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Dr. Javier Gonzalez-Sanchez [email protected] www.javiergs.info o ffi ce: 14 -227 CSC 508/9 Software Engineering (Design & Deployment) Lecture 10. Publisher-Subscriber

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Previously MQTT

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Message Queuing 3

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Eclipse Paho for Java Wh a t is Eclipse P a ho? • A set of MQTT client libr a ries developed by the Eclipse Found a tion. • It supports multiple l a ngu a ges, such a s J a v a , Python, J a v a Script, etc. J a v a Dependency (M a ven) org.eclipse.paho org.eclipse.paho.client.mqttv3 1.2.5 4

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https://github.com/CSC3100/MQTT

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Quality-of-service options • 0 – "at most once": A.K.A. "fire-and-forget." This option is suitable when message loss is acceptable, as it doesn't require acknowledgment or persistence. • 1 – "at least once": This option should be chosen when message loss is unacceptable, and your subscribers can handle duplicate messages. • 2 – "Exactly once": This option is ideal when message loss is unacceptable, and your subscribers cannot handle duplicate messages. 6

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https://github.com/CSC3100/MQTT

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Pong 8 https://github.com/CSC3100/Pong-Game

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Assignment 03 Brokerverse

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MultiPlayer Game 10

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Questions 18

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CSC 509 Software Engineering Javier Gonzalez-Sanchez, Ph.D. [email protected] Fall 2025 Copyright. These slides can only be used as study material for the class CSC509 at Cal Poly. They cannot be distributed or used for another purpose.