Arduino core for the ESP32 sets -Werror=all for warning levels of "More" or "All" in the Arduino IDE's File > Preferences > Compiler warnings setting. This upgrades what would have previously been a warning about the lack of a return statement in non-void WlanReadWpa() to a compilation error. Since the call to WlanReadWpa() doesn't expect a return value and there is nothing obvious in the function to return, I have changed the return type to void to fix this error/warning.
Note there is another one of these errors caused by the "ESP8266 and ESP32 Oled Driver for SSD1306 display" library but that issue has already been resolved upstream and so the solution there is to simply update the library to 4.0.0.
I recommend you to set File > Preferences > Compiler warnings: > All.
Arduino core for the ESP32 sets
-Werror=allfor warning levels of "More" or "All" in the Arduino IDE's File > Preferences > Compiler warnings setting. This upgrades what would have previously been a warning about the lack of a return statement in non-voidWlanReadWpa()to a compilation error. Since the call toWlanReadWpa()doesn't expect a return value and there is nothing obvious in the function to return, I have changed the return type to void to fix this error/warning.Note there is another one of these errors caused by the "ESP8266 and ESP32 Oled Driver for SSD1306 display" library but that issue has already been resolved upstream and so the solution there is to simply update the library to 4.0.0.
I recommend you to set File > Preferences > Compiler warnings: > All.