The next step was to enumerate The Things Network(TTN) Applications so I could connect only to the required Azure IoT hub(s). There would also be a single configuration setting for the client (establish a connection for every TTN application, or don’t establish a connection for any) and this could be overridden with a TTN application attribute

long pageSize = long.Parse(args[3]);
Console.WriteLine($"Page size: {pageSize}");

Console.WriteLine();

using (HttpClient httpClient = new HttpClient())
{
	ApplicationRegistryClient applicationRegistryClient = new ApplicationRegistryClient(baseUrl, httpClient)
	{
		ApiKey = apiKey
	};

	try
	{
		int page = 1;

		string[] fieldMaskPathsApplication = { "attributes" }; // think this is the bare minimum required for integration

		V3Applications applications = await applicationRegistryClient.ListAsync(collaborator, field_mask_paths: fieldMaskPathsApplication, limit: pageSize, page: page);
		while ((applications != null) && (applications.Applications != null)) 
		{
			Console.WriteLine($"Applications:{applications.Applications.Count} Page:{page} Page size:{pageSize}");
			foreach (V3Application application in applications.Applications)
			{
				bool applicationIntegration = ApplicationAzureintegrationDefault;

				Console.WriteLine($"Application ID:{application.Ids.Application_id}");
				if (application.Attributes != null)
				{
					string ApplicationAzureIntegrationValue = string.Empty;
					if (application.Attributes.TryGetValue(ApplicationAzureIntegrationField, out ApplicationAzureIntegrationValue))
					{
						bool.TryParse(ApplicationAzureIntegrationValue, out applicationIntegration);
					}

					if (applicationIntegration)
					{
						Console.WriteLine("  Application attributes");

						foreach (KeyValuePair<string, string> attribute in application.Attributes)
						{
							Console.WriteLine($"   Key: {attribute.Key} Value: {attribute.Value}");
						}
					}
				}
				Console.WriteLine();
			}
			page += 1;
			applications = await applicationRegistryClient.ListAsync(collaborator, field_mask_paths: fieldMaskPathsApplication, limit: pageSize, page: page);
		};
	}
	catch (Exception ex)
	{
		Console.WriteLine(ex.Message);
	}

	Console.WriteLine("Press <enter> to exit");
	Console.ReadLine();
}

I Used the field_mask_paths parameter (don’t need created_at, updated_at, name etc.) to minimise the data returned to my client.

public async System.Threading.Tasks.Task<V3Applications> ListAsync(string collaborator_organization_ids_organization_id = null, string collaborator_user_ids_user_id = null, string collaborator_user_ids_email = null, System.Collections.Generic.IEnumerable<string> field_mask_paths = null, string order = null, long? limit = null, long? page = null, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken))
{
   var urlBuilder_ = new System.Text.StringBuilder();
   urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd('/') : "").Append("/applications?");
   if (collaborator_organization_ids_organization_id != null) 
   {
         urlBuilder_.Append(System.Uri.EscapeDataString("collaborator.organization_ids.organization_id") + "=").Append(System.Uri.EscapeDataString(ConvertToString(collaborator_organization_ids_organization_id, System.Globalization.CultureInfo.InvariantCulture))).Append("&");
   }
   if (collaborator_user_ids_user_id != null) 
   {
         urlBuilder_.Append(System.Uri.EscapeDataString("collaborator.user_ids.user_id") + "=").Append(System.Uri.EscapeDataString(ConvertToString(collaborator_user_ids_user_id, System.Globalization.CultureInfo.InvariantCulture))).Append("&");
   }
   if (collaborator_user_ids_email != null) 
   {
         urlBuilder_.Append(System.Uri.EscapeDataString("collaborator.user_ids.email") + "=").Append(System.Uri.EscapeDataString(ConvertToString(collaborator_user_ids_email, System.Globalization.CultureInfo.InvariantCulture))).Append("&");
   }
   if (field_mask_paths != null) 
   {
         foreach (var item_ in field_mask_paths) { urlBuilder_.Append(System.Uri.EscapeDataString("field_mask.paths") + "=").Append(System.Uri.EscapeDataString(ConvertToString(item_, System.Globalization.CultureInfo.InvariantCulture))).Append("&"); }
   }
   if (order != null) 
   {
         urlBuilder_.Append(System.Uri.EscapeDataString("order") + "=").Append(System.Uri.EscapeDataString(ConvertToString(order, System.Globalization.CultureInfo.InvariantCulture))).Append("&");
   }
   if (limit != null) 
   {
         urlBuilder_.Append(System.Uri.EscapeDataString("limit") + "=").Append(System.Uri.EscapeDataString(ConvertToString(limit, System.Globalization.CultureInfo.InvariantCulture))).Append("&");
   }
   if (page != null) 
   {
         urlBuilder_.Append(System.Uri.EscapeDataString("page") + "=").Append(System.Uri.EscapeDataString(ConvertToString(page, System.Globalization.CultureInfo.InvariantCulture))).Append("&");
   }
}

I was hoping that there would be a away to further “shape” the returned data, but in the NSwag generated code the construction of the URL with field_mask_paths, order, limit, and page parameters meant this appears not to be possible.