FreeStyle Libre 2
Reverse engineering in progress.
Important device notes
|Device||Vendor ID||Product ID|
|FreeStyle Libre 2||1a61||3950|
This device uses the shared HID protocol used by other meters in the FreeStyle family, but introduces encryption.
Text commands are sent by the original software as message type
The commands sent to Libre 2 devices are encrypted. The encryption covers the 63
bytes remaining following the message type, for most of the message types used
by the device, excluding the pre-initialisation commands (and their replies),
0x22 keep-alive command, and the error replies.
The initialization appears to follow a handshake as follows: