MQTT
MQTT (Message Queuing Telemetry Transport) is the dominant messaging protocol in IoT and Industrial IoT (IIoT) applications. Its extreme lightweight design — minimal bandwidth, low overhead — makes it ideal for connecting sensors, actuators, and embedded devices over unreliable networks including cellular and satellite connections.
What is MQTT?
MQTT is a publish/subscribe protocol that runs over TCP/IP with a simple broker architecture (commonly VerneMQ, Mosquitto, or HiveMQ). Clients publish messages to topics; the broker routes them to all subscribers. It supports three QoS levels (0 = at most once, 1 = at least once, 2 = exactly once), retained messages, last will and testament (LWT) for device-offline events, and persistent sessions. TLS/SSL provides secure transport.
Why MQTT matters for your career
MQTT has become the de facto standard for device-to-cloud communication in IoT because it consumes minimal bandwidth, works on networks with intermittent connectivity, and scales to millions of connected devices. Engineers who understand MQTT are core to any hardware or IoT startup team.
Career paths using MQTT
MQTT knowledge is valued for IoT Engineer, Embedded Software Engineer, Backend Engineer (IoT), and IIoT Solutions Architect roles. It's also relevant for Platform Engineers building IoT infrastructure at scale.
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Frequently asked questions
What's the difference between MQTT and HTTP for IoT?▼
HTTP is request/response — the client always initiates. MQTT is publish/subscribe — the broker pushes messages to subscribers as they arrive. For devices that need to receive commands anytime and send sensor data frequently, MQTT is far more efficient.
What's a retained message in MQTT?▼
A retained message is the last message published to a topic that the broker stores and delivers immediately to any new subscriber on that topic. Useful for device state — a new subscriber immediately gets the current state without waiting for the next publish.
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