Well since you were already validating your MAC on the router, see if this is an option for you still working in my case (not that I leave the house much anymore).
So like most I’ve experienced the network binding loosing track of mobile devices on my network; and while arping does resolve a lot of these issues, I originally created my openhab server in a different subnet/VLAN. For those who are not network savy arping does not work well in this scenario as it will resolve to the VLAN gateway IP and never change the mobile device to OFF.
So while the tasker guide I wrote up works well, I occasionally had hiccups (mainly from the wife’s phone); so I decid…