IoT平台软件：Google Cloud IoT二次开发_JavaSDK使用指南

标签：google String IoT DeviceManagerClient Google 二次开发 import com cloud

Java SDK 使用指南

1. 环境准备

在开始使用 Google Cloud IoT 的 Java SDK 之前，需要确保您的开发环境已经配置好相关的依赖和工具。以下是环境准备的步骤：
在这里插入图片描述

1.1 安装 Java

确保您的系统中安装了最新版本的 Java 开发工具包（JDK）。您可以通过以下命令检查 Java 版本：


java -version

如果未安装，可以从 Oracle 或 OpenJDK 的官方网站下载并安装。

1.2 配置 Maven

Google Cloud IoT 的 Java SDK 通常通过 Maven 进行管理。确保您的系统中已经安装了 Maven。您可以通过以下命令检查 Maven 版本：


mvn -version

如果未安装，可以从 Maven 的官方网站下载并安装。

1.3 创建 Maven 项目

使用 Maven 创建一个新的 Java 项目。可以通过以下命令创建一个基本的 Maven 项目结构：


mvn archetype:generate -DgroupId=com.example -DartifactId=google-cloud-iot-example -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

1.4 添加依赖

在 pom.xml 文件中添加 Google Cloud IoT 的依赖。以下是一个示例 pom.xml 文件的内容：


<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example</groupId>

  <artifactId>google-cloud-iot-example</artifactId>

  <packaging>jar</packaging>

  <version>1.0-SNAPSHOT</version>

  <name>Google Cloud IoT Example</name>

  <url>http://maven.apache.org</url>



  <dependencies>

    <!-- Google Cloud IoT Core dependency -->

    <dependency>

      <groupId>com.google.cloud</groupId>

      <artifactId>google-cloud-iot</artifactId>

      <version>1.3.1</version>

    </dependency>



    <!-- Google Cloud Pub/Sub dependency -->

    <dependency>

      <groupId>com.google.cloud</groupId>

      <artifactId>google-cloud-pubsub</artifactId>

      <version>1.113.18</version>

    </dependency>



    <!-- Google Cloud Core dependency -->

    <dependency>

      <groupId>com.google.cloud</groupId>

      <artifactId>google-cloud-core</artifactId>

      <version>1.94.6</version>

    </dependency>



    <!-- Other dependencies -->

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>4.13.2</version>

      <scope>test</scope>

    </dependency>

  </dependencies>

</project>

1.5 配置 Google Cloud 项目

确保您的 Google Cloud 项目已经启用 IoT Core API。您可以在 Google Cloud Console 中进行操作，具体步骤如下：

登录到 Google Cloud Console。
选择您的项目。
转到“API 和服务” > “库”。
搜索并启用“Cloud IoT Core API”。

1.6 配置认证

Google Cloud IoT Core 使用 Google Cloud 的认证机制。您需要创建一个服务账户并下载 JSON 密钥文件。具体步骤如下：

在 Google Cloud Console 中，转到“IAM 和管理” > “服务账户”。
创建一个新的服务账户。
为该服务账户分配“Cloud IoT Core Admin”角色。
创建 JSON 密钥文件并下载。
将 JSON 密钥文件路径设置为环境变量 GOOGLE_APPLICATION_CREDENTIALS。


export GOOGLE_APPLICATION_CREDENTIALS="/path/to/your/service-account-file.json"

2. 创建设备注册表

在 Google Cloud IoT Core 中，设备注册表是管理设备的逻辑容器。本节将介绍如何使用 Java SDK 创建设备注册表。

2.1 初始化客户端

首先，需要初始化一个 DeviceManagerClient 实例，用于与 IoT Core 进行通信。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class DeviceRegistryExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      System.out.println("DeviceManagerClient initialized successfully.");

    }

  }

}

2.2 创建设备注册表

使用 DeviceManagerClient 实例创建一个新的设备注册表。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.CreateDeviceRegistryRequest;

import com.google.cloud.iot.v1.DeviceRegistry;

import com.google.cloud.iot.v1.LocationName;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class CreateDeviceRegistryExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表的名称和位置

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";



      // 创建设备注册表请求

      DeviceRegistry registry = DeviceRegistry.newBuilder()

          .setId(registryId)

          .build();



      CreateDeviceRegistryRequest request = CreateDeviceRegistryRequest.newBuilder()

