Adding badge sticker printer functionality for checkin #227
Description
As a devday visitor i'd like a faster checkin by scanning a qr-code an get a printed badge sticker as ticket because I don't like waiting in long queues and missing the keynote.
a possible solution could be:
- going to a checkin terminal (could be a smarphone and a badge printer with rapsi)
- scanning qr-code
- printer-client is subscibed via websocket to a mq and waiting for new scanevents for his assigned scanner
- if a new scan event is triggerd, printer-client will print the sticker and send a complete or error response
- after a complete response, qr-code will be tageed as scanned and/or used
- after a error response, rescan is needed
- it should be possible to reactivate tagged qr-codes if there any unexpected errors
- if my sticker is printed my checkin is completed