'MTP-3 bluetooth thermal printer print qr code

Im trying to make an android application in xamarin that can print qr code, im using MTP-3 GOOJPRINT thermal printer. I got the printer plain text already , now im trying to print barcode/qr code.

using Com.Lvrenyang.IO;
using Java.Util;
[assembly: Xamarin.Forms.Dependency(typeof(AndroidBluetoothService))]
namespace QRPrint.Droid.Common
    {
    public void Print(string deviceName )
    {
        Pos pos = new Pos();
        Label1 lb1 = new Label1();
        BTPrinting btprint = new BTPrinting();

        byte[] outputQRVal = Encoding.UTF8.GetBytes("41v41as-51fsd-315");
        lb1.DrawBarcode(0, 0, 0, 0 ,0, 0, outputQRVal); // ????

        BluetoothDevice device = (from bd in bluetoothAdapter?.BondedDevices where bd?.Name == deviceName select bd).FirstOrDefault();
        btprint.Open(device.Address);
        btprint.Write(outputQRVal, 0, outputQRVal.Length);
        btprint.Close();
        }
    }

Here is the library and printer of the Thermal Printer: http://xmjprt.com/2457746-2457746.html

Anyone know how to print out the barcode/qr?

c++sharpxamarin.android


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