Help with approach to interface with Home Control Assistant

Hi all - I'm looking for a high level "how do you get at the API" getting started kind of help. Specifically I want to figure out how to access the Ecobee3 API from Home Control Assistant. .HCA does not have a Wifi interface (as in physical interface) but it is connected to the internet, and can be configured with a generic IP interface. So what I'm trying to figure out is -- what would be the mechanism for connecting to the API. Would HCA need to set up communication with the Web app via IP?
Info on HCA configuration for this is here:

I'd really appreciate someone's thoughts on what mechanism I need to build to pull these together. I know they're working on Nest at HCA, but so far, not Ecobee.

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