>From android point of view it doesnt matter what the command data is, its
all byte[] to the transcieve.
I try to get a isodep first. if that fails i try to get a NfcB tag.
In my cardB case,
I tried to connect * transcieve using ISODep and get back 6700
If I try to get a NfcB tag, the connect fails with exception.
On Tue, May 3, 2011 at 11:10 PM, Michael Roland wrote:
> Hallo,
>
> which variant did you use, the low-level access or the IsoDep acccess?
>
> The low-level example will only work with MIFARE Ultralight cards (these
> are always NfcA). Sorry, I don't know any example for low-level access
> to NfcB cards. The IsoDep example will certainly only give a useful
> result if the card contains the ICAO electronic passport application...
>
> br
> Michael
>
>
> On 30.04.2011 00:58 priti - wrote:
> > 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 > <mailto:mi.rol...@gmail.com>> 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 A002471001):
> > 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 = A002471001: */
> > (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
> >
> >
> >
>
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