For integrations with SmartThings, Alexa, Home-Assistant.io OpenHab, maybe Vera or Home Seer, etc then for any modules that go on the smart home hub it would be good to have them as open source on GIT Hub with a permissive licence. What can happen then is if someone sees how to create the SmartThings module they can use this as a working guide to create a module for Vera or Google Home or whatever their preferred smart hub is.
I see the code within Sense as being the valuable IP and suitable to be closed source, but the code outside of Sense as being suitable for open source as a means to grow more quickly.