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Cloud Platforms > Google Cloud Platform (GCP) > Cloud IoT Core

Cloud IoT Core

Author: Venkata Sudhakar

Google Cloud IoT Core is a fully managed service that allows you to easily and securely connect, manage, and ingest data from globally dispersed IoT devices. It integrates with Google Cloud services like Pub/Sub, Dataflow, and BigQuery to build comprehensive IoT solutions.

Key Components of Cloud IoT Core:

1. Device Manager - Register, configure, and monitor IoT devices.

2. Protocol Bridge - Supports MQTT and HTTP protocols for device communication.

3. Cloud Pub/Sub Integration - Streams device telemetry data to Pub/Sub topics.

4. Device Registry - Logical group of devices with shared configuration.

5. Device Authentication - Supports RSA and EC public key authentication.

The below example shows how to create a device registry and register a device using the Cloud IoT Core API in Java.

import com.google.api.client.googleapis.auth.oauth2.GoogleCredential;
import com.google.api.client.http.javanet.NetHttpTransport;
import com.google.api.client.json.jackson2.JacksonFactory;
import com.google.api.services.cloudiot.v1.CloudIot;
import com.google.api.services.cloudiot.v1.model.Device;
import com.google.api.services.cloudiot.v1.model.DeviceCredential;
import com.google.api.services.cloudiot.v1.model.DeviceRegistry;
import com.google.api.services.cloudiot.v1.model.PublicKeyCredential;

import java.util.Arrays;
import java.util.Collections;

public class CloudIotCoreExample {

public static void main(String[] args) throws Exception {
        String projectId = "your-project-id";
        String cloudRegion = "us-central1";
        String registryId = "my-iot-registry";
        String deviceId = "my-iot-device";
        String pubsubTopic = "projects/" + projectId + "/topics/iot-telemetry";

GoogleCredential credential = GoogleCredential.getApplicationDefault()
            .createScoped(Collections.singleton(
                "https://www.googleapis.com/auth/cloud-platform"));

CloudIot service = new CloudIot.Builder(
            new NetHttpTransport(),
            JacksonFactory.getDefaultInstance(),
            credential)
            .setApplicationName("CloudIotExample")
            .build();

String parent = "projects/" + projectId + "/locations/" + cloudRegion;

// Create Device Registry
        DeviceRegistry registry = new DeviceRegistry()
            .setId(registryId)
            .setEventNotificationConfigs(Arrays.asList(
                new com.google.api.services.cloudiot.v1.model
                    .EventNotificationConfig()
                    .setPubsubTopicName(pubsubTopic)));

DeviceRegistry createdRegistry = service.projects().locations()
            .registries().create(parent, registry).execute();
        System.out.println("Registry created: " + createdRegistry.getId());

// Register a Device
        String registryPath = parent + "/registries/" + registryId;
        Device device = new Device().setId(deviceId);

Device createdDevice = service.projects().locations()
            .registries().devices().create(registryPath, device).execute();
        System.out.println("Device registered: " + createdDevice.getId());
    }
}

It gives the following output,

Registry created: my-iot-registry
Device registered: my-iot-device

Cloud IoT Core Workflow:

1. Create Registry - Define a device registry linked to a Pub/Sub topic.

2. Register Devices - Add IoT devices with public key credentials.

3. Connect Devices - Devices connect via MQTT or HTTP and send telemetry data.

4. Process Data - Pub/Sub delivers data to Dataflow, BigQuery, or Cloud Functions.

5. Monitor Devices - Use Cloud Monitoring for device health and activity metrics.

Send your comments, suggestions or queries regarding this site to [email protected].