This project is amazing! I know there's some prior art, but I feel like I've never seen anything wifi-related moving so... smoothly? (With that high of an update/sample rate, I guess?) as your visualizations do.

I do have one question that wasn't quite clear to me, in case you happen to see this. There's a bunch of mentions of Channel State Information, but Google doesn't give a ton of info on it. So I'm just wondering, is CSI a "client-side" thing provided by the ESP32 for any Wi-Fi connection, or is it some special protocol feature that the AP or client have to enable?