Queries the access credential of a device. If unique-certificate-per-device authentication is used as the authentication method on an ApsaraMQ for MQTT broker, an access credential that you apply for in advance is required for authentication when you connect your device to the broker. The connection can be established only after the authentication is passed.
Operation description
- You can call this operation up to 500 times per second per account. If the limit is exceeded, throttling is triggered. We recommend that you take note of this limit when you call this operation. For more information, see Limits on QPS.
- Each successful call to the GetDeviceCredential operation increases the messaging transactions per second (TPS) by one. This affects the billing of your instance. For more information, see Billing rules.
Debugging
Authorization information
Request parameters
Parameter | Type | Required | Description | Example |
---|---|---|---|---|
ClientId | string | Yes | The client ID of the device whose access credential you want to query. | GID_test@@@test |
InstanceId | string | Yes | The ID of the ApsaraMQ for MQTT instance. The ID must be consistent with the ID of the instance that the ApsaraMQ for MQTT client uses. You can obtain the instance ID on the Instance Details page that corresponds to the instance in the ApsaraMQ for MQTT console. | post-cn-0pp12gl**** |
Response parameters
Examples
Sample success responses
JSON
format
{
"RequestId": "E4581CCF-62AF-44D9-B5B4-D1DQDC0E****",
"DeviceCredential": {
"UpdateTime": 1605541382000,
"DeviceAccessKeyId": "DC.Z5fXh9sRRVufyLi6wo****",
"CreateTime": 1605541382000,
"InstanceId": "post-cn-0pp12gl****",
"DeviceAccessKeySecret": "DC.BJMkn4eMQJK2vaApTS****",
"ClientId": "GID_test@@@test"
}
}
Error codes
HTTP status code | Error code | Error message |
---|---|---|
400 | ApplyTokenOverFlow | You have applied for tokens too many times. Please try again later. |
400 | CheckAccountInfoFailed | An error occurred while checking the account information by the STS token. |
400 | InstancePermissionCheckFailed | An error occurred while validating the permissions of the instance. Please verify the account that created the instance and its permissions settings. |
400 | ParameterCheckFailed | An error occurred while validating the parameters. The parameters may be missing or invalid. |
400 | PermissionCheckFailed | An error occurred while validating the resource permissions. Please check the account that created the instance, topic, and GroupId, and check their permission settings. |
400 | InvalidParameter.%s | An error occurred while validating the parameter. The parameter may be missing or invalid. |
404 | ApiNotSupport | The specified API is not supported. |
500 | InternalError | An error occurred while processing your request. Try again later. |
500 | SystemOverFlow | An error occurred while processing your request. Please try again. |
For a list of error codes, visit the Service error codes.
Change history
Change time | Summary of changes | Operation |
---|---|---|
2024-04-25 | The Error code has changed | View Change Details |