MQTT Publish-Subscribe Basics

Learning objectives

• Explain publisher, broker, and subscriber roles in MQTT pub-sub
• Trace broker topic matching from publication to subscriber delivery
• Design a topic and subscription record for IoT telemetry
• Identify wildcard, retained-message, QoS, and last-will review risks
• Record broker evidence for routing, authorization, and stale-data checks

Knowledge checks · 3

1. What is the main design value of MQTT publish-subscribe in an IoT deployment? ikc-lflp0
2. A dashboard needs all temperature readings from greenhouse 2, but not other sites or… ikc-9hvzsh
3. A new dashboard receives every topic under site/#, including maintenance commands and… ikc-5m77so

Placed labs · 2

• Publish motion and a timed light command · 45 min
• Subscribe to commands and report the light state · 45 min