Native Development

[komanaki]

I saw you just released a complete article about NFC SNEP, this is too fast !

Thanks a lot.

[mwoolley]

we aim to please :-)

And there will be more!

[komanaki]

Cool

But i noticed that the "Read mode" in NFC Tool can't detect the SNEP mode :/

[mwoolley]

Let me check I understand what you mean; are you trying to use the NFC Tool "Read tag" function to receive an NDEF message sent over SNEP?

If so, be aware that the Read function registers as a listener for types T, U and Sp only so unless your SNEP responder serves an NDEF message of one of those types, the NFC Tool will not respond. I just tested, sending a type T (text) message from a 9900 and it worked fine.

[komanaki]

Okay, so i have to tweak the code of the SNEP part in order to send a T, U or Sp message ?

[mwoolley]

Yes, a class like the following may help:

public class SnepMsgBuilder implements NDEFMessageBuilder {
    
    private String the_text="";
    
    public SnepMsgBuilder(String text) {
        the_text = text;        
    }

    public NDEFMessage[] buildNDEFMessages() {
        NDEFMessage[] ndefMessages = null;
        NDEFMessage textNdefMessage;
        try {
            textNdefMessage = NDEFMessageUtils.createTextNDEFMessage(the_text, "en-US");
            ndefMessages = new NDEFMessage[] { textNdefMessage };
            return ndefMessages;
        } catch(NFCException e) {
            return new NDEFMessage [0];
        }
    }

}

[komanaki]

I duplicated the "Send vCard (SNEP)" part and tweaked it in order to send a Text record instead of a Media record,

But the other Dev Aplha in "Read" mode don't detect anything...

[mwoolley]

OK, I see what you're doing now. The read function in Nfc Tool will not receive SNEP messages sent by the same device. You need two devices to play with peer to peer. You can't be both sender and receiver of the same data in the same device.

So I used a BlackBerry Bold 9900 as the other device. The Java I pasted was from an app I wrote for BB7 which served an NDEF T messages via SNEP. This was received by the Read function running on the Dev Alpha.

Hope that makes sense and you have access to another device which supports NFC peer to peer mode.

[komanaki]

I got it, that's why i'm testing that with two Dev Alpha, but the logs says that there's absolutely no BPS events for both sender device and receiver device :/

[mwoolley]

Ah OK, thanks for clarifying. You have *two* Dev Alphas?! Who do you work for?

I'll do some investigation now I understand this.

Cheers