delay() keeps WiFi running

If you have a loop somewhere in your sketch that takes a lot of time (>50ms)
without calling delay, you might consider adding a call to delay function to
keep the WiFi stack running smoothly.

Source: https://web.archive.org/web/20240620105303/https://arduino-esp8266.readthedocs.io/en/3.0.0/reference.html#timing-and-delays

src/main.cpp

@@ -55,5 +55,5 @@ void ensureWiFiConnection() {
 void loop() {
   ensureWiFiConnection();
   testInternet();
-  delay(5000); // TODO: cleaner interval between tests
+  delay(5000);
 }