I just completed a UI prototype using the CAT protocol.
This hardware user interface consists of a Wemos D1 mini lite ESP8266 board and an HN3806-AB-600N rotary encoder. Although not using WiFi, I used an ESP8266 D1 mini lite because it was inexpensive, has a serial interface, and is easy to configure.
Source code and docs available here : https://github.com/Potatof/CATui
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