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Sounds like you need Morgan & Morgan
So what are the talking points or take aways from the video?
Depends what part of it you are considering. The mobile apps are “free” but not OSS.
So, it’s kinda mixed. The firmware is open source, while the mobile apps are freemium based.
This probably only applies to the V3. The V4 uses the ESP32-S3’s USB peripheral instead of a CP2102.

reverse engineering a proprietary UART protocol

This sounds cool and all but then

Turns out it was just standard 8N1 115200-baud UART.

I didn’t see any mention of this proprietary UART protocol in your blog and the GitHub project looks like it was as simple as reflashing the onboard ESP32 once everything is wired correctly?

Did they even resolve the issues with the Rust implementation of coreutils?

Isn’t that an off the shelf part?

seeedstudio.com/XIAO-7-5-ePaper-Panel-p-6416.html

XIAO 7.5" ePaper Panel

  Powered by XIAO ESP32-C3, this 7.5 inch ePaper display is a energy-efficient smart home e-ink screen designed to seamlessly integrate with Home Assistant. Ideal for showcasing dashboard real-time data, weather updates, and schedules, this compact device offers crisp visuals, 3-months battery life (2000mAh) in deep sleep mode, and easy customization via Arduino. Perfect for modern living spaces, it combines functionality with elegant design for a smarter home experience.

I guess you never heard of cPLA 😉
Pretty solid how to by James TDG 😉 Louis shouldn’t be given the credit here