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In this video we are going to publish message to the topic on Amazon since using database libraries.

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So we will perform the second use case publishing message in Amazon SANS and we will use the publish

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message command to the Amazon since we are using the Node.js application and SDK libraries.

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So basically when publishing the message, it is send a message to Amazon sans topic or it is a text

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message directly to the phone number or a message to the mobile platform and points it is depending

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on which system are subscribing.

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If we send a message to the topic, Amazon SMS delivers the message to each end point that is subscribed

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to the topic, the format of the message depending on the notification protocol for each subscribed

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endpoints.

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So let's start the implementation.

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Before we start, we should check the documentation.

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You can come to this client and search for the.

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Publish.

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Come on.

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You can see in here if you open the publish command, you can see the documentation in here.

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Basically, we will use the publish command operation to perform these tasks.

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If you go to input statement, you can see the potential input statement.

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When we are sending any message to the topic, it requires the subject message, phone number, topic,

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agent and so on.

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But the idea is that publish command is provided to send a message to Amazon sans topic.

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And if you send the SNS topic, Amazon SNS will be redirect this message to the subscribe systems.

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Okay, before we proceed to publish command, we should create a topic on Amazon SNS environment.

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For that purpose we have already used an implement create topic so we don't have any topic now to create

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a new topic.

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So I'm going to run not command which is not create topic that just hit enter.

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This will be create a new topic on the Amazon SNS.

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So after that we will implement our actual logic, which is the published command to this new topic.

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For that purpose, I'm going to create a new file, which is the publish.

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Beaumont.

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But this topic.

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But this.

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So in this file we are going to implement our actual logic.

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To do so.

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I'm going to copy from the create topic and come here, which is pasting the whole code.

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But this time we are going to use the command of the published command, right?

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So we can see documentation in the publish command.

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We should specify some different parameters which including the our message and the topic area.

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So let me give a topic and you can remember that when we delete a topic, we pass the topic and copy

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this parameter from here and come back to our actual logic, which is the publish topic.

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So a paste the topic, a run in here.

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Also we have another parameter which is the message.

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In the message.

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We can give the some example.

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Publish a month message.

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You can give any message in here.

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Okay, very good.

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We specify the parameters for the publish command and we are going to send these publish commands with

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these parameters to the SNS client and the rest of the code is will be same.

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Okay.

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Very good.

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To test this code, we can save this file and open the terminal.

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Run the node, publish command to JS, hit enter.

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This is going to publish a message to the topic that we create.

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Okay.

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As you can see that the message ID is returned to us.

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So we will verify from the message the Amazon SNS topic.

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If you go to the our environment, go to topics.

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If you refresh this page.

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You can see the topics that we created and if you open the topic, you can see that we send the topic

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message, we got the topic message ID, but since we don't have any subscriber, we didn't see the message

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from the subscriber systems.

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So as you can see that we have successfully publish message to the topic on Amazon since using a disk

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libraries.

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In the next video we will subscribe and unsubscribe from the topic on Amazon since.