`无效的直接方法参数：[object Object]`当使用`az iot hub invoke-device-method`时 [英] `Invalid direct method parameter: [object Object]` when using `az iot hub invoke-device-method`

问题描述

我使用node.js教程成功设置了一个sim设备和后端控制器：https：//docs.microsoft.com/en-us/azure/iot-hub/quickstart-control-device -node

但是，如果我尝试使用带有`--method-payload`标志的`az iot hub invoke-device-method`，我会收到如下错误。

 $ az iot hub invoke-device-method --hub-name< my-hub> --device-id< my-dev> --method-name SetTelemetryInterval --method-payload params.json 
 {
" payload"：" Invalid direct method parameter：[object Object]"，
" status" ：400 
} 

with params.json：

 {
" payload"：2 

和来自$ node SimulatedDevice.js的错误：

收到的直接方法有效负载：
 [object Object] 
有效负载中收到的无效区间响应
成功发送方法'SetTelemetryInterval'的响应。

只是一个决赛请注意，我在设备中创建了一个不需要有效负载的新方法，并且已收到并回复确定。

解决方案

您好，

你是如何发送有效载荷的？我相信你应该序列化并将其作为字符串发送。以下是c＃中将类序列化为JSON的代码， https://www.newtonsoft.com/json/ help / html / SerializingJSON.htm

I've successfully set up a sim device and backend controller using the node.js tutorial: https://docs.microsoft.com/en-us/azure/iot-hub/quickstart-control-device-node

However, if I try to use `az iot hub invoke-device-method`with the `--method-payload` flag, I am getting errors as below.

$ az iot hub invoke-device-method --hub-name <my-hub> --device-id <my-dev> --method-name SetTelemetryInterval --method-payload params.json 
{
  "payload": "Invalid direct method parameter: [object Object]",
  "status": 400
}

with params.json:

{
  "payload": 2

and error from $node SimulatedDevice.js:

Direct method payload received:
[object Object]
Invalid interval response received in payload
Response to method 'SetTelemetryInterval' sent successfully.

Just a final note, I've created a new method in the device that does not require a payload, and it's received and replies OK.

解决方案

Hello,

How are you sending the payload? I believe you should serialize and send it as string. Here is a code to Serialize class to JSON in c# https://www.newtonsoft.com/json/help/html/SerializingJSON.htm

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