Write your message in the “Message” input field under the “Communication” tab and click on the “Publish” button. Type in the “Topic” input field to send a message with a topic. The message you send will be displayed on the “Logs” pane.
Click on the “New Subscription” button to add a new subscription. Enter the topic name and click on the “Subscribe” button to subscribe to the topic. The messages you receive will be displayed on the “Logs” pane.