Suggestions
A way to POST current location to a custom endpoint periodically
It would be absolutely awesome to be able to use Arc as a source of events for home automation. Since there’s no (and neither will be, as you stated) an API to get [near] real-time location data from the app, another way to implement it would be to allow a user send location data to a custom endpoint with user-defined intervals. The thing I particularly have in mind is Huginn (https://github.com/huginn/huginn) and its “User Location Agent” routine (https://huginnio.herokuapp.com/agents#UserLocationAgent), but integration opportunities are virtually endless.