MQTT

ELI5 — The Vibe Check

MQTT is the WhatsApp of IoT devices. It's a super lightweight messaging protocol designed for tiny sensors and bad networks. Your smart thermostat uses MQTT to tell your phone it's cold, even over a flaky WiFi connection.

Real Talk

A lightweight publish-subscribe messaging protocol designed for constrained devices and low-bandwidth, high-latency networks. MQTT uses a broker architecture, supports QoS levels (0: at most once, 1: at least once, 2: exactly once), retained messages, and last will testament. Widely used in IoT and telemetry.

When You'll Hear This

"Every IoT sensor publishes data via MQTT to the central broker." / "MQTT's QoS levels let you choose between speed and delivery guarantees."