!/bin/bash
#- Pieter Steyn '08

poll_device() {
#Colour Printer

  colour_black=`snmpget 192.168.229.12:161 -v 1 -c public 1.3.6.1.2.1.43.11.1.1.9.1.1 -Ovq` #Black
  colour_cyan=`snmpget 192.168.229.12:161 -v 1 -c public 1.3.6.1.2.1.43.11.1.1.9.1.2 -Ovq` #Cyan
  colour_magenta=`snmpget 192.168.229.12:161 -v 1 -c public 1.3.6.1.2.1.43.11.1.1.9.1.3 -Ovq` #Magenta
  colour_yellow=`snmpget 192.168.229.12:161 -v 1 -c public 1.3.6.1.2.1.43.11.1.1.9.1.4 -Ovq` #Yellow
  colour_tonerdrum=`snmpget 192.168.229.12:161 -v 1 -c public 1.3.6.1.2.1.43.11.1.1.9.1.5 -Ovq` #Toner Drum

}

create() {
#Create the RRD file if they don't already exist.

  if ! [ -e $NAME.rrd ]; then
    rrdtool create $NAME.rrd \
      DS:black:GAUGE:300:0:10000000 \
      DS:cyan:GAUGE:300:0:10000000 \
      DS:magenta:GAUGE:300:0:10000000 \
      DS:yellow:GAUGE:300:0:10000000 \
      DS:toner_drum:GAUGE:300:0:10000000 \
      RRA:LAST:0.5:1:9600 \
      RRA:LAST:0.5:4:9600 \
      RRA:LAST:0.5:24:6000;
  fi

}

update() {
#Update the RRD files.

  poll_device
  echo "$colour_black $colour_cyan $colour_magenta $colour_yellow $colour_tonerdrum"
  rrdtool update $NAME.rrd -t black N:$colour_black
  rrdtool update $NAME.rrd -t cyan N:$colour_cyan
  rrdtool update $NAME.rrd -t magenta N:$colour_magenta
  rrdtool update $NAME.rrd -t yellow N:$colour_yellow
  rrdtool update $NAME.rrd -t toner_drum N:$colour_tonerdrum

}

#    --start=-6400 \
graph() {
#Graph the RRD files.

  rrdtool graph $NAME.png \
    --imgformat=PNG \
    --start="now -1h" \
    --title="HP Color Laserjet 2550" \
    --base=1000 \
    --height=120 \
    --width=500 \
    --alt-autoscale-max \
    --lower-limit=0 \
    --vertical-label="" \
    DEF:blacklast=$NAME.rrd:black:LAST \
    LINE1:blacklast#736F6E:"Current Black Level" \
    GPRINT:blacklast:LAST:"mg remaining\:%6.2lf" \
    DEF:cyanlast=$NAME.rrd:cyan:LAST \
    LINE1:cyanlast#50EBEC:"Current Cyan Level" \
    GPRINT:cyanlast:LAST:"mg remaining\:%6.2lf" \
    GPRINT:cyanlast:LAST:"mg remaining\:%6.2lf" \
    DEF:magentalast=$NAME.rrd:magenta:LAST \
    LINE1:magentalast#E238EC:"Current Magenta Level" \
    GPRINT:magentalast:LAST:"mg remaining\:%6.2lf" \
    DEF:yellowlast=$NAME.rrd:yellow:LAST \
    LINE1:yellowlast#FFFC17:"Current Yellow Level" \
    GPRINT:yellowlast:LAST:"mg remaining\:%6.2lf"

}

update_loop() {
#Update the RRD every 15 mins.

  while true; do
    update
    sleep 5m;
  done

}

NAME="colour_printer"

create
update
update_loop

#DONE

#RESULTS:

892 360 330 188 0 #5mins passed
892 360 330 188 0 #5mins passed
892 360 330 188 0 #5mins passed
892 360 330 188 0 #5mins passed
892 360 330 188 0 #5mins passed

#OK, now I graph:

581x227

But the graph has only NAN's  WHY?