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

#define DHTPIN 15
#define DHTTYPE DHT22

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.hivemq.com";

DHT dht(DHTPIN, DHTTYPE);
WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  dht.begin();

  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi OK");

  client.setServer(mqtt_server, 1883);

  while (!client.connected()) {
    if (client.connect("ESP32_DHT22")) {
      Serial.println("MQTT OK");
    } else {
      delay(1000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    client.connect("ESP32_DHT22");
  }
  client.loop();

  float temp = dht.readTemperature();
  float hum  = dht.readHumidity();

  if (temp > -40.0 && temp < 80.0 && hum > 0.0 && hum <= 100.0) {
    String tStr = String(temp, 2);
    String hStr = String(hum, 2);
    client.publish("dht22/temperatura", tStr.c_str());
    client.publish("dht22/humedad", hStr.c_str());
    Serial.print("T: "); Serial.print(temp);
    Serial.print(" H: "); Serial.println(hum);
  }

  delay(2000);
}