The string of characters (MAC address) is available in a csv file or on the clip board.
the label printer is a Dymo LabelWriter 450.
I created a label in the Dymo print software see example.
In order to stream line the process the test software of our IoT devices will read the MAC And and pushes it to a clipboard. (or CSV file) This data should automatically be filled in into the label (in the QR code and in the readable field. The real time production date should also be automatically shown. Finaly there is a field where per production run of eg 200pcs the customers name/code should be keyed in manually once per batch run.
All this at the click of one button.