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This article describes how to use the EMQX Kuiper rules engine and how to implement controlling IoT devices according to the analysis result.

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.

In EdgeX Geneva, EMQX Kuiper - an SQL based rule engine is integrated with EdgeX. The tutorial introduces how to use Kuiper to process the data from EdgeX.

EMQX provides a complete IoT private TCP protocol access solution through server adaptation and device-side adaptation.

Kuiper 0.4.0 now has the capability of supporting more complex plugin; Support template feature for all sinks, so users can customize complex output data.

Kuiper plugin is based on the plugin mechanism of Golang, users can build loosely-coupled plugin applications, dynamic loading and binding when it is running.

The message retention function of [EMQX MQTT Broker](https://emqx.io) is implemented by the `emqx_retainer` plugin, which is enabled by default. By modifying the configuration of the` emqx_retainer` plugin, you can adjust the EMQX Broker's retention message Location, restrict the number of retained messages and maximum payload length, and adjust the expiration time of retained messages.

The Kuiper & EdgeX integration work is almost completed, Kuiper will be integrated with EdgeX nightly Docker composer files soon. Kuiper 0.3.1will be released with EdgeX officially.

Integration with EdgeX, support for Schemaless flow definition, and FVT test case enhancement are added in this version

[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.

EMQX Kuiper is an edge lightweight IoT data analytics / streaming software implemented by Golang, and it can be run at all kinds of resource constrained edge devices.

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.