#include <Adafruit_NeoPixel.h>

#define PIN_NEO_PIXEL 13  // The ESP32 pin GPIO16 connected to NeoPixel
#define NUM_PIXELS 50     // The number of LEDs (pixels) on NeoPixel LED strip

Adafruit_NeoPixel NeoPixel(NUM_PIXELS, PIN_NEO_PIXEL, NEO_GRB + NEO_KHZ800);

#include <WiFi.h>
#include <PubSubClient.h> //請先安裝PubSubClient程式庫
// ------ 以下修改成你自己的WiFi帳號密碼 ------
char* ssid = "Wokwi-GUEST"; //請修改為您連線的網路名稱
char* password = ""; //請修改為您連線的網路密碼
// ------ 以下修改成你MQTT設定 ------
char* MQTTServer = "mqttgo.io";//免註冊MQTT伺服器
int MQTTPort = 1883;//MQTT Port 除非加密，否則不用更改port
char* MQTTUser = "";//不須帳密
char* MQTTPassword = "";//不須帳密

//推播主題1:推播訊息(記得改Topic)
char* MQTTPubTopic = "Vegnutt/test";

long MQTTLastPublishTime;//此變數用來記錄推播時間
long MQTTPublishInterval = 10000;//每10秒推撥一次
//建立MQTT與聯網物件
WiFiClient WifiClient;
PubSubClient MQTTClient(WifiClient);

char buffer[10];
void setup() {
  NeoPixel.begin();  // initialize NeoPixel strip object (REQUIRED)
  Serial.begin(115200);
  //開始WiFi連線
  WifiConnecte();
  //開始MQTT連線
  MQTTConnecte();
}

void loop() {
  NeoPixel.clear();  // set all pixel colors to 'off'. It only takes effect if pixels.show() is called

  //如果WiFi連線中斷，則重啟WiFi連線
  if (WiFi.status() != WL_CONNECTED) { WifiConnecte(); }

  //如果MQTT連線中斷，則重啟MQTT連線
  if (!MQTTClient.connected()) {  MQTTConnecte(); }

  //如果距離上次傳輸已經超過10秒
  if ((millis() - MQTTLastPublishTime) >= MQTTPublishInterval ) {
    for (int pixel = 0; pixel < NUM_PIXELS; pixel++) {           // for each pixel
    NeoPixel.setPixelColor(pixel, NeoPixel.Color(255, 0, 0));  // it only takes effect if pixels.show() is called
    NeoPixel.show();                                           // update to the NeoPixel Led Strip
  }
    MQTTClient.publish(MQTTPubTopic, itoa(1234567 ,buffer,1));
    Serial.println("訊息已推播到MQTT Broker");
    MQTTLastPublishTime = millis(); //更新最後傳輸時間
  }

  MQTTClient.loop();//更新訂閱狀態
  delay(50);
}


//開始WiFi連線
void WifiConnecte() {
  //開始WiFi連線
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("WiFi連線成功");
  Serial.print("IP Address:");
  Serial.println(WiFi.localIP());
}

//開始MQTT連線
void MQTTConnecte() {
  MQTTClient.setServer(MQTTServer, MQTTPort);
  while (!MQTTClient.connected()) {
    //以亂數為ClietID
    String  MQTTClientid = "esp32-" + String(random(1000000, 9999999));//建立一個id，MQTT要求id要不一樣，所以使用亂數
    if (MQTTClient.connect(MQTTClientid.c_str(), MQTTUser, MQTTPassword)) {
      //連結成功，顯示「已連線」。
      Serial.println("MQTT已連線");
    } else {
      //若連線不成功，則顯示錯誤訊息，並重新連線
      Serial.print("MQTT連線失敗,狀態碼=");
      Serial.println(MQTTClient.state());
      Serial.println("五秒後重新連線");
      delay(5000);
    }
  }
}