Choose a base name

Transports are tiny scripts sending a measured quantity from standard input. They are specific to MRTG Online protocols.

Add cron jobs

Paste the following to your crontab:

read VALUE ; wget -q --post-data="value=$VALUE" \ -O /dev/null -S "http://mrtg.prcn.co.cc/u/$1"

Wait for 5 minutes

Empty graphs will be created

Wait for 5 more minutes

First data will show

Enjoy

Note that this setup is "quick and dirty": anyone can in principle see your graphs and even add data points on your behalf. You should upgrade to a more secure setup later.