教程:开发适用于 Linux 设备的 C IoT Edge 模块Tutorial: Develop a C IoT Edge module for Linux devices

使用 Visual Studio Code 开发 C 代码并将其部署到运行 Azure IoT Edge 的 Linux 设备。Use Visual Studio Code to develop C code and deploy it to a Linux device running Azure IoT Edge.

可以使用 IoT Edge 模块部署代码,以直接将业务逻辑实现到 IoT Edge 设备。You can use IoT Edge modules to deploy code that implements your business logic directly to your IoT Edge devices. 本教程详细介绍如何创建并部署用于筛选传感器数据的 IoT Edge 模块。This tutorial walks you through creating and deploying an IoT Edge module that filters sensor data. 在本教程中,你将了解如何执行以下操作:In this tutorial, you learn how to:

  • 使用 Visual Studio Code 在 C 中创建 IoT Edge 模块Use Visual Studio Code to create an IoT Edge module in C
  • 使用 Visual Studio Code 和 Docker 创建 Docker 映像并将其发布到容器注册表Use Visual Studio Code and Docker to create a docker image and publish it to a container registry
  • 将模块部署到 IoT Edge 设备Deploy the module to your IoT Edge device
  • 查看生成的数据View generated data

在本教程中创建的 IoT Edge 模块可以筛选由设备生成的温度数据。The IoT Edge module that you create in this tutorial filters the temperature data generated by your device. 它只在温度高于指定阈值的情况下,向上游发送消息。It only sends messages upstream if the temperature is above a specified threshold. 在边缘进行的此类分析适用于减少传递到云中和存储在云中的数据量。This type of analysis at the edge is useful for reducing the amount of data communicated to and stored in the cloud.

如果没有 Azure 试用版订阅,请在开始前创建一个试用版订阅If you don't have an Azure trail subscription, create a trial subscription before you begin.


本教程演示如何使用 Visual Studio CodeC 中开发模块,以及如何将其部署到 Linux 设备This tutorial demonstrates how to develop a module in C using Visual Studio Code, and how to deploy it to a Linux device. 如果要开发适用于 Windows 设备的模块,请转到开发适用于 Windows 设备的 C IoT Edge 模块If you're developing modules for Windows devices, go to Develop a C IoT Edge module for Windows devices instead.

使用下表了解开发 C 模块并将其部署到 Linux 的选项:Use the following table to understand your options for developing and deploying C modules to Linux:

CC Visual Studio CodeVisual Studio Code Visual StudioVisual Studio
Linux AMD64Linux AMD64 在 Linux AMD64 上使用适用于 C 模块的 VS Code 在 Linux AMD64 上使用适用于 C 模块的 VS
Linux ARM32Linux ARM32 在 Linux ARM32 上使用适用于 C 模块的 VS Code 在 Linux ARM32 上使用适用于 C 模块的 VS

在开始学习本教程之前,应已完成上一篇教程来设置用于开发 Linux 容器的开发环境:开发适用于 Linux 设备的 IoT Edge 模块Before beginning this tutorial, you should have gone through the previous tutorial to set up your development environment for Linux container development: Develop IoT Edge modules for Linux devices. 完成该教程后,已应准备好以下必备组件:By completing that tutorial, you should have the following prerequisites in place:

若要在 C 中开发 IoT Edge 模块,请在开发计算机上安装以下附加系统必备组件:To develop an IoT Edge module in C, install the following additional prerequisites on your development machine:

本教程不需要安装 Azure IoT C SDK,但它可提供有用的功能,如 IntelliSense 和读取程序定义。Installing the Azure IoT C SDK is not required for this tutorial, but can provide helpful functionality like intellisense and reading program definitions. 有关安装的信息,请参阅 Azure IoT C SDK 和库For installation information, see Azure IoT C SDKs and Libraries.

创建模块项目Create a module project

以下步骤使用 Visual Studio Code 和 Azure IoT Tools 扩展为 C 创建 IoT Edge 模块项目。The following steps create an IoT Edge module project for C by using Visual Studio Code and the Azure IoT Tools extension. 创建项目模板后,请添加新代码,使模块根据其报告属性筛选出消息。Once you have a project template created, add new code so that the module filters out messages based on their reported properties.

