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

const int IN1 = 2;
const int IN2 = 4;

const char* ssid = "ALBER 2.4G";
const char* password = "asrael2050";

const char* mqtt_server = "broker.emqx.io";
const int mqtt_port = 1883;
const char* topic = "motor/control";

WiFiClient espClient;
PubSubClient client(espClient);

void callback(char* topic, byte* payload, unsigned int length) {
  String msg;
  for (int i = 0; i < length; i++) {
    msg += (char)payload[i];
  }
  msg.trim();

  if (msg == "adelante") {
    digitalWrite(IN1, HIGH);
    digitalWrite(IN2, LOW);
  } else if (msg == "stop") {
    digitalWrite(IN1, LOW);
    digitalWrite(IN2, LOW);
  }
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32-Motor")) {
      client.subscribe(topic);
    } else {
      delay(2000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  pinMode(IN1, OUTPUT);
  pinMode(IN2, OUTPUT);

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }

  client.setServer(mqtt_server, mqtt_port);
  client.setCallback(callback);
}

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