Creating a Subscription Management Task

Function

This API is used to create device operations under an application in a specified instance and subscribe to the specified topic.

URI

POST /v2/{project_id}/link/instances/{instance_id}/notifications

**Table 1** Path Parameters
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID. For details about how to obtain the project ID, see Appendix > Obtaining a Project ID in the ROMA Connect API Reference. Minimum: 0 Maximum: 32
instance_id	Yes	String	Instance ID. Minimum: 0 Maximum: 36

Request Parameters

**Table 2** Request header parameters
Parameter	Mandatory	Type	Description
X-Auth-Token	Yes	String	User token, which can be obtained by calling the IAM API (value of X-Subject-Token in the response header). Minimum: 1 Maximum: 100000

**Table 3** Request body parameters
Parameter	Mandatory	Type	Description
app_id	Yes	String	ID of the app to which a notification belongs. Minimum: 0 Maximum: 36
type	Yes	Integer	Notification type. The options include 0 (device online), 1 (device offline), 2 (device addition), 3 (device deletion), and 4 (device change). Minimum: 0 Maximum: 10
notification_dest	No	String	Destination type. Options: MQS: The destination is MQS in the current ROMA instance. MRSKAFKA: The destination is MRS Kafka data source in the current ROMA instance. THIRD_KAFKA: The destination is Kafka data source in the current ROMA instance. This parameter is mandatory for instance-level notification subscription. Minimum: 0 Maximum: 10
destination_app_id	No	String	Application ID to which the destination belongs. If this parameter is empty, the value is the same as that of app_id. This parameter is mandatory for instance-level notification subscription. Minimum: 0 Maximum: 36
destination_name	No	String	Data source name at the destination. If destination_type is 1, 2, or 3, the value is the name of the KAFKA data source. This parameter is mandatory for instance-level notification subscription. Minimum: 0 Maximum: 64
topic	Yes	String	Name of the topic to which a notification is sent. The topic must exist in MQS. Minimum: 0 Maximum: 64
status	Yes	Integer	Start/Stop status. The options include 0 (enabled) and 1 (disabled). Minimum: 0 Maximum: 10

Response Parameters

Status code: 200

**Table 4** Response body parameters
Parameter	Type	Description
notification_id	Integer	Subscription ID. Minimum: 0 Maximum: 100
type	Integer	Subscription type. The options include 0 (device online), 1 (device offline), 2 (device addition), 3 (device deletion), and 4 (device change). Minimum: 0 Maximum: 4
status	Integer	Subscription management status. The options include 0 (enabled) and 1 (disabled). Minimum: 0 Maximum: 1
topic	String	Name of the subscribed topic. Minimum: 3 Maximum: 200
instance_id	String	Instance ID. Minimum: 0 Maximum: 20
app_id	String	Application ID. Minimum: 0 Maximum: 64
destination_type	String	Destination type. Options: MQS: The destination is MQS in the current ROMA instance. MRSKAFKA: The destination is MRS Kafka data source in the current ROMA instance. THIRD_KAFKA: The destination is Kafka data source in the current ROMA instance. Minimum: 0 Maximum: 10
destination_app_id	String	Application ID to which the destination belongs. If this parameter is empty, the value is the same as that of app_id. Minimum: 0 Maximum: 36
destination_name	String	Data source name at the destination. If destination_type is 1, 2, or 3, the value is the name of the KAFKA data source. Minimum: 0 Maximum: 64

Status code: 400

**Table 5** Response body parameters
Parameter	Type	Description
error_code	String	System error code, which is the detailed error code of HTTP error codes 4xx and 5xx. Minimum: 0 Maximum: 64
error_msg	String	Error description. Minimum: 0 Maximum: 200
request_id	String	Message ID. Minimum: 0 Maximum: 64

Status code: 404

**Table 6** Response body parameters
Parameter	Type	Description
error_code	String	System error code, which is the detailed error code of HTTP error codes 4xx and 5xx. Minimum: 0 Maximum: 64
error_msg	String	Error description. Minimum: 0 Maximum: 200
request_id	String	Message ID. Minimum: 0 Maximum: 64

Status code: 500

**Table 7** Response body parameters
Parameter	Type	Description
error_code	String	System error code, which is the detailed error code of HTTP error codes 4xx and 5xx. Minimum: 0 Maximum: 64
error_msg	String	Error description. Minimum: 0 Maximum: 200
request_id	String	Message ID. Minimum: 0 Maximum: 64

Example Requests

{
  "app_id" : "ef3845be-091a-4ab5-869a-9de0025e2165",
  "type" : 0,
  "topic" : "online",
  "status" : 0
}

Example Responses

Status code: 200

Created

{
  "notification_id" : 100,
  "type" : 0,
  "status" : 0,
  "topic" : "string",
  "instance_id" : "string",
  "app_id" : "string"
}

Status code: 404

Not Found

{
  "error_code" : "ROMA.00110006",
  "error_msg" : "The resource does not exist. Check whether the resource ID 1 is correct.",
  "request_id" : "624c8be1-39b6-47b7-941d-c159aced368a-1619602544650-cnnorth7a-P-romalink-service01"
}