Arduino NFC Reader Protocol

How to build a test circuit with a NFC controller and an Arduino Mega?
Arduino codes are included.

I. "Welcome" event from microcontroller

Example

//for RC522 modules:
c=welcome&id=KT75pc&type=OzNfcReader&pos=1&name=MyNfcReader&t=1
//for PN532 modules
c=welcome&id=fg7mtg&type=OzPN532Controller&pos=1&name=MyPN532Controller&t=1

Parameters

Parameter Type Range Functionality
c String 'welcome' Identifies the welcome message.
id String 6 characters (numbers, uppercase and lowercase characters) The ID of the device which is chosen by the microcontroller.
type String 'OzNfcReader' or 'OzPN532Controller' Determines the type of the device.
pos Byte 0-255 Determines the position of the device on the list of the ID manager of the microcontroller. Please make sure there are no other devices in the same position.
name (optional) String e.g. 'MyNfcReader' You can give default names for devices.
t Byte 0-255 Counts the number of events and responses sent combined. Counts from 0 to 255 then from 0 again.


II. Commands to microcontroller

None

III. Event from microcontroller

'NFC Reader' event

This event is generated every time an NFC card is swiped over the NFC reader. It forwards the hexadecimal data contained on the NFC card. Every byte represents a pair of hexadecimal numbers.

Example

c=nfcreader&idhex=f9c8fbfe&id=i479ZY&t=3

Parameters

Parameter Type Range Functionality
c String 'nfcreader' Identifies the event.
idhex String Any bytelength
(1 byte = 2 hex number)		 The read ID in hexadecimal format. They bytes are read from the NFC tag.
id String 6 characters (numbers, uppercase and lowercase characters) Identifies the device. The ID is never changed during communication.
t Byte 0-255 Counts the number of events and responses sent combined. Counts from 0 to 255 then from 0 again.

More information