Registry management samples

The samples on this page show you how to programmatically manage device registries using the Cloud IoT Core API.

For Node.js and Python, first instantiate your client library.

Node.js

const {google} = require('googleapis');
const iot = require('@google-cloud/iot');

const API_VERSION = 'v1';
const DISCOVERY_API = 'https://cloudiot.googleapis.com/$discovery/rest';

const client = new iot.v1.DeviceManagerClient();
// Returns an authorized API client by discovering the Cloud IoT Core API with
// the provided API key.
const getClient = async serviceAccountJson => {
  // the getClient method looks for the GCLOUD_PROJECT and GOOGLE_APPLICATION_CREDENTIALS
  // environment variables if serviceAccountJson is not passed in
  const authClient = await google.auth.getClient({
    keyFilename: serviceAccountJson,
    scopes: ['https://www.googleapis.com/auth/cloud-platform'],
  });

  const discoveryUrl = `${DISCOVERY_API}?version=${API_VERSION}`;

  google.options({
    auth: authClient,
  });

  try {
    return google.discoverAPI(discoveryUrl);
  } catch (err) {
    console.log('Error during API discovery.', err);
  }
};

Python

def get_client(service_account_json):
    """Returns an authorized API client by discovering the IoT API and creating
    a service object using the service account credentials JSON."""
    api_scopes = ['https://www.googleapis.com/auth/cloud-platform']
    api_version = 'v1'
    discovery_api = 'https://cloudiot.googleapis.com/$discovery/rest'
    service_name = 'cloudiotcore'

    credentials = service_account.Credentials.from_service_account_file(
            service_account_json)
    scoped_credentials = credentials.with_scopes(api_scopes)

    discovery_url = '{}?version={}'.format(
            discovery_api, api_version)

    return discovery.build(
            service_name,
            api_version,
            discoveryServiceUrl=discovery_url,
            credentials=scoped_credentials)

Create a registry

The following sample shows you how to create a registry that you can then add devices to:

C#

public static object CreateRegistry(string projectId, string cloudRegion, string registryId, string pubsubTopic)
{
    var cloudIot = CreateAuthorizedClient();
    // The resource name of the location associated with the key rings.
    var parent = $"projects/{projectId}/locations/{cloudRegion}";

    Console.WriteLine(parent);

    try
    {
        Console.WriteLine($"Creating {registryId}");


        DeviceRegistry body = new DeviceRegistry()
        {
            Id = registryId,
        };
        body.EventNotificationConfigs = new List<EventNotificationConfig>();
        var toAdd = new EventNotificationConfig()
        {
            PubsubTopicName = pubsubTopic.StartsWith("projects/") ?
                pubsubTopic : $"projects/{projectId}/topics/{pubsubTopic}",
        };
        body.EventNotificationConfigs.Add(toAdd);
        var registry = cloudIot.Projects.Locations.Registries.Create(body, parent).Execute();
        Console.WriteLine("Registry: ");
        Console.WriteLine($"{registry.Id}");
        Console.WriteLine($"\tName: {registry.Name}");
        Console.WriteLine($"\tHTTP Enabled: {registry.HttpConfig.HttpEnabledState}");
        Console.WriteLine($"\tMQTT Enabled: {registry.MqttConfig.MqttEnabledState}");
    }
    catch (Google.GoogleApiException e)
    {
        Console.WriteLine(e.Message);
        if (e.Error != null) return e.Error.Code;
        return -1;
    }
    return 0;
}

Go


// createRegistry creates a IoT Core device registry associated with a PubSub topic
func createRegistry(w io.Writer, projectID string, region string, registryID string, topicName string) (*cloudiot.DeviceRegistry, error) {
	client, err := getClient()
	if err != nil {
		return nil, err
	}

	registry := cloudiot.DeviceRegistry{
		Id: registryID,
		EventNotificationConfigs: []*cloudiot.EventNotificationConfig{
			{
				PubsubTopicName: topicName,
			},
		},
	}

	parent := fmt.Sprintf("projects/%s/locations/%s", projectID, region)
	response, err := client.Projects.Locations.Registries.Create(parent, &registry).Do()
	if err != nil {
		return nil, err
	}

	fmt.Fprintln(w, "Created registry:")
	fmt.Fprintf(w, "\tID: %s\n", response.Id)
	fmt.Fprintf(w, "\tHTTP: %s\n", response.HttpConfig.HttpEnabledState)
	fmt.Fprintf(w, "\tMQTT: %s\n", response.MqttConfig.MqttEnabledState)
	fmt.Fprintf(w, "\tName: %s\n", response.Name)

