The Raspberry pi Communication-Network is a network of Raspberry-Pi's. It's currently still in development.
The purpose of this server is to display the status of all raspberry-pi's in the network and the data of several sensors that are connected to these raspberry pi's. The data is stored in a database running on the main backend-server. The frontend-server is running either on a differend device or also on the backend-server-device. If this is the case, then the data is directly fetched from several json files instead of using webservices. The json- files are generated by a script running in the background that get's data from the database and stores it in these json-files every few seconds (depending on the type of data).