NFC standard has three distinct modes of operation
depending on what kind of information is to be exchanged.
Perhaps the most commonly used is peer-to-peer mode which
allows the two NFC enabled devices to transmit data between
each other. In peer to peer both devices are active when they
sends data and become passive when they receive data.
Read/write mode is the other mode of operation in which the
active NFC device possibly mobile phone established a link
with another device to read data from it. The last mode of operation is card emulation where the NFC enabled device can
act like a contactless credit card which can be used for making
payments or to tap it into public transport systems [7].