be a new MIB.
>Otherwise you can use the UNIQUE flag and set the preferred (e.g.
>newer, more precise) source for a value first in the list of same-named
>mappings in existing file - if there's a hit on an actual device, it
>will be used and not iterated onwards. The flag is not yet supported
>for all cases though (e.g. daisy-chained devices), so some other
>combinations would set the preferred value mapping last in list.
>> I'm on the road now so can't point exactly, but there's a text file
>in docs/ (?)  which lists and describes the mappings which drivers
>should share (for any media and vendor-protocol -- e.g. networked snmp
>in this case).
>
>the gen-snmp script -- VERY handy... looks like I just have to fish
>through the MIB (which seems pretty well documented) to add the beef...
>
>
>As for the UNIQUE flag, since this is SNMP, I'm guessing we'll have the
>network plug-ins that are the old MIB (I'll have to look it up) versus
>the new network modules that support the v2.0 MIB.
>
>for now, I'm building a separate .C and .H file.
>
>More later..
>
> -Ben
>
>
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I believe the main reason for a new set of .c/.h files here would be if the new MIB is defined in a separate subtree. The top-level mapping binds the vendor entry OIDs (often "hidden" so one has to know where to poke). It may also be higher in the list of snmp-ups.h, in case the device also serves the older MIB but you'd prefer the newer (e.g. common standard IETF one is always last).

If both the older and newer data are in the same vendor tree, e.g. new leaf points are added, you'd extend the existing table.

Jim
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