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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.

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 .

Taking the common scenarios of Internet of things as an example, this article introduces how to use the EMQX message middleware and the open source data visualization solution of InfluxDB + Grafana to conveniently display a large amount of time-series data of IoT devices.

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.

This example will demonstrate how to report the temperature and humidity data collected by the DHT11 sensor to the MQTT service in the cloud through the MQTT protocol and the NodeMCU based on ESP8266 , and show how the application subscribes to and processes the data.

This article lists the MQTT client libraries of some commonly used programming languages, and uses sample codes to help readers get started quickly.

Helm3 was released in November 2019, which adds many new features compared to Helm2.In this article, how to deploy EMQX cluster on Kubernetes via Helm3 will be introduced.