I'm using an ACR122U NFC Reader to communicate with a U-Blox Nina-B1 Series module. The NFC component of these modules uses the ISO14443 NFC standard. I am sending the following APDU Command to read the first 255 bytes of data:
00 B0 00 01 FF
When the module is programmed to be Read/Write I get the following result which I can parse and extract the NDEF messages. And when converting to ascii the data is somewhat readable.
47 89 01 00 00 00 14 03 54 4D 41 43 02 65 6E 38 36 3A 38 37 3A 34 42 3A 32 30 3A 41 43 3A 43 39 09 01 00 00 00 06 03 54 42 41 54 02 65 6E 39 32 25 49 01 00 00 00 0B 04 54 54 45 4D 50 02 65 6E 32 32 2E 31 30 C2 B0 43 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 90 00
However when the module is Read-only the following response can't be parsed, and when converting to ascii it's all mumbo-jumbo:
04 00 20 81 0A 00 00 15 07 00 00 61 0A 00 00 1F 07 00 00 29 07 00 00 33 07 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 A5 0A 00 00 3D 07 00 00 00 00 00 00 47 07 00 00 51 07 00 00 5B 07 00 00 65 07 00 00 6F 07 00 00 79 07 00 00 83 07 00 00 8D 07 00 00 97 07 00 00 A1 07 00 00 AB 07 00 00 B5 07 00 00 BF 07 00 00 C9 07 00 00 D3 07 00 00 DD 07 00 00 E7 07 00 00 F1 07 00 00 FB 07 00 00 05 08 00 00 0F 08 00 00 19 08 00 00 23 08 00 00 2D 08 00 00 37 08 00 00 41 08 00 00 4B 08 00 00 55 08 00 00 5F 08 00 00 69 08 00 00 73 08 00 00 7D 08 00 00 87 08 00 00 91 08 00 00 9B 08 00 00 A5 08 00 00 AF 08 00 00 B9 08 00 00 C3 08 00 00 CD 08 00 00 D7 08 00 00 E1 08 00 00 EB 08 00 00 F5 08 00 00 FF 08 00 00 09 09 00 00 13 09 00 00 1D 09 00 00 27 09 00 00 31 09 00 00 90 00
I don't think this is an authentication issue as the response code (last two bytes) is 0x90 0x00 - meaning success.
Furthermore I'm also able to get the NDEF messages when using an NCF reader on my phone when the tag is read-only.
Is this a known issue with the ACR122U Reader or am I not doing something right?