Connecting an external NFC reader with Unity

I managed to make a Unity app that reads a tag from a ACR122U card reader.

My solution relies on a third part dll (https://github.com/g-rad/Lando)

I managed to build that dynamic library from Visual Studio. This gives me the Lando.dll file.

Then I imported the file into my Unity project.

 using Lando;

I can use an instance of it

 this.cardReader = new Lando.Cardreader();

It works with delegate methods

 private void CardReader_CardConnected(object sender, CardreaderEventArgs e)
 {
     Debug.Log(e.Card.Id);
 }

…and then

 this.cardReader.CardConnected += CardReader_CardConnected;

Now your reader can respond to reading a card asynchronously, but you still need to turn on and off the reading.

 this.cardReader.StartWatch();
 // you can read your tags now!
 ...
 this.cardReader.StopWatch();
 // read is over…

Don't forget to dispose of your card reader so you can use it later in the application lifetime.

 this.cardReader.Dispose();

The downside of this library is that I can only read the tag identifiers and not their content. I bypassed that limitation by creating different files the app reads at runtime to identify the nature of the IDs.

You may need to change the C# subset from the player settings.