Publishing a JSON Message Using SMN

Scenarios

You can publish a JSON message to an SMN topic to broadcast the message to different types of subscription endpoints in the topic.

To start your experience with SMN, this topic describes how to create a topic and publish a JSON message.

Operation Process

Procedure	Description
Making Preparations	Sign up for a HUAWEI ID, complete real-name authentication, enable Huawei Cloud services, and top up your account.
Step 1: Create a Topic	Create a topic Mytopic.
Step 2: Add a Subscription	Add SMS and email subscriptions to the topic.
Step 3: Publish a Message	Publish a message "Dear Sir or Madam, this is an SMS message." to the SMS subscriber. Publish a message "Dear Sir or Madam, this is an Email message." to the email subscriber.
Step 4: Receive the Message	The subscription endpoints receive the messages.

Making Preparations

Sign up for Huawei Cloud and complete real-name authentication.
Before using SMN, sign up for a HUAWEI ID, enable Huawei Cloud services, and complete real-name authentication.

If you have enabled Huawei Cloud services and completed real-name authentication, skip this step.
Top up your account.
Ensure that the account balance is sufficient. If not, top up your account.

Step 1: Create a Topic

Configure topic parameters.

In this example, only some parameters are described. Retain the default values for other parameters. For details about the parameters, see Creating a Topic.

Figure 1 Create Topic

**Table 1** Parameters for creating a topic
Parameter	Example Value	Description
Topic Name	Mytopic	Specifies the name of the topic to be created.
Enterprise Project	default	This parameter is displayed only for enterprise users who have enabled enterprise project management.

Click OK.
After a topic is created, the system generates a topic URN, which uniquely identifies the topic and cannot be changed. The topic you created is displayed in the topic list.

Step 2: Add a Subscription

Add SMS and email subscriptions to the topic.

In the topic list, locate Mytopic and click Add Subscription in the Operation column.

Configure subscription parameters.

In this example, only some parameters are described. Retain the default values for other parameters. For details about the parameters, see Creating a Topic.

Figure 2 Add Subscription

**Table 2** Parameters for adding an SMS subscription
Parameter	Example Value	Description
Topic Name	Mytopic	Specifies the name of the topic you select to add subscriptions.
Protocol	SMS	Select SMS from the Protocol drop-down list. For more supported protocols, see What Protocols Does SMN Support?
Endpoint	+8618612345678	Enter a valid mobile number in the text box. You can enter up to 10 endpoints, each on a separate line. SMN does not check whether subscription endpoints exist when you add subscriptions.

Click OK.
After a subscription is added, the subscription endpoint receives a confirmation message. The recipient needs to click the subscription confirmation link on the subscription endpoint to confirm that they agree to receive messages published to the topic. On the SMN console, you can see that the subscription status is Confirmed.

In the topic list, locate Mytopic and click Add Subscription in the Operation column.

Configure subscription parameters.

In this example, only some parameters are described. Retain the default values for other parameters. For details about the parameters, see Creating a Topic.

Figure 3 Add Subscription

**Table 3** Parameters for adding an email subscription
Parameter	Example Value	Description
Topic Name	Mytopic	Specifies the name of the topic you select to add subscriptions.
Protocol	Email	Select Email from the Protocol drop-down list. For more supported protocols, see What Protocols Does SMN Support?
Endpoint	username@example.com	Enter a valid email address in the text box. You can enter up to 10 endpoints, each on a separate line. SMN does not check whether subscription endpoints exist when you add subscriptions.

Click OK.
After a subscription is added, the subscription endpoint receives a confirmation message. The recipient needs to click the subscription confirmation link on the subscription endpoint to confirm that they agree to receive messages published to the topic. On the SMN console, you can see that the subscription status is Confirmed.

Step 3: Publish a Message

In the topic list, locate Mytopic and click Publish Message in the Operation column.

Configure parameters for publishing a message.

In this example, only some parameters are described. Retain the default values for other parameters. For details about the parameters, see Publishing a JSON Message.

Figure 4 Publish Message

**Table 4** Parameters for publishing a message
Parameter	Example Value	Description
Topic Name	Mytopic	Specifies the name of the topic you select to publish a message.
Message Format	JSON	Specifies in which format messages will be sent.
Message	{ "default": "Dear Sir or Madam, this is a default message.", "sms": "Dear Sir or Madam, this is an SMS message.", "email": "Dear Sir or Madam, this is an Email message." }	You can manually enter a message in JSON format or click Generate JSON Message to automatically generate a message. For details, see JSON Message Format.