MQTT is an OASIS standard messaging protocol for the Internet of Things (IoT). It is designed as an extremely lightweight publish/subscribe messaging protocol, ideal for connecting remote devices with a small code footprint and minimal network bandwidth. Today, MQTT is widely used in a variety of industries, including automotive, manufacturing, telecommunications, oil and gas, and more.
This article introduces how to use MQTT in Java projects to implement functions such as connection, subscription, unsubscription, publishing and receiving messages between clients and brokers.
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