Yes, I am very interested in ucode. I have not played with it much yet, I am still in the docs and browsing src stage in regards to that.
Here is an example on one of my projects from last fall,
openwrt-ubus-with-esp-now-and-kasa-smart-home-devices-iot-network
I did indeed need LL device access for this project. Also, the library I wrote for interacting with Kasa Smart Home Devices, KasaC has a ubus module and lua-ubus bindings (kasalua). It was needed ... or preferred rather, in this project.
I am currently working on a ubus mod for the Mongoose C Networking library.I'm working on the websockets module right now. It will all be configured thru luci webui eventually so the bindings are a must.