ZigBee is low-power radio (think Bluetooth but simpler), so there’s no Internet involved at all unless you connect it to an Internet-based device, and there you have many choices including open source or home-grown solutions.
ZigBee is low-power radio (think Bluetooth but simpler), so there’s no Internet involved at all unless you connect it to an Internet-based device, and there you have many choices including open source or home-grown solutions.