PDF menus, as well. In 2006, I built some hardware to scan Bluetooth IDs and published a little appliance to record them at the front of one of our restaurants

PDF menus, as well. In 2006, I built some hardware to scan Bluetooth IDs and published a little appliance to record them at the front of one of our restaurants and push a menu with a coupon to uniques. Customers were ambivalent at best. I ended up hating it, though. It was a cool idea at the time, people were still wearing Bluetooth earpieces and IR beaming each other their contact cards after all, but it was easy to decide that as non-opt-in data collection, it violated volition. QR code menus don't all suck, but if you're going to do it, have house wifi, make the codes unique to the tables, and just throw up a captive portal patrons can go ahead and order from. Go "serverless" or not at all.