Name: xDrip+/Spike/Nightscout Datafield
Author: andreas-may

This datafield gets your CGM bloodglucose readings directly from xDrip+ app (Android only) and - if you have closed the loop with AndroidAPS - a loopstatus line. If you change the settings you can use this datafield also with AAPS (Android only) or Spike app (iOS only) or with a web request from your Nightscout installation.
For newer devices, I have adapted this data field so that the blood glucose source can be queried not only every 5 minutes, but also more frequently. If your device is supported by this data field, I strongly recommend using this new version: https://apps.garmin.com/apps/910c3df4-8b46-45d8-9200-1eba69bc10c4
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FEATURES
- Last bloodglucose reading (mg/dl and mmol/l), delta and minutes since last reading
- TBR (%), IOB and COB  (AAPS only)
- Possibility to write bloodglucose and in Closed Loop mode also TBR, IOB and COB to the fit-file of your activity and see the values in Garmin Connect.
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PLEASE READ THIS ADVISORY
Never make a medical decision based on a reading that you see on this app e.g. your watch. Always perform a fingerstick blood glucose check first.
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README and HELP
The readme of my watchface also answers questions that may arise in connection with this data field:
https://github.com/swissalpine/GARMIN-xDrip-Spike-Nightscout-Watchface/
It is highly recommended to inform yourself there about the setup and possible problems!
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INSTALL COMPANION APP
You need to install the  xDrip+, AAPS or Spike app or get readings via web request from Nightscout:
https://github.com/NightscoutFoundation/xDrip/releases
https://jamorham.github.io/#xdrip-plus
https://github.com/Nightscout/AndroidAPS/
https://spike-app.com
You didn't find these apps in app stores!
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To enable communications between this datafield and the Android companion app xDrip+ you have to enable “xDrip Web Service”, "Open Web Service" must be disabled (xDrip+: Settings - Inter-app settings).
If you like to see your loop status enable AAPS as data source.
AAPS can also be queried directly. You need v3.2.0.4 or newer. Activate the Garmin plugin in the Config Builder.
For Spike you have to enable the Internal HTTP Server (Settings - Integration - Internal HTTP Server).
Another way to view your CGM data is to query the Nightscout values via the internet. Please enter your URL _without_ "https://" and "/api/etc."!
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SETTINGS (via GARMIN MOBILE CONNECT or GARMIN EXPRESS)
Choose Spike or AAPS if you don't use xDrip+. If Nightscout URL is selected, your Nightscout URL must be entered (e.g. "myname.herokuapp.com" without "https://" and without "/api/v1/").
Enable saving diabetic data to the fit-file of your activity.
Adjust the delay of the request.