          .setParent(LocationName.of(projectId, cloudRegion).toString())

          .setDeviceRegistry(registry)

          .build();



      // 创建设备注册表

      DeviceRegistry createdRegistry = client.createDeviceRegistry(request);

      System.out.println("Device registry created: " + createdRegistry.getName());

    }

  }

}

2.3 查看设备注册表

创建设备注册表后，可以使用 DeviceManagerClient 实例查看已创建的设备注册表。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceRegistry;

import com.google.cloud.iot.v1.RegistryName;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class ListDeviceRegistriesExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义项目和位置

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";



      // 列出设备注册表

      for (DeviceRegistry registry : client.listDeviceRegistries(LocationName.of(projectId, cloudRegion)).iterateAll()) {

        System.out.println("Device registry: " + registry.getName());

      }

    }

  }

}

3. 创建设备

创建设备注册表后，可以开始在注册表中创建设备。本节将介绍如何使用 Java SDK 创建设备。

3.1 创建设备

使用 DeviceManagerClient 实例创建一个新的设备。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.CreateDeviceRequest;

import com.google.cloud.iot.v1.Device;

import com.google.cloud.iot.v1.RegistryName;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class CreateDeviceExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 创建设备请求

      Device device = Device.newBuilder()

          .setId(deviceId)

          .build();



      CreateDeviceRequest request = CreateDeviceRequest.newBuilder()

          .setParent(RegistryName.of(projectId, cloudRegion, registryId).toString())

          .setDevice(device)

          .build();



      // 创建设备

      Device createdDevice = client.createDevice(request);

      System.out.println("Device created: " + createdDevice.getName());

    }

  }

}

3.2 查看设备

创建设备后，可以使用 DeviceManagerClient 实例查看已创建的设备。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class GetDeviceExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      Device device = client.getDevice(deviceName);

      System.out.println("Device details: " + device);

    }

  }

}

3.3 更新设备

更新设备的配置信息，例如设备元数据。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;

import com.google.cloud.iot.v1.UpdateDeviceRequest;

import com.google.protobuf.FieldMask;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class UpdateDeviceExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      Device device = client.getDevice(deviceName);



      // 更新设备元数据

      String metadataKey = "location";

      String metadataValue = "California";

      device = device.toBuilder()

          .putMetadata(metadataKey, metadataValue)

          .build();



      // 创建更新设备请求

      FieldMask updateMask = FieldMask.newBuilder()

          .addPaths("metadata")

          .build();



      UpdateDeviceRequest request = UpdateDeviceRequest.newBuilder()

          .setDevice(device)

          .setUpdateMask(updateMask)

          .build();



      // 更新设备

      Device updatedDevice = client.updateDevice(request);

      System.out.println("Device updated: " + updatedDevice.getName());

      System.out.println("Metadata: " + updatedDevice.getMetadataMap());

    }

  }

}

3.4 删除设备

删除不再需要的设备。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.protobuf.Empty;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class DeleteDeviceExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 删除设备

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      client.deleteDevice(deviceName);



      System.out.println("Device deleted: " + deviceName.toString());

    }

  }

}

4. 设备连接和通信

设备连接到 IoT Core 并进行通信是 IoT 应用程序的核心功能。本节将介绍如何使用 Java SDK 管理设备连接和通信。

4.1 创建客户端连接

使用 DeviceManagerClient 实例连接到设备并进行通信。以下是一个示例代码，展示了如何初始化 DeviceManagerClient 并获取设备信息。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class ConnectDeviceExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      Device device = client.getDevice(deviceName);



      System.out.println("Device details: " + device);



      // 连接设备并进行通信

      // 这里可以使用 MQTT 或 HTTP 协议进行通信

      // 例如，使用 MQTT 协议连接设备

      // 请确保您的设备已经配置了 MQTT 客户端

    }

  }

}

4.2 发布消息

使用 MQTT 协议向设备发布消息。以下是一个示例代码，展示了如何使用 DeviceManagerClient 发布设备事件和状态消息。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;

import com.google.cloud.iot.v1.PublishDeviceEventsRequest;

import com.google.cloud.iot.v1.PublishDeviceStateRequest;

import com.google.protobuf.ByteString;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class PublishMessageExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      Device device = client.getDevice(deviceName);



      System.out.println("Device details: " + device);