创建新项目Create a new project

创建可以使用自己的代码进行自定义的 C 解决方案模板。Create a C solution template that you can customize with your own code.

  1. 选择“视图” > “命令面板”,打开 VS Code 命令面板。Select View > Command Palette to open the VS Code command palette.

  2. 在命令面板中,键入并运行 Azure:Sign in 命令并按照说明登录到 Azure 帐户。In the command palette, type and run the command Azure: Sign in and follow the instructions to sign in your Azure account. 如果已登录,则可跳过此步骤。If you've already signed in, you can skip this step.

  3. 在命令面板中,键入并运行 Azure IoT Edge:New IoT Edge solution 命令。In the command palette, type and run the command Azure IoT Edge: New IoT Edge solution. 按命令面板中的提示创建解决方案。Follow the prompts in the command palette to create your solution.

    字段Field Value
    选择文件夹Select folder 在适用于 VS Code 的开发计算机上选择用于创建解决方案文件的位置。Choose the location on your development machine for VS Code to create the solution files.
    提供解决方案名称Provide a solution name 输入解决方案的描述性名称,或者接受默认的 EdgeSolutionEnter a descriptive name for your solution or accept the default EdgeSolution.
    选择模块模板Select module template 选择“C 模块”。Choose C Module.
    提供模块名称Provide a module name 将模块命名为 CModuleName your module CModule.
    为模块提供 Docker 映像存储库Provide Docker image repository for the module 映像存储库包含容器注册表的名称和容器映像的名称。An image repository includes the name of your container registry and the name of your container image. 容器映像是基于你在上一步中提供的名称预先填充的。Your container image is prepopulated from the name you provided in the last step. 将 localhost:5000 替换为 Azure 容器注册表中的“登录服务器”值。Replace localhost:5000 with the Login server value from your Azure container registry. 可以在 Azure 门户的容器注册表的“概述”页中检索登录服务器。You can retrieve the Login server from the Overview page of your container registry in the Azure portal.

    最终的映像存储库看起来类似于 <registry name>.azurecr.cn/cmodule。The final image repository looks like <registry name>.azurecr.cn/cmodule.

    提供 Docker 映像存储库

添加注册表凭据Add your registry credentials

环境文件存储容器注册表的凭据,并将其与 IoT Edge 运行时共享。The environment file stores the credentials for your container registry and shares them with the IoT Edge runtime. 此运行时需要这些凭据才能将专用映像拉取到 IoT Edge 设备中。The runtime needs these credentials to pull your private images onto the IoT Edge device.

IoT Edge 扩展尝试从 Azure 中拉取容器注册表凭据并将其填充到环境文件中。The IoT Edge extension tries to pull your container registry credentials from Azure and populate them in the environment file. 检查凭据是否已包含在内。Check to see if your credentials are already included. 如果没有,请立即添加:If not, add them now:

  1. 在 VS Code 资源管理器中,打开 .env 文件。In the VS Code explorer, open the .env file.
  2. 使用从 Azure 容器注册表复制的 usernamepassword 值更新相关字段。Update the fields with the username and password values that you copied from your Azure container registry.
  3. 保存此文件。Save this file.

选择目标体系结构Select your target architecture

目前,Visual Studio Code 可以开发适用于 Linux AMD64 和 Linux ARM32v7 设备的 C 模块。Currently, Visual Studio Code can develop C modules for Linux AMD64 and Linux ARM32v7 devices. 需要选择面向每个解决方案的体系结构,因为每种体系结构类型的容器的生成和运行方式均不相同。You need to select which architecture you're targeting with each solution, because the container is built and run differently for each architecture type. 默认值为 Linux AMD64。The default is Linux AMD64.

