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

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);

// Pines del sensor
const int trigPin = 5;
const int echoPin = 18;

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

void setup() {
  Serial.begin(115200);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  setup_wifi();
  client.setServer(mqtt_server, mqtt_port);
}

void loop() {
  if (!client.connected()) {
    while (!client.connected()) {
      client.connect("ESP32-Sensor");
    }
  }

  client.loop();

  // Medir distancia
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);

  long duration = pulseIn(echoPin, HIGH);
  float distance = duration * 0.034 / 2;

  Serial.print("Distancia: ");
  Serial.println(distance);

  if (distance < 20.0) {
    client.publish(topic, "adelante");
  } else {
    client.publish(topic, "stop");
  }

  delay(1000);
}