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w3c / web-nfc

Web NFC
https://w3c.github.io/web-nfc/
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Tag with 'NFC-A' and 'ISO-DEP' technologies but not recognized as ndef-compatible #459

Closed Honry closed 4 years ago

Honry commented 4 years ago

I have a tag (see following image read from native nfc app), with 'NFC-A' and 'ISO-DEP' technologies and no NDEF message, which is type of NFC Forum Type 4, per spec https://w3c.github.io/web-nfc/#ndef-compatible-tag-types, my tag should be one of ndef compatible tag types, but which couldn't be read/write from both native nfc app or Chrome, when writing with native nfc app, it throws with "Non-ndef compatible" error.

WeChat Image_20191108154518

leonhsl commented 4 years ago

By my understanding, this tag should just be ndef compatible because of the NfcA technology it carries.

Could anyone help clarify the phenomenon here?

kenchris commented 4 years ago

Is is formatted as ndef?

Honry commented 4 years ago

No, it could not be formatted as ndef.

zolkis commented 4 years ago

AFAIK they MAY also expose NDEF, but not required to do so.

Honry commented 4 years ago

So a tag is of NFC Forum Type 4 may be NDEF compatible, but a tag without NDEF technology (e.g. my tag with only "NFC-A" and "ISO-DEP" technologies) must be NDEF non-compatible, right?

kenchris commented 4 years ago

as far as I understand all NFC tags should support ndef, but I might be wrong - or this might be an issue with the tag. But as this is outside our scope I am closing