IoT Protocols: MQTT, CoAP, and Beyond
IoT Protocols: MQTT, CoAP, and Beyond IoT devices often send small messages over networks that may be slow or noisy. Two well known options are MQTT and CoAP. They were built for low power devices and simple data. But many projects also mix other protocols to fit needs like security, real time, or cloud links. This guide helps you choose what fits best. MQTT is a lightweight, broker-based system. Publishers send messages to a topic, and subscribers listen to topics they care about. The broker routes messages from publishers to subscribers. MQTT supports three QoS levels, retained messages, and a Last Will. It works well when devices connect irregularly and rely on a reliable central hub. A simple example is a temperature sensor sending to the topic home/livingroom/temperature with QoS 1, so a server sees the update at least once. ...