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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
// Agregue su MQTT Broker aquí:
const char* mqtt_server = "66.29.142.107";
const int relay1 = 15;
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  pinMode(relay1, OUTPUT);
}

void setup_wifi() {
  delay(10);
  Serial.println();
  Serial.print("Conectando a ");
  Serial.println(ssid);

  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.print("IP: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Intentando conectar a MQTT broker...");
    if (client.connect("ESP32Client")) {
      Serial.println("conectado");
      // Subscribirse a un tópico
      client.subscribe("relay1");
    } else {
      Serial.print("fallido, rc=");
      Serial.print(client.state());
      Serial.println(" intente de nuevo en 5 s");
      // Espera 5 segundos antes de reintentar
      delay(5000);
    }
  }
}

void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("Mensaje recibido en el topico: ");
  Serial.print(topic);
  Serial.print(". Mensaje: ");
  String messageTemp;
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  if (String(topic) == "relay1") {
    Serial.print("Cambiando la salida a: ");
    if(messageTemp == "on"){
      Serial.println("on");
      digitalWrite(relay1, HIGH);
    }
    else if(messageTemp == "off"){
      Serial.println("off");
      digitalWrite(relay1, LOW);
    }
  }  
}

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

  long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
  }
}