Nightscout LibreLink Up Uploader/Sidecar

Script written in TypeScript that uploads CGM readings from LibreLink Up to Nightscout. The upload should work with at least Freestyle Libre 2 (FGM) and Libre 3 CGM sensors.

Configuration

The script takes the following environment variables

Variable	Description	Example	Required
LINK_UP_USERNAME	LibreLink Up Login Email	mail@example.com	X
LINK_UP_PASSWORD	LibreLink Up Login Password	mypassword	X
LINK_UP_CONNECTION	LibreLink Up Patient-ID. Can be received from the console output if multiple connections are available.	123456abc-abcd-efgh-7891def
LINK_UP_TIME_INTERVAL	The time interval of requesting values from libre link up	5
LINK_UP_REGION	Your region. Used to determine the correct LibreLinkUp service (Possible values: US, EU, DE, FR, JP, AP, AU, AE)	EU
NIGHTSCOUT_URL	Hostname of the Nightscout instance (without https://)	nightscout.yourdomain.com	X
NIGHTSCOUT_API_TOKEN	SHA1 Hash of Nightscout access token	162f14de46149447c3338a8286223de407e3b2fa	X
NIGHTSCOUT_DISABLE_HTTPS	Disables the HTTPS requirement for Nightscout URLs	true
LOG_LEVEL	The setting of verbosity for logging, should be one of info or debug	info
SINGLE_SHOT	Disables the scheduler and runs the script just once	true

Usage

There are different options for using this script.

Variant 1: On Heroku

• Click on
• Login to Heroku