Space to collaborate on decoding Contour Next Link comms protocols, and the piggy-backed pump comms
- Make sure you have
pythonandpipinstalled - Clone this project
- Install the dependencies:
$ sudo -H pip install requests hidapi astm transitions PyCrypto crc16
- Plug in your Contour NextLink 2.4 USB stick
- Run
get_hmac_and_key.pyto get your HMAC and AES key for your USB stick serial number. This script takes one argument, which is your CareLink username. The script will also ask for your password - this is not echoed out or stored at all.
$ python get_hmac_and_key.py my_carelink_username
Enter the password for the CareLink user my_carelink_username:
HMAC for serial 1055866: e28fe4e5cf3c1eb6d6a2ec5a093093d4f397237dc60b3f2c1ef64f31e32077c4
KEY for serial 1055866: 57833334130906a587b7a0437bc28a69
Now whenever you run read_minimed_next24.py, the script will get the config from the config database and communicate with your pump.
$ python read_minimed_next24.py
# Opening device
Manufacturer: Bayer HealthCare LLC
Product: Contour Link USB Device
Serial No: 0000000001055866
# Request Device Info
# Read Device Info
6213-1055866
# Request Open Connection
# Request Read Info
# Negotiate pump comms channel
Negotiating on channel 20
Negotiating on channel 20
Negotiating on channel 17
Negotiating on channel 14
# Begin Extended High Speed Mode Session
# Get Pump Time
Pump time is: Sun, 01 May 2016 16:49:59 +0000
# Get Pump Status
Active Insulin: 0.450U
Sensor BGL: 340 mg/dL (18.9 mmol/L) at Sun, 01 May 2016 16:47:21 +0000
- Assumed pump time was in UTC, but this doesn't ring true for non DST times (in Melbourne, anyway)
- Currently uses
curses.ascii, which doesn't work on Windows.