I am working on an application that should be able to emulate a copy of any type of NFC tag. After reading the data from the zero blocks and pages of labels like "NFC type A" and "MIFARE Ultralight" (there are no tags of other types at my disposal yet) using the methods:

nfcA.transceive()

and

 mifareUltralight.readPages()

The remaining data is not read, and the exception "Transceive failed" is thrown.

Below is the code of the relevant methods. For NfcA:

 private static ArrayList<IdNameValue> readeNfcADataset(final Tag tag, final Context cxt) { String excMsg = ""; ArrayList<IdNameValue> dataSet = new ArrayList<>(); NfcA nfcA = NfcA.get(tag); if (nfcA != null) { dataSet.add(new IdNameValue(cxt.getString(R.string.atqa) + " ", "0x" + byteArrayToHexString(nfcA.getAtqa()))); dataSet.add(new IdNameValue(cxt.getString(R.string.sak) + " ", "0x" + shortToHexString(nfcA.getSak()))); byte blockNumber = 0x00; int bytesNumber = 1, pagesNumber = 16, counter = 0; byte[][] bytes = new byte[pagesNumber][bytesNumber]; excMsg = "_________________________________________________\n" + cxt.getString(R.string.picc_compliant_with_iso_iec_14443_3A_fnca) + ":"; Log.i(TAG, excMsg); for (int i = 0; i < pagesNumber; i++) { excMsg = ""; while (!nfcA.isConnected()) { try { nfcA.connect(); excMsg = cxt.getString(R.string.connecting_to_tag_has_been_created); Log.i(TAG, 109 + ": " + excMsg); bytes[i] = nfcA.transceive(new byte[]{ (byte) 0x30, // READ (byte) (blockNumber & 0x0FF) }); excMsg = cxt.getString(R.string.made_to_read_data_from_a_block) + Integer.toHexString(blockNumber); Log.i(TAG, 117 + ": " + excMsg); if (nfcA.isConnected()) nfcA.close(); excMsg += cxt.getString(R.string.tag_has_been_closed); break; } catch (IOException e) { counter++; excMsg = e.getMessage() + ":> " + (excMsg.equals("") ? cxt.getString(R.string.the_connection_tag_is_not_created) : (excMsg.contains(cxt.getString(R.string.connecting_to_tag_has_been_created)) || excMsg.contains(cxt.getString(R.string.made_to_read_data_from_a_page))) ? "Failed to read data from a tag block: " + Integer.toHexString(blockNumber) : cxt.getString(R.string.error_closing_tag)); Log.e(TAG, 130 + ": " + excMsg); } if (nfcA.isConnected()) try { nfcA.close(); } catch (IOException e1) { excMsg += (":> " + e1.getMessage()); Log.e(TAG, 137 + ": " + excMsg); } if (counter > 9) { excMsg = cxt.getString(R.string.the_number_of_connection_attempts_exceeded_the_number_of_ten); Log.e(TAG, 143 + ": " + excMsg); break; } } counter = 0; blockNumber += (byte) bytes[i].length; } if (excMsg.equals(cxt.getString(R.string.the_number_of_connection_attempts_has_exceeded_one_hundred))) { dataSet.add(new IdNameValue("Error", " reading the data tag")); return dataSet; } dataSet.add(new IdNameValue("Page", " 0 1 2 3")); String name = ""; String value = ""; for (int i = 0; i < pagesNumber; i++) { if (!value.equals("")) dataSet.add(new IdNameValue(name, value)); name = (i > 9 ? " " : " ") + String.valueOf(i) + " "; value = ""; for (int j = 0; j < bytes[i].length; j++) { value += (" " + byteToHexString(bytes[i][j])); } } dataSet.add(new IdNameValue(name, value)); return dataSet; } return dataSet; }

For MifareUltraligh:

