// To view the data:

// 1. Go to http://www.hivemq.com/demos/websocket-client/
// 2. Click "Connect"
// 3. Under Subscriptions, click "Add New Topic Subscription"
// 4. In the Topic field, type "esp32/test" then click "Subscribe"

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

const char *mqtt_broker = "broker.mqttdashboard.com";
const char *topic = "esp32/test";
const char *mqtt_username = "";
const char *mqtt_password = "";
const int mqtt_port = 1883;

WiFiClient espClient;
PubSubClient client(espClient);

void setup() {
  Serial.begin(9600);
  Serial.println("Connecting to WiFi");
  WiFi.begin("Wokwi-GUEST", "", 6);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println();
  Serial.println("Connected!");

  client.setServer(mqtt_broker, mqtt_port);
  while (!client.connected()) {
      String client_id = "esp32-client-";
      client_id += String(WiFi.macAddress());
      Serial.printf("The client %s is connecting to the public mqtt broker\n", client_id.c_str());
      if (client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
          Serial.println("Public hivemq broker connected!");
      } else {
          Serial.printf("Failed with state %s\n", client.state());
          delay(2000);
      }
  }

  // publish and subscribe
  client.publish(topic, "Hello");
  client.subscribe(topic);

}

// void callback(char *topic, byte *payload, unsigned int length) {
//   Serial.print("Message arrived in topic: ");
//   Serial.println(topic);
//   Serial.print("Message:");
//   for (int i = 0; i < length; i++) {
//       Serial.print((char) payload[i]);
//   }
//   Serial.println();
//   Serial.println("-----------------------");
// }

void loop() {
  // delay(100); // TODO: Build something amazing!
  client.loop();
}