qrencode does not work with local linux vt/console

[devZer0]

when using pivpn qrcode feature for wireguard, output is broken like this (can't scan the code), when linux console is being used

there is a pull request at
#19

telling

"This doubles the density of QR codes printed on terminals...."

true. this is why pivpn is using utf8 by default

"...., and should be supported by virtually all modern terminals, including xterm, gnome-terminal and the Linux console."

at least concerning linux console, this does not seem to be true

also see https://forum.proxmox.com/threads/qrencode-is-broken-in-proxmox-kvm-qemu-vnc-console.134104/

"No, it's your linux console. Every time you use a gui console like iTerm, the characters are rendered in your guest with your guest font, which can display UTF8 characters, the linux console, or more general, the used fonts are not made for this. They only have some special characters, not all of them. It's a console and not your favorite chat tool"

i think qrencode should perhaps tell when it can't work with a linux console, instead of printing garbage