@Scotty42 I have used that barcode scanner to configure the QR scanner so will have to re-visit that approach. I have got the sound to go away but forgot how to do that. I have tried code to do that. Unfortunately some of these devices have a pre-state, like when powered up, which makes a sound before I can turn sound off. (Same with H-Driver and Atom Socket I just posted)
There is a mode to not accept those barcodes (so an end user cannot change some setting your code didn't want set).
Right now I use MQTT/BLE to set what it would scan - and then play that back from a button click. Basically store and re-play later - just like the QR code scanner achieves.
For my system, the QR code will invoke messages in my network - to turn on the lights, or feed the dog. I call this a Semantic Marker(R).
cheers,
thanks,
scott (also scotty)