  1. 打开命令面板并搜索 Azure IoT Edge:Set Default Target Platform for Edge Solution,或选择窗口底部侧栏中的快捷方式图标。Open the command palette and search for Azure IoT Edge: Set Default Target Platform for Edge Solution, or select the shortcut icon in the side bar at the bottom of the window.

  2. 在命令面板中,从选项列表中选择目标体系结构。In the command palette, select the target architecture from the list of options. 在本教程中,我们使用 Ubuntu 虚拟机作为 IoT Edge 设备,因此将保留默认的“amd64” 。For this tutorial, we're using an Ubuntu virtual machine as the IoT Edge device, so will keep the default amd64.

使用自定义代码更新模块Update the module with custom code

默认模块代码在输入队列上接收消息,并通过输出队列传递消息。The default module code receives messages on an input queue and passes them along through an output queue. 让我们添加一些附加的代码,使模块在将消息转发到 IoT 中心之前,先在边缘上对其进行处理。Let's add some additional code so that the module processes the messages at the edge before forwarding them to IoT Hub. 更新模块,以便分析每条消息中的温度数据,并且只有在温度超过特定阈值时才将消息发送到 IoT 中心。Update the module so that it analyzes the temperature data in each message, and only sends the message to IoT Hub if the temperature exceeds a certain threshold.

  1. 在此场景中,来自传感器的数据采用 JSON 格式。The data from the sensor in this scenario comes in JSON format. 若要筛选 JSON 格式的消息,请导入用于 C 的 JSON 库。本教程使用 Parson。To filter messages in JSON format, import a JSON library for C. This tutorial uses Parson.

    1. 下载 Parson GitHub 存储库Download the Parson GitHub repository. parson.cparson.h 文件复制到 CModule 文件夹中。Copy the parson.c and parson.h files into the CModule folder.

    2. 打开“模块” > “CModule” > “CMakeLists.txt”。Open modules > CModule > CMakeLists.txt. 在文件顶部,导入名为 my_parson 的充当库的 Parson 文件。At the top of the file, import the Parson files as a library called my_parson.

    3. my_parson 添加到 CMakeLists.txt 的 target_link_libraries 函数中的库列表。Add my_parson to the list of libraries in the target_link_libraries function of CMakeLists.txt.

    4. 保存 CMakeLists.txt 文件。Save the CMakeLists.txt file.

    5. 打开“模块” > “CModule” > “main.c”。Open modules > CModule > main.c. 在 include 语句列表的底部,添加一个新的语句,以便包括适用于 JSON 支持的 parson.hAt the bottom of the list of include statements, add a new one to include parson.h for JSON support:

      #include "parson.h"
  2. main.c 文件中,在 include 节后面添加名为 temperatureThreshold 的全局变量。In the main.c file, add a global variable called temperatureThreshold after the include section. 此变量设置一个值,若要向 IoT 中心发送数据,测量的温度必须超出该值。This variable sets the value that the measured temperature must exceed in order for the data to be sent to IoT Hub.

    static double temperatureThreshold = 25;
  3. 在 main.c 中找到 CreateMessageInstance 函数。Find the CreateMessageInstance function in main.c. 将内部的 if-else 语句替换为以下代码,以添加几行功能:Replace the inner if-else statement with the following code that adds a few lines of functionality:

        if ((messageInstance->messageHandle = IoTHubMessage_Clone(message)) == NULL)
            messageInstance = NULL;
            messageInstance->messageTrackingId = messagesReceivedByInput1Queue;
            MAP_HANDLE propMap = IoTHubMessage_Properties(messageInstance->messageHandle);
            if (Map_AddOrUpdate(propMap, "MessageType", "Alert") != MAP_OK)
               printf("ERROR: Map_AddOrUpdate Failed!\r\n");

    else 语句中的新代码行将一个新属性添加到消息,用于将消息标记为警报。The new lines of code in the else statement add a new property to the message, which labels the message as an alert. 此代码将所有消息标记为警报,因为仅当报告了较高的温度时,我们要添加的功能才会向 IoT 中心发送消息。This code labels all messages as alerts, because we'll add functionality that only sends messages to IoT Hub if they report high temperatures.

