Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include <WiFiAP.h>
#include <DNSServer.h>

DNSServer dnsServer;
WiFiServer server(80);

#define LED_BUILTIN 2

const char *ssid = "ESP wifi";
// const char webpage[] = R"rawliteral(
const char webpage[] = R"(
HTTP/1.1 200 OK\r\n
Content-type:text/html\r\n \r\n\r\n
<html>
  <meta charset="UTF-8">
  <meta content="width=device-width,initial-scale=1.5" name="viewport">
  <body>
    <h1>ESP32 Simple Server!</h1>
    <h3>LED 2
      <a href="/on"> on</a> / 
      <a href="/off">off</a>
    </h3>
    <h4 id="ledState">Завантаження</h4>
    <form method="GET" action="/submit">
      <label for="message">Enter your message:</label><br>
      <input type="text" id="message" name="message"/><br><br>
      <input type="submit" value="Submit"/>
    </form>
        <script>
        setInterval(() => {
            fetch('/ledState').then(response => response.text()).then(state => {
              document.getElementById('ledState').textContent = state
              }).catch(console.error);
        }, 500);
    </script>
  </body>
</html>
)";


void handler(String currentLine, WiFiClient &client) {
  if (currentLine.indexOf("GET /on") >= 0) {
    digitalWrite(LED_BUILTIN, HIGH);
  }
  else if (currentLine.indexOf("GET /off") >= 0) {
    digitalWrite(LED_BUILTIN, LOW);
  }
  else if (currentLine.indexOf("GET /submit?message=") >= 0) {
    int startIdx = currentLine.indexOf("message=") + 8;
    int endIdx = currentLine.indexOf(" ", startIdx);
    String message = currentLine.substring(startIdx, endIdx);
    message.replace("+", " "); // Заміна "+" на пробіли
    Serial.println("\n\n\n" + message + "\n\n\n");
  }
}


void setup() {
  pinMode(LED_BUILTIN, OUTPUT);

  Serial.begin(115200);
  Serial.println("\nConfiguring access point...");


  if (!WiFi.softAP(ssid)) Serial.println("Soft AP creation failed.");

  IPAddress apIP = WiFi.softAPIP();
  dnsServer.start(53, "*", apIP);

  Serial.print("AP IP address: "); Serial.println(apIP);
  server.begin();
}

void loop() {
  dnsServer.processNextRequest();
  clientChecker();
}


void clientChecker() {
  WiFiClient client = server.available();
  if (client) {
    Serial.println("New Client connected.");
    String currentLine = "";

    while (client.connected()) {
      if (client.available()) {
        char c = client.read();
        Serial.write(c);
        if (c == '\n') {
          if (currentLine.length() == 0) {
            client.print(webpage);
            break;
          } else {
            handler(currentLine, client);
            currentLine = "";
          }
        } else if (c != '\r') {
          currentLine += c;
        }
      }
    }
    client.stop();
    Serial.println("Client disconnected.");
  }
}