 private static ArrayList<IdNameValue> readeMifareUltralightDataset(final Tag tag, final Context cxt) { MifareUltralight mifareUltralight = MifareUltralight.get(tag); String excMsg = ""; int bytesNumber = 1, pagesNumber = 4, counter = 0, startBlock; byte[][] bytes = new byte[pagesNumber][bytesNumber]; startBlock = 0x00; excMsg = "_________________________________________________\n" + cxt.getString(R.string.mifare_ultralight_or_ultralight_c) + ":"; Log.i(TAG, excMsg); for (int i = 0; i < pagesNumber; i++) { while (!mifareUltralight.isConnected()) { excMsg = ""; try { mifareUltralight.connect(); excMsg = cxt.getString(R.string.connecting_to_tag_has_been_created); Log.i(TAG, 201 + ": " + excMsg); bytes[i] = mifareUltralight.readPages(startBlock); excMsg = cxt.getString(R.string.done_reading_pages_twice_blocks) + Integer.toHexString(startBlock) + " - " + Integer.toHexString((startBlock + bytes[i].length) - 1); Log.i(TAG, 207 + ": " + excMsg); if (mifareUltralight.isConnected()) mifareUltralight.close(); excMsg = cxt.getString(R.string.tag_has_been_closed); Log.i(TAG, 210 + ": " + excMsg); break; } catch (IOException e) { counter++; excMsg = e.getMessage() + ":> " + (excMsg.equals("") ? cxt.getString(R.string.the_connection_tag_is_not_created) : (excMsg.contains(cxt.getString(R.string.connecting_to_tag_has_been_created)) || excMsg.contains(cxt.getString(R.string.done_reading_pages_twice_blocks)) ? "Failed to read page from tag blocks: " + Integer.toHexString(startBlock) + " - " + Integer.toHexString(startBlock + bytes[i].length - 1) : cxt.getString(R.string.error_closing_tag))); Log.e(TAG, 222 + ": " + excMsg); } if (mifareUltralight.isConnected()) try { mifareUltralight.close(); break; } catch (IOException e) { excMsg = (":> " + e.getMessage()); Log.e(TAG, 230 + ": " + excMsg); } if (counter > 9) { excMsg = cxt.getString(R.string.the_number_of_connection_attempts_exceeded_the_number_of_ten); Log.e(TAG, 236 + ": " + excMsg); break; } } counter = 0; startBlock += bytes[i].length; } ArrayList<IdNameValue> dataSet = new ArrayList<>(); if (excMsg.equals(cxt.getString(R.string.the_number_of_connection_attempts_has_exceeded_one_hundred))) { dataSet.add(new IdNameValue("Error", " reading the data tag")); return dataSet; } dataSet.add(new IdNameValue("Page", " 0 1 2 3")); int n = -1; String name = ""; String value = ""; for (int i = 0; i < pagesNumber; i++) { for (int j = 0; j < bytes[i].length; j++) { if (j % 4 == 0) { n++; if (!value.equals("")) dataSet.add(new IdNameValue(name, value)); name = (n > 9 ? " " : " ") + String.valueOf(n) + " "; value = ""; } value += (" " + byteToHexString(bytes[i][j])); } } dataSet.add(new IdNameValue(name, value)); return dataSet; }

These are fragments of the log received:

 ...cardreader I/TagController: _________________________________________________ PICC compliant with ISO/IEC 14443-3A (NFCA): ...cardreader I/TagController: 109: The connecting to tag has been created ...cardreader I/TagController: 117: Made to read data from a block: 0 ...cardreader I/TagController: 109: The connecting to tag has been created ...cardreader E/TagController: 130: Transceive failed:> Failed to read data from a tag block: 10 ...cardreader I/TagController: 109: The connecting to tag has been created ...cardreader E/TagController: 130: Transceive failed:> Failed to read data from a tag block: 10 ........................................................... ...cardreader I/TagController: 109: The connecting to tag has been created ...cardreader E/TagController: 130: Transceive failed:> Failed to read data from a tag block: 1e ...cardreader E/TagController: 143: The number of connection attempts exceeded the number of ten. ...cardreader I/TagController: _________________________________________________ MIFARE Ultralight or Ultralight C: ...cardreader I/TagController: 201: The connecting to tag has been created ...cardreader I/TagController: 207: Done reading pages twice blocks:0 - f ...cardreader I/TagController: 210: Tag has been closed ...cardreader I/TagController: 201: The connecting to tag has been created ...cardreader E/TagController: 222: Transceive failed:> Failed to read page from tag blocks: 10 - 10 ...cardreader I/TagController: 201: The connecting to tag has been created ...cardreader E/TagController: 222: Transceive failed:> Failed to read page from tag blocks: 11 - 11 ...cardreader I/TagController: 201: The connecting to tag has been created ...cardreader E/TagController: 222: Transceive failed:> Failed to read page from tag blocks: 12 - 12

The fact that the data in the remaining blocks are available demonstrates the output to the monitor port of the Arduino 1.8.5 program:

 Card UID: 04 3A 31 02 54 2E 82 Card SAK: 00 PICC type: MIFARE Ultralight or Ultralight C Page 0 1 2 3 0 04 3A 31 87 1 02 54 2E 82 2 FA 48 F0 00 3 FF FF FF FC 4 45 D9 B0 49 5 9E 6A 2D 00 6 1E 82 00 00 7 1E 82 00 00 8 1E 7E 05 00 9 40 00 08 09 10 B7 DD DB FF 11 1E 7E 98 48 12 1E 7E 05 00 13 40 00 08 09 14 B7 DD DB FF 15 1E 7E 98 48

The application screenshot below demonstrates that the label allows you to read data about its type, technologies and UID:

The output read from the label data on its type, technology and UID

The following shows the output read from the label of the first 16 bytes of data. For NFC type A technology:

Output read from data label (NFC type A)

For MIFARE Ultralight technology:

The output read from the data label (technology MIFARE Ultralight)

As you can see, ONLY the FIRST 16 bytes are read. What can be wrong?

    1 answer 1

    Long study of documentation, namely "MF0ICU1 MIFARE Ultralight contactless single-ticket IC" / Rev. 3.9 - July 23, 2014 # 028639 and "MF0ICU2 MIFARE Ultralight C" / Rev. 3.2 - 19 May 2009 # 171432 resulted, after all, in understanding the problem: the whole point in block addressing, which is fed to the READE command input. The calculation of the block number for an NFCA type label should look like this:

     blockNumber = (byte) (i * 4);

    and for a label like Mifare Ultralight - like this:

     startBlock = i * 4;

    After that, everything takes off.