#include <WiFi.h>
#include "PubSubClient.h"
#include <LiquidCrystal_I2C.h>

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.emqx.io";
int port = 1883;
String stMac;
char mac[50];
char clientId[50];
WiFiClient espClient;
PubSubClient client(espClient);
const int ledPin = 2;

LiquidCrystal_I2C LCD = LiquidCrystal_I2C(0x27, 16, 2);
const int DHT_PIN = 15;

void setup() {
  Serial.begin(115200);
  // randomSeed(analogRead(0));
  delay(10);
  Serial.println();
  Serial.print("Conectando a ");
  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);
  client.setCallback(callback);
  pinMode(ledPin, OUTPUT);

  //pantalla
  LCD.init();
  LCD.backlight();
  LCD.setCursor(16, 2);
}

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

//suscribe
void mqttReconnect() {
  while (!client.connected()) {
    Serial.print("Intentando la conexión MQTT...");
    long r = random(1000);
    sprintf(clientId, "clientId-%ld", r);
    if (client.connect(clientId)) {
      Serial.print(clientId);
      Serial.println(" connectado");
      client.subscribe("topicName/led");
    } else {
      Serial.print("error, rc=");
      Serial.print(client.state());
      Serial.println(" Intentando en 5 segundos");
      delay(5000);
    }
  }
}

// el que publica
void callback(char* topic, byte* message, unsigned int length) {
  Serial.print("El mensaje arribo al topico: ");
  Serial.print(topic);
  //Serial.print(". Mensaje: ");
  String stMessage;
  
  for (int i = 0; i < length; i++) {
    // Serial.print("men"+i+(char)message[i]);
    Serial.print((char)message[i]);
    stMessage += (char)message[i];

  }
  //Muestra el mensaje en la pantalla
  LCD.setCursor(0, 0);
  LCD.print(stMessage);
  Serial.println(stMessage);
  Serial.println();
  delay(5000);

  
}

void loop() {
  // delay(10);
  if (!client.connected()) {
    mqttReconnect();
  }
  //limpia el texto del lcd
  LCD.clear();
  client.loop();



}