Cloud Based Implementation Of IoT Using MQTT Brokers

This cloud-based Internet of Things system functions by establishing a lightweight, event-driven communication pathway between physical sensors and remote dashboard interfaces using the MQTT (Message Queuing Telemetry Transport) protocol. At the edge, an Arduino Uno or ESP8266/NodeMCU reads environmental data, such as temperature values, from an attached temperature sensor. Because the microcontrollers may use Wi-Fi or serial communication, they act as MQTT publishers, packaging sensor readings into lightweight text packets called payloads. These payloads are transmitted over a network to an intermediate message broker, which can be locally hosted using Mosquitto on a Raspberry Pi 5 or managed via cloud-based services like CloudMQTT or DIoTY. The broker manages all connected clients using a publish-subscribe topic structure, ensuring that messages sent by the hardware nodes are routed efficiently to any listening subscribers. On the receiving end, a user interface running on a handheld phone, computer, or specialized IoT MQTT App subscribes to the specific data topics. This allows the remote dashboard to display real-time updates instantly whenever the physical sensor publishes a new reading. The Raspberry Pi 5 can also act as a local hub, processing incoming data or hosting the broker to create a seamless bridge between local sensor hardware and global cloud infrastructure, enabling responsive remote monitoring and control without requiring complex network configurations.