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 .