查询设备属性
功能介绍
设备的产品模型中定义了物联网平台可向设备下发的属性,应用服务器可调用此接口向设备发送指令用以查询设备的实时属性, 并由设备将属性查询的结果同步返回给应用服务器。 注意:此接口适用于MQTT设备,暂不支持NB-IoT设备。
调用方法
请参见如何调用API。
URI
GET /v5/iot/{project_id}/devices/{device_id}/properties
参数 |
是否必选 |
参数类型 |
描述 |
---|---|---|---|
device_id |
是 |
String |
参数说明:下发属性的设备ID,用于唯一标识一个设备,在注册设备时由物联网平台分配获得。 取值范围:长度不超过128,只允许字母、数字、下划线(_)、连接符(-)的组合。 |
project_id |
是 |
String |
参数说明:项目ID。获取方法请参见 获取项目ID 。 |
参数 |
是否必选 |
参数类型 |
描述 |
---|---|---|---|
service_id |
是 |
String |
参数说明:设备的服务ID,在设备关联的产品模型中定义。 |
请求参数
参数 |
是否必选 |
参数类型 |
描述 |
---|---|---|---|
X-Auth-Token |
否 |
String |
参数说明:用户Token。通过调用IAM服务 获取IAM用户Token接口获取,接口返回的响应消息头中“X-Subject-Token”就是需要获取的用户Token。简要的获取方法样例请参见 Token认证。 |
Instance-Id |
否 |
String |
参数说明:实例ID。物理多租下各实例的唯一标识,建议携带该参数,在使用专业版时必须携带该参数。您可以在IoTDA管理控制台界面,选择左侧导航栏“总览”页签查看当前实例的ID,具体获取方式请参考查看实例详情 。 |
响应参数
状态码: 200
参数 |
参数类型 |
描述 |
---|---|---|
request_id |
String |
设备属性查询ID,用于唯一标识一条属性查询,在下发查询属性时由物联网平台分配获得。 |
response |
Object |
设备上报的属性执行结果。Json格式,具体格式需要应用和设备约定。 |
error_code |
String |
属性查询异常错误码。 |
error_msg |
String |
属性查询异常错误信息。 |
请求示例
查询设备属性,查询指定设备的服务为Temperature的所有属性。
GET https://{endpoint}/v5/iot/{project_id}/devices/{device_id}/properties?service_id=Temperature
响应示例
状态码: 200
OK
{ "request_id" : "b1224afb-e9f0-4916-8220-b6bab568e888", "response" : { "services" : { "serviceId" : "Temperature", "properties" : { "PhV_phsA" : "1", "PhV_phsB" : "2" }, "eventTime" : "20190606T121212Z" } } }
SDK代码示例
SDK代码示例如下。
Java
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package com.huaweicloud.sdk.test; import com.huaweicloud.sdk.core.auth.ICredential; import com.huaweicloud.sdk.core.auth.AbstractCredentials; import com.huaweicloud.sdk.core.auth.BasicCredentials; import com.huaweicloud.sdk.core.exception.ConnectionException; import com.huaweicloud.sdk.core.exception.RequestTimeoutException; import com.huaweicloud.sdk.core.exception.ServiceResponseException; import com.huaweicloud.sdk.iotda.v5.region.IoTDARegion; import com.huaweicloud.sdk.iotda.v5.*; import com.huaweicloud.sdk.iotda.v5.model.*; public class ListPropertiesSolution { public static void main(String[] args) { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment String ak = System.getenv("CLOUD_SDK_AK"); String sk = System.getenv("CLOUD_SDK_SK"); ICredential auth = new BasicCredentials() .withDerivedPredicate(AbstractCredentials.DEFAULT_DERIVED_PREDICATE) // Used in derivative ak/sk authentication scenarios .withAk(ak) .withSk(sk); IoTDAClient client = IoTDAClient.newBuilder() .withCredential(auth) .withRegion(IoTDARegion.valueOf("<YOUR REGION>")) .build(); ListPropertiesRequest request = new ListPropertiesRequest(); request.withServiceId("<service_id>"); try { ListPropertiesResponse response = client.listProperties(request); System.out.println(response.toString()); } catch (ConnectionException e) { e.printStackTrace(); } catch (RequestTimeoutException e) { e.printStackTrace(); } catch (ServiceResponseException e) { e.printStackTrace(); System.out.println(e.getHttpStatusCode()); System.out.println(e.getRequestId()); System.out.println(e.getErrorCode()); System.out.println(e.getErrorMsg()); } } } |
Python
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# coding: utf-8 from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkcore.auth.credentials import DerivedCredentials from huaweicloudsdkiotda.v5.region.iotda_region import IoTDARegion from huaweicloudsdkcore.exceptions import exceptions from huaweicloudsdkiotda.v5 import * if __name__ == "__main__": # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak = __import__('os').getenv("CLOUD_SDK_AK") sk = __import__('os').getenv("CLOUD_SDK_SK") credentials = BasicCredentials(ak, sk) \ .with_derived_predicate(DerivedCredentials.get_default_derived_predicate()) \ client = IoTDAClient.new_builder() \ .with_credentials(credentials) \ .with_region(IoTDARegion.value_of("<YOUR REGION>")) \ .build() try: request = ListPropertiesRequest() request.service_id = "<service_id>" response = client.list_properties(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg) |
Go
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package main import ( "fmt" "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic" iotda "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/iotda/v5" "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/iotda/v5/model" region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/iotda/v5/region" core_auth "github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth" ) func main() { // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security. // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment ak := os.Getenv("CLOUD_SDK_AK") sk := os.Getenv("CLOUD_SDK_SK") auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithDerivedPredicate(core_auth.GetDefaultDerivedPredicate()). // Used in derivative ak/sk authentication scenarios Build() client := iotda.NewIoTDAClient( iotda.IoTDAClientBuilder(). WithRegion(region.ValueOf("<YOUR REGION>")). WithCredential(auth). Build()) request := &model.ListPropertiesRequest{} request.ServiceId = "<service_id>" response, err := client.ListProperties(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } } |
更多
更多编程语言的SDK代码示例,请参见API Explorer的代码示例页签,可生成自动对应的SDK代码示例。
状态码
状态码 |
描述 |
---|---|
200 |
OK |
400 |
Bad Request |
403 |
Forbidden |
404 |
Not Found |
500 |
Internal Server Error |
503 |
Service Unavailable |
错误码
请参见错误码。