  4. 将整个 InputQueue1Callback 函数替换为以下代码。Replace the entire InputQueue1Callback function with the following code. 此函数实现实际的消息传送筛选器。This function implements the actual messaging filter. 收到消息后,它会检查报告的温度是否超过阈值。When a message is received, it checks whether the reported temperature exceeds the threshold. 如果超过了阈值,则通过其输出队列转发消息。If yes, then it forwards the message through its output queue. 如果未超过阈值,则忽略消息。If not, then it ignores the message.

    static unsigned char *bytearray_to_str(const unsigned char *buffer, size_t len)
        unsigned char *ret = (unsigned char *)malloc(len + 1);
        memcpy(ret, buffer, len);
        ret[len] = '\0';
        return ret;
    static IOTHUBMESSAGE_DISPOSITION_RESULT InputQueue1Callback(IOTHUB_MESSAGE_HANDLE message, void* userContextCallback)
        IOTHUB_CLIENT_RESULT clientResult;
        IOTHUB_MODULE_CLIENT_LL_HANDLE iotHubModuleClientHandle = (IOTHUB_MODULE_CLIENT_LL_HANDLE)userContextCallback;
        unsigned const char* messageBody;
        size_t contentSize;
        if (IoTHubMessage_GetByteArray(message, &messageBody, &contentSize) == IOTHUB_MESSAGE_OK)
            messageBody = bytearray_to_str(messageBody, contentSize);
        } else
            messageBody = "<null>";
        printf("Received Message [%zu]\r\n Data: [%s]\r\n",
                messagesReceivedByInput1Queue, messageBody);
        // Check if the message reports temperatures higher than the threshold
        JSON_Value *root_value = json_parse_string(messageBody);
        JSON_Object *root_object = json_value_get_object(root_value);
        double temperature;
        if (json_object_dotget_value(root_object, "machine.temperature") != NULL && (temperature = json_object_dotget_number(root_object, "machine.temperature")) > temperatureThreshold)
            printf("Machine temperature %f exceeds threshold %f\r\n", temperature, temperatureThreshold);
            // This message should be sent to next stop in the pipeline, namely "output1".  What happens at "outpu1" is determined
            // by the configuration of the Edge routing table setup.
            MESSAGE_INSTANCE *messageInstance = CreateMessageInstance(message);
            if (NULL == messageInstance)
                result = IOTHUBMESSAGE_ABANDONED;
                printf("Sending message (%zu) to the next stage in pipeline\n", messagesReceivedByInput1Queue);
                clientResult = IoTHubModuleClient_LL_SendEventToOutputAsync(iotHubModuleClientHandle, messageInstance->messageHandle, "output1", SendConfirmationCallback, (void *)messageInstance);
                if (clientResult != IOTHUB_CLIENT_OK)
                    printf("IoTHubModuleClient_LL_SendEventToOutputAsync failed on sending msg#=%zu, err=%d\n", messagesReceivedByInput1Queue, clientResult);
                    result = IOTHUBMESSAGE_ABANDONED;
                    result = IOTHUBMESSAGE_ACCEPTED;
            printf("Not sending message (%zu) to the next stage in pipeline.\r\n", messagesReceivedByInput1Queue);
            result = IOTHUBMESSAGE_ACCEPTED;
        return result;
  5. 添加 moduleTwinCallback 函数。Add a moduleTwinCallback function. 此方法从孪生模块接收所需属性的更新,然后更新 temperatureThreshold 变量,使之匹配。This method receives updates on the desired properties from the module twin, and updates the temperatureThreshold variable to match. 所有模块都有自己的孪生模块,因此可以直接从云配置在模块中运行的代码。All modules have their own module twin, which lets you configure the code running inside a module directly from the cloud.

