S-16 - Wokwi ESP32, STM32, Arduino Simulator

`#include <WiFi.h>
#include <WebServer.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";

WebServer server(80);

String htmlPage() {
  return R"rawliteral(
    <!DOCTYPE html>
    <html>
    <head>
      <title>ESP32 OTA Demo</title>
    </head>
    <body style="text-align:center;font-family:Arial;">
      <h2>ESP32 OTA Academic Demo</h2>
      <button onclick="location.href='/update'" 
              style="padding:15px;font-size:18px;">
              Check for Firmware Update
      </button>
    </body>
    </html>
  )rawliteral";
}

void simulateOTA() {
  Serial.println("Checking for firmware update...");
  delay(1000);

  Serial.println("Firmware found!");
  delay(1000);

  Serial.println("Downloading firmware...");
  delay(1500);

  Serial.println("Writing to flash...");
  delay(1500);

  Serial.println("Verifying firmware...");
  delay(1000);

  Serial.println("Update Successful!");
  Serial.println("Restarting ESP32...");
  delay(2000);

  ESP.restart();
}

void handleRoot() {
  server.send(200, "text/html", htmlPage());
}

void handleUpdate() {
  server.send(200, "text/html", "<h3>Updating Firmware... Check Serial Monitor</h3>");
  simulateOTA();
}

void setup() {
  Serial.begin(115200);
  Serial.println("Connecting to WiFi...");

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("\nConnected!");
  Serial.print("IP Address: ");
  Serial.println(WiFi.localIP());

  server.on("/", handleRoot);
  server.on("/update", handleUpdate);
  server.begin();

  Serial.println("Web server started");
}

void loop() {
  server.handleClient();
}