//Generated Date: Wed, 23 Oct 2024 09:08:21 GMT

char led = 0;
#include <WiFi.h>
#include <PubSubClient.h>
#define MQTT_USER ""
#define MQTT_PASSWORD ""

char _lwifi_ssid[] = "Wokwi-GUEST";
char _lwifi_pass[] = "";
const char* mqtt_server = "broker.MQTTGO.io";
const unsigned int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient mqtt_client(espClient);
String mqtt_data = "";

void mqtt_sendText(String topic, String text) {
    String clientId = "CN017";
    if (mqtt_client.connect(clientId.c_str(), MQTT_USER, MQTT_PASSWORD)) {
      mqtt_client.publish(topic.c_str(), text.c_str());
    }
}

void reconnect() {
  while (!mqtt_client.connected()) {
    String mqtt_clientId = "CN017";
    if (mqtt_client.connect(mqtt_clientId.c_str(), MQTT_USER, MQTT_PASSWORD)) {
      mqtt_client.subscribe("lhucin/D112IOT/CN017/Ch01/btn");
      mqtt_client.subscribe("lhucin/D112IOT/CN017/Ch01/led");
    } else {
      delay(5000);
    }
  }
}

void setup()
{
  Serial.begin(9600);

  randomSeed(micros());
  mqtt_client.setServer(mqtt_server,mqtt_port);
  mqtt_client.setCallback(callback);
  //mqtt_client.setBufferSize(1024);

  Serial.println("Wifi...");
  WiFi.disconnect();
  WiFi.softAPdisconnect(true);
  WiFi.mode(WIFI_STA);
  WiFi.begin(_lwifi_ssid, _lwifi_pass);
  while (WiFi.status() != WL_CONNECTED) { delay(500); }
  delay(300);
  Serial.println("MQTT...");
  Serial.println("MQTT OK");
  pinMode(2, OUTPUT);
}

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

void callback(char* topic, byte* payload, unsigned int length) {
  mqtt_data = "";
  for (int ci = 0; ci < length; ci++) {
    char c = payload[ci];
    mqtt_data+=c;
  }
  Serial.println((mqtt_data));
  if (String(topic)=="lhucin/D112IOT/CN017/Ch01/btn"&&mqtt_data!="[]") {
    led = (mqtt_data).charAt(0);
    if (led == '1') {
      digitalWrite(2, HIGH);
      mqtt_sendText("lhucin/D112IOT/CN017/Ch01/led", "1");
      Serial.println("LED ON");
    } else if (led == '0') {
      digitalWrite(2, LOW);
      mqtt_sendText("lhucin/D112IOT/CN017/Ch01/led", "0");
      Serial.println("LED OFF");
    }
  }
}