This is exciting... I'm running the current nightly build of xdrip+ from 10/17 (this is the code in real time as its under development, so there is a high risk of software bugs and other problems), and it now has the ability for an Android Wear smartwatch to communicate over bluetooth DIRECTLY with the G5 -- a phone running an app does not need to be in the loop.
It seems to be working fine, although I've only been running it for 30 minutes. My phone is currently shut down (which I can't keep that way for too long -- no calls/texts/etc.), and my watch is dutifully collecting readings.
This is very exciting... I probably have my watch with me (on my wrist) more consistently than any other gadget, including my Dexcom receiver. I have also made the mistake from time to time of leaving the house and forgetting my phone on a saturday running errands.
Supposedly, all this data "syncs up" with the phone when the watch and phone connect again in the future. I'll know how that works in another 15 minutes or so when I turn the phone back on.
If you have a Dexcom G5 and an Android Wear smartwatch, you can try this version of xdrip+ out by downloading and installing the latest nightly build from the Google Drive repository here.
The gaps in the readings above are because I was installing different builds of the app, playing with the settings, etc. to get it all working right.