//4-Digit 7 Segment LED Display & MQTT

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

// 函式庫 TM1637
#include <TM1637Display.h>
// 設定顯示模組連接到ESP32的接腳
const int CLK = 13; //Set the CLK pin connection to the display
const int DIO = 12; //Set the DIO pin connection to the display
// 創建 TM1637Display 物件
TM1637Display display = TM1637Display(CLK, DIO);

// an array that sets individual segments per digit to display the word "dOnE"
const uint8_t done[] = {
  SEG_B | SEG_C | SEG_D | SEG_E | SEG_G,         // d
  SEG_A | SEG_B | SEG_C | SEG_D | SEG_E | SEG_F, // O
  SEG_C | SEG_E | SEG_G,                         // n
  SEG_A | SEG_D | SEG_E | SEG_F | SEG_G          // E
};

// degree celsius symbol
const uint8_t celsius[] = {
  SEG_A | SEG_B | SEG_F | SEG_G,  // Degree symbol
  SEG_A | SEG_D | SEG_E | SEG_F   // C
};



// Update these with values suitable for your network.
const char* ssid =  "Wokwi-GUEST";   // your network SSID (name) 
const char* password = "";   // your network password

const char* mqtt_server = "broker.mqttgo.io";
//const char* mqtt_server = "iot.eclipse.org";

WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

//================================================================
void setup_wifi() {
   delay(100);
  // We start by connecting to a WiFi network
    Serial.print("Connecting to ");
    Serial.println(ssid);
    WiFi.begin(ssid, password);
    while (WiFi.status() != WL_CONNECTED) 
    {
      delay(500);
      Serial.print(".");
    }
  randomSeed(micros());
  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}
//================================================================
void callback(char* topic, byte* payload, unsigned int length) 
{
  Serial.print("Command from MQTT broker is : [");
  Serial.print(topic);
  Serial.println();
  Serial.print(" publish data is:");
  String message="";
  for(int i=0;i<length;i++)
  {
    message += ((char)payload[i]);
    Serial.print(payload[i]);
  }

  int show= message.toInt();
  Serial.println();
  display.showNumberDec(show);

} //end callback
//================================================================
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) 
  {
    Serial.print("Attempting MQTT connection...");
    // Create a random client ID
    String clientId = "ESP32Client-";
    clientId += String(random(0xffff), HEX);
    // Attempt to connect
    //if you MQTT broker has clientID,username and password
    //please change following line to    if (client.connect(clientId,userName,passWord))
    if (client.connect(clientId.c_str()))
    {
      Serial.println("connected");
     //once connected to MQTT broker, subscribe command if any
      client.subscribe("alex9ufo/Command");
    } else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 6 seconds before retrying
      delay(6000);
    }
  }
} //end reconnect()
//================================================================
void setup() {
  Serial.begin(115200);
  setup_wifi();
  client.setServer(mqtt_server, 1883);

  display.clear();
  display.setBrightness(7); // set the brightness to 7 (0:dimmest, 7:brightest)
  display.showNumberDec(8888);

}
//================================================================
void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.setCallback(callback);
  client.loop();

}