Getting Started With EMQX 

Let’s see how to download, install, and deploy EMQX, a popular open source MQTT broker. This broker provides the following capabilities:

• Support for MQTT 3.1.0, MQTT 3.1.1, and MQTT 5.0, including MQTT-SN

• Failover-ready with masterless clustering

• High concurrency with reduced latency

• Expandable gateways and plugins

• HTTP API-driven data integration

You can download EMQX here.

Installing EMQX

You can install EMQX using Docker, EMQX Kubernetes Operator, or install it directly on a physical or virtual machine using a downloadable package. The package supports all popular operating systems including Windows, Linux, macOS, RockyLinux, Ubuntu, and RedHat.

Probably the easiest method to install EMQX is via Docker. Enter the following command in your terminal to download and start the latest version of EMQX. Make sure Docker is installed and running:

docker run -d --name emqx -p 1883:1883 -p 8083:8083 -p 8084:8084 -p 8883:8883 -p 18083:18083 emqx/emqx:latest

Next, open your web browser and type: 

http://localhost:18083/ 

(replacing localhost with your IP address if necessary).

This will take you to the EMQX Dashboard, where you can establish client connections or monitor running status. 

The default login credentials are:

username: admin

password: public

Verifying Connection with MQTTX

Let’s test the connection and message services using MQTTX, a multi-platform MQTT 5.0 desktop client available on macOS, Linux, and Windows.

The following section shows how to verify your connection using MQTTX Web, a browser-based MQTT 5.0 WebSocket client tool. This tool requires no downloads or installations.

To set up the MQTT connection:

1. Visit the MQTTX Web tool here: https://mqttx.app/web 

2. Click on + New Connection to navigate to the configuration page.

3. Name your connection (e.g. MQTTX_Test)

4. Choose your protocol type from the drop-down list. Note that MQTTX Web only supports the Websockets protocol.

5. Enter the EMQX broker address, e.g. emqx@127.0.0.1

6. Fill in the port number (e.g. 8083 for the WebSockets protocol)

7. Keep the default settings for other fields, or adjust them according to your requirements

8. Hit the Connect button at the top-right corner of the page

After establishing a successful connection:

• Subscribe to various topics by clicking on the + New Connection button. MQTTX Web pre-populates some fields to help you subscribe to testtopic/# with a QoS level of 0. Repeat this step to subscribe to more topics, while MQTTX Web assigns color codes to different subscriptions for easier recognition.

• Evaluate message send/receive functionality. Click the Send button at the chat area's bottom right, and you’ll see successfully sent messages in the chat window above.

More Information

EMQX

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