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Libre 3 protocol #33

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tonnyleonard opened this issue Dec 18, 2023 · 1 comment
Open

Libre 3 protocol #33

tonnyleonard opened this issue Dec 18, 2023 · 1 comment

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@tonnyleonard
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tonnyleonard commented Dec 18, 2023

Did anyone attempt to read a Libre 3 sensor?
I do have the sensor and the official app, but so far the sensor is not applied, although I paired it already. I intend to use it with a diabetic dog, but I understood that the data - at least with Libre 2 - was sometimes crappy, that is, there were wrong readings - therefore I would like to get the raw measurements and process the data on my own.
Originally I intended to use a Raspi 3 (it has BLE incorporated), but then I discovered that they decided to encrypt the communication...
I will test it with the Libre 2 scripts, but if it doesn't work, I guess I will have to do some reverse engineering on my own...
LE: they say that Libre 3 sensors do not work with previous versions of their app or readers:
https://www.support.freestyle.abbott/hc/en-us/articles/17309458176017-Can-I-use-the-FreeStyle-Libre-3-reader-with-other-FreeStyle-Libre-CGMs-
But I wonder whether the communication protocol was changed or not.

@isotherm
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isotherm commented Feb 9, 2025

The protocol is the same, but the format of some of the messages has changed (comments and some other values are removed). I have a pull request adding support to glucometerutils at glucometers-tech/glucometerutils#131. It also contains some sample data output and could be used to produce the appropriate documentation here.

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