Google Cloud IoT Coreに登録されている端末の一覧を取得するプログラム

Program.cs

using Google.Apis.Auth.OAuth2;
using Google.Apis.CloudIot.v1;
using Google.Apis.Services;
using System;
using System.Threading.Tasks;

namespace Sample
{
    class Program
    {
        private static readonly string ProjectId = "[PROJECT_ID]";

        private static readonly string Region = "[REGION_NAME]";

        private static readonly string RegistryId = "[REGISTRY_ID]";

        static void Main(string[] args)
        {
            Run().Wait();
        }

        static async Task Run()
        {
            // 環境変数"GOOGLE_APPLICATION_CREDENTIALS"が必要。
            // 参照: https://cloud.google.com/docs/authentication/getting-started
            var credential = GoogleCredential.GetApplicationDefault();
            if (credential.IsCreateScopedRequired)
            {
                credential = credential.CreateScoped(new[]
                {
                    CloudIotService.Scope.CloudPlatform
                });
            }

            var cloudIotService = new CloudIotService(new BaseClientService.Initializer
            {
                HttpClientInitializer = credential,
                GZipEnabled = false
            });

            var parent = $"projects/{ProjectId}/locations/{Region}/registries/{RegistryId}";
            var getDeviceListResponse = await cloudIotService.Projects.Locations.Registries.Devices.List(parent).ExecuteAsync();

            foreach (var device in getDeviceListResponse.Devices)
            {
                var name = $"{parent}/devices/{device.Id}";
                var getDeviceReponse = await cloudIotService.Projects.Locations.Registries.Devices.Get(name).ExecuteAsync();

                Console.WriteLine($"ID: {getDeviceReponse.Id}, Name: {getDeviceReponse.Metadata["Name"]}");
            }
        }
    }
}