Lightweight publish-subscribe protocol for IoT.
MQTT is a publish-subscribe protocol over TCP with brokers, topics, QoS 0/1/2, retained messages and last-will. Minimal overhead suits constrained devices and unreliable networks. Use TLS and authentication.
A sensor publishes 23.5 to farm/field1/temp; the dashboard subscribes.
MQTT is a lightweight messaging protocol that suits sensors and devices with limited bandwidth and power.
Lightweight publish-subscribe protocol for IoT.
MQTT is a lightweight messaging protocol that suits sensors and devices with limited bandwidth and power.
A server that receives messages from publishers and forwards them to subscribers that have registered interest in a topic.
A setting that controls message delivery guarantees, from at most once up to exactly once, which trades reliability for overhead.
Typical applications include publishing sensor readings from many devices to a central broker, subscribing a dashboard to temperature topics for live charts and sending commands to a device using a topic it listens to.
Study "Internet of Things" first (topic 86 of 104 in Electronics & Embedded). It covers the groundwork this topic builds on.
Topic hierarchy home/room/temp. Keep-alive. Brokers: Mosquitto, EMQX.
A sensor publishes 23.5 to farm/field1/temp; the dashboard subscribes.
The next topic is "Edge computing", which builds directly on this one.
It is classed as Advanced in Electronics & Embedded (topic 87 of 104). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Electronics & Embedded.
Want to practise? Open the interactive course for quick checks, quizzes, simulations and progress tracking.