This is a simple service for finding the most recent IP address of a box. Useful for being able to SSH into embedded devices that move around a lot.
The client just sends a request to a checkin server with a list of its local interfaces and its unique id. The checkin server records the public IP address of the request and saves it to the datastore. The API is also simple:
GET /checkin/<uuid>: Perform a checkin
GET /status/<uuid>: Return a JSON representation of the given machine's last checkin
GET /status: Return a JSON representation of all checkins (admin only)