      // 发布设备事件消息

      String eventMessage = "Hello, IoT Core!";

      ByteString eventData = ByteString.copyFromUtf8(eventMessage);

      PublishDeviceEventsRequest eventRequest = PublishDeviceEventsRequest.newBuilder()

          .setName(deviceName.toString())

          .setBinaryData(eventData)

          .build();



      client.publishDeviceEvent(eventRequest);

      System.out.println("Event message published: " + eventMessage);



      // 发布设备状态消息

      String stateMessage = "Device is online";

      ByteString stateData = ByteString.copyFromUtf8(stateMessage);

      PublishDeviceStateRequest stateRequest = PublishDeviceStateRequest.newBuilder()

          .setName(deviceName.toString())

          .setBinaryData(stateData)

          .build();



      client.publishDeviceState(stateRequest);

      System.out.println("State message published: " + stateMessage);

    }

  }

}

4.3 订阅设备消息

使用 Google Cloud Pub/Sub 订阅设备发送的消息。以下是一个示例代码，展示了如何创建一个 Pub/Sub 订阅者并接收设备消息。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.pubsub.v1.AckReplyConsumer;

import com.google.cloud.pubsub.v1.MessageReceiver;

import com.google.cloud.pubsub.v1.Subscriber;

import com.google.pubsub.v1.ProjectSubscriptionName;

import com.google.pubsub.v1.PubsubMessage;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class SubscribeDeviceMessagesExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义项目和订阅名称

      String projectId = "your-project-id";

      String subscriptionId = "your-subscription-id";

      ProjectSubscriptionName subscriptionName = ProjectSubscriptionName.of(projectId, subscriptionId);



      // 创建 Pub/Sub 订阅者

      MessageReceiver receiver = (PubsubMessage message, AckReplyConsumer consumer) -> {

        System.out.println("Received message: " + message.getData().toStringUtf8());

        consumer.ack();

      };



      Subscriber subscriber = Subscriber.newBuilder(subscriptionName, receiver)

          .setCredentialsProvider(credentialsProvider)

          .build();



      // 启动订阅者

      subscriber.startAsync().awaitRunning();

      System.out.println("Listening for messages on " + subscriptionName.toString());



      // 保持程序运行以接收消息

      try {

        Thread.sleep(10000); // 等待 10 秒

      } catch (InterruptedException e) {

        e.printStackTrace();

      }



      // 停止订阅者

      subscriber.stopAsync();

      System.out.println("Stopped listening for messages");

    }

  }

}

4.4 配置设备通信

在设备注册表中配置设备的通信设置，例如启用或禁用设备的 MQTT 连接。以下是一个示例代码，展示了如何更新设备的通信配置。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;

import com.google.cloud.iot.v1.UpdateDeviceRequest;

import com.google.protobuf.FieldMask;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class ConfigureDeviceCommunicationExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      Device device = client.getDevice(deviceName);



      System.out.println("Device details: " + device);



      // 更新设备通信配置

      boolean enableMqtt = true;

      device = device.toBuilder()

          .setMqttConfig(Device.MqttConfig.newBuilder()

              .setMqttEnabledState(enableMqtt ? Device.MqttConfig.MqttEnabledState.MQTT_ENABLED : Device.MqttConfig.MqttEnabledState.MQTT_DISABLED)

              .build())

          .build();



      // 创建更新设备请求

      FieldMask updateMask = FieldMask.newBuilder()

          .addPaths("mqtt_config")

          .build();



      UpdateDeviceRequest request = UpdateDeviceRequest.newBuilder()

          .setDevice(device)

          .setUpdateMask(updateMask)

          .build();



      // 更新设备

      Device updatedDevice = client.updateDevice(request);

      System.out.println("Device updated: " + updatedDevice.getName());

      System.out.println("MQTT config: " + updatedDevice.getMqttConfig().getMqttEnabledState());

    }

  }

}

5. 设备管理

设备管理包括设备的配置、状态监控和故障排除。本节将介绍如何使用 Java SDK 进行设备管理。

5.1 获取设备配置

获取设备的当前配置信息。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;

import com.google.cloud.iot.v1.GetDeviceConfigRequest;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class GetDeviceConfigExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备配置

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      GetDeviceConfigRequest request = GetDeviceConfigRequest.newBuilder()

          .setName(deviceName.toString())

