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This page is meant to document how well WearOS watches function with Juggluco. Everyone can contribute to this wiki. If you have experience with a certain watch, you can add your observations. Please tell with what type of sensor you use the watch (US Libre 2, EU Libre 2 or Libre 3) and how you use the watch. You can describe how it functions with the sensor directly connected with the sensor and when the phone is directly connected with the sensor and the watch receives its data from the phone. Describe the advantages and disadvantages. In general I can see that the watch needs to be from after Android Wear was renamed to WearOS. This means that it runs Android 8 or higher. Juggluco can't use the NFC in the watch and scanning is always done with the phone.
One of the cheapest WearOS watches currently on the market and it in generally functions in agreement with its price. When the phone is connected with the sensor and the watch receives the glucose values from the phone, the watch functions without difficulty; nearly always receiving glucose values when available. Sometimes sync or reinit is needed. How well it functions when directly connected with the sensor, depends on the sensor and on the activity of the user. A fourth of the sensor have connection errors when I make a walk, but only now and then when I am at home. The previous description applies to EU Libre 2 sensors. My experience with Libre 3 sensors is more positive, but is restricted to only a few sensors; not enough to say that they have less connection errors than Libre 2 sensors.
A 30 Euro second hands exemplar functions as well as Watch 4 when directly connected with Libre 2 sensors, except when it is moved very little. When moving very little while I am asleep, Bluetooth of the watch is turned off. This means that it will lose contact with both the sensor and the phone. The only way I know of to prevent this, is to put the watch on the charger, but then you can’t use it to easily see your glucose level at night. When directly connected with a Libre 3 it only receives every 2 minutes instead of every minute a glucose value from the sensor.