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

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

// MQTT broker
const char* mqtt_server = "broker.mqttdashboard.com";
const char* mqtt_topic = "wokwi-weather";

WiFiClient espClient;
PubSubClient client(espClient);

void callback(char* topic, byte* payload, unsigned int length) {
  String message;
  for (unsigned int i = 0; i < length; i++) {
    message += (char)payload[i];
  }
  Serial.println("Received: " + message);
}

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

  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  while (WiFi.status() != WL_CONNECTED) {
    delay(200);
    Serial.print(".");
  }
  Serial.println(" Connected!");

  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);

  while (!client.connected()) {
    Serial.print("Connecting to MQTT...");
    if (client.connect("ESP32WeatherClient")) {
      Serial.println(" Connected!");
      client.subscribe(mqtt_topic);
      Serial.println("Subscribed to topic: " + String(mqtt_topic));
    } else {
      Serial.print(" Failed, rc=");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void loop() {
  client.loop(); // handle incoming messages
}