Wokwi - Online ESP32, STM32, Arduino Simulator

#include <WiFi.h>
#include <WiFiClient.h>
#include <WebServer.h>
#include <ESPmDNS.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <QRCode.h>

const char* ssid = "nom_du_reseau_wifi";
const char* password = "mot_de_passe_wifi";

WiFiServer server(80);

void setup() {
  WiFi.begin(ssid, password);
  
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
  }
  
  server.begin();
}

void generateQRCode(String text) {
  QRCode qrcode;
  uint8_t qrcodeData[qrcode_getBufferSize(3)];
  qrcode_initText(&qrcode, qrcodeData, 3, ECC_MEDIUM, text.c_str());
  
  Adafruit_SSD1306 display(128, 64, &Wire, -1);
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);
  display.clearDisplay();
  
  for (int8_t y = 0; y < qrcode.size; y++) {
    for (int8_t x = 0; x < qrcode.size; x++) {
      if (qrcode_getModule(&qrcode, x, y)) {
        display.drawPixel(x, y, WHITE);
      } else {
        display.drawPixel(x, y, BLACK);
      }
    }
  }
  
  display.display();
}

void handleRoot() {
  String text = "Hello World!";
  generateQRCode(text);
  
  server.send(200, "text/html", "<html><body><img src=\"qr.png\"></body></html>");
}

void loop() {
  WiFiClient client = server.available();
  
  if (client) {
    while (client.connected()) {
      if (client.available()) {
        client.read();
      }
    }
    
    handleRoot();
  }
}