MQTT brokers

An MQTT broker is a server that manages the exchange of information between devices in a network using the MQTT protocol. Think of it as a central hub that receives messages from devices (publishers) and sends them to other devices (subscribers) interested in those messages. Devices don't communicate directly; instead, they connect to the broker, which ensures messages are delivered efficiently and securely. This setup is especially useful for IoT systems, where many devices need to share data reliably with minimal network load.