    static void moduleTwinCallback(DEVICE_TWIN_UPDATE_STATE update_state, const unsigned char* payLoad, size_t size, void* userContextCallback)
        printf("\r\nTwin callback called with (state=%s, size=%zu):\r\n%s\r\n",
            MU_ENUM_TO_STRING(DEVICE_TWIN_UPDATE_STATE, update_state), size, payLoad);
        JSON_Value *root_value = json_parse_string(payLoad);
        JSON_Object *root_object = json_value_get_object(root_value);
        if (json_object_dotget_value(root_object, "desired.TemperatureThreshold") != NULL) {
            temperatureThreshold = json_object_dotget_number(root_object, "desired.TemperatureThreshold");
        if (json_object_get_value(root_object, "TemperatureThreshold") != NULL) {
            temperatureThreshold = json_object_get_number(root_object, "TemperatureThreshold");
  6. 找到 SetupCallbacksForModule 函数。Find the SetupCallbacksForModule function. 将该函数替换为以下代码,以添加 else if 语句来检查模块孪生是否已更新。Replace the function with the following code that adds an else if statement to check if the module twin has been updated.

    static int SetupCallbacksForModule(IOTHUB_MODULE_CLIENT_LL_HANDLE iotHubModuleClientHandle)
        int ret;
        if (IoTHubModuleClient_LL_SetInputMessageCallback(iotHubModuleClientHandle, "input1", InputQueue1Callback, (void*)iotHubModuleClientHandle) != IOTHUB_CLIENT_OK)
            printf("ERROR: IoTHubModuleClient_LL_SetInputMessageCallback(\"input1\")..........FAILED!\r\n");
            ret = MU_FAILURE;
        else if (IoTHubModuleClient_LL_SetModuleTwinCallback(iotHubModuleClientHandle, moduleTwinCallback, (void*)iotHubModuleClientHandle) != IOTHUB_CLIENT_OK)
            printf("ERROR: IoTHubModuleClient_LL_SetModuleTwinCallback(default)..........FAILED!\r\n");
            ret = MU_FAILURE;
            ret = 0;
        return ret;
  7. 保存 main.c 文件。Save the main.c file.

  8. 在 VS Code 资源管理器的 IoT Edge 解决方案工作区中打开 deployment.template.json 文件。In the VS Code explorer, open the deployment.template.json file in your IoT Edge solution workspace.

  9. 将 CModule 模块孪生添加到部署清单。Add the CModule module twin to the deployment manifest. moduleContent 节底部 $edgeHub 模块孪生后插入以下 JSON 内容:Insert the following JSON content at the bottom of the moduleContent section, after the $edgeHub module twin:

    "CModule": {

    将 CModule 孪生添加到部署模板

  10. 保存 deployment.template.json 文件。Save the deployment.template.json file.

生成并推送模块Build and push your module

在上一部分,你已经创建了一个 IoT Edge 解决方案并将代码添加到了 CModule,该函数会筛选出其中报告的计算机温度处于可接受限制范围内的消息。In the previous section, you created an IoT Edge solution and added code to the CModule that will filter out messages where the reported machine temperature is within the acceptable limits. 现在需将解决方案生成为容器映像并将其推送到容器注册表。Now you need to build the solution as a container image and push it to your container registry.

  1. 打开 VS Code 终端,方法是选择“视图” > “终端” 。Open the VS Code terminal by selecting View > Terminal.

  2. 在终端中输入以下命令,以登录到 Docker。Sign in to Docker by entering the following command in the terminal. 使用 Azure 容器注册表中的用户名、密码和登录服务器登录。Sign in with the username, password, and login server from your Azure container registry. 可以在 Azure 门户中从注册表的“访问密钥”部分检索这些值。You can retrieve these values from the Access keys section of your registry in the Azure portal.

    docker login -u <ACR username> -p <ACR password> <ACR login server>

    可能会收到一条安全警告,推荐使用 --password-stdinYou may receive a security warning recommending the use of --password-stdin. 这条最佳做法是针对生产方案建议的,这超出了本教程的范畴。While that best practice is recommended for production scenarios, it's outside the scope of this tutorial. 有关详细信息,请参阅 docker login 参考。For more information, see the docker login reference.

