SF4202 Ethernet Communication IOT MQTT protocol

MQTT Function User Manual

Overview

Message Queuing Telemetry Transport (MQTT) is a lightweight, publish-subscribe based messaging protocol that is suitable for resource-constrained devices and low-bandwidth, high-latency, or unstable network environments. It is popular in IoT applications and enables efficient communication between sensors, actuators, and other devices.

Documentation Download offline：🧷MQTTFunction Block User Manual.zip

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QoS
        Quality of Service (QoS) refers to the quality of service of message transmission. You can set the settings on the message sender and message consumer, respectively.
        QoS settings on the sender: The transmission quality of messages sent from the sender to the server is affected by the MQTT version of the message queue.
        QoS settings on the consumer: affects the transmission quality of messages delivered from the server for MQTT to the consumer.

QoS includes the following levels:
         QoS0: Represents a maximum of one distribution.
         QoS1: Represents at least one time.
         QoS2: The delegate is distributed only once.

This manual uses a Windows computer as an MQTT broker, a personal computer and an icomputer as a client to subscribe and publish information to each other. As shown in the figure below: 

The following table provides an overview of the individual product components of this manual

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