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

WiFiClient ESPClient;
PubSubClient mqttClient(ESPClient);

void getNetworkConnection(const char* ssid, const char* pass) {
  WiFi.begin(ssid, pass);
  Serial.print("Connecting to " + String(ssid));
  while (WiFi.status() != WL_CONNECTED) {
    Serial.print(".");
    delay(1000);
  }
  Serial.println("Connected to " + WiFi.localIP().toString());
}

String generateUniqueID() {
  String uniqueID = "ESP32-";
  uint64_t chipID = ESP.getEfuseMac();
  String chipIDstr = String(chipID, HEX);
  return uniqueID;
}

void getBrokerConnection() {
  while (!mqttClient.connected()) {
    Serial.print("Connecting to MQTT broker...");
    // Generate a unique client ID
    String clientId = generateUniqueID();
    if (mqttClient.connect(clientId.c_str())) {
      Serial.println("connected" + clientId);
    } else {
      Serial.print("failed with state ");
      Serial.print(mqttClient.state());
      Serial.println(" - retrying in 5 seconds");
      delay(5000);
    }
  }
}

void setup() {
  Serial.begin(115200);
  getNetworkConnection("Wokwi-GUEST", "");
  mqttClient.setServer("broker.hivemq.com", 1883);
}

void loop() {
  if (!mqttClient.connected()) {
    getBrokerConnection();
  }
  mqttClient.loop();
}