Hi Michael, Thanks! that worked with my nfcA cards! But when I use it with my nfcB cards, I am getting a "67 00" (protocol error?)
Appreciate your help, Priti On Thu, Apr 28, 2011 at 8:50 AM, Michael Roland <[email protected]> wrote: > Hallo, > > > What exactly is low level access? > > With low-level access (as compared to APDU based access) I mean some > vendor specific (proprietary) protocol according to the ISO/IEC 14443-3 > standard. Thus, instead of sending high-level APDU commands a more > simple protocol is used (such a protocol is for example the MIFARE > Ultralight and the MIFARE Classic command-set). > > > How do I send/receive nfcA/nfcB commands then? > > For NfcA (e.g. MIFARE Ultralight) you would simply retrieve an NfcA object: > > NfcA myTag = NfcA.getTag(tag); > > And then transceive low-level commands with transceive() method. E.g. > > byte[] data = myTag.transceive(new byte[]{ (byte)0x30, (byte)0x00 }); > > would retrieve the first 16 bytes of data from an MIFARE Ultralight tag. > > > But as you suggested you want to transfer APDUs, instead of getting an > NfcA object you would want to get an IsoDep object for the tag. This > object wraps an APDU-based (ISO/IEC 14443-4 & ISO/IEC 7816-4) connection: > > IsoDep myCard = IsoDep.getTag(tag); > > The transceive() method then allows you to directly transmit command > APDUs to the contactless smart card and returns the response APDU: > > byte[] response = myCard.transceive(command); > > Where command could be, for instance, a SELECT(file by DF name) command. > The following command would select the ICAO electronic passport > application (AID A0000002471001): > byte[] command = new byte[]{ > (byte)0x00, /* CLA = 00 (first interindustry command set) */ > (byte)0xA4, /* INS = A4 (SELECT) */ > (byte)0x04, /* P1 = 04 (select file by DF name) */ > (byte)0x0C, /* P2 = 0C (first or only file; no FCI) */ > (byte)0x07, /* Lc = 7 (data/AID has 7 bytes) */ > /* AID = A0000002471001: */ > (byte)0xA0, (byte)0x00, (byte)0x00, (byte)0x02, > (byte)0x47, (byte)0x10, (byte)0x01 > }; > > As a response you would get e.g. status code 9000 if the applet was > found on the card. > > Best regards, > Michael > > > -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
