#include <WiFi.h>
#include <PubSubClient.h>

#define WIFI_SSID         "Wokwi-GUEST"
#define WIFI_PASSWORD     ""
#define TOKEN             "6tKKTUEYD5GP1F0VBKdH" // BUXREKA ACC
#define THINGSBOARD_SERVER "demo.thingsboard.io"
#define THINGSBOARD_PORT   1883  // Default MQTT port

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");

  // Connect to Wi-Fi
  WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
  Serial.print("Connecting to ");
  Serial.print(WIFI_SSID);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());

  client.setServer(THINGSBOARD_SERVER, THINGSBOARD_PORT);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }

  client.loop();

  if (digitalRead(34) == LOW) {
    digitalWrite(16, LOW);
    digitalWrite(17, LOW);
    digitalWrite(18, LOW);
    digitalWrite(19, LOW);
    sendToThingsBoard("state", "off");
  } else {
    digitalWrite(16, HIGH);
    delay(1000);
    digitalWrite(17, HIGH);
    delay(1000);
    digitalWrite(18, HIGH);
    delay(1000);
    digitalWrite(19, HIGH); 
    delay(1000);
    sendToThingsBoard("state", "on");
  }
}

void sendToThingsBoard(const char* attribute, const char* value) {
  char payload[100];
  sprintf(payload, "{\"%s\":\"%s\"}", attribute, value);
  client.publish("v1/devices/me/telemetry", payload);
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client", TOKEN, NULL)) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}