server runs at http://127.0.0.1:5000/
Troubleshooting for macOS:
when running the eye tracker: remember to include username, i.e. ‘Alaina’ or it will default to default_user and eye_tracker data will not record to user-specific CSV (+ additional issues with connecting chrome notifs and eye tracker)
On macOS give permissions to Chrome for notifications/sound & make sure Focus/DnD is off