On Mon, 28 Jan 2019 18:22:51 +0000
Andy Burns wrote:

Rob Morley wrote:

get a small computer (Raspberry Pi Zero) to ping
somewhere reliable like google.com, and if it fails for a few
minutes at a time it can operate a relay to interrupt power to the
modem.

And that will generally only need to be a 12V relay, not mains.

That's a good point I hadn't considered, but worthwhile if the user is
concerned about remotely (and blindly) switching mains voltage.