The tags required are MIFARE Ultralight C compatible tags. NTAG215 tags have been tested and work. NTAG213 tags have been tested and work. Tags need at least 36 pages, 144 byte user r/w area.

Abstract: In a shopping mart, imagine ten people waiting in line. If the first five people have many items in their carts, the last person with only one or two items may wait a long time to pay. To ...