	return response, nil
}

Java

/** Create a registry for Cloud IoT. */
public static void createRegistry(
    String cloudRegion, String projectId, String registryName, String pubsubTopicPath)
    throws GeneralSecurityException, IOException {
  GoogleCredential credential =
      GoogleCredential.getApplicationDefault().createScoped(CloudIotScopes.all());
  JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
  HttpRequestInitializer init = new RetryHttpInitializerWrapper(credential);
  final CloudIot service =
      new CloudIot.Builder(GoogleNetHttpTransport.newTrustedTransport(), jsonFactory, init)
          .setApplicationName(APP_NAME)
          .build();

  final String projectPath = "projects/" + projectId + "/locations/" + cloudRegion;
  final String fullPubsubPath = "projects/" + projectId + "/topics/" + pubsubTopicPath;

  DeviceRegistry registry = new DeviceRegistry();
  EventNotificationConfig notificationConfig = new EventNotificationConfig();
  notificationConfig.setPubsubTopicName(fullPubsubPath);
  List<EventNotificationConfig> notificationConfigs = new ArrayList<EventNotificationConfig>();
  notificationConfigs.add(notificationConfig);
  registry.setEventNotificationConfigs(notificationConfigs);
  registry.setId(registryName);

  DeviceRegistry reg =
      service.projects().locations().registries().create(projectPath, registry).execute();
  System.out.println("Created registry: " + reg.getName());
}

Node.js

// Client retrieved in callback
// getClient(serviceAccountJson, function(client) {...});
// const cloudRegion = 'us-central1';
// const projectId = 'adjective-noun-123';
// const registryId = 'my-registry';
// function errCb = lookupRegistry; // Lookup registry if already exists.
const parentName = `projects/${projectId}/locations/${cloudRegion}`;
const pubsubTopic = `projects/${projectId}/topics/${pubsubTopicId}`;

const request = {
  parent: parentName,
  resource: {
    eventNotificationConfigs: [
      {
        pubsubTopicName: pubsubTopic,
      },
    ],
    id: registryId,
  },
};

try {
  const {data} = await client.projects.locations.registries.create(request);

  console.log('Successfully created registry');
  console.log(data);
} catch (err) {
  console.log('Could not create registry');
  console.log(err);
}

PHP

use Google\Cloud\Iot\V1\DeviceManagerClient;
use Google\Cloud\Iot\V1\DeviceRegistry;
use Google\Cloud\Iot\V1\EventNotificationConfig;

/**
 * Creates a registry if it doesn't exist and prints the result.
 *
 * @param string $registryId IOT Device Registry ID
 * @param string $pubsubTopic PubSub topic name for the new registry's event change notification.
 * @param string $projectId Google Cloud project ID
 * @param string $location (Optional) Google Cloud region
 */
function create_registry(
    $registryId,
    $pubsubTopic,
    $projectId,
    $location = 'us-central1'
) {
    print('Creating Registry' . PHP_EOL);

    // The Google Cloud Client Library automatically checks the environment
    // variable GOOGLE_APPLICATION_CREDENTIALS for the Service Account
    // credentials, and defaults scopes to [
    //    'https://www.googleapis.com/auth/cloud-platform',
    //    'https://www.googleapis.com/auth/cloudiot'
    // ].
    $deviceManager = new DeviceManagerClient();
    $locationName = $deviceManager->locationName($projectId, $location);

    $pubsubTopicPath = sprintf('projects/%s/topics/%s', $projectId, $pubsubTopic);
    $eventNotificationConfig = (new EventNotificationConfig)
        ->setPubsubTopicName($pubsubTopicPath);

    $registry = (new DeviceRegistry)
        ->setId($registryId)
        ->setEventNotificationConfigs([$eventNotificationConfig]);

    $registry = $deviceManager->createDeviceRegistry($locationName, $registry);

    printf('Id: %s, Name: %s' . PHP_EOL,
        $registry->getId(),
        $registry->getName());
}

Python

This sample uses the Google API Client Library for Python.
client = get_client(service_account_json)
registry_parent = 'projects/{}/locations/{}'.format(
        project_id,
        cloud_region)
body = {
    'eventNotificationConfigs': [{
        'pubsubTopicName': pubsub_topic
    }],
    'id': registry_id
}
request = client.projects().locations().registries().create(
    parent=registry_parent, body=body)

try:
    response = request.execute()
    print('Created registry')
    return response
except HttpError:
    print('Error, registry not created')
    return ""

