Application POC

[lukasznowarkiewicz]

Subject of this task is to achieve basic prove of concept - connection with USB AP122 reader, reading UID from card, reading NDEF URL record written with reference application.

[lukasznowarkiewicz]

ChatGPT conversation with debugging: https://chat.openai.com/share/81939500-1ece-49f6-9104-79e5c0044fac

[lukasznowarkiewicz]

Tried library pynfc:

• didn't work under Mac OS
• it declares poor compatibility with AC122 reader anyway

[lukasznowarkiewicz]

Card I've got it's NTAG 215, according to norm ISO 14443-3A. I does not use Mifare classic standard. Wrote sample URL using NFC Tools for Desktop application:

[lukasznowarkiewicz]

With application on commit https://github.com/lukasznowarkiewicz/NFCBusinessCard/commit/057c0596be93412d309b320849c2b88c63bed442 successfully read UID

Available readers: ['ACS ACR122U PICC Interface']
Using reader: ACS ACR122U PICC Interface
Enter the hex command to send (or type 'exit' to quit): FF B0 00 00 08
Card response: 04 0D 5C DD C1 79 00 00 Status words: 90 00

[lukasznowarkiewicz]

Info sent:

Enter the hex command to send (or type 'exit' to quit): FF B0 00 03 10
Card response: E1 10 3E 00 03 2A D1 01 26 55 01 67 69 74 68 75 Status words: 90 00

Interpretation:

• E1 10 3E 00 - These bytes are typically found at the beginning of the NDEF area:

  • E1 - Magic number indicating that the tag is formatted to store NDEF messages.
  • 10 - Version number indicating the NFC Forum Type 2 Tag specification the tag complies with.
  • 3E - Indicates the size of the data area that can store user data (in this case, it shows that the tag can store up to 62 blocks of data, where each block is typically 8 bytes, giving a total of 496 bytes).
  • 00 - A byte typically reserved for special features or configurations.

• 03 2A - NDEF message header:

  • 03 - This is the NDEF Message Begin Marker. It signifies the start of an NDEF message.
  • 2A - The length of the NDEF message that follows (42 bytes in this case).

• D1 01 26 - NDEF record header:

  • D1 - NDEF Record Header, which breaks down as follows:
  • D - Indicates this is a well-known record type.
  • 1 - Indicates this is the last record in the message.
  • 01 - Type Length (1 byte).
  • 26 - Payload Length (38 bytes).

• 55 - Type of the NDEF record:

  • 55 - Indicates that the record type is a URI (U for URI).

• 01 - URI Identifier Code:

  • 01 - Indicates that the URI is prefixed with "http://www."

• 67 69 74 68 75 62 - URI payload:

  • These bytes spell out "github" in ASCII.

Enter the hex command to send (or type 'exit' to quit): FF B0 00 07 10
Card response: 62 2E 63 6F 6D 2F 6C 75 6B 61 73 7A 6E 6F 77 61 Status words: 90 00

• 62 2E 63 6F 6D 2F 6C 75 6B 61 73 7A 6E 6F 77 61

• 62 - b

• 2E - .

• 63 - c

• 6F - o

• 6D - m

• 2F - /

• 6C - l

• 75 - u

• 6B - k

• 61 - a

• 73 - s

• 7A - z

• 6E - n

• 6F - o

• 77 - w

• 61 - a

http://www.github.com/lukasznowa.

Enter the hex command to send (or type 'exit' to quit): FF B0 00 0B 10
Card response: 72 6B 69 65 77 69 63 7A 2F 61 62 6F 75 74 4D 65 Status words: 90 00

• 72 6B 69 65 77 69 63 7A 2F 61 62 6F 75 74 4D 65

• 72 - r

• 6B - k

• 69 - i

• 65 - e

• 77 - w

• 69 - i

• 63 - c

• 7A - z

• 2F - /

• 61 - a

• 62 - b

• 6F - o

• 75 - u

• 74 - t

• 4D - M

• 65 - e

When decoded, these bytes spell out rkiewicz/aboutMe.

• First part: http://www.github.com/lukasznowa
• Second part: b.com/lukasznowa
• Current part: rkiewicz/aboutMe

http://www.github.com/lukasznowarkiewicz/aboutMe

Enter the hex command to send (or type 'exit' to quit): FF B0 00 0C 10
Card response: 77 69 63 7A 2F 61 62 6F 75 74 4D 65 FE 00 00 00 Status words: 90 00

FE - This byte is often used as a terminator in NDEF messages, indicating the end of the NDEF data. The remaining 00 00 00 bytes are typically padding or reserved bytes to fill the rest of the block.

[lukasznowarkiewicz]

https://github.com/lukasznowarkiewicz/NFCBusinessCard/commit/eb21bd26dc22db2556c0c6ff37536d40122a4657

Available readers: ['ACS ACR122U PICC Interface']
Using reader: ACS ACR122U PICC Interface
Enter the hex command to send, type 'read_ndef' to read NDEF data, or type 'exit' to quit: read_ndef
Reading NDEF data...
NDEF Data Read from the Card: *&Ugithub.com/lukasznowarkiewicz/aboutMe

[lukasznowarkiewicz]

NDEF record used till this point: NDEF_data.json

[lukasznowarkiewicz]

Last commit form POC app: https://github.com/lukasznowarkiewicz/NFCBusinessCard/commit/e7f0127be4d335b54e2073499f9afa572542e1d4