Flutter Dart NFC Wifi Record Type

wifi_ndef_record.dart

import 'dart:typed_data';
import 'package:ndef/ndef.dart' as ndef;

class WifiNdefRecord {
  static ndef.NDEFRecord createWifiRecord(String ssid, String password) {
    Uint8List ssidByte = Uint8List.fromList(ssid.codeUnits);
    Uint8List passwordByte = Uint8List.fromList(password.codeUnits);
    Uint8List ssidLength = Uint8List.fromList([(ssid.length >> 8) & 0xFF, ssid.length & 0xFF]);
    Uint8List passwordLength = Uint8List.fromList([(password.length >> 8) & 0xFF, password.length & 0xFF]);

    Uint8List credential = Uint8List.fromList([0x10, 0x0E]); // CREDENTIAL
    Uint8List networkName = Uint8List.fromList([0x10, 0x45]); // NETWORK_NAME
    Uint8List networkKey = Uint8List.fromList([0x10, 0x27]); // NETWORK_KEY

    int totalLen = ssidByte.length + passwordByte.length + 4;
    Uint8List totalLenBytes = Uint8List.fromList([(totalLen >> 8) & 0xFF, totalLen & 0xFF]);

    Uint8List payload = _concat([
      credential,
      totalLenBytes,
      networkName,
      ssidLength,
      ssidByte,
      networkKey,
      passwordLength,
      passwordByte,
    ]);

    Uint8List type = Uint8List.fromList('application/vnd.wfa.wsc'.codeUnits);

    return ndef.NDEFRecord(
      tnf: ndef.TypeNameFormat.media,
      type: type,
      payload: payload,
    );
  }

  static Uint8List _concat(List<Uint8List> byteLists) {
    return Uint8List.fromList(byteLists.expand((x) => x).toList());
  }
}