  3. 在 VS Code 资源管理器中右键单击“deployment.template.json”文件,然后选择“生成并推送 IoT Edge 解决方案”。 In the VS Code explorer, right-click the deployment.template.json file and select Build and Push IoT Edge Solution.

    “生成并推送”命令会启动三项操作。The build and push command starts three operations. 首先,它在解决方案中创建名为 config 的新文件夹,用于保存基于部署模板和其他解决方案文件中的信息生成的完整部署清单。First, it creates a new folder in the solution called config that holds the full deployment manifest, built out of information in the deployment template and other solution files. 其次,它会运行 docker build,以基于目标体系结构的相应 dockerfile 生成容器映像。Second, it runs docker build to build the container image based on the appropriate dockerfile for your target architecture. 然后,它会运行 docker push,以将映像存储库推送到容器注册表。Then, it runs docker push to push the image repository to your container registry.

    首次执行此过程可能需要几分钟时间,但下次运行命令时速度会变快。This process may take several minutes the first time, but is faster the next time that you run the commands.

将模块部署到设备Deploy modules to device

使用 Visual Studio Code 资源管理器和 Azure IoT Tools 扩展将模块项目部署到 IoT Edge 设备。Use the Visual Studio Code explorer and the Azure IoT Tools extension to deploy the module project to your IoT Edge device. 你已经为方案准备了部署清单,即 config 文件夹中的 deployment.amd64.json 文件。You already have a deployment manifest prepared for your scenario, the deployment.amd64.json file in the config folder. 现在需要做的就是选择一个设备来接收部署。All you need to do now is select a device to receive the deployment.

确保 IoT Edge 设备已启动并运行。Make sure that your IoT Edge device is up and running.

  1. 在 Visual Studio Code 资源管理器中的“Azure IoT 中心”部分下,展开“设备”可查看 IoT 设备的列表。 In the Visual Studio Code explorer, under the Azure IoT Hub section, expand Devices to see your list of IoT devices.

  2. 右键单击 IoT Edge 设备的名称,然后选择“为单个设备创建部署”。Right-click the name of your IoT Edge device, then select Create Deployment for Single Device.

  3. 选择 config 文件夹中的 deployment.amd64.json 文件,然后单击“选择 Edge 部署清单”。 Select the deployment.amd64.json file in the config folder and then click Select Edge Deployment Manifest. 不要使用 deployment.template.json 文件。Do not use the deployment.template.json file.

  4. 在设备下,展开“模块”可查看已部署的正在运行的模块的列表。Under your device, expand Modules to see a list of deployed and running modules. 单击“刷新”按钮。Click the refresh button. 此时应看到新的 CModuleSimulatedTemperatureSensor 模块以及 $edgeAgent$edgeHub 一起运行。You should see the new CModule running along with the SimulatedTemperatureSensor module and the $edgeAgent and $edgeHub.

    启动模块可能需要数分钟时间。It may take a few minutes for the modules to start. IoT Edge 运行时需要接收其新的部署清单,从容器运行时下拉模块映像,然后启动每个新模块。The IoT Edge runtime needs to receive its new deployment manifest, pull down the module images from the container runtime, then start each new module.

查看生成的数据View generated data

将部署清单应用到 IoT Edge 设备以后,设备上的 IoT Edge 运行时就会收集新的部署信息并开始在其上执行操作。Once you apply the deployment manifest to your IoT Edge device, the IoT Edge runtime on the device collects the new deployment information and starts executing on it. 在设备上运行的未包括在部署清单中的任何模块都会停止。Any modules running on the device that aren't included in the deployment manifest are stopped. 设备中缺失的任何模块都会启动。Any modules missing from the device are started.

  1. 在 Visual Studio Code 资源管理器中右键单击 IoT Edge 设备的名称,选择“开始监视内置事件终结点”。In the Visual Studio Code explorer, right-click the name of your IoT Edge device and select Start Monitoring Built-in Event Endpoint.

