Maintain a list of users in your office/house using ARP tables to resolve IP and MAC addresses.

Zach Holman's play mentions how Github work out who is in the office which I'm trying to replicate here with interchangeable backends.

Stalker provides a JSON REST API allowing you to query the current user list. A GET request to / will return a list of hosts like so:

[
    {
        "mac": "00:00:00:00:00:00",
        "ip": "192.168.0.0"
    }
]

Since all routers display their ARP tables at different urls, and may even provide an API, stalker provides a backend architecture.

Set the BACKEND variable in settings.py to the python path of you backend class:

BACKEND = 'backends.my_router.Backend'

flask, backed with redis, fronted with gunicorn, nginx.