import 'package:nfc_manager/nfc_manager.dart';

NfcManager.instance.isAvailable().then((bool isAvailable) {
    if (isAvailable) {
      // doSomething();
    } else {
      // doSomething();
    }
});

await NfcManager.instance.startSession(
  pollingOptions: {
    NfcPollingOption.iso14443,
    NfcPollingOption.iso15693
  },
  onDiscovered: (NfcTag tag) async {
    final ndef = Ndef.from(tag);
    if (ndef == null) {
      debugPrint('Tag is not compatible with NDEF');
      await NfcManager.instance.stopSession(errorMessage: 'error');
      return;
    } else {
      final message = await ndef.read();
      final tagValue = String.fromCharCodes(message.records.first.payload)
          .substring(3);

      await NfcManager.instance.stopSession();
    }
  },
  onError: (dynamic e) async {
    debugPrint('NFC error: $e');
    await NfcManager.instance.stopSession(errorMessage: 'error');
  },
);