CLIENT_ID=<discord application client id>
CLIENT_SECRET=<discord application client OAuth secret>
REDIRECT_URI=<your OAuth2 redirect URI, must match the one set in your Discord application>
ESP_IP=<IP address of your ESP device>
ESP_PORT=<port number your ESP device listens on>
LISTEN_PORT=<port number your application listens on>
TOKEN_FILE_PATH=<path to store OAuth2 tokens, relative to project root, or absolute>