[mrtg] Real Numbers in Log cause failure

[Jeffrey Wilkinson]

I'm trying to use mrtg 2.10.5 on Win2000 to monitor temperature.  Values from our
router are returned in Celcius but we prefer them in Fahrenheit, so we modified the
Target in mrgt.cfg to *1.8+32.  When we leave as Celcius, integer values are logged
and graphing works fine.  When converted to Fahrenheit, real numbers are the result
and logging/graphing fails, as only a single entry containing real numbers are
logged, no matter how many hours elapse.  I looked at RRDtool but Win32 binaries are
not distributed and we do not have a Visual C++ complier (we are not software
developers).

My question-- is there an easy way to simply have mrtg round or truncate the real
number into an integer to store in the log?  We are not concerned with tenths of a
degree.  I was under the (misguided?) belief that mrtg automatically rounded, but
this appears not to work.

###########################
#  excerpt from mrtg.cfg
###########################

Target[216.136.29.1.temp]:
.1.3.6.1.4.1.9.9.13.1.3.1.3.1&1.3.6.1.4.1.9.9.13.1.3.1.3.2:twtn99 at 10.216.35.1*1.8+32
YLegend[216.136.29.1.temp]: Degrees F
ShortLegend[216.136.29.1.temp]: °F
MaxBytes[216.136.29.1.temp]: 100
Options[216.136.29.1.temp]: gauge,nopercent,growright,integer

###########################
#  Excerpt from log file when using
#  fahrenheit (real numbers).
#  Values are correct, but there is
#  never more than a single line
#  even after hours of running
###########################

1068739710 84.2 91.4
1068739410 0 0 0 0
1068739200 0 0 0 0
1068738900 0 0 0 0
1068738600 0 0 0 0
1068738300 0 0 0 0
1068738000 0 0 0 0
1068737700 0 0 0 0
1068737400 0 0 0 0
1068737100 0 0 0 0
1068736800 0 0 0 0
1068736500 0 0 0 0
1068736200 0 0 0 0
1068735900 0 0 0 0
1068735600 0 0 0 0
1068735300 0 0 0 0
1068735000 0 0 0 0
1068734700 0 0 0 0
1068734400 0 0 0 0

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