Wrong maxSensorDays shown for Libre 3 Plus via LibreLinkUp follower mode

[Rig22]

XDrip4ios shows a total runtime of 14 days. But the actual runtime for the L3 Plus is 15 days.

[paulplant]

Issue Report requested to see if we have any way of identifying a L3Plus (compared to a standard L3) in the data response from LibreLinkUp. If so, we should show 15.5 days max lifetime instead of 14.5 days.

[Rig22]

If so, we should show 15.5 days max lifetime instead of 14.5 days.

Differently than the Libre 2, whose wearDuration is established during the factory calibration and readable at FRAM[326...327], the Libre 3 that I tested until now always had a fixed wearDuration of 20160 minutes, therefore 14.0 days precisely, not 14.5 days.

A Libre 3 wearDuration can be extracted from the bytes [6...7] of the extended 24-byte patchInfo returned by the usual NFC custom command A1 (they are prepending dummy A5 bytes and appending a final CRC16).

According the logs Libre 3 Plus's wearDuration is of 21600 minutes, therefore 15.0 days. Its firmware version (patchInfo[8...11]) looks the same as for my current Libres 3, 1.4.2.30, while the only difference is a version bump from 0 to 1 of the generation number (patchInfo[4...5]).

[paulplant]

@Rig22 , I think you're replying to comments that have already been deleted.

But yes, the idea would be to show 15.5 days maxSensorDays instead of 14.5 but from the Issue Report you sent, I can see that there is nothing that indicates that it's a "Libre 3 Plus" instead of the previous Libre 3 so there's currently no way to detect that we should show a different max lifetime.

I need to think of a different way to do this, but it will probably involve the user having to tell the app (in LibreLinkUp follower mode) that it's a "plus" sensor and then adjust accordingly.

[Rig22]

Hello Paul. 🙂 Yes, you know who the original comment was from. Unfortunately it was deleted. I thought it had such important information for you that I posted it again. Let me know, if there is anything I can do.

[Rig22]

Hello Paul. 🙂 I personally think the solution you are talking about is completely sufficient. When connecting once every 15 days, flipping a small switch to tell xdrip that it is a Libre 3 plus would be no effort.

[Rig22]

What I had completely forgotten was that after 14 days and 2 hours, not only was the Bluetooth connection terminated, but there were no more values ​​coming in from LibreLinkUp either, so I had to install a new sensor. As expected, the LibreLinkUp app continued to provide the values ​​even after 14 days and 2 hours.