Coding exercise - Smart building

This exercise will be achieved partly as homework (see questions below) and partly in a pair-programming style (on a follow-up call).

Brief - outline and questions

The building you are in possesses a few sensor nodes (devices). These devices measure the temperature and humidity of the room they are in, and the data can be collected through a Gateway. This Gateway exposes a JSON-based REST API with a few endpoints (see the full documentation of this API below). Your goal will be to write a small program that interacts with the Gateway API in order to retrieve data from the devices.

In the questions below, the command is just a string passed as an argument to your program. For example, it is expected for the version command to be called by typing ./yourExecutable version (or similar) into a terminal.

1. Write a program that prints “1.0.0” when the version command is given.
2. Implement a command device-count that shows the number of devices in the building.
3. Implement a command timeout-devices <threshold> that list the UUIDs of all the devices that have a response time above the given threshold.
4. Implement a command register-device <device-uuid> <room-uuid> that assigns a device to a room.

Data structure

Room {
  uuid: String
  label: String
  floor: Int
  devices: [ Device ]
}

Device {
  uuid: String
  status: "RUNNING" | "STOPPED"
  responseTime: Float
  room: Room
  temperature: Float
  humidity: Float
}

Public API

List all devices

GET /devices

Show a specific device

GET /devices/<uuid>

Show a room

GET /rooms

## Private API

The endpoints listed below are only accessible after authentication with a Bearer token.

Assign a device to a room

POST /rooms/<room-uuid>/devices

Input:

{ "uuid": "<device-uuid>" }

Update the status of a device

PUT /devices/<device-uuid>/status

Input:

{ "status": "RUNNING" | "STOPPED" }

Remove a device

Only stopped devices can be removed.

DELETE /devices/<device-uuid>