Re: A web power switch ?
You can buy a web power switch off Amazon for about $10. They call them "smart plugs". All cheap IoT crap.
And to operate them from afar you need a working DSL as well as the appropriate hole(s) in your firewall. Those not working correctly could be a reason to want to use the switch while actually making it impossible to do so.
An Arduino checking outbound connectivity from inside your home LAN and toggling power to the modem is a) not relying on the connectivity it's trying to restore and b) autonomous.
Improving this setup so that the Arduino (code or hardware) failing is dealt with is left as an exercise for the reader.
Biting the hand that feeds IT
