Simple implementation of MQTT communication using MQTTnet in .NET7

Simple implementation of MQTT communication using MQTTnet in .NET7 1. Introduction to MQTT MQTT (Message Queuing Telemetry Transport) is a lightweight message transmission protocol, mainly used for communication between IoT devices. MQTT protocol adopts client/server architecture, supports publish/subscribe mode and point-to-point mode, and has the advantages of high efficiency, reliability and flexibility. The MQTT protocol mainly consists of three elements: publisher, broker and subscriber. The publisher publishes the message to the proxy server, the subscriber subscribes the message from the proxy server, and the proxy server sends the message to the subscriber. Another important concept in the MQTT protocol is topic. Topics are used to define the type and content of messages. Publishers can publish messages to one or more topics, and subscribers can subscribe to messages from one or more topics. . The MQTT protocol can transmit a large number of messages with low bandwidth over an unreliable network, and is suitable for various types of IoT applications, such as smart home, Internet of Vehicles, industrial Internet of Things, etc. Due to its light weight, high reliability, and fast response, the MQTT protocol has been widely used in the field of Internet of Things. 2. Introduction to MQTTnet MQTTnet…