Mqtt - ICPDAS ET-2268 CR User Manual

ET-2200 Series Ethernet I/O Modules

4.12 MQTT

AIO Module
DI/DO Module
The MQTT architecture mainly consists of a server (Broker) and clients (Clients). Each MQTT Client
requires a unique identifier, and the MQTT Broker identifies users based on these identifiers and
records their status, such as subscribed topics and communication quality. Clicking on the MQTT tab
opens the MQTT settings page.
MQTT is a protocol consisting of a Publish/Subscribe mechanism where the Client only needs to
know the IP address of the Broker. The Publisher is responsible for sending topic messages, while
the Subscriber is responsible for receiving new messages from the Broker. The Broker then acts as a
central location to handle the sending and receiving of all messages between a Publisher and a
Subscriber.
When the Publisher updates a message related to a specific topic, it is transmitted to the Broker,
which will then send the message to all Subscribers that have subscribed to that particular topic.
Neither the Publisher nor the Subscriber needs to know the status of the other.
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