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accuchek

★ 42 Open GitHub ↗

C++ code to read data from a Roche Accu-Chek Guide blood glucose monitor over bare metal USB

// repository documentation

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# Roche Accu-Chek Guide sample download utility

## **TL;DR:**

Linux C++-17 code to download samples from a "ROCHE ACCU-CHEK Guide"
blood glucose monitor using libusb

## **To compile:**

+ install libusb-1.0-dev
+ install build-essential
+ in a shell, type:

`make`

## **To run:**

+ connect your device via USB to your computer
+ in a root shell, type:

`./accuchek > samples.json`

+ blood glucose levels should be in file samples.json
+ if it didn't work see "a number of things can go wrong" below

## **What it does:**

+ scans all USB devices in the system
+ finds an Accu-Chek Guide device if there's one
+ connects to it
+ downloads all blood glucose samples
+ dumps them as JSON on stdout
+ hopefully exit gracefully

## **Of interest:**

+ This has been tested on Ubuntu 20.04. On other Unixes, YMMV.

+ The file config.txt contains the USB id's of supported devices.
  If you have a slightly difference device that may work with this
  code, add its parameters (found in the output of lsusb) to the
  file and see if it works. Please submit a PR of it does.

+ This is a rough first cut, improvements via PRs are welcome.

+ Unless you enjoy futzing around with udev and the like, you
  should run the utility as root

+ Produced JSON has glucose levels in both mg/dL and mmol/L units

+ The ascii timestamps in JSON are expressed in the local device time

+ The epoch timestamps in JSON are GMT, assuming the computer running
  the utility is set to the same timezone as the Accu-Chek device.

+ The proprietary USB protocol needed to talk to the device was
  reverse-engineered from the Javascript code found here the author
  of which likely had access to the vendor documentation:

https://github.com/tidepool-org/uploader/tree/master/lib/drivers/roche

+ The JS code has a little more functionality (eg it can set the device
  time), but as much as I can ascertain, it's not particularly portable:
  it only runs on top of Chrome, and even there, I have never really
  managed to get it to run on anything but windoze: the amount of dependencies
  you have to install to ever hope to see it run is simply frightening.

+ A number of things might go wrong with this code. When that happens:

+ disconnect device USB cable
    + kill the utility
    + re-connect device USB cable
    + make sure it says "**data transfer / transferring data**" on the device screen
    + type in a root shell: `export ACCUCHEK_DBG=1`
    + from the same shell, run the utility again to see what the problem is

accuchek

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