Android NFC transceive() using NFCF tech (Sony Felica)

Question

I am attempting to connect my Android tablet to a device using NFC and retrieve data from the device. What I've Tried Sending commands as it explains in the nfc_device_detection_1.01.pdf (Chapter 4) The android java doc for transceive() mentions the "Applications must not append the SoD (length) or EoD (CRC) to the payload, it will be automatically calculated" I have therefore tried with and without the CRC, with and without the packet data length but the documentation is not clear on if I should leave it blank or if i should just not include it. Another approach I have taken is following the diagram in chapter 2.2 of format_sequence_guidelines_1.1.pdf (Sync Code followed by Request) but same results. The problem I do not know what command (bytes) to send as an argument into the transceive() method.** Questions Does anyone: - have an example of NFCF communication? - have more information on the protocol/command that should be used? - know if the NFC Tag contain the bytes I need for th…

Accepted Answer

Here is an example function of how to send a "raw" command, given the target device (tag) IDm, the FeliCa command byte and the payload:

```
byte[] rawCmd(NfcF nfcF, byte[] IDm, byte felicaCmd, byte[] payload) throws IOException {
    final int len = payload != null ? payload.length : 0;

final byte[] cmd = new byte[10 + len];
    cmd[0] = (byte) (10 + len);
    cmd[1] = felicaCmd;
    System.arraycopy(IDm, 0, cmd, 2, IDm.length);

if (payload != null) {
        System.arraycopy(payload, 0, cmd, 10, payload.length);
    }

nfcF.transceive(cmd);
}
```

Android NFC transceive() using NFCF tech (Sony Felica)

Solution

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