// Referência:
// https://medium.com/engineering-iot/connecting-esp32-to-hivemq-for-real-time-iot-data-streaming-with-mqtt-8813f48cb1a4

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

#define DHTPIN 2
#define DHTTYPE DHT22
DHT dht(DHTPIN, DHTTYPE);

#define wifi_ssid "Wokwi-GUEST"
#define wifi_senha ""
const char *mqtt_servidor = "ac15cc038fc44e1d89ea8ff01708c3bd.s1.eu.hivemq.cloud";
const int   mqtt_porta = 8883;
const char *mqtt_usuario = "hivemq.webclient.1763425147712";
const char *mqtt_senha = "L4v#lKDrQ08<1S&gEo,m";

#define topico_temp "dhtclaudio/temperatura"
#define topico_umid "dhtclaudio/umidade"

WiFiClientSecure clienteEsp;
PubSubClient cliente(clienteEsp);

void setup() {
  Serial.begin(9600);
  dht.begin();
  setup_wifi();
  clienteEsp.setInsecure();
  cliente.setServer(mqtt_servidor, mqtt_porta);
  delay(2000);
}

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

  WiFi.begin(wifi_ssid, wifi_senha);

  int tentar = 0;
  while (WiFi.status() != WL_CONNECTED && tentar < 40) {
    delay(500);
    Serial.print(".");
    tentar++;
  }

  if (WiFi.status() != WL_CONNECTED) {
    Serial.println("\nFalha na conexão ao Wi-Fi");
    while (1) {
      delay(1000);
    }
  }
  Serial.print("\nConectado. IP: ");
  Serial.println(WiFi.localIP());
}

void loop() {
  float h = dht.readHumidity();
  float t = dht.readTemperature();

  Serial.print("Umidade: ");
  Serial.print(h);
  Serial.print(" %\t");
  Serial.print("Temperatura: ");
  Serial.print(t);
  Serial.print(" °C\n");
  while (!cliente.connected()) {
    if (cliente.connect("Claudio ESP32", mqtt_usuario, mqtt_senha)) {
      Serial.println("MQTT: Conectado"); 
    }
    else {
      Serial.print("Erro MQTT: ");
      Serial.println(cliente.state());
      delay(2000);
    }
  }
  Serial.println("MQTT: Enviando");
  cliente.publish(topico_temp, String(t).c_str(), true);
  cliente.publish(topico_umid, String(h).c_str(), true);
  cliente.disconnect();
  delay(120000); // 2 minutos
}