It's not clear from the MOD-WIFI-ESP8266 webpage what SDIO mode does exactly.
Basically I want to communicate with the MOD-WIFI-ESP8266 module using RX/TX (via UEXT) where I want the MOD-WIFI-ESP8266 module to give me the readings from GPIO4 and GPIO5 as I see these pins are made available (assume I can attach something here) or I want to send an instruction to MOD-WIFI-ESP8266 via RX/TX to change the logic level of these two pins.
So trying to work out what mode do I put the module in to do this.