Connect to a MQTT server

  1. Enter the MQTT server "URL" and click on "Connect".
  2. Check the log to see if the connection was successful or not.
  3. To test your server add messages under a topic and publish it.
  4. Other devices in the server that has subscribed to the topic will get your messages.
  5. You can receive messages by subscribing to a topic that another device in the server is transmits.
  6. Monitor the log for results.

Sending messages

Write your message in the Message input field under 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 "New Subscription" button to add a new subscription. Enter the topic name and click on "Subscribe" button to subscribe to the topic. The messages you receive will be displayed on the Logs pane.


  1. Make sure you entered valid MQTT URL, they always start with the protocol format ws://.
  2. Do not add invalid/incorrect authorization token before you connect to a MQTT server.


Learn more about MQTT.