What Is MQTT and How Does It Use IP Addresses?

Introduction: The Lightweight Messenger

Most web browsers use a 'Heavy' language called HTTP. For a tiny lightbulb with a tiny battery, HTTP is too slow and uses too much power. Instead, IoT devices use MQTT (Message Queuing Telemetry Transport). It is a 'Lightweight' protocol that allows devices to share data over an IP network with almost zero overhead.

The Broker Model

MQTT doesn't work 'IP-to-IP'. Instead, every device talks to a central **Broker** (like a server). The broker has a fixed IP address. When a device updates its status, it 'Publishes' a message to the broker, and anyone else (like your phone) 'Subscribes' to that same message. It is the gold standard for IoT speed.

Conclusion

MQTT is why your smart home feels so fast. It turns the complex web into a simple conversation. See MQTT in action here.