Javascript 如何从Lambda将mqtt发布到AWS Shadow

这是我目前正在使用的代码

var AWS = require('aws-sdk');

var iotdata = new AWS.IotData({
  endpoint: '######.iot.ap-south-1.amazonaws.com'
});

exports.handler = async (event) => {


await new Promise((resolve, reject) => {
   var params = {
  payload: Buffer.from('...') || 'STRING_VALUE' , 
  
  thingName: 'ESP32', /* required */
  //shadowName: 'STRING_VALUE'
 };
  iotdata.updateThingShadow(params, function(err, data) {
      if (err) { 
         console.log(err, err.stack); 
         console.log("error................")// an error occurred
         reject(err);
      } else {
         console.log(data);           // successful response
         resolve(data)
      }
 });
})
}

关于这个我有两个问题,

我的密码好像有点错误。你能帮我纠正一下吗

我应该以何种格式给出有效负载。我不太明白缓冲区的类型

不知何故，当我运行代码时，会在执行结果中看到错误……。。（这是从控制台日志中看到的）

我在节点JS12.x环境中的AWS lambda中运行此代码。我已经给了lambda适当的权限将数据发布到阴影中

谢谢

这是错误消息

Response:
{
  "errorType": "InvalidRequestException",
  "errorMessage": "Payload contains invalid json",
  "trace": [
    "InvalidRequestException: Payload contains invalid json",
    "    at Object.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/json.js:51:27)",
    "    at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/rest_json.js:55:8)",
    "    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)",
    "    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)",
    "    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:688:14)",
    "    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)",
    "    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)",
    "    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10",
    "    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)",
    "    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:690:12)"
  ]
}

Request ID:
"2574b62-4b-41e7-a725-644e8d78"

Function logs:
START RequestId: 24574b62-4be3-41e7-a725-694a444e8d78 Version: $LATEST
2020-11-14T04:39:40.303Z    24574b62-4be3-41e7-a725-694a444e8d78    INFO    InvalidRequestException: Payload contains invalid json
    at Object.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/json.js:51:27)
    at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/rest_json.js:55:8)
    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:688:14)
    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)
    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)
    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:690:12) {
  code: 'InvalidRequestException',
  time: 2020-11-14T04:39:40.243Z,
  requestId: '219f8c5f-2bf1-9ad0-ff5d-589940833983',
  statusCode: 400,
  retryable: false,
  retryDelay: 68.01088760246567
} InvalidRequestException: Payload contains invalid json
    at Object.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/json.js:51:27)
    at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/rest_json.js:55:8)
    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)
    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:688:14)
    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)
    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)
    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)
    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:690:12)
2020-11-14T04:39:40.340Z    24574b62-4be3-41e7-a725-694a444e8d78    INFO    error................
2020-11-14T04:39:40.342Z    24574b62-4be3-41e7-a725-694a444e8d78    ERROR   Invoke Error    {"errorType":"InvalidRequestException","errorMessage":"Payload contains invalid json","code":"InvalidRequestException","message":"Payload contains invalid json","time":"2020-11-14T04:39:40.243Z","requestId":"219f8c5f-2bf1-9ad0-ff5d-589940833983","statusCode":400,"retryable":false,"retryDelay":68.01088760246567,"stack":["InvalidRequestException: Payload contains invalid json","    at Object.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/json.js:51:27)","    at Request.extractError (/var/runtime/node_modules/aws-sdk/lib/protocol/rest_json.js:55:8)","    at Request.callListeners (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:106:20)","    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/sequential_executor.js:78:10)","    at Request.emit (/var/runtime/node_modules/aws-sdk/lib/request.js:688:14)","    at Request.transition (/var/runtime/node_modules/aws-sdk/lib/request.js:22:10)","    at AcceptorStateMachine.runTo (/var/runtime/node_modules/aws-sdk/lib/state_machine.js:14:12)","    at /var/runtime/node_modules/aws-sdk/lib/state_machine.js:26:10","    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:38:9)","    at Request.<anonymous> (/var/runtime/node_modules/aws-sdk/lib/request.js:690:12)"]}
END RequestId: 24574b62-4be3-41e7-a725-694a444e8d78
REPORT RequestId: 24574b62-4be3-41e7-a725-694a444e8d78  Duration: 736.20 ms Billed Duration: 800 ms Memory Size: 128 MB Max Memory Used: 85 MB  Init Duration: 392.36 ms    

