haha, well if you run it on the slug its even easier 🙂
ipkg install cron
although im not even sure thats neccesary.
then edit your crontab with your fave editor, or just use
(crontab normalyl sits in /etc/crontab or so) which will invoke vi and will probably leave you puzzled *g* 😀
so a new line in crontab like this
5 0 * * * /opt/bin/wget http://user:[email protected]:port/config-update.html?action=rescan
should do the trick, if you want to run the rescan every day at 05:00 (am)