@VyankeshH I have implemented this function with some help from node-thermal-printer

  /**
   *
   * @param code - string of the QR code
   * @param version - QR model: number 1, 2
   * @param level - correction level: L - 7%,  M - 15%, Q - 25%, H - 30%
   * @param size - QR size, number between 1 - 16
   * @returns {Array}
   */
  static printQR(code: string, version?: number, level?: string, size?: number): any[] {
    const buffer: any[] = [];

    // center the QR Code
    buffer.push(...config.TXT_ALIGN_CT);
    buffer.push(...config.HW_SELECT);

    // [Name] Select the QR code model
    // [Code] 1D 28 6B 04 00 31 41 n1 n2
    // n1
    // [49 x31, model 1]
    // [50 x32, model 2]
    // [51 x33, micro qr code]
    // n2 = 0
    if (version) {
      if (version === 1) {
        buffer.push(...config.QRCODE_MODEL1);
      } else {
        buffer.push(...config.QRCODE_MODEL2);
      }
    } else {
      buffer.push(...config.QRCODE_MODEL2);
    }

    // [Name]: Set the size of module
    // 1D 28 6B 03 00 31 43 n
    // n depends on the printer
    if (size) {
      const command: string = 'QRCODE_CELLSIZE_'.concat(size.toString());
      buffer.push(...config[command]);
    } else {
      buffer.push(...config.QRCODE_CELLSIZE_3);
    }


    // [Name] Select the error correction level
    // 1D 28 6B 03 00 31 45 n
    // n
    // [48 x30 -> 7%]
    // [49 x31-> 15%]
    // [50 x32 -> 25%]
    // [51 x33 -> 30%]
    if (level) {
      const command: string = 'QRCODE_CORRECTION_'.concat(level.toUpperCase());
      buffer.push(...config[command]);
    } else {
      buffer.push(...config.QRCODE_CORRECTION_M);
    }


    // [Name] Store the data in the symbol storage area
    // 1D 28  6B pL pH 31 50 30 d1...dk
    const s: number = code.length + 3;
    const pL: number = Math.floor(s % 256);
    const pH: number = Math.floor(s / 256);
    buffer.push(...[0x1d, 0x28, 0x6b, pL, pH, 0x31, 0x50, 0x30]);
    // convert Buffer to array
    const codeBuf: Buffer = new Buffer(code);
    const codeArr = Array.prototype.slice.call(codeBuf, 0);
    buffer.push(...codeArr);


    // buffer.push(...new Buffer((pL + pH * 256) - 3)); // CITIZEN PRINTER ONLY


    // [Name] Print the symbol data in the symbol storage area
    // 1D 28 6B 03 00 31 51 m
    buffer.push(...config.QRCODE_PRINT);

    return buffer;
  }

QR code not printed #9

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