本文介绍：

将IoT Hub Service SDK 调用Direct Method 封装为Azure Functions Http Trigger(C#)

 

 

视频介绍：

图文介绍：

本文内容比较简单，不做图文介绍了，直接创建functions，采用http 触发，添加如下代码，发布后即可通过调用http请求的方式，向iot hub 发送 direct method 调用。

注意：

1.引用包：using Microsoft.Azure.Devices;

2.本例调用的客户端案例为\azure-iot-samples-node-master\iot-hub\Quickstarts\simulated-device-2

3. 其中iot hub 连接字符串写入functions 配置文件，deviceid 和payload 通过query string 传递

例如，http://localhost:7071/api/CallDierctMethod?deviceId=device-0001&payload=10

表示将名称为device-0001的设备的上报数据频率改为10秒

 

 

using System;
using System.IO;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Azure.WebJobs;
using Microsoft.Azure.WebJobs.Extensions.Http;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json;
using Microsoft.Azure.Devices;

namespace Company.Function
{
public static class CallDierctMethod
    {

private static ServiceClient s_serviceClient;


// The function will called like :
// http://localhost:7071/api/CallDierctMethod?deviceId=device-0001&payload=1

        [FunctionName("CallDierctMethod")]
public static async Task<IActionResult> Run(
            [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = null)] HttpRequest req,
            ILogger log)
        {
            log.LogInformation("C# HTTP trigger function processed a request.");         



string deviceId = req.Query["deviceId"];

string payload = req.Query["payload"];

             log.LogInformation($"parameter deviceId:{deviceId},payload:{payload}");

string s_connectionString = System.Environment.GetEnvironmentVariable("IoTHubConnectionString");

            s_serviceClient = ServiceClient.CreateFromConnectionString(s_connectionString);
var cloudToDeviceMethodResult= InvokeMethod(deviceId,payload).GetAwaiter().GetResult();

             log.LogInformation($"Functions Result:{cloudToDeviceMethodResult.GetPayloadAsJson()}");

return new OkObjectResult(cloudToDeviceMethodResult);
        }



private static  async Task<CloudToDeviceMethodResult> InvokeMethod(string deviceId,string  payload)
        {
var methodInvocation = new CloudToDeviceMethod("SetTelemetryInterval") { ResponseTimeout = TimeSpan.FromSeconds(30) };
            methodInvocation.SetPayloadJson(payload);

// Invoke the direct method asynchronously and get the response from the simulated device.
var response =  await s_serviceClient.InvokeDeviceMethodAsync(deviceId, methodInvocation);

return response;


        }
    }
}

 

{
"IsEncrypted": false,
"Values": {
"AzureWebJobsStorage": "",
"FUNCTIONS_WORKER_RUNTIME": "dotnet",

"IoTHubConnectionString":"{your iot hub connection string}"
  }
}


（4.1）-将Azure IoT Service SDK 集成到 Azure Function并发布_经验分享