You can build a wifi smart plug with an ESP8266 for 2 euro from aliexpress. A GSM module costs 2 euro. A serial console over SSH with an old raspberry 1. And

You can build a wifi smart plug with an ESP8266 for 2 euro from aliexpress. A GSM module costs 2 euro. A serial console over SSH with an old raspberry 1. And the whole ensemble would take much less space.