Apropos of nothing, (though I agree a proper solution is required with ARC) here is how I do it at the moment.
My Synology NAS allows a remote connection to its management interface via a web browser. This is simple to setup, but obviously presupposes you have a NAS!
I create a scheduled task in the NAS UI that just performs a GET connection to the reboot URL for ROCK. The script looks like this;
#!/bin/bash
wget -nd --delete-after http://rock.local/1/reboot
When away from home I login to the NAS UI remotely from my phone and run the scheduled task to restart ROCK.