This article will delve into how to implement the Request / Response pattern under the asynchronous message delivery framework of MQTT, with the new features of MQTT 5.0.

Will Message is an important feature in MQTT, which solves the problem that only the server can know whether clients are offline. It allows us to gracefully take follow-up actions for unexpectedly offline clients.

Shared subscription is a new feature introduced by MQTT 5.0 protocol, which is equivalent to the load balancing function of subscribers.

In this article, we will introduce the session mechanism of MQTT protocol, as well as Clean Start and Session Expiry Interval, two connection parameters used to manage the session lifecycle.

In this article, we will focus on the Payload Format Indicator and Content Type properties of MQTT 5.0, exploring how they make the parsing of messages more transparent and efficient.

The Message Expiry Interval is a new feature introduced in MQTT 5.0, which allows the publisher to set an expiry interval for time-sensitive messages.

Introduce Maximum Packet Size in MQTT and explore how to ensure the sent MQTT packets are always smaller than the Maximum Packet Size.

Explain what is Subscription Identifier in MQTT and how it works. Demonstrate how to set a Subscription Identifier for subscription through an example.

In this article, we will focus on exploring the available subscription options in MQTT and their usage.