RE: NFC type 4 and Linux (neard) interoperability

Alexey Roslyakov — Tue, 11 Apr 2017 12:26:47 GMT

Hi Michał, it was clearly the problem in the code of neard (plugins/nfctype4.c). The ISO_Select function doesn't work correctly for all cases. I'm preparing a patch for sending to upstream. Thank you very much, I really appreciate your help.

RE: NFC type 4 and Linux (neard) interoperability

Michal — Tue, 11 Apr 2017 07:15:58 GMT

Hi,

looking at your log, the adapter side sends a too short Command APDU: 02 00 a4 04 00 07 d2 76 00 00 85 01 01 The first byte: 02 is an ISO-DEP I-block header, then "Select NDEF Application" APDU is sent: 00 a4 04 00 07 d2 76 00 00 85 01 01 00, but it is missing the highlighted 00 byte at the end. This byte is called Le and it tells how many data bytes shall be sent in a Response APDU, and in case of this command it should be 0 (see Table 10. in NFC Forum Type 4 Tag Operation Specification v2.0).

So please check with the adapter, why it sends a truncated first Command: "Select NDEF Application".