Add missing WiFi.h #include directive

[per1234]

The "EspMQTTClient" library references objects declared by the WiFi.h header in the "esp32" boards platform's bundled "WiFi" library.

Previously, the "EspMQTTClient" library relied on its #include directive for the WebServer.h header of the "WiFiServer" library providing an #include directive for the WiFi.h header:

https://github.com/espressif/arduino-esp32/blob/2.0.17/libraries/WebServer/src/WebServer.h#L29

This fragile code was broken by changes (espressif/arduino-esp32@f2026f1) made in the version of the "WiFiServer" library bundled with the 3.0.0 release of the "esp32" boards platform:

diff --git a/libraries/WebServer/src/WebServer.h b/libraries/WebServer/src/WebServer.h
index d668c4e70e7..2434855b6eb 100644
--- a/libraries/WebServer/src/WebServer.h
+++ b/libraries/WebServer/src/WebServer.h
@@ -26,8 +26,8 @@
 
 #include <functional>
 #include <memory>
-#include <WiFi.h>
-#include <FS.h>
+#include "FS.h"
+#include "Network.h"
 #include "HTTP_Method.h"
 #include "Uri.h"

causing the library to no longer compile for ESP32-based boards:

c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp: In member function 'bool EspMQTTClient::handleWiFi()': c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:187:5: error: 'WiFi' was not declared in this scope
  187 |     WiFi.disconnect(true);
      |     ^~~~
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:194:27: error: 'WiFi' was not declared in this scope
  194 |   bool isWifiConnected = (WiFi.status() == WL_CONNECTED);
      |                           ^~~~
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:194:44: error: 'WL_CONNECTED' was not declared in this scope; did you mean 'MQTT_CONNECTED'?
  194 |   bool isWifiConnected = (WiFi.status() == WL_CONNECTED);
      |                                            ^~~~~~~~~~~~
      |                                            MQTT_CONNECTED
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:215:27: error: 'WL_CONNECT_FAILED' was not declared in this scope; did you mean 'MQTT_CONNECT_FAILED'?
  215 |       if(WiFi.status() == WL_CONNECT_FAILED || millis() - _lastWifiConnectiomAttemptMillis >= _wifiReconnectionAttemptDelay)
      |                           ^~~~~~~~~~~~~~~~~
      |                           MQTT_CONNECT_FAILED
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp: In member function 'bool EspMQTTClient::handleMQTT()':
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:325:9: error: 'WiFi' was not declared in this scope
  325 |         WiFi.disconnect(true);
      |         ^~~~
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp: In member function 'void EspMQTTClient::onWiFiConnectionEstablished()':
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:362:75: error: 'WiFi' was not declared in this scope
  362 |       Serial.printf("WiFi: Connected (%fs), ip : %s \n", millis()/1000.0, WiFi.localIP().toString().c_str());
      |                                                                           ^~~~
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp: In member function 'void EspMQTTClient::onWiFiConnectionLost()':
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:388:5: error: 'WiFi' was not declared in this scope
  388 |     WiFi.disconnect(true);
      |     ^~~~
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp: In member function 'void EspMQTTClient::connectToWifi()':
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:555:3: error: 'WiFi' was not declared in this scope
  555 |   WiFi.mode(WIFI_STA);
      |   ^~~~
c:\Users\per\Documents\Arduino\libraries\EspMQTTClient\src\EspMQTTClient.cpp:555:13: error: 'WIFI_STA' was not declared in this scope; did you mean 'WIFI_IF_STA'?
  555 |   WiFi.mode(WIFI_STA);
      |             ^~~~~~~~
      |             WIFI_IF_STA

The bug is solved by adding an #include directive for the WiFi.h header the "EspMQTTClient" library depends on.

---

Fixes #142
Fixes #140

Originally reported at https://forum.arduino.cc/t/broken-dependencies/1266624

[roblatour]

Thanks for posting this!

[GiFe71]

This issue, also if fixed by adding the WiFi.h library, couse the impossibility to set static IP Address by adding

WiFi.config(local_IP, gateway, subnet, primaryDNS)

in the setup of the program.

It worked for sure until the 3.0.0 release of the "esp32" boards platform.

Can you check and fix the library to manage static IP Address in some way?

Thanks

[Perromalevo]

any update on this?

[Felix7747]

Fix works on ESP32S2, Thanks