查询设备消息
功能介绍
应用服务器可调用此接口查询平台下发给设备的消息,平台为每个设备默认最多保存20条消息,超过20条后, 后续的消息会替换下发最早的消息。
调用方法
请参见如何调用API。
URI
GET /v5/iot/{project_id}/devices/{device_id}/messages
参数 |
是否必选 |
参数类型 |
描述 |
---|---|---|---|
project_id |
是 |
String |
参数说明:项目ID。获取方法请参见 获取项目ID 。 |
device_id |
是 |
String |
参数说明:下发消息的设备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。 |
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 |
---|---|---|
device_id |
String |
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。 |
messages |
Array of DeviceMessage objects |
设备消息列表。 |
参数 |
参数类型 |
描述 |
---|---|---|
message_id |
String |
设备消息ID,用于唯一标识一条消息,在下发设备消息时由物联网平台分配获得。 |
name |
String |
消息名称,在下发消息时由用户指定。 |
message |
Object |
消息内容。 |
encoding |
String |
消息内容编码格式,取值范围none|base64,默认值none, base64格式仅支持透传。 |
payload_format |
String |
有效负载格式,在消息内容编码格式为none时有效,取值范围standard|raw,默认值standard(平台封装的标准格式),取值为raw时直接将消息内容作为有效负载下发。 |
topic |
String |
消息topic |
properties |
PropertiesDTO object |
消息下行到设备的属性参数。 |
status |
String |
消息状态,包含PENDING,DELIVERED,FAILED和TIMEOUT,PENDING指设备不在线,消息被缓存起来,等设备上线之后下发; DELIVERED指消息发送成功;FAILED消息发送失败;TIMEOUT指消息在平台默认时间内(1天)还没有下发送给设备,则平台会将消息设置为超时,状态为TIMEOUT。 |
error_info |
ErrorInfoDTO object |
消息下发失败信息。 |
created_time |
String |
消息的创建时间,"yyyyMMdd'T'HHmmss'Z'"格式的UTC字符串。 |
finished_time |
String |
消息结束时间, "yyyyMMdd'T'HHmmss'Z'"格式的UTC字符串,包含消息转换到DELIVERED和TIMEOUT两个状态的时间。 |
参数 |
参数类型 |
描述 |
---|---|---|
correlation_data |
String |
参数说明:MQTT 5.0版本请求和响应模式中的相关数据,可选。用户可以通过该参数配置MQTT协议请求和响应模式中的相关数据。 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。 |
response_topic |
String |
参数说明:MQTT 5.0版本请求和响应模式中的响应主题,可选。用户可以通过该参数配置MQTT协议请求和响应模式中的响应主题。 取值范围:长度不超过128, 只允许字母、数字、以及_-?=$#+/等字符的组合。 |
user_properties |
Array of UserPropDTO objects |
参数说明:用户自定义属性,可选。用户可以通过该参数配置用户自定义属性。可以配置的最大自定义属性数量为20。 |
请求示例
列表查询所有消息。
GET https://{endpoint}/v5/iot/{project_id}/devices/{device_id}/messages
响应示例
状态码: 200
OK
{ "device_id" : "d4922d8a-6c8e-4396-852c-164aefa6638f", "messages" : [ { "message_id" : "b1224afb-e9f0-4916-8220-b6bab568e888", "name" : "message_name", "message" : "string", "encoding" : "none", "payload_format" : "raw", "topic" : "string", "properties" : { "correlation_data" : "string", "response_topic" : "string", "user_properties" : [ { "prop_key" : "string", "prop_value" : "string" } ] }, "status" : "PENDING", "error_info" : { "error_code" : "string", "error_msg" : "string" }, "created_time" : "20151212T121212Z", "finished_time" : "20151212T121212Z" } ] }
SDK代码示例
SDK代码示例如下。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 |
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.core.region.Region; import com.huaweicloud.sdk.iotda.v5.*; import com.huaweicloud.sdk.iotda.v5.model.*; public class ListDeviceMessagesSolution { 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"); // ENDPOINT:请在控制台的"总览"界面的"平台接入地址"中查看“应用侧”的https接入地址。 String iotdaEndpoint = "<YOUR ENDPOINT>"; String projectId = "{project_id}"; ICredential auth = new BasicCredentials() .withProjectId(projectId) // 标准版/企业版需要使用衍生算法,基础版请删除配置"withDerivedPredicate"; .withDerivedPredicate(AbstractCredentials.DEFAULT_DERIVED_PREDICATE) // Used in derivative ak/sk authentication scenarios .withAk(ak) .withSk(sk); IoTDAClient client = IoTDAClient.newBuilder() .withCredential(auth) // 标准版/企业版:需自行创建Region对象,基础版:请使用IoTDARegion的region对象,如"withRegion(IoTDARegion.CN_NORTH_4)" .withRegion(new Region("cn-north-4", iotdaEndpoint)) .build(); ListDeviceMessagesRequest request = new ListDeviceMessagesRequest(); request.withDeviceId("{device_id}"); try { ListDeviceMessagesResponse response = client.listDeviceMessages(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()); } } } |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 |
# coding: utf-8 import os from huaweicloudsdkcore.auth.credentials import BasicCredentials from huaweicloudsdkcore.auth.credentials import DerivedCredentials from huaweicloudsdkcore.region.region import Region as coreRegion 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 = os.environ["CLOUD_SDK_AK"] sk = os.environ["CLOUD_SDK_SK"] // ENDPOINT:请在控制台的"总览"界面的"平台接入地址"中查看“应用侧”的https接入地址。 iotdaEndpoint = "<YOUR ENDPOINT>"; projectId = "{project_id}" credentials = BasicCredentials(ak, sk, projectId).with_derived_predicate(DerivedCredentials.get_default_derived_predicate()) client = IoTDAClient.new_builder() \ .with_credentials(credentials) \ # 标准版/企业版:需要使用自行创建的Region对象,基础版:请选择IoTDAClient中的Region对象 如: .with_region(IoTDARegion.CN_NORTH_4) .with_region(coreRegion(id="cn-north-4", endpoint=endpoint)) \ .build() try: request = ListDeviceMessagesRequest() request.device_id = "{device_id}" response = client.list_device_messages(request) print(response) except exceptions.ClientRequestException as e: print(e.status_code) print(e.request_id) print(e.error_code) print(e.error_msg) |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 |
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/core/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") // endpoint:请在控制台的"总览"界面的"平台接入地址"中查看"应用侧"的https接入地址 endpoint := "<YOUR ENDPOINT>" projectId := "{project_id}" auth := basic.NewCredentialsBuilder(). WithAk(ak). WithSk(sk). WithProjectId(projectId). // 企业版/标准版需要使用衍生算法,基础版请删除该配置"WithDerivedPredicate" WithDerivedPredicate(core_auth.GetDefaultDerivedPredicate()). // Used in derivative ak/sk authentication scenarios Build() client := iotda.NewIoTDAClient( iotda.IoTDAClientBuilder(). // 标准版/企业版需要自行创建region,基础版使用IoTDARegion中的region对象 WithRegion(region.NewRegion("cn-north-4", endpoint)). WithCredential(auth). Build()) request := &model.ListDeviceMessagesRequest{} request.DeviceId = "{device_id}" response, err := client.ListDeviceMessages(request) if err == nil { fmt.Printf("%+v\n", response) } else { fmt.Println(err) } } |
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 |
401 |
Unauthorized |
403 |
Forbidden |
404 |
Not Found |
500 |
Internal Server Error |
错误码
请参见错误码。