This is an intriguing idea. My wife (the one with the Dexcom) had her’s integrated with the Pebble for awhile but now has an Apple Watch with the direct integration with her iPhone (no more little blue and black receiver 
).
As far as I can tell, Dexcom discontinued their support for Share:
and I’m pretty sure the G5 doesn’t use any Dexcom cloud servers at all. Though that doesn’t make much sense as there is still the Follow app.
[google google google]
Aha! I found a REST API.
https://developer.dexcom.com/overview
Looking around, this should be very doable. It probably warrants its own binding but it should be feasible to make something work with the HTTP binding and/or sendHttp actions. It would look a whole lot like the iCloud integration prototype
It might even be possible to make just one binding that doesn’t require every user to create a developer account with Dexcom. That would be really cool.
This is really exciting. I wish I had more time to work on this. I’ll have to talk to my wife to see if she is willing to be a guinea pig (she is pretty well controlled and has good hypo and hyper awareness so will not be gung-ho to have her CGM linked to the home automation).
Of course, if you or anyone else wants to run with this that would be awesome. I’ve not much time to work on something like this. If not I’ll start to chip away at it as my time allows.
Thanks for posting!