Abbott's Freestyle Libre 2 sensors transmit every minute the perceived glucose value to the connected reader or smartphone. Abbott's Librelink app uses this value only for low and high glucose alarms. Juggluco displays this value on the smartphone in addition to low and high glucose alarms. So you can know your current glucose value without scanning.
The values received via Bluetooth are identical or differ minimally from the current glucose value received by scanning. The history values (the values of the last 8 hour received by scanning from the sensor, shown in the Daily Graph of the Librelink app) are different; they are less extreme than the scanned and streamed (Bluetooth) values.
The glucose values are influenced by previous readings; thus although Juggluco and Abbotts Libre app determine glucose values the same way, they can differ when one of them is used longer. While using Juggluco and Abbotts Libre app beside each, differences will decrease with time.
Juggluco can only take over the Bluetooth connection of a sensor that is already in use, when ALL COMPETING CONNECTIONS WITH THE SENSOR ARE REMOVED by FORCE CLOSING the Libre app and turning off Freestyle reader or turning off alarms of these apps and devices. Hereafter you scan the sensor a few times with your smartphone while Juggluco is in the foreground and, when everything goes well, within 20 minutes or less Juggluco will establish a connection with the sensor and start receiving glucose values via Bluetooth.
After using a sensor with Juggluco, you can still scan the sensor with Librelink or Freestyle Reader, but their alarms will never work again (Patched versions of the Libre 2 or Librelink app can take over the Bluetooth connection (so that it doesn't work with Juggluco anymore) when the sensor is new for them, but they have their alarms disabled.)
In addition to the Bluetooth stream of glucose values, Juggluco displays the result of scanning: the current value and past 8 hours history out of the memory of the sensor. All in one detailed graph.
You can also add your amounts of insulin, carbohydrate and activity to the graph.
From the Bluetooth stream data summary statistics are generated: time in range, estimated A1c and, if enough data is gathered, a summary graph.
Juggluco can send glucose values to smartwatches in four ways:
- by creating an Android notification that is redirected to some smartwatches (Notify);
- via watch app Kerfstok running on some Garmin watches;
- via xDrip watch apps on all kinds of smartwatches;
- Juggluco for WearOS.
Starting with Juggluco 2.2.1, Juggluco can also be used with US Freestyle Libre 2 sensors.

WearOS

A variant of Juggluco now runs on Wear OS. It also contains a watch face that shows the minutely glucose value, besides the time and four complications.
Every sensor has to be initialized by the connected Android phone running Juggluco.
Juggluco for Wear OS can operate two ways:
• Receive the glucose values from a smartphone connected to the sensor;
• Directly connect the watch with the sensor and send the glucose values from the watch to the phone.
Previously a direct connection only worked for half the sensors on Watch4, but after adding the Turbo setting, it worked on all four sensors I tried it on.
For unknown reasons, data is only exchanged between watch and phone, when the phone has an external connection (for example WiFi or mobile data), although Internet is not used by Juggluco.
For more information see http://jkaltes.byethost16.com/JugglucoWearOS