Experiments with libndef

ndef_experiment.cpp

// More complicated SP
NDEFRecord text = NDEFRecord::createTextRecord("Could be an ID here...", "en-US");

// USING THIS ACTION RECORD RESULTED IN TRUNCATED truncated OUTPUT
//  NDEFRecord action = NDEFRecord::createSpActionRecord(NDEFRecord::Do); // should have value of zero
NDEFRecord type = NDEFRecord::createSpTypeRecord("application/json"); // not necessary

QList<NDEFRecord> records;
records.append(text);
//  records.append(action);
records.append(type);
NDEFRecord sp = NDEFRecord::createSmartPosterRecord("http://www.th.com/mobile_welcome", records);

msg.appendRecord(sp);
// Now let's shove it in a TLV for the tag
Tlv tlv = Tlv::createNDEFMessageTlv(msg);

const char *data = output.constData();
while (*data) {
  printf ("%x = %u = %c", *data, *data, *data);
  cout << endl;
  ++data;
}

ndef_output

3               = 3               =           = TLV BLOCK - byte1 - 3 means it contains an NDEF message
53              = 83              = S         = TLV BLOCK - byte2 - Length Field - single byte format = value field is 83 bytes long
ffffffd1        = 4294967249      =           = ???? IS THIS THE MB/ME/CF/SR/IL/TNT ????, Yes NDEF HEADER
1111 1111 1111 1111 1111 1111 1101 0001  - last octet could be it...  why all the padding in front?
MB=1
ME=1
CF=0
SR=1
IL=0
TNT=0x01 = NFC Forum well-known type

2               = 2               =           = TYPE LENGTH = 2 bytes
4e              = 78              = N         = PAYLOAD LENGTH = 78 bytes
53              = 83              = S         = TYPE Byte 1. i.e. S of "Sp"
70              = 112             = p         = TYPE Byte 2. i.e. p of "Sp"
ffffff91        = 4294967185      =           = ???? IS THIS THE MB/ME/CF/SR/IL/TNT ????, Yes NDEF HEADER
111111111111111111111111 1001 0001
MB=1
ME=0
CF=0
SR=1
IL=0
TNT=0x01 = NFC Forum well-known type

1               = 1               =           = TYPE LENGTH = 1 byte
1c              = 28              =           = PAYLOAD LENGTH = 26 bytes
54              = 84              = T         = TYPE = T = Text
5               = 5               =           = STATUS BYTE = 5 = Length of language code in bytes
65              = 101             = e         = Language code Byte 1
6e              = 110             = n         = Language code Byte 2
2d              = 45              = -         = Language code Byte 3
55              = 85              = U         = Language code Byte 4
53              = 83              = S         = Language code Byte 5
43              = 67              = C         = Data
6f              = 111             = o         = Data
75              = 117             = u         = Data
6c              = 108             = l         = Data
64              = 100             = d         = Data
20              = 32              =           = Data
62              = 98              = b         = Data
65              = 101             = e         = Data
20              = 32              =           = Data
61              = 97              = a         = Data
6e              = 110             = n         = Data
20              = 32              =           = Data
49              = 73              = I         = Data
44              = 68              = D         = Data
20              = 32              =           = Data
68              = 104             = h         = Data
65              = 101             = e         = Data
72              = 114             = r         = Data
65              = 101             = e         = Data
2e              = 46              = .         = Data
2e              = 46              = .         = Data
2e              = 46              = .         = Data
11              = 17              =           = ???????????? 
1               = 1               =           = Type Length = 1 byte
10              = 16              =           = PAYLOAD LENGTH = 16 bytes
74              = 116             = t         = TYPE = t = "Type Record" (describes MIME Types)
61              = 97              = a         = Data
70              = 112             = p         = Data
70              = 112             = p         = Data
6c              = 108             = l         = Data
69              = 105             = i         = Data
63              = 99              = c         = Data
61              = 97              = a         = Data
74              = 116             = t         = Data
69              = 105             = i         = Data
6f              = 111             = o         = Data
6e              = 110             = n         = Data
2f              = 47              = /         = Data
6a              = 106             = j         = Data
73              = 115             = s         = Data
6f              = 111             = o         = Data
6e              = 110             = n         = Data
51              = 81              = Q         = ???????????? 
1               = 1               =           = Type Length = 1 byte
16              = 22              =           = PAYLOAD LENGTH = 16 bytes
55              = 85              = U         = TYPE = U = URI
1               = 1               =           = SHORT FORM - 01 = http://www.
74              = 116             = t         = Data
68              = 104             = h         = Data
2e              = 46              = .         = Data
63              = 99              = c         = Data
6f              = 111             = o         = Data
6d              = 109             = m         = Data
2f              = 47              = /         = Data
6d              = 109             = m         = Data
6f              = 111             = o         = Data
62              = 98              = b         = Data
69              = 105             = i         = Data
6c              = 108             = l         = Data
65              = 101             = e         = Data
5f              = 95              = _         = Data
77              = 119             = w         = Data
65              = 101             = e         = Data
6c              = 108             = l         = Data
63              = 99              = c         = Data
6f              = 111             = o         = Data
6d              = 109             = m         = Data
65              = 101             = e         = Data

Issues experienced were due to the way I was printing out the lines.... whoops!
Here's a better way:

    for (int i = 0; i < output.count(); i++)
    {
        const char c = output.at(i);
        out << QByteArray(&c, 1).toHex();
        out << " = "  << ((unsigned char)c);
        // out << " = " << c;
        out << "\n";
    }