printing QR codes through an ESC/POS thermal printer?

Question

I\'m printing some QR codes (from a Ruby script) writing ESC/POS commands to a Epson TM-T20 thermal printer.

BTW, I\'m writing a simple ESC/POS commands printer \"d

Answer 1

This is in ESC/POS:

GS "(k"  4 0 49 65 50 0
GS "(k"  3 0 49 67  5
GS "(k"  3 0 49 69 48 
GS "(k" 28 0 49 80 48 "https://stackoverflow.com/"
GS "(k"  3 0 49 81 48