JustIoT Internet of Things based on the Firebase real-time database

This paper designs an Internet of Things system (called JustIoT) which is mainly divided into four parts; back-end Google Firebase real-time database, front-end SPA (Single Page Application) web monitoring program (including mobile monitoring App), controller software-hardware, and intelligence server that support MQTT connection and condition control. JustIoT receives data from all kinds of controllers, allowing users to set the control rules and remote monitoring and control. JustIOT distinguishes users from managers, vendors, customers, registrants, and visitors. Users can build applications in the above system, to serve customers, and to run a business. In the JustIoT, management web page based on Angular front-end technology is connected to the Firebase real-time database. The event of data modification of Firebase database can trigger Angular's two-way data binding to achieve Three-way data binding effect to implement server-less architecture easily. The data in Firebase database is read and written by the front-end devices (web apps, mobile apps, and controllers) directly. The intelligence server is an MQTT server that supports the connections of relatively weak embedded controllers such as the Arduino controller. The intelligent server can be considered as an intermediary between the Firebase real-time database and weak controllers, which performs the transfer of data and remote commands. The intelligent server is also the intelligent computing center of the JustIoT. It performs condition control.