  2. 查看抵达 IoT 中心的消息。View the messages arriving at your IoT Hub. 消息可能需要在一段时间后才会抵达,因为 IoT Edge 设备必须接收其新部署并启动所有模块。It may take a while for the messages to arrive, because the IoT Edge device has to receive its new deployment and start all the modules. 然后,我们对 CModule 代码所做的更改将等到计算机温度达到 25 度时才发送消息。Then, the changes we made to the CModule code wait until the machine temperature reaches 25 degrees before sending messages. IoT 中心还会将消息类型“警报”添加到达到该温度阈值的任何消息。It also adds the message type Alert to any messages that reach that temperature threshold.

    查看抵达 IoT 中心的消息

编辑模块孪生Edit the module twin

我们使用部署清单中的 CModule 模块孪生将温度阈值设置为 25 度。We used the CModule module twin in the deployment manifest to set the temperature threshold at 25 degrees. 可以使用模块孪生来更改功能,而无需更新模块代码。You can use the module twin to change the functionality without having to update the module code.

  1. 在 Visual Studio Code 中,展开 IoT Edge 设备下的详细信息以查看正在运行的模块。In Visual Studio Code, expand the details under your IoT Edge device to see the running modules.

  2. 右键单击“CModule”并选择“编辑模块孪生” 。Right-click CModule and select Edit module twin.

  3. 在所需属性中找到 TemperatureThresholdFind TemperatureThreshold in the desired properties. 将其值更改为比上次报告的温度高出 5 到 10 度的新温度。Change its value to a new temperature 5 degrees to 10 degrees higher than the latest reported temperature.

  4. 保存模块孪生文件。Save the module twin file.

  5. 右键单击模块孪生编辑窗格中的任意位置,然后选择“更新模块孪生”。Right-click anywhere in the module twin editing pane and select Update module twin.

  6. 监视传入的设备到云消息。Monitor the incoming device-to-cloud messages. 应会看到,在达到新的温度阈值之前,消息会停止发送。You should see the messages stop until the new temperature threshold is reached.

清理资源Clean up resources

如果打算继续学习下一篇建议的文章,可以保留已创建的资源和配置,以便重复使用。If you plan to continue to the next recommended article, you can keep the resources and configurations that you created and reuse them. 还可以继续使用相同的 IoT Edge 设备作为测试设备。You can also keep using the same IoT Edge device as a test device.

否则,可以删除本文中使用的本地配置和 Azure 资源,以免产生费用。Otherwise, you can delete the local configurations and the Azure resources that you used in this article to avoid charges.

删除 Azure 资源Delete Azure resources

删除 Azure 资源和资源组的操作不可逆。Deleting Azure resources and resource groups is irreversible. 请确保不要意外删除错误的资源组或资源。Make sure that you don't accidentally delete the wrong resource group or resources. 如果在现有的包含要保留资源的资源组中创建了 IoT 中心,请只删除 IoT 中心资源本身,而不要删除资源组。If you created the IoT hub inside an existing resource group that has resources that you want to keep, delete only the IoT hub resource itself, instead of deleting the resource group.

若要删除资源,请执行以下操作:To delete the resources:

  1. 登录到 Azure 门户,然后选择“资源组”。 Sign in to the Azure portal and select Resource groups.

  2. 选择包含 IoT Edge 测试资源的资源组的名称。Select the name of the resource group that contains your IoT Edge test resources.

  3. 查看包含在资源组中的资源的列表。Review the list of resources contained in your resource group. 若要删除这一切,可以选择“删除资源组”。 If you want to delete all of them, you can select Delete resource group. 如果只需删除部分内容,可以单击要单独删除的每个资源。If you want to delete only some of them, you can click into each resource to delete them individually.

后续步骤Next steps

在本教程中,创建了 IoT Edge 模块,其中包含用于筛选 IoT Edge 设备生成的原始数据的代码。In this tutorial, you created an IoT Edge module that contains code to filter raw data generated by your IoT Edge device.

可以继续学习后续教程,了解如何借助 Azure IoT Edge 部署 Azure 云服务,在边缘位置处理和分析数据。You can continue on to the next tutorials to learn how Azure IoT Edge can help you deploy Azure cloud services to process and analyze data at the edge.