import 'package:nfc_manager/nfc_manager.dart';
// Check the availability of NFC on the current device.
NfcAvailability availability = await NfcManager.instance.checkAvailability();
if (availability != NfcAvailability.enabled) {
  print('NFC may not be supported or may be temporarily disabled.');
  return;
}
// Start the session.
NfcManager.instance.startSession(
  pollingOptions: {NfcPollingOption.iso14443}, // You can also specify iso18092 and iso15693.
  onDiscovered: (NfcTag tag) async {
    // Do something with an NfcTag instance...
    print(tag);
    // Stop the session when no longer needed.
    await NfcManager.instance.stopSession();
  },
);

import 'package:nfc_manager/nfc_manager.dart';
import 'package:nfc_manager_ndef/nfc_manager_ndef.dart';
final Ndef ndef = Ndef.from(tag);
if (ndef == null) {
  print('This tag is not compatible with NDEF.');
  return;
}
// Do something with an Ndef instance...
print(ndef);