I have pretty much the same functionality, including the printing, plus I have a home IoT setup. Through the MQTT app on my phone I can view and control the ho

I have pretty much the same functionality, including the printing, plus I have a home IoT setup. Through the MQTT app on my phone I can view and control the home heating, see the output from various sensors (like house temp and outside temp) and control some of the lights - all without having to send my data to a commercial product's cloud service to manage things. The IoT hub is an Atom-based Mini ITX machine running Ubuntu server, Mosquitto (MQTT message broker), Node-Red (MQTT message handler) and Home Assistant to manage some of the sensors and automation (although Node-Red does most of the work). I'll probably move the whole lot to a Raspberry Pi at some time. This setup is more of a base to exercise my electronics hobby skills than a serious attempt to automate everything - for example, the home heating IoT stuff overlays (rather than replaces) the traditional electronic timer and temperature sensors on the heating/hot water system, so if the IoT cleverness goes offline, watchdog relays will return control to the old timer/sensors. VPN access is through a Draytek xDSL Router (2860) - they have good inbuilt VPN support.