You can use luci-app-vlmcsd to control it. luci-app-vlmscd support KMS auto-activation.

Travis CI:

If you don't use luci-app-vlmcsd and you want vlmcsd support KMS auto activation, you should modify the settings of dnsmasq manually:

1. Add the following line at the end of /etc/dnsmasq.conf:

  srv-host=_vlmcs._tcp.lan,hostname.lan,1688,0,100

  (replace "hostname.lan" with your actual host name, eg: openwrt.lan, or just replace it with your IP of LAN）

2. Restart dnsmasq:

   /etc/init.d/dnsmasq restart

   You can check if the dnsmasq setting works with the following cammand in Windows:

   nslookup -type=srv _vlmcs._tcp.lan

   The response should be your router's IP.

3. /etc/init.d/vlmcsd enable && /etc/init.d/vlmcsd start && /etc/init.d/dnsmasq restart

Your can find pre-compiled ipk: https://github.com/cokebar/openwrt-vlmcsd/tree/gh-pages