Print qrcode receipt on rongta thermal printer using esp32

Question

As the title says I want to print qr code on my RONGTA RP330 printer. ah I connected wire from esp32 to the Rx and Tx pin of the printer motherboard.

For now I'm doing this:

#include <Arduino.h>
#include <HardwareSerial.h>
#include <Wire.h>
#include "qrcode.h"

const byte rxPin = 16;
const byte txPin = 17;

HardwareSerial mySerial(1);

QRCode qrcode;
String paypalLink = "https://paypal.me/username";

void setup() {
  Serial.begin(115200);
  mySerial.begin(19200, SERIAL_8N1, rxPin, txPin);
  delay(1000); // Wait for the printer to initialize

  mySerial.write(27); // ESC command
  mySerial.write('3'); // Set line spacing
  mySerial.write(10);   // -2 dots (adjust as needed for tighter overlap)

  uint8_t qrcodeData[qrcode_getBufferSize(3)];
  qrcode_initText(&qrcode, qrcodeData, 3, 0, paypalLink.c_str() );

  int scale = 2; // Change this for different sizes
  for (uint8_t y = 0; y < qrcode.size; y++)
  {
    for (uint8_t x = 0; x < qrcode.size; x++)
    {
      if (qrcode_getModule(&qrcode, x, y))
      {
          mySerial.write(219);
          mySerial.write(219);
      } else {
        mySerial.print("  ");
      }
    }
    mySerial.print("\n");
  }

  for (int i = 0; i < sizeof(qrcodeData); i++) {
    Serial.print(qrcodeData[i], HEX);
    Serial.print(" ");
  }

  mySerial.write(219);
  mySerial.print("\n");
  mySerial.print("Hello, Rongta!\n");
  mySerial.print("Hello, Rongta!\n");
  
  mySerial.write(27);  // ESC command
  mySerial.write('d'); // Paper feed
  mySerial.write(5);   // Feed 5 lines
  mySerial.write(29);  // GS command
  mySerial.write('V'); // Paper feed and cut
  mySerial.write(66);  // Feed length
  mySerial.write(1);   // Cut type (0: full cut, 1: partial cut)

  delay(1000); // Wait for the printing to complete before looping or exiting
}

void loop() {
}

But this code prints it as black box and there is line gaps:

#include <Adafruit_Thermal.h>

const byte rxPin = 16;  // Define your RX pin
const byte txPin = 17;  // Define your TX pin

HardwareSerial mySerial(1);

Adafruit_Thermal printer(&mySerial);

void setup() {
  Serial.begin(115200);
  mySerial.begin(19200, SERIAL_8N1, rxPin, txPin);
  delay(1000); // Wait for the printer to initialize

  // Set line spacing (0 dots for tighter spacing)
  setLineSpacing(0);

  // Print commands
  printer.println("Hello, Rongta!");

  // Print a custom graphic (replace with your graphic data)
  uint8_t graphicsData[] = {0x1C, 0x3E, 0x7F, 0x7F, 0x7F, 0x7F, 0x3E, 0x1C}; // Replace with your custom graphic data
  int width = 8; // Width of the graphic in dots
  int height = 8; // Height of the graphic in dots
  printer.printBitmap(width, height, graphicsData);

  // Reset line spacing to default (30 dots)
  setLineSpacing(30);

  // Cut paper
  printer.feed(5); // Feed a few lines before cutting
  printer.cut();
  
  delay(1000); // Wait for the printing to complete before looping or exiting
}

void loop() {
  // Your loop code here
}

void setLineSpacing(int spacingDots) {
  mySerial.write(27);  // ESC command
  mySerial.write('3'); // Set line spacing
  mySerial.write(spacingDots);  // Set the line spacing in dots
}

I also tried bitmap or send qr code using serial but didn't work need some help from experienced people.