Tag is not NDEF compliant when publishing

[RsZoli]

Description

I'd like to "digitize" a simple printer card, when i read it it really barely has anything on it:

When i try to publish this read data i got the "Tag is not NDEF compliant" exception.
This is my code:

var tag = new TagInfo(_readCard.Identifier)
{
    Records =
    [
        new NFCNdefRecord
        {
            TypeFormat = NFCNdefTypeFormat.Mime,
            MimeType = "application/hu.rszoli.nfctest",
            Payload =_readCard.Identifier
        }
    ]
};

try
{
    CrossNFC.Current.PublishMessage(tag);
}
catch (Exception ex)
{
    await Toast.Make(ex.Message, ToastDuration.Short).Show();
}

What am i missing? I do not care any data but the Identifier read off the card, but i do not mind if its NDEF formatted, i just do not understand how to do this!

Steps to Reproduce

1. Follow above...

Expected Behavior

Publish a tag with a single Identifier and nothing else on it

Actual Behavior

Tag is not NDEF compliant

Basic Information

• Version with issue:
• Last known good version:
• IDE:
• Platform Target Frameworks:
  • iOS:
  • Android:
  • UWP:
• Nuget Packages:
• Affected Devices:

Screenshots

Reproduction Link

[FaithfulDev]

I have little experience with this plugin, so this is just a random guess: Doesn't it say IsWritable = false? I would assume that means it was locked and can't be written to anymore.

[tentom]

In addition to what FaithfulDev said it also says IsSupported = false so I would assume that it is not supported?

[RsZoli]

Thank you for your response! That is the data from the card that i have successfully read! I only need SerialNumber, nothing else, so the rest is irrelevant! I want to present the data to a NFC reader using my phone, instead of the card itself!

[Shaiken]

have you succeeded?
i just want to exchange messages, android to android,
but click write tag button, nothing happened

[FaithfulDev]

@RsZoli Did you verify if the tag you try to write to is actually NDEF compliant, meaning it's NDEF formatted and such?

EDIT: In case someone needs it: There are various apps that allow you to verify such things, I usually use NFC Tools (Android). The card needs to have a data format of NFC Forum Type 2 (or similar; that's NDEF).

[RsZoli]

@Shaiken Sadly, not yet!

[RsZoli]

@FaithfulDev No, because as i have mentioned before, "I want to present the data to a NFC reader using my phone, instead of the card itself!"
So i'm not trying to write any tag!

[FaithfulDev]

Oh, I apologize, I didn't read that correctly before.

What do you use on your phone to emulate being a tag? Something like HCE? I never used HCE before, but I don't think it's meant to be written to by another device. I only know it for emulating a tag to a reader (read-only).

I think for someone to help with your issue, it's important to understand how your phone is emulating being a tag.

[RsZoli]

@FaithfulDev Yes, i'm trying to do HCE exactly! I was under the assumption that writing a tag equals with presenting the same data to a reader, so from the reader's POV it should not matter if it reads the data off a passive tag or the phone, but clearly i have been wrong!