Use Case 9: Basic Server Setup

[arilloid]

Basic Server Setup

User Story

As a backend developer, I want to set up a server that will be able to process HTTP POST requests from Raspberry Pi and HTTP GET requests from the frontend application. The newly received data should be broadcasted to the frontend in real time using WebSocket connection.

Description

This use case involves setting up a basic JavaScript server that can process HTTP POST requests for storing sensor data (temperature, humidity, and moisture) sent from a Raspberry Pi device and HTTP GET requests for sending the data to the frontend for display purposes.

Sensor data collected by a Raspberry Pi device needs to be sent to a server via HTTP for further processing and storage. The server should be capable of validating and storing this data in the in-memory database. in addition to this, the server should be able to process the GET requests for data retrieval. After the initial retrieval of the data, the data should be broadcasted to the frontend application in real time using WebSocket connection.

Acceptance Criteria

• [x] A JavaScript project is initialized with all necessary dependencies.
• [x] An endpoint is created to receive HTTP POST requests from Raspberry Pi.
• [x] The received data is successfully validated and stored in the in-memory database.
• [x] The server responds with HTTP 200 OK on successful data reception and storage.
• [x] The server processes the GET request and returns the data in JSON format.
• [x] The server responds with appropriate error messages (HTTP 400 Bad Request or HTTP 500 Internal Server Error) for invalid data or internal server errors.
• [x] The server is able to establish connection with the frontend using WebSocket connection.
• [x] The data that is received from Raspberry Pi is broadcasted to the frontend in real time.

Testing

Normal Flow of Events

The server receives the HTTP POST request with sensor data from Raspberry Pi. The server validates the incoming data. The server stores the data in the in-memory database. The server responds with a success message (HTTP 200 OK).

The frontend application sends an HTTP GET request to the server endpoint to retrieve the stored sensor data. The server processes the GET request, retrieves the data from the database, and responds with the data in JSON format. The frontend application receives the data and displays it to the user.

When the server receives new sensor data it gets broadcasted to the frontend application in real time using WebSocket connection.

Alternate/Exceptional Flows:

S-1: Internal server error

The server encounters an unexpected error while processing the requests. The server responds with HTTP 500 Internal Server Error. The error is logged for debugging purposes

S-2: Invalid data format

The server rejects the data due to invalid formatting (e.g., missing fields), and responds with HTTP 400 Bad Request and a relevant error message. The error is logged for debugging purposes.

[arilloid]

Issue successfully closed

I have built a server that can process HTTP POST and GET requests with the sensor data, as well as store the data in the in-memory database (sensor_data.csv file), as per the acceptance criteria. The server application was built using JavaScript, Node.js, Express.js.

[arilloid]

Updated the code and issue description to support WebSocket functionality, which was added to push the newly received Raspberry Pi data to the frontend in real time, instead of polling the data from the server every time the in-memory database gets new entries.