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

const char* ssid = "Wokwi-GUEST";
const char* password = "";
const char* mqttServer = "broker.hivemq.com";
const int mqttPort = 1883;
const char* topic = "kelvin/wasteheat";

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(115200);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("WiFi connected");

  client.setServer(mqttServer, mqttPort);
}

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

  // Simulated waste heat energy data
  float energy_kWh = random(100, 200);  // 100-200 kWh
  String payload = "{\"component\": \"wasteheat\", \"energy\": " + String(energy_kWh) + "}";

  client.publish(topic, payload.c_str());
  Serial.println("Published: " + payload);

  delay(5000); // every 5 seconds
}

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