ESP32/simple_web/explanation.md

An explanation for the code in this dir

AsyncWebServer server(80);

Start the Web Server on port 80

WiFi.begin(ssid, password);
  if (WiFi.waitForConnectResult() != WL_CONNECTED) {
    Serial.printf("WiFi Failed!\n");
    return;
}

Start the WIFI with WiFi.begin(ssid, password); and wait for connection.

server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
        request->send(200, "text/html", "<a href=\"/on\">Turn the LED ON</a><a href=\"/off\">Turn the LED OFF</a>");
    });

server.on Defines an endpoint for a request (e.g /index.html)

request->send([..]"<button onclick=\"fetch('http://192.168.178.198/on')\">Turn LED ON</button>[..]"); on Request answer with 200 in the format text/html with this string

server.on("/on", HTTP_GET, [](AsyncWebServerRequest *request){
        request->send(200, "text/plain", "Was there ever anything here?");
        digitalWrite(LED_BUILTIN, HIGH);
    });

This is for when the user clicks on the ON button and fetches the /on url it turns the LED on!