Publish a Freifunk node to openwifimap.net on your OpenWRT router.
Depends on the olsrd-mod-nameservice and olsrd-mod-txtinfo packages.
Only a node with a single interface and a single neighboring hop is currently supported.
Uses BusyBox' built-in netcat for the request, no curl or wget needed.
$ crontab -e
37 * * * * /usr/bin/openwifimap.sh
Public domain.