Today the RN131G WiFi module had its firmware successfully upgraded to version 4.41 and I could connect to it via Telnet.
This module is already mounted in his horseshoe PCB breakout and connected to the communications MCU module via the backbone PCB.
This means that now I can connect to the MCU module via WiFi!
My next step is to start to assemble the sensor submodule. Soon I'll publish the sensor readings via WiFi here.
Thank you for your support!