Firmware for an expansion module based on MGM210L Silabs module: https://github.com/Adminiuga/MGM210-Expansion
This is being developed with VSCode and I have not tried building it using Simplicity Studio. This relies on https://github.com/Adminiuga/Raz1_custom_components_extension custom extensions installed with your Gecko SDK.