I use qr-codes to create some logs with the help of Node-Red.
Some info here:
My Node-Red and FarmOS project - #34 by pat
The qr-code takes me to a http-endpoint node, where the url is parsed, and actions are taken.
I only create logs with this. But I bet there’s other useful cases too.
I also had Node-Red to create logs for me if I send email to a certain address, and mark it with the Review flag. Then I can add resources, other flags etc later.