Check Usage information on Adam Internet connections

Adam Internet in Australia has a public API which returns an XML page of the current Internet Connection. Information like used download bytes, quota and even ADSL line speed and SNR info.
This Google Go script will query you account info and can be used to monitor various indicators, our favorite and reason to create this, is percentage download usage. See the script for detailed info and usage. The script, check_usage_adam.go should be copied to the Nagios plugins lib folder (in Ubuntu: /usr/lib/nagios/plugins). Compile the script with go build check_usage_adam.go.
The second file I posted is the Nagios config file needed to be able to run the script, see check_usage_adam.cfg. This file lives in the Nagios-plugins config folder, in our system that is /etc/nagios-plugins/config.
The third file, Check_Adam.cfg, is an example of the router configuration file in Nagios. This is where the command in the previous config file is called. Please note that the arguments to the check script are all case-sensitive!

You can also run this script on your Windows PC, provided you have installed the Google Go language, see http://golang.org/. Also your linux machine need this language installed (apt-get install golang).

Just added an example output of Nagios as image.

Update 0.3: Found that the return codes are not transferred the way we ran this script and that we better compile the script (see comment in script). Config file is also changed. Also added "days to go" after the usage_percent.

Have fun with this and feel free to modify it.