The easiest setup I can think of is Homeassistant, with a Z-Wave and Zigbee gateway attached to it. Then you can buy various z-wave or zigbee devices, and they

The easiest setup I can think of is Homeassistant, with a Z-Wave and Zigbee gateway attached to it. Then you can buy various z-wave or zigbee devices, and they have no vendor lock in and don't rely on wifi or internet access.