I tried generating a QR code here
https://www.qrcode-monkey.com/ and it generated a code for me, but Jevois cannot recognise it. ( there is no attachment option, with which I can send you the QR code image)
It can recognise no barcodes at all.
Looks like it an only do specific types of Barcodes/QR codes perhaps.
(this Question editor needs at attachment option, cant find one)