响应：
{
“errorType”：“InvalidRequestException”，
“errorMessage”：“负载包含无效的json”，
“跟踪”：[
“InvalidRequestException:有效负载包含无效的json”，
“at Object.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/json.js:51:27）”，
“at Request.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/rest_json.js:55:8）”，
“at Request.callListeners（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:106:20）”，
“at Request.emit（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:78:10）”，
“at Request.emit（/var/runtime/node_modules/aws sdk/lib/Request.js:688:14）”，
“at Request.transition（/var/runtime/node_modules/aws sdk/lib/Request.js:22:10）”，
“在AcceptorStateMachine.runTo（/var/runtime/node_modules/aws sdk/lib/state_machine.js:14:12）”中，
“at/var/runtime/node_modules/aws sdk/lib/state_machine.js:26:10”，
“应请求。（/var/runtime/node_modules/aws sdk/lib/Request.js:38:9）”，
“应请求。（/var/runtime/node_modules/aws sdk/lib/Request.js:690:12）”
]
}
请求ID:
“2574b62-4b-41e7-a725-644e8d78”
功能日志：
启动请求ID:24574b62-4be3-41e7-a725-694a444e8d78版本：$LATEST
2020-11-14T04:39:40.303Z 24574b62-4be3-41e7-a725-694a444e8d78信息无效请求异常：有效负载包含无效json
在Object.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/json.js:51:27）
at Request.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/rest_json.js:55:8）
at Request.callListeners（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:106:20）
at Request.emit（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:78:10）
at Request.emit（/var/runtime/node_modules/aws sdk/lib/Request.js:688:14）
at Request.transition（/var/runtime/node_modules/aws sdk/lib/Request.js:22:10）
在AcceptorStateMachine.runTo（/var/runtime/node_modules/aws sdk/lib/state_machine.js:14:12）
at/var/runtime/node_modules/aws sdk/lib/state_machine.js:26:10
应要求。（/var/runtime/node_modules/aws sdk/lib/request.js:38:9）
应要求。（/var/runtime/node_modules/aws sdk/lib/request.js:690:12）{
代码：“InvalidRequestException”，
时间：2020-11-14T04:39:40.243Z，
请求ID:'219f8c5f-2bf1-9ad0-ff5d-589940833983'，
状态代码：400，
可检索：错误，
retryDelay:68.01088760246567
}InvalidRequestException:负载包含无效的json
在Object.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/json.js:51:27）
at Request.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/rest_json.js:55:8）
at Request.callListeners（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:106:20）
at Request.emit（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:78:10）
at Request.emit（/var/runtime/node_modules/aws sdk/lib/Request.js:688:14）
at Request.transition（/var/runtime/node_modules/aws sdk/lib/Request.js:22:10）
在AcceptorStateMachine.runTo（/var/runtime/node_modules/aws sdk/lib/state_machine.js:14:12）
at/var/runtime/node_modules/aws sdk/lib/state_machine.js:26:10
应要求。（/var/runtime/node_modules/aws sdk/lib/request.js:38:9）
应要求。（/var/runtime/node_modules/aws sdk/lib/request.js:690:12）
2020-11-14T04:39:40.340Z 24574b62-4be3-41e7-a725-694a444e8d78信息错误。。。。。。。。。。。。。。。。
2020-11-14T04:39:40.342Z 24574b62-4be3-41e7-a725-694a444e8d78错误调用错误{“errorType”：“InvalidRequestException”，“errorMessage”：“有效负载包含无效json”，“代码”：“InvalidRequestException”，“message”：“有效负载包含无效json”，“时间”：“2020-11-14T04:39:40.243Z”，“requestId”：“219f8c5f-2bf1-9ad0-ff5d-58994083983”，“状态代码”：400，“retryable”：false，“retryDelay”：68.01088760246567，“堆栈”：[“InvalidRequestException:有效负载包含无效json”，“at Object.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/json.js:51:27）”，“at Request.extractError（/var/runtime/node_modules/aws sdk/lib/protocol/rest_json.js:55:8）”，“at Request.callListeners（/var/runtime/node_modules/aws sdk/lib/sequential_executor.js:106:20）”，“at Request.emit（/var/runtime/node_modules/aws sdk/lib/node_executor.js:78:10）”，“at Request.transition（/var/runtime/node_modules/aws sdk/lib/Request.js:22:10）”，“at Request，“at-AcceptorStateMachine.runTo（/var/runtime/node_modules/aws sdk/lib/state_machine.js:14:12）”，“at/var/runtime/node_modules/aws sdk/lib/Request.js:38:9）”，“at-Request（/var/runtime/node_modules/aws sdk/lib/Request.js:690:12）”]
结束请求ID:24574b62-4be3-41e7-a725-694a444e8d78
报告请求ID:24574b62-4be3-41e7-a725-694a444e8d78持续时间：736.20毫秒计费持续时间：800毫秒内存大小：128 MB最大使用内存：85 MB初始持续时间：392.36毫秒

我找到了这个问题的答案

问题出在有效载荷上。 这将是正确的代码

var AWS = require('aws-sdk');

var iotdata = new AWS.IotData({
  endpoint: '#######.iot.ap-south-1.amazonaws.com'
});

exports.handler = async (event) => {

var POST_DATA = JSON.stringify({"state":{"desired":{"state":10}}});
await new Promise((resolve, reject) => {
   var params = {
  payload:POST_DATA , 
  
  thingName: 'ESP32', /* required */
  //shadowName: 'STRING_VALUE'
 };
  iotdata.updateThingShadow(params, function(err, data) {
      if (err) { 
         console.log(err, err.stack); 
         console.log("error................")// an error occurred
         reject(err);
      } else {
         console.log(data);           // successful response
         resolve(data)
      }
 });
})

}

---

错误消息到底是什么？@Marcin我已经编辑了我的问题。很抱歉。我认为错误消息很清楚：“负载包含无效的json”。您的负载的形式是什么？@Marcin我希望这样