MQTT X is a cross-platform MQTT 5.0 client tool open sourced by EMQ (, which supports macOS, Linux, Windows. The user interface of MQTT X simplifies the operation logic of the page with the pattern of chatting software. Users can quickly create multiple simultaneous-online MQTT clients to test the connection/publish/subscribe functions of MQTT/TCP, MQTT/TLS, MQTT/WebSocket and other MQTT protocol features.


See EMQ Blog ( or MQTT X manual ( for details.

  1. MQTT Broker preparation.
    • If you do not need the MQTT Broker deployed locally, you can use the online public version of EMQ X for the quick test:

      Broker IP:

      Broker TCP Port: 1883

      Broker SSL Port: 8883

    • If you plan to deploy an MQTT Broker running locally, we recommend you to download EMQ X MQTT Broker ( for installation. EMQ X broker is a fully open-source, highly scalable, highly available distributed MQTT messaging broker for IoT, M2M and Mobile applications that can handle tens of millions of concurrent clients.

  2. Connection configuration. Click the + button in the left menu bar and fill in the corresponding required fields in the form.
  3. After the connection information is configured, click the Connect button in the upper right corner to create a connection and connect to the MQTT Broker.
  4. After the MQTT is connected successfully, you can perform MQTT publish and subscription tests.


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