          .build();



      Device device = client.getDevice(request);

      System.out.println("Device configuration: " + device.getConfig().getBinaryData().toStringUtf8());

    }

  }

}

5.2 发送设备配置

向设备发送新的配置信息。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.DeviceConfig;

import com.google.cloud.iot.v1.ModifyCloudToDeviceConfigRequest;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class SendDeviceConfigExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 创建设备配置

      String configMessage = "New configuration for the device";

      ByteString configData = ByteString.copyFromUtf8(configMessage);

      DeviceConfig config = DeviceConfig.newBuilder()

          .setBinaryData(configData)

          .build();



      // 创建发送设备配置请求

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      ModifyCloudToDeviceConfigRequest request = ModifyCloudToDeviceConfigRequest.newBuilder()

          .setName(deviceName.toString())

          .setBinaryData(configData)

          .build();



      // 发送设备配置

      DeviceConfig sentConfig = client.modifyCloudToDeviceConfig(request);

      System.out.println("Configuration sent to device: " + sentConfig.getBinaryData().toStringUtf8());

    }

  }

}

5.3 监控设备状态

监控设备的当前状态，例如在线状态、最后连接时间等。


import com.google.cloud.iot.v1.DeviceManagerClient;

import com.google.cloud.iot.v1.DeviceManagerSettings;

import com.google.api.gax.core.CredentialsProvider;

import com.google.auth.oauth2.GoogleCredentials;

import com.google.cloud.iot.v1.DeviceName;

import com.google.cloud.iot.v1.Device;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class MonitorDeviceStateExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 DeviceManagerClient 实例

    CredentialsProvider credentialsProvider = () -> credentials;

    DeviceManagerSettings settings = DeviceManagerSettings.newBuilder()

        .setCredentialsProvider(credentialsProvider)

        .build();

    try (DeviceManagerClient client = DeviceManagerClient.create(settings)) {

      // 定义设备注册表和设备

      String projectId = "your-project-id";

      String cloudRegion = "us-central1";

      String registryId = "your-registry-id";

      String deviceId = "your-device-id";



      // 获取设备状态

      DeviceName deviceName = DeviceName.of(projectId, cloudRegion, registryId, deviceId);

      Device device = client.getDevice(deviceName);



      System.out.println("Device ID: " + device.getId());

      System.out.println("Device status: " + device.getConnectionState());

      System.out.println("Last connection time: " + device.getLastConnectionTimestamp());

      System.out.println("Last event time: " + device.getLastEventTimestamp());

      System.out.println("Last state time: " + device.getLastStateTimestamp());

    }

  }

}

5.4 故障排除

进行设备的故障排除，例如查看设备的日志信息。


import com.google.cloud.logging.Logging;

import com.google.cloud.logging.LoggingOptions;

import com.google.cloud.logging.LogEntry;

import com.google.cloud.logging.Payload;

import com.google.cloud.logging.WriteResult;



import java.io.IOException;

import java.nio.file.Files;

import java.nio.file.Paths;



public class DeviceTroubleshootingExample {

  public static void main(String[] args) throws IOException {

    // 读取 JSON 密钥文件

    String keyFilePath = "/path/to/your/service-account-file.json";

    GoogleCredentials credentials = GoogleCredentials.fromStream(Files.newInputStream(Paths.get(keyFilePath)));



    // 创建 Logging 实例

    LoggingOptions options = LoggingOptions.newBuilder()

        .setCredentials(credentials)

        .build();

    try (Logging logging = options.getService()) {

      // 定义日志名称

      String logName = "projects/your-project-id/logs/cloudiot.googleapis.com%2Fdevice";



      // 获取日志条目

      for (LogEntry entry : logging.listLogEntries(10, logName).iterateAll()) {

        System.out.println("Log entry: " + entry.getPayload(Payload.StringPayload.class).AsString());

      }

    }

  }

}

通过以上步骤，您可以使用 Java SDK 完成 Google Cloud IoT Core 的环境准备、设备注册表管理、设备管理以及设备连接和通信。希望这些示例代码对您的开发工作有所帮助。如果您有任何问题或需要进一步的帮助，请参考 Google Cloud IoT Core 的官方文档。

标签：google,String,IoT,DeviceManagerClient,Google,二次开发,import,com,cloud
From： https://blog.csdn.net/chenlz2007/article/details/143026939