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How to fix PlatformIO ESP8266 ArduinoOTA error: stopAll is not a member of WiFiUDP

Problem:

When compiling your PlatformIO firmware, you see an error message like

arduinoota_build_error.txt
/home/uli/.platformio/packages/framework-arduinoespressif8266/libraries/ArduinoOTA/ArduinoOTA.cpp: In member function 'void ArduinoOTAClass::_runUpdate()':
/home/uli/.platformio/packages/framework-arduinoespressif8266/libraries/ArduinoOTA/ArduinoOTA.cpp:268:12: error: 'stopAll' is not a member of 'WiFiUDP'
    268 |   WiFiUDP::stopAll();
            |            ^~~~~~~

Solution

Remove WiFi from the lib_deps secton of your platform.ini. Before the fix:

platformio.ini.before
lib_deps =
    ESP Async [email protected]
    [email protected]
    WiFi

After the fix:

platformio.ini.after
lib_deps =
    ESP Async [email protected]
    [email protected]

Now check your source code and replace any

wifi_include_fix.cpp
#include <WiFi.h>

by

example.cpp
#include <ESP8266WiFi.h>

in order to prevent the WiFi.h: No Such File or Directory  issue as outlined in How to fix PlatformIO ESP8266 WiFi.h: No Such File or Directory

Now you need to completely remove the .pio folder from your project directory in order to ensure a clean build:

clean_pio.sh
rm -rf .pio

After that, recompile your firmware.

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