James “Bald Engineer” Lewis delivers a primer for understanding MQTT.
In the case of MQTT, there is a broker, and there are clients. The broker is the “Post Office”, or in computer terms, the “server.”
Clients can publish (Pub) messages, or send letters, to the post office. Other clients can subscribe (Sub) to topics, or receive letters, from the post office. Moreover, clients can both publish and subscribe.
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