unsigned long lastDebounceTime = 0;  // the last time the output pin was toggled

unsigned long debounceDelay = 50;    // the debounce time; increase if the output flickers

const size_t bufferSize = JSON_OBJECT_SIZE(4) + 70;

void connect() {

  Serial.print("\nChecking WiFi...");

  while (WiFi.waitForConnectResult() != WL_CONNECTED) {

    Serial.println("Connection Failed! Reboot...");

    ESP.restart();

  }

  Serial.println("Connected to WiFi!");

  Serial.print("Connected to: ");

  Serial.println(WiFi.SSID());

  Serial.print("IP: ");

  Serial.println(WiFi.localIP());

  Serial.print("Connecting to MQTT Server...");

  while (!client.connect(MQTT_CLIENT_ID, MQTT_USERNAME, MQTT_PASSWORD)) {

    Serial.print(".");

    delay(1000);

  }

  Serial.println("\nConnected to MQTT!");

  client.publish(MQTT_AVAILABILITY_TOPIC, "online", true, 2);

  client.subscribe(MQTT_STATE_TOPIC);

}

void on_state_received(String &topic, String &payload) {

  StaticJsonDocument<bufferSize> jb;

  auto error = deserializeJson(jb, payload);

void setup() {

  Serial.begin(115200);

  Serial.println("Booting...");

  pinMode(LED_BUILTIN, OUTPUT);

  WiFi.hostname(HOSTNAME);

  WiFi.mode(WIFI_STA);

  WiFi.begin(WIFI_SSID, WIFI_PASS);

  client.begin(MQTT_SERVER, WiFiclient);

  httpServer.on("/", handle_root);

  httpServer.begin();

  Serial.println("Adding HTTP server to MDNS...");

  MDNS.addService("http", "tcp", 80);

  Serial.printf("HTTPUpdateServer ready! Open http://%s.local/update in your browser\n", HOSTNAME);

}

void loop() {

  client.loop();

  httpServer.handleClient();

  MDNS.update();