Once upon a time when Zigbee was the latest hype, a friend worked on a project to cast cheap hygrometer sensors into concrete and have them report via a mesh ne

Once upon a time when Zigbee was the latest hype, a friend worked on a project to cast cheap hygrometer sensors into concrete and have them report via a mesh network. Apparently sensors were predicted to be cheaper than to have an engineer walk the site taking readings to ensure it’s ok to start covering it up.