Hi Eugenio,
in general for AUX I prefer to use RTC GPIO
ESP32 practical power saving: preserve gpio status, external and ULP wake up – 5
For M1 and M2 I exclude special pin like EN GPIO0 or similar for the tedious problem with initial state
But If you can use the pin of the shield, that are tested a lot.
Ebyte LoRa E32 device for Arduino, esp32 or esp8266: WOR (wake on radio) and new ESP32 shield – 8
Bye Renzo
