//Generated Date: Wed, 25 Oct 2023 07:09:06 GMT

#include <WiFi.h>
#include <PubSubClient.h>
#define MQTT_USER "35834554644"
#define MQTT_PASSWORD "DKKF2UW42CU7BAAT59"

char _lwifi_ssid[] = "Wokwi-GUEST";
char _lwifi_pass[] = "";
char led = 0;
const char* mqtt_server = "iot.cht.com.tw";
const unsigned int mqtt_port = 1883;
WiFiClient espClient;
PubSubClient mqtt_client(espClient);
String mqtt_data = "";

void mqtt_sendText(String topic, String text) {
    String clientId = "28204";
    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 = "28204";
    if (mqtt_client.connect(mqtt_clientId.c_str(), MQTT_USER, MQTT_PASSWORD)) {
      Serial.println("MQTT OK");
  mqtt_client.subscribe("/v1/device/35834554644/sensor/led_s/rawdata");
    } 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....");
  while (WiFi.begin(_lwifi_ssid, _lwifi_pass) != WL_CONNECTED) { delay(1000); }
  Serial.println("MQTT....");
  pinMode(LED_BUILTIN, OUTPUT);
}

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

}

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)=="/v1/device/35834554644/sensor/led_s/rawdata"&&mqtt_data!="[]") {
    led = (mqtt_data).charAt(103);
    Serial.println((String("led_s:")+String(led)));
    if (led == '1') {
      digitalWrite(LED_BUILTIN, HIGH);
      Serial.println("ON");
    } else if (led == '0') {
      digitalWrite(LED_BUILTIN, LOW);
      Serial.println("OFF");
    }
  }
}