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

// Wi-Fi credentials
const char* ssid = "Wokwi-GUEST";  // Ya apna WiFi
const char* password = "";         // Empty for Wokwi

// MQTT broker
const char* mqtt_server = "broker.hivemq.com";

WiFiClient espClient;
PubSubClient client(espClient);

void setup_wifi() {
  delay(10);
  Serial.println("Connecting to WiFi...");
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

void reconnect() {
  while (!client.connected()) {
    Serial.print("Connecting to MQTT...");
    if (client.connect("ESP32-Publisher")) {
      Serial.println("connected");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      delay(2000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
}

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

  float temperature = random(23, 30) + random(0, 10) / 10.0;  // Random temperature
  String payload = String(temperature, 1);  // e.g. 28.5
  client.publish("sahil123/temperature", payload.c_str());

  Serial.print("Temp Sent: ");
  Serial.println(payload);
  delay(5000);  // Publish every 5 seconds
}