Create an AtClient

onboard.dart

  /// Create an AtClient (AtClientImpl) to communicate with the person's
  /// secondary server
  Future<bool> onboard({String atsign}) async {
    atClientImpl = null;
    atClientService = AtClientService();
    Directory downloadDirectory;

    /// The directory where keys will be stored
    if (Platform.isIOS) {
      downloadDirectory =
      await path_provider.getApplicationDocumentsDirectory();
    }

    /// Download path varies on non-iOS platforms
    else {
      downloadDirectory = await path_provider.getExternalStorageDirectory();
    }

    final appSupportDirectory =
    await path_provider.getApplicationSupportDirectory();

    String path = appSupportDirectory.path;


    /// Setup AtClient preferences (cascade for cleanliness)
    atClientPreference = AtClientPreference()
      ..isLocalStoreRequired = true
      ..commitLogPath = path
      ..syncStrategy = SyncStrategy.IMMEDIATE
      ..rootDomain = AtConstants.ROOT_DOMAIN
      ..hiveStoragePath = path
      ..downloadPath = downloadDirectory.path;

    var result = await atClientService
        .onboard(atClientPreference: atClientPreference, atsign: atsign)
        .catchError((e) => print('Error in Onboarding: $e'));

    print('result: ' + result.toString());
    result ??= false;

    /// Store the current At Sign for display
    atClientImpl = atClientService.atClient;

    return result;
  }