I have started working on this integration and would love some help if anyone has experience with protobufs. I took the great work that Adrian has done with the HomeBridge plugin and used that work to port only the lock functionality into HomeAssistant.
Currently, I have the lock and its current status working but activating any commands is still not working. Additionally device details like firmware and model are not working yet.
You can find my project here - GitHub - krozgrov/ha-nest-yale-integration: Custom Home Assistant integration for Nest x Yale door locks, enabling monitoring and control of door locks. Includes features like battery level monitoring, door lock control, and updates via API.
Cheers!