Reverse Engineer Glucose Sensor Tags (Libre)

NFC
#1

Hi,
I would like to have the ability to read an Abbot Libre Glucose sensor tag. I can read the raw data.
Are there documents out there where i can determine what I need to decode the raw data ?

Here’s what I read:
ISO15693
UID:
E0 07 A0 00 08 69 B1 32
DSFID: F3
AFI: 07
IC Ref: 00
Blocks: BF
Blocksize:07
Data(1337 bytes)
(truncated to 32 blocks)
17 1D E2 37 E5 46 B7
A4 36 70 4B 13 26 31
04 F5 C1 FB 6F D3 48
58 06 1A 34 3E A9 E7
71 74 15 B3 A3 0A E3
45 A9 17 17 FB FD A5
6D B0 05 A7 F4 89 B6

I realize I would need to write an application that will read all 1337 bytes. I figured I would start that code when I determine that I can decode the data.

#2

i’ve already done this if you’re interested

for libre1 at least, 2&new aren’t reverse engineered yet (xDrip)

1 Like
#3

Very cool! Great job.

#4

Sure, I am interested! Please send me a link to it.

1 Like
#5

Why wouldn’t you post useful pointers instead of pointless teasers?

#6

The Flipper Zero doesn’t run Android. Do you have the source to xDrip so I can make sense of the hexdump ? It would be really cool if you have the write commands reverse engineered so we can squeeze an additional week or two out of each sensor

#7

I used the nfc reader function to get the hexdump from the sensor.