Happen to be working on writing a new MIB which does this right now.

The textual-convention is:

FixedDiv10 ::=3D TEXTUAL-CONVENTION

     DISPLAY-HINT "d-1"

     STATUS current

     DESCRIPTION "Fixed Integer value with one decimal digit"

     SYNTAX Integer32


Then you use it just like:


gnssAltitude OBJECT-TYPE

     SYNTAX FixedDiv10

     MAX-ACCESS read-only

     STATUS current

     DESCRIPTION "The altitude being reported by the gnss receiver"

     ::=3D { gnssReceiverEntry 5 }


I'm planning on adding a note to the description indicating that the raw
value needs to be divided by 10 if this isn't done automatically by the
customer's SNMP tools.


Note that the phrase "FixedDiv10" could be anything you want.   I am still
considering whether or not this is the right phrase, since FixedDiv10 isn't
exactly right.  FixedExp-1 isn't very clear to non-math types, etc.


I've seen implementations where they set a TEXTUAL-CONVENTION for each type
of data, i.e. TenthsOfVolts, which might make more sense.


-forrest

On Mon, Jul 2, 2018 at 6:49 PM, Harold Hallikainen <
harold@mai.hallikainen.org> wrote:

> From
> https://stackoverflow.com/questions/2142265/what-is-a-
> good-way-to-show-a-floating-point-number-via-snmp
> , it appears you can send fixed point non-integer values as INT32 with a
> scaling factor to position the decimal point. I THINK the conversion from
> the INT32 (say, divide by 1,000) to the fixed point non-integer is
> specified in the MIB using TEXTUAL-CONVENTION and DISPLAY-HINT. Does
> anyone have a sample MIB that does this?
>
> Thanks!
>
> Harold
>
>
> --
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