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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqtt_server = "broker.emqx.io";
const int DHT_PIN = 15;

WiFiClient espClient;
PubSubClient client(espClient);
DHTesp dht;

int lastMsg = 0;

void setup_wifi() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
  }
  Serial.println("WiFi connected");
  Serial.println(WiFi.localIP());
}


void callback(char* topic, byte* payload, int length) {
  
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
}

void reconnect() {
  while (!client.connected()) {
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);

    if (client.connect(clientId.c_str())) {
      Serial.println("Connected");
      client.subscribe("/Subscribe");
    } else {
      delay(5000);
    }
  }
}

void setup() {
  pinMode(2, OUTPUT);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
  dht.setup(DHT_PIN, DHTesp::DHT22);
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();

  unsigned long now = millis();
  if (now - lastMsg > 2000) {
    lastMsg = now;
    TempAndHumidity data = dht.getTempAndHumidity();
    String tempStr = String(data.temperature, 2);
    client.publish("/Temperature", tempStr.c_str());
    String humStr = String(data.humidity, 1);
    client.publish("/Humidity", humStr.c_str());
  }
}