Ruby

# project_id   = "Your Google Cloud project ID"
# location_id  = "The Cloud region that you created the registry in"
# registry_id  = "The Google Cloud IoT Core device registry identifier"
# pubsub_topic = "The Google Cloud PubSub topic to use for this registry"

require "google/apis/cloudiot_v1"

# Initialize the client and authenticate with the specified scope
Cloudiot   = Google::Apis::CloudiotV1
iot_client = Cloudiot::CloudIotService.new
iot_client.authorization = Google::Auth.get_application_default(
  "https://www.googleapis.com/auth/cloud-platform"
)

# The project / location where the registry is created.
parent = "projects/#{project_id}/locations/#{location_id}"

registry = Cloudiot::DeviceRegistry.new
registry.id = registry_id
registry.event_notification_configs = [Cloudiot::EventNotificationConfig.new]
registry.event_notification_configs[0].pubsub_topic_name = pubsub_topic

registry = iot_client.create_project_location_registry(
  parent, registry
)

puts "Created registry: #{registry.name}"

List registries

The following sample shows you how to list registries:

C#

public static object ListRegistries(string projectId, string cloudRegion)
{
    var cloudIot = CreateAuthorizedClient();
    // The resource name of the location associated with the key rings.
    var parent = $"projects/{projectId}/locations/{cloudRegion}";
    Console.WriteLine("Registries:");
    try
    {
        var result = cloudIot.Projects.Locations.Registries.List(parent).Execute();

        result.DeviceRegistries.ToList().ForEach(registry =>
        {
            Console.WriteLine($"\t{registry.Id}");
        });
    }
    catch (Google.GoogleApiException e)
    {
        Console.WriteLine(e.Message);
        if (e.Error != null) return e.Error.Code;
        return -1;
    }
    return 0;
}

Go


// listRegistries gets the names of device registries given a project / region.
func listRegistries(w io.Writer, projectID string, region string) ([]*cloudiot.DeviceRegistry, error) {
	// Authorize the client using Application Default Credentials.
	// See https://g.co/dv/identity/protocols/application-default-credentials
	ctx := context.Background()
	httpClient, err := google.DefaultClient(ctx, cloudiot.CloudPlatformScope)
	if err != nil {
		return nil, err
	}
	client, err := cloudiot.New(httpClient)
	if err != nil {
		return nil, err
	}

	parent := fmt.Sprintf("projects/%s/locations/%s", projectID, region)
	response, err := client.Projects.Locations.Registries.List(parent).Do()
	if err != nil {
		return nil, err
	}

	if len(response.DeviceRegistries) == 0 {
		fmt.Fprintln(w, "No registries found")
		return response.DeviceRegistries, nil
	}

	fmt.Fprintf(w, "%d registries:\n", len(response.DeviceRegistries))
	for _, registry := range response.DeviceRegistries {
		fmt.Fprintf(w, "\t%s\n", registry.Name)
	}

	return response.DeviceRegistries, nil
}

Java

/** Lists all of the registries associated with the given project. */
public static void listRegistries(String projectId, String cloudRegion)
    throws GeneralSecurityException, IOException {
  GoogleCredential credential =
      GoogleCredential.getApplicationDefault().createScoped(CloudIotScopes.all());
  JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
  HttpRequestInitializer init = new RetryHttpInitializerWrapper(credential);
  final CloudIot service =
      new CloudIot.Builder(GoogleNetHttpTransport.newTrustedTransport(), jsonFactory, init)
          .setApplicationName(APP_NAME)
          .build();

  final String projectPath = "projects/" + projectId + "/locations/" + cloudRegion;

  List<DeviceRegistry> registries =
      service
          .projects()
          .locations()
          .registries()
          .list(projectPath)
          .execute()
          .getDeviceRegistries();

  if (registries != null) {
    System.out.println("Found " + registries.size() + " registries");
    for (DeviceRegistry r : registries) {
      System.out.println("Id: " + r.getId());
      System.out.println("Name: " + r.getName());
      if (r.getMqttConfig() != null) {
        System.out.println("Config: " + r.getMqttConfig().toPrettyString());
      }
      System.out.println();
    }
  } else {
    System.out.println("Project has no registries.");
  }
}

