8. Implementation and Comparison of MQTT, WebSocket, and HTTP Protocols for Smart Room IoT Application in Node-RED

Internet of Things portrays a general notion for capability of devices to sense and collect data and share it via the Internet, where it can be refined and applied in numerous applications. This chapter gives an overview of IoT architecture and different components of IoT, along with some applications. IoT-based smart room application has been implemented and presented in this work in detail. The hardware that has been used for smart room application is a NodeMCU controller board and some sensors such as proximity sensor, gas sensor, flame sensor, and temperature and humidity sensor. Smart room application has been implemented with the help of IoT protocols like MQTT, HTTP, and WebSocket. All the hardware components and protocols used in the implementation of the application have been discussed in the chapter. Also, the theoretical comparison of three protocols—MQTT, WebSocket, and HTT—has been drawn. For implementation of design using IoT, Node-RED is used. Node-RED is an open-source software used to wire together all the hardware devices and APIs. The response time delays of all these protocols for the smart room test bed have been found and compared. Also, the present work has been compared with some of the related existing work in literature.