Firstly, I think the config file should list wired devices. Secondly, I firstly search Yast where to enable WOL, but found nothing. Then I have found this package in the Package manager and I though WOL will work immediately. I was using WOL before reinstalling OpenSUSE 15.0 to 15.2; unfortunately I don't remember what I had to tweak to let it working. I don't know how to run wol via systemd. I think a Yast option/menu/icon to allow WOL would be the best user-friendly approach. Is it possible to add such a feature?