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Thank you very much! Something's clearly up there. You can see that even IOS and Android disagree with each other on what NDEF should look like by a few bytes.

Thank you very much! Something's clearly up there. You can see that even IOS and Android disagree with each other on what NDEF should look like by a few bytes. Very interesting.

stavros 2y ago
Yep, 89 EC A9 7F 8C 2A 00 00 on iOS versus FF FF FF FF FF FF on Android. Interesting how the number of bytes is different, I should play with them a bit.
- ewpratten 2y ago
  There's lots of info about the NDEF "packet" format online. I used this page as reference when I was putting together the "magic bytes" in the final section of the blog post: https://www.oreilly.com/library/view/beginning-nfc/9781449324094/ch04.html https://www.oreilly.com/library/view/beginning-nfc/978144932...
  - stavros 2y ago
    This is fantastic, thanks! Also, one thing that might be of interest: Even after a wipe and an ndefformat, my Android-written tag can be read by my iPhone 15. NFC tools will only read it in compatibility mode, though.
    - ewpratten 2y ago
      Are you sure? The NFC app for iPhone can always read tags. Its specifically getting phones without the app to read them. Try wiping, then writing a URL from Android. Then just tap to the iPhone and see if Safari opens or not. It shouldn't
      - stavros 2y ago
        Yes: https://imgz.org/i9ZqL6Ax.png https://imgz.org/i9ZqL6Ax.png I don't know if it's Vivaldi doing that, but I can't imagine they would have added NFC tag reading capability to the browser specifically. Feel free to email me if you want, btw, as this thread is getting a bit too deep.
      - fragmede 2y ago
        If a URL is written using NFCTools on iPhone, iOS will open it in the default browser without using NFCTools, or in the related app (eg Instagram) if there is one.
        MichaelBosworth 2y ago
        I find this only to be true when used on the same iPhone where NFCTools was used. If you try to have another iPhone detect the badge, it appears not to work - unless you use NFCTools on that iPhone, too. I don't have conclusive proof but that's what the evidence seems to indicate. Are you seeing something different?

Thank you very much! Something's clearly up there. You can see that even IOS and Android disagree with each other on what NDEF should look like by a few bytes. Very interesting.

stavros 2y ago

Yep, 89 EC A9 7F 8C 2A 00 00 on iOS versus FF FF FF FF FF FF on Android. Interesting how the number of bytes is different, I should play with them a bit.

ewpratten 2y ago
There's lots of info about the NDEF "packet" format online. I used this page as reference when I was putting together the "magic bytes" in the final section of the blog post: https://www.oreilly.com/library/view/beginning-nfc/9781449324094/ch04.html https://www.oreilly.com/library/view/beginning-nfc/978144932...
- stavros 2y ago
  This is fantastic, thanks! Also, one thing that might be of interest: Even after a wipe and an ndefformat, my Android-written tag can be read by my iPhone 15. NFC tools will only read it in compatibility mode, though.
  - ewpratten 2y ago
    Are you sure? The NFC app for iPhone can always read tags. Its specifically getting phones without the app to read them. Try wiping, then writing a URL from Android. Then just tap to the iPhone and see if Safari opens or not. It shouldn't
    - stavros 2y ago
      Yes: https://imgz.org/i9ZqL6Ax.png https://imgz.org/i9ZqL6Ax.png I don't know if it's Vivaldi doing that, but I can't imagine they would have added NFC tag reading capability to the browser specifically. Feel free to email me if you want, btw, as this thread is getting a bit too deep.
    - fragmede 2y ago
      If a URL is written using NFCTools on iPhone, iOS will open it in the default browser without using NFCTools, or in the related app (eg Instagram) if there is one.
      - MichaelBosworth 2y ago
        I find this only to be true when used on the same iPhone where NFCTools was used. If you try to have another iPhone detect the badge, it appears not to work - unless you use NFCTools on that iPhone, too. I don't have conclusive proof but that's what the evidence seems to indicate. Are you seeing something different?