takeone-attendance/Firmware Code/ESP8266_I2C_LCD_SPI_RFID/WIFI.ino

  /* ===================================================================================
   *  THIS SECTION IS FOR METHODES AND FUNCTIONS
   * =================================================================================*/

  void setupWiFi()
  {
    // Turn On LCD
    lcd_light_on();
    
    // Printing Device Mac Address
    Serial.println();
    Serial.println("-----------------------------------------------------------");
    Serial.println(" TAKEONE WIFI MANAGER STARTING ");
    Serial.println("-----------------------------------------------------------");
    //Serial.println("TAKEONE: MAC Address:");
    //Serial.println("TAKEONE: " + devMac);

    // Starting File System
    Serial.println("TAKEONE: Mounting File System");
    read_config();
  
    // The extra parameters to be configured (can be either global or just in the setup)
    WiFiManagerParameter custom_devID("devID", "Club UserID", devID.c_str(), 100);
    WiFiManagerParameter custom_devPASS("devPASS", "Club Password", devPASS.c_str(), 100);
  
    //WiFiManager Local intialization. Once its business is done, there is no need to keep it around
    WiFiManager wifiManager;
  
    //set config save notify callback
    wifiManager.setSaveConfigCallback(saveConfigCallback);
    
    //add all your parameters here
    //wifiManager.addParameter(&custom_server);
    wifiManager.addParameter(&custom_devID);
    wifiManager.addParameter(&custom_devPASS);

    // Display Booting Up Message
    lcd_clear();
    lcd_line1("TAKEONE WiFi");
    lcd_line2("RFID < READY >");
    delay(2500);
    
    // Reset Settings
    if(button.pressed())
    {
      reconfig();
    }

    // Display On OLED
    lcd_clear();
    lcd_line1("CONNECTING TO");
    lcd_line2("WiFi ROUTER");
    delay(2500);

    // Trying To Connect To Network Or Reconfig
    if (!wifiManager.autoConnect(devName.c_str())) {
      lcd_clear();
      lcd_line1("CONNECTION TO");
      lcd_line2("ROUTER FAILD!");
      Serial.println("failed to connect and hit timeout");
      delay(3000);
      //reset and try again, or maybe put it to deep sleep
      lcd_clear();
      lcd_line1("< REBOOTING >");
      delay(3000);
      ESP.restart();
    }

    // Copying The SSID & Password Of Successfully Connected Network
    WiFi_SSID = wifiManager.getSSID();
    WiFi_PASS = wifiManager.getPassword();

    lcd_clear();
    lcd_line1("CONNECTION");
    lcd_line2("< SUCCESSFUL >");
    delay(2500);

    lcd_clear();
    lcd_line1("IP ADDRESS");
    lcd_line2(WiFi.localIP().toString());
    delay(2500);

    //read updated parameters
    devID   = custom_devID.getValue();
    devPASS = custom_devPASS.getValue();
  
    //save the custom parameters to FS
    if (shouldSaveConfig) {
      Serial.println("saving config");
      DynamicJsonDocument json(4000);

      // Assignning Parameters To JSON
      json["devID"]   = devID;
      json["devPASS"] = devPASS;

      // Opening The File For Reading
      File configFile = SPIFFS.open("/config.json", "w");

      // Checking If File Opened
      if (!configFile) {
        Serial.println("failed to open config file for writing");
      }

      // Print JSON Content On Monitor
      String memory = "";
      serializeJson(json, memory);

      // Print To Serial Monitor
      Serial.println(memory);

      // Write To File
      configFile.print(memory);

      // Closing Config File
      configFile.close();

      // Clearing The Buffer Memory
      json.clear();
      //end save
    }

    // Display Data
    Serial.println("TAKEONE: divID          : " + devID);
    Serial.println("TAKEONE: divPASS        : " + devPASS);
    Serial.println("TAKEONE: divMAC         : " + devMac);
    
    // End Of WiFi Manager
    Serial.println("-----------------------------------------------------------");
  
    // Clearing LCD
    lcd_clear();
    
    // Turnning Off LCD Light
    lcd_light_off();
  }

  /* ===================================================================================
   *  THIS SECTION IS FOR METHODES AND FUNCTIONS
   * =================================================================================*/

  void saveConfigCallback () 
  {
    Serial.println("Should Save Config File");
    shouldSaveConfig = true;
  }

  /* ===================================================================================
   *  THIS SECTION IS FOR METHODES AND FUNCTIONS
   * =================================================================================*/

  void reconfig() 
  { 
    lcd_clear();
    lcd_light_on();
    lcd_line1("Reset WiFi");
    lcd_line2("Settings");

    // Make Sure That Spiffs Started
    if(!strtFS) {
      delay(1000);
      wipeFS;
    }
    
    WiFiManager wifiManager;
    delay(1500);
    wifiManager.resetSettings();
    lcd_clear();
    lcd_line1("Formating SPIFFS");
    delay(1500);
    
    // LCD Display
    lcd_clear();
    lcd_line1(lcd_center("< REBOOTING >"));
    delay(1500);
    lcd_light_off();
    ESP.restart();
  }

  /* ===================================================================================
   *  THIS SECTION IS FOR METHODES AND FUNCTIONS
   * =================================================================================*/

  bool checkWiFi()
  {
    if(WiFi.status() == WL_CONNECTED) 
    {
      return true;
    } 
    else 
    {
      return false;
    }
  }

  /* ===================================================================================
   *  Reading Config File
   * =================================================================================*/
   
  void read_config() 
  {   
    // After Suceessfull Do The Following
    if(strtFS) 
    {
      Serial.println(" -> Mounted File System");
      if (SPIFFS.exists("/config.json")) {
        //file exists, reading and loading
        Serial.println(" -> Reading Config File");
        File configFile = SPIFFS.open("/config.json", "r");
        if (configFile) {
          //Serial.println(" -> Opened Config File");
          size_t size = configFile.size();
          // Allocate a buffer to store contents of the file.
          std::unique_ptr<char[]> buf(new char[size]);
          configFile.readBytes(buf.get(), size);

          // Display The Read Data
          String mydata = String(buf.get());
          mydata.trim();
          //Serial.println(" -> My Stored Data : " + mydata);

          // JSON Document
          DynamicJsonDocument   json(2000);
          DeserializationError  error = deserializeJson(json, mydata);
          
          if (!error) {
            devID   = json["devID"].as<String>();
            devPASS = json["devPASS"].as<String>();
          } else {
            Serial.println(" -> failed to load json config");
          }

          // Clearing JSON Memory
          json.clear();
        }
      }
    } else {
      Serial.println(" -> failed to mount FS");
    }
  }