XIOA B2B connector

The Schematic which you can find on the Official Github Page has all the Pinouts listed:

The Connector is the DF40C-30DP-0.4V(51).

You can also check out it´s Datasheet here:
https://www.mouser.at/datasheet/2/185/DF40_Catalog_D31649_en-2301840.pdf

I hope this helps,

Maurice