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Recently, MQTT X released the latest version 1.8.3, The main optimization of function usage and the various problems encountered in the process of use are fixed.

In order to provide more choices and convenience for users to implement MQTT connection tests, MQTT X v1.8.0 adds the command line as a form of interaction - the MQTT X CLI.

MQTT X v1.7.2 release note: Shared subscriptions support topic color markers, add more ARM builds.

MQTT X v1.7.1 release note: Support MQTT 5.0 subscription Identifier, expose more MQTT 5.0 properties on display.

We will introduce in detail the specific use of the new features of MQTT X v1.7.0, especially how to use MQTT X to test features of MQTT 5.0.

Recently, MQTT X v1.7.0 was officially released, from this version, MQTT X will further support many new features of MQTT 5.0.

MQTT X has added a script function since v1.4.2. This article will introduce the use of the script function with two simple instances.

MQTT X v1.4.2 released with script features, automatically append a timestamp to Client ID and optimize some functions.

MQTT 5.0 client tool - MQTT X v1.3.1, which adds an enable item of strictly validating certificate and supports for more attributes of MQTT 5.0.

[MQTT X](https://mqttx.app) is a cross-platform MQTT 5.0 desktop test client provided by the world's leading open source IoT middleware provider [EMQ](https://emqx.io) , 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 and other MQTT protocol features.

MQTT X is suitable for users who are building their own MQTT message server to test connections, subscribing and publishing messages, etc. When using a client, the user can be either a publisher or a subscriber.

MQTT X simplifies the operation logic of the page with the help of chatting software. The user can quickly create a connection to save and establish multiple connection clients at the same time. It is convenient for the user to quickly test the connection of MQTT/TCP、MQTT/TLS, Publish / Subscribe functions and other features .