Node.js

// Client retrieved in callback
// getClient(serviceAccountJson, function(client) {...});
// const cloudRegion = 'us-central1';
// const projectId = 'adjective-noun-123';
const parentName = `projects/${projectId}/locations/${cloudRegion}`;

const request = {
  parent: parentName,
};

try {
  const {data} = await client.projects.locations.registries.list(request);
  console.log('Current registries in project:\n', data['deviceRegistries']);
} catch (err) {
  console.log('Could not list registries');
  console.log(err);
}

PHP

use Google\Cloud\Iot\V1\DeviceManagerClient;

/**
 * List all registries in the project.
 *
 * @param string $projectId Google Cloud project ID
 * @param string $location (Optional) Google Cloud region
 */
function list_registries(
    $projectId,
    $location = 'us-central1'
) {
    print('Listing Registries' . PHP_EOL);

    // The Google Cloud Client Library automatically checks the environment
    // variable GOOGLE_APPLICATION_CREDENTIALS for the Service Account
    // credentials, and defaults scopes to [
    //    'https://www.googleapis.com/auth/cloud-platform',
    //    'https://www.googleapis.com/auth/cloudiot'
    // ].
    $deviceManager = new DeviceManagerClient();
    $locationName = $deviceManager->locationName($projectId, $location);

    $response = $deviceManager->listDeviceRegistries($locationName);

    foreach ($response->iterateAllElements() as $registry) {
        printf(' - Id: %s, Name: %s' . PHP_EOL,
            $registry->getId(),
            $registry->getName());
    }
}

Python

This sample uses the Google API Client Library for Python.
print('Listing Registries')
registry_path = 'projects/{}/locations/{}'.format(
        project_id, cloud_region)
client = get_client(service_account_json)
registries = client.projects().locations().registries().list(
    parent=registry_path).execute().get('deviceRegistries', [])

for registry in registries:
    print('id: {}\n\tname: {}'.format(
        registry.get('id'),
        registry.get('name')))

return registries

Ruby

# project_id  = "Your Google Cloud project ID"
# location_id = "The Cloud region to list registries in"

require "google/apis/cloudiot_v1"

# Initialize the client and authenticate with the specified scope
Cloudiot   = Google::Apis::CloudiotV1
iot_client = Cloudiot::CloudIotService.new
iot_client.authorization = Google::Auth.get_application_default(
  "https://www.googleapis.com/auth/cloud-platform"
)

# The resource name of the location associated with the project
resource = "projects/#{project_id}/locations/#{location_id}"

# List the devices in the provided region
registries = iot_client.list_project_location_registries(
  resource
)

puts "Registries:"
if registries.device_registries && registries.device_registries.any?
  registries.device_registries.each { |registry| puts "\t#{registry.id}" }
else
  puts "\tNo device registries found in this region for your project."
end

Get a registry

The following sample shows you how to retrieve a registry:

C#

public static object GetRegistry(string projectId, string cloudRegion, string registryId)
{
    var cloudIot = CreateAuthorizedClient();
    // The resource name of the location associated with the key rings.
    var name = $"projects/{projectId}/locations/{cloudRegion}/registries/{registryId}";

    try
    {
        var registry = cloudIot.Projects.Locations.Registries.Get(name).Execute();
        Console.WriteLine($"Registry: {registry.Id}");
        Console.WriteLine("Notification Configurations:");
        registry.EventNotificationConfigs.ToList().ForEach(config =>
        {
            Console.WriteLine($"\tPubSub: {config.PubsubTopicName}");
        });
        Console.WriteLine($"HTTP Enabled: {registry.HttpConfig.HttpEnabledState}");
        Console.WriteLine($"MQTT Enabled: {registry.MqttConfig.MqttEnabledState}");
    }
    catch (Google.GoogleApiException e)
    {
        Console.WriteLine(e.Message);
        if (e.Error != null) return e.Error.Code;
        return -1;
    }
    return 0;
}

