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

#define TRIG_PIN 18 // ESP32 pin GPIO18 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 5 // ESP32 pin GPIO5 connected to Ultrasonic Sensor's ECHO pin
float duration_us, distance_cm;

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "test.mosquitto.org";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];
WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  delay(10);
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(ssid);
  wifiConnect();
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address:");
  Serial.println(WiFi.localIP());
  Serial.println(WiFi.macAddress());
  stMac = WiFi.macAddress();
  stMac.replace(":", "_");
  Serial.println(stMac);
  
  client.setServer(mqttServer, port);
}

void wifiConnect() {
  WiFi.mode(WIFI_STA);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
}

void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      delay(5000);
    }
  }
}

void loop() {
  delay(5000); // Puedes ajustar el intervalo de lectura del sensor
  // Lectura de temperatura desde el sensor DHT22


  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration_us = pulseIn(ECHO_PIN, HIGH);
  distance_cm = 0.017 * duration_us;

  // Publicación de la temperatura en un tema MQTT
  if (client.connected()) {
    String analogValueString = String(distance_cm, 2);
    client.publish("U1", analogValueString.c_str());
    Serial.println(distance_cm);
  }
  if (!client.connected()) {
    mqttReconnect();
  }
  client.loop();
}