In article , Graham.
scribeth thus
Like a lot of other people with CCTV that can be viewed over the
internet, I need to remotely power cycle the modem now and then. Ideas?

Bill

Consider changing you router for a more reliable one.
Consider changing your ISP for a more reliable one.
Power your router from a cheap time-switch that power cycles it at 3am
whether it's needed or not.




Some routers have that built in but if your need is now then use one of
these.

We use them to remote control some equipment they work as;

Ring line - unit answers - enter access code - unit blips "go ahead"
and then use *1# to turn relay One on, and *2# relay Two on etc. and
use #1# 2,3,4 to turn each relay off, all can be set to on or off at
once.

Works very well indeed.

Thats the 4 way one, they do it seems supply single ones now.

https://quasarelectronics.co.uk/Cate...les-telephone-
activated-relay-board-switches
--
Tony Sayer