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UDP Server

Introduction

This server allows exchanges between the Centrale C and the totems. Active totems can be detected and are inserted/deleted in a dynamic way into the database.

Description

This server uses the UDP protocol to create the connexions. The informations received by the server are put in a postgres database.

Installation

server.py and utils.py must be installed in the Centrale C. client.py and number.txt must be installed in each totem.

Requirements

  • python 3.10.7
  • pip 21.3
  • psycopg2 2.9.5

Needed environment variables

The database credentials are stored in the file ../database_credentials.env. This file is not tracked by git. It should be created with the following content:

    DB_HOST=YOUR_DB_HOST
    DB_PORT=YOUR_DB_PORT
    DB_NAME=YOUR_DB_NAME
    DB_USER=YOUR_DB_USER
    DB_PASSWORD=YOUR_DB_PASSWORD

The server IP is stored in the file ../centrale_Info.env. This file is not tracked by git. It should be created with the following content:

    IP=YOUR_SERVER_IP

Each number.txt has a distinct 4 digit number that correspond to the ID of the totem.

Usage

Run the server

To run the server, you need to have a postgres database running. You can then run the api with the following command:

    python ./server.py

Change the ping

To change the interval time between ping from the server (to check which totems are still connected), change the value (in seconds) in server.py : TIME_PING

To change the interval between ping from the totems (messages sent to the server to show its connexion), change the value (in seconds) in client.py : TIME_PING

TIME_PING from server.py must be bigger than TIME_PING from client.py

Change the IP Address

To ensure a connexion between the server and the totems, the IP address between server.py and client.py must be the same, the IP coming from the server side.