Go


// getRegistry gets information about a device registry given a registryID.
func getRegistry(w io.Writer, projectID string, region string, registryID string) (*cloudiot.DeviceRegistry, error) {
	// Authorize the client using Application Default Credentials.
	// See https://g.co/dv/identity/protocols/application-default-credentials
	ctx := context.Background()
	httpClient, err := google.DefaultClient(ctx, cloudiot.CloudPlatformScope)
	if err != nil {
		return nil, err
	}
	client, err := cloudiot.New(httpClient)
	if err != nil {
		return nil, err
	}

	parent := fmt.Sprintf("projects/%s/locations/%s/registries/%s", projectID, region, registryID)
	response, err := client.Projects.Locations.Registries.Get(parent).Do()
	if err != nil {
		return nil, err
	}

	fmt.Fprintln(w, "Got registry:")
	fmt.Fprintf(w, "\tID: %s\n", response.Id)
	fmt.Fprintf(w, "\tHTTP: %s\n", response.HttpConfig.HttpEnabledState)
	fmt.Fprintf(w, "\tMQTT: %s\n", response.MqttConfig.MqttEnabledState)
	fmt.Fprintf(w, "\tName: %s\n", response.Name)

	return response, nil
}

Java

/** Retrieves registry metadata from a project. * */
public static DeviceRegistry getRegistry(
    String projectId, String cloudRegion, String registryName)
    throws GeneralSecurityException, IOException {
  GoogleCredential credential =
      GoogleCredential.getApplicationDefault().createScoped(CloudIotScopes.all());
  JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
  HttpRequestInitializer init = new RetryHttpInitializerWrapper(credential);
  final CloudIot service =
      new CloudIot.Builder(GoogleNetHttpTransport.newTrustedTransport(), jsonFactory, init)
          .setApplicationName(APP_NAME)
          .build();

  final String registryPath =
      String.format(
          "projects/%s/locations/%s/registries/%s", projectId, cloudRegion, registryName);

  return service.projects().locations().registries().get(registryPath).execute();
}

Node.js

// Client retrieved in callback
// getClient(serviceAccountJson, function(client) {...});
// const cloudRegion = 'us-central1';
// const projectId = 'adjective-noun-123';
// const registryId = 'my-registry';
const parentName = `projects/${projectId}/locations/${cloudRegion}`;
const registryName = `${parentName}/registries/${registryId}`;
const request = {
  name: `${registryName}`,
};

try {
  const {data} = await client.projects.locations.registries.get(request);

  console.log('Found registry:', registryId);
  console.log(data);
} catch (err) {
  console.log('Could not find registry:', registryId);
  console.log(err);
}

PHP

use Google\Cloud\Iot\V1\DeviceManagerClient;

/**
 * Retrieves a device registry.
 *
 * @param string $registryId IOT Device Registry ID
 * @param string $projectId Google Cloud project ID
 * @param string $location (Optional) Google Cloud region
 */
function get_registry(
    $registryId,
    $projectId,
    $location = 'us-central1'
) {
    print('Getting Registry' . PHP_EOL);

    // Instantiate a client.
    $deviceManager = new DeviceManagerClient();
    $registryName = $deviceManager->registryName($projectId, $location, $registryId);

    $registry = $deviceManager->getDeviceRegistry($registryName);

    printf('Id: %s, Name: %s' . PHP_EOL,
        $registry->getId(),
        $registry->getName());
}

Python

This sample uses Google API Client Library for Python.
client = get_client(service_account_json)
registry_parent = 'projects/{}/locations/{}'.format(
        project_id,
        cloud_region)
topic_name = '{}/registries/{}'.format(registry_parent, registry_id)
request = client.projects().locations().registries().get(name=topic_name)
return request.execute()

Ruby

# project_id  = "Your Google Cloud project ID"
# location_id = "The Cloud region that you created the registry in"
# registry_id = "The Google Cloud IoT Core device registry identifier"

require "google/apis/cloudiot_v1"

# Initialize the client and authenticate with the specified scope
Cloudiot   = Google::Apis::CloudiotV1
iot_client = Cloudiot::CloudIotService.new
iot_client.authorization = Google::Auth.get_application_default(
  "https://www.googleapis.com/auth/cloud-platform"
)

# The resource name of the location associated with the project
resource = "projects/#{project_id}/locations/#{location_id}/registries/#{registry_id}"

# List the devices in the provided region
registry = iot_client.get_project_location_registry(
  resource
)

puts "#{registry.id}:"
puts "\tHTTP Config: #{registry.http_config.http_enabled_state}"
puts "\tMQTT Config: #{registry.mqtt_config.mqtt_enabled_state}"
puts "\tName: #{registry.name}"
if registry.event_notification_configs
  registry.event_notification_configs.each do |config|
    puts "\tTopic: #{config.pubsub_topic_name}"
  end
else
  puts "\tTopic: no associated topics"
end

Delete a registry

The following sample shows you how to delete a registry:

C#

public static object DeleteRegistry(string projectId, string cloudRegion, string registryId)
{
    var cloudIot = CreateAuthorizedClient();
    // The resource name of the location associated with the key rings.
    var name = $"projects/{projectId}/locations/{cloudRegion}/registries/{registryId}";

    try
    {
        var registry = cloudIot.Projects.Locations.Registries.Delete(name).Execute();
    }
    catch (Google.GoogleApiException e)
    {
        Console.WriteLine(e.Message);
        if (e.Error != null) return e.Error.Code;
        return -1;
    }
    return 0;
}

Go


// deleteRegistry deletes a device registry if it is empty.
func deleteRegistry(w io.Writer, projectID string, region string, registryID string) (*cloudiot.Empty, error) {
	// Authorize the client using Application Default Credentials.
	// See https://g.co/dv/identity/protocols/application-default-credentials
	ctx := context.Background()
	httpClient, err := google.DefaultClient(ctx, cloudiot.CloudPlatformScope)
	if err != nil {
		return nil, err
	}
	client, err := cloudiot.New(httpClient)
	if err != nil {
		return nil, err
	}

	name := fmt.Sprintf("projects/%s/locations/%s/registries/%s", projectID, region, registryID)
	response, err := client.Projects.Locations.Registries.Delete(name).Do()
	if err != nil {
		return nil, err
	}

	fmt.Fprintf(w, "Deleted registry: %s\n", registryID)

	return response, nil
}

Java

/** Delete this registry from Cloud IoT. */
public static void deleteRegistry(String cloudRegion, String projectId, String registryName)
    throws GeneralSecurityException, IOException {
  GoogleCredential credential =
      GoogleCredential.getApplicationDefault().createScoped(CloudIotScopes.all());
  JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
  HttpRequestInitializer init = new RetryHttpInitializerWrapper(credential);
  final CloudIot service =
      new CloudIot.Builder(GoogleNetHttpTransport.newTrustedTransport(), jsonFactory, init)
          .setApplicationName(APP_NAME)
          .build();

  final String registryPath =
      String.format(
        "projects/%s/locations/%s/registries/%s", projectId, cloudRegion, registryName);

  System.out.println("Deleting: " + registryPath);
  service.projects().locations().registries().delete(registryPath).execute();
}

Node.js

// Client retrieved in callback
// getClient(serviceAccountJson, function(client) {...});
// const cloudRegion = 'us-central1';
// const projectId = 'adjective-noun-123';
// const registryId = 'my-registry';
const parentName = `projects/${projectId}/locations/${cloudRegion}`;
const registryName = `${parentName}/registries/${registryId}`;
const request = {
  name: registryName,
};

try {
  const res = await client.projects.locations.registries.delete(request);

  console.log('Successfully deleted registry');
  console.log(res);
} catch (err) {
  console.log('Could not delete registry');
  console.log(err);
}

PHP

use Google\Cloud\Iot\V1\DeviceManagerClient;

/**
 * Deletes the specified registry.
 *
 * @param string $registryId IOT Device Registry ID
 * @param string $projectId Google Cloud project ID
 * @param string $location (Optional) Google Cloud region
 */
function delete_registry(
    $registryId,
    $projectId,
    $location = 'us-central1'
) {
    // Instantiate a client.
    $deviceManager = new DeviceManagerClient();

    // Format the full registry path
    $registryName = $deviceManager->registryName($projectId, $location, $registryId);

    $deviceManager->deleteDeviceRegistry($registryName);

    printf('Deleted Registry %s' . PHP_EOL, $registryId);
}

Python

This sample uses the Google API Client Library for Python.
print('Delete registry')
client = get_client(service_account_json)
registry_name = 'projects/{}/locations/{}/registries/{}'.format(
        project_id, cloud_region, registry_id)

registries = client.projects().locations().registries()
return registries.delete(name=registry_name).execute()

Ruby

# project_id  = "Your Google Cloud project ID"
# location_id = "The Cloud region that you created the registry in"
# registry_id = "The Google Cloud IoT Core device registry identifier"

require "google/apis/cloudiot_v1"

# Initialize the client and authenticate with the specified scope
Cloudiot   = Google::Apis::CloudiotV1
iot_client = Cloudiot::CloudIotService.new
iot_client.authorization = Google::Auth.get_application_default(
  "https://www.googleapis.com/auth/cloud-platform"
)

# The resource name of the location associated with the project
resource = "projects/#{project_id}/locations/#{location_id}/registries/#{registry_id}"

result = iot_client.delete_project_location_registry resource
puts "Deleted registry: #{registry_id}"

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Cloud IoT Core Documentation