Need extension to read serial number of NFC tag

[Marco_Perrone]

My update

NFC and App Inventor What I understood and what I would like to do

Hi everybody, I write this post because I hope to help people that like me use NFC, and find somebody that can help to solve some problems that I found. Two months ago I started to work with NFC and the great App Inventor, unfortunately I saw that it wasn't possible to do a lot of things, so I decided, for the first time, to create my own extension and I started with Mifare Classic RFID Technology because I know something about it .NFC and Mifare UID Extension After that some people asked me…