MQTT is a lightweight IoT messaging protocol based on publish/subscribe model, which can provide real-time reliable messaging services for connected devices with very little code and bandwidth. It is widely used in industries such as IoT, mobile Internet, smart hardware, Internet of vehicles, and power and energy.

Django is an open-source Web framework and one of the more popular Python Web frameworks. This article mainly introduces how to connect, subscribe, unsubscribe, and send and receive messages between MQTT clients and MQTT brokers in the Django project.