public int readNfcV(Tag tag) throws Exception {
if (tag == null) {
callbackContext.error("NULL");
}
byte[] response = new byte[4];
NfcV nfcv = NfcV.get(tag);
if (nfcv != null) {
try {
nfcv.connect();
byte[] request =
new byte[] {
(byte) 0x00, // flag
(byte) 0x20, // command: READ ONE BLOCK
(byte) block // IMMER im gleichen Block
};
response = nfcv.transceive(request);
} catch (IOException e) {
callbackContext.error(nfcv.toString());
} finally {
try {
nfcv.close();
} catch (IOException e) {
}
}
}
// 1. Byte: Block locking status
byte[] value = new byte[] {response[1], response[2], response[3], response[4]};
return ByteBuffer.wrap(value).order(java.nio.ByteOrder.BIG_ENDIAN).getInt();
}
