Write url NDEF message to tag

[Alex_Polt]

I am trying to write simple url to the tag, but always get "Unknown Service Type" message. What is wrong in the following code:


NDEFRecordType ndefrtype =
new NDEFRecordType(NDEFRecordType.NFC_FORUM_RTD, "urn:nfc:wkt:Sp");

NDEFRecord urlRecordToWrite = new NDEFRecord(ndefrtype , null, "http://www.name.com".getBytes());

NDEFMessage write_container = new NDEFMessage();

write_container.appendRecord(urlRecordToWrite);

[mariosas]

See you http://discussion.forum.nokia.com/fo...nfc%3Awkt%3ASp

in 2007-05-03, 07:10

[Alex_Polt]

I want this link to be opened by phone web browser. So I don't want to create Push Registry autostart entries. But still phone can't recognise this record.

[mariosas]

Connection to TAG open?
TAG is empty (clean)?
write one entry in this TAG and test now.

[Alex_Polt]

Tag contains some data which were written by this code.

I wrote same url from 6131 NFC phone "Send to tag" menu.
There are some differences, tag which were wtitten with my MIDlet contains additional byte, which were not in phone written tag.

I am afraid problem in that. But if so, could Nokia provide example how to write simple url to the tag. Or is anybody did it already.

[mariosas]

? http://wiki.forum.nokia.com/index.ph...ge_to_NDEF_tag
or
?

[jalkanen]

You are using the "urn:nfc:wkt:Sp" type, which means a Smart Poster. A Smart Poster includes an URL, *as well* as an optional image, a title, and some other stuff as well. It's contents are described in the Smart Poster specification, which you can download at http://nfc-forum.org/specs

A plain URL can be written using the "urn:nfc:wkt:U" type, but then you can't add a title or anything else. The exact spec can also be downloaded from NFC Forum, but it's a lot simpler than Smart Poster. Didn't test the following example, but it should work...

...
byte[] headerByte = { 0x00 }; // see URI specification for meanings for this
byte[] urlBytes = "http://my.url".getBytes();

NDEFRecord r = new NDEFRecord( new NDEFRecordType(NFC_FORUM_RTD,"urn:nfc:wkt:U"), null, null );
r.appendPayload(headerByte);
r.appendPayload(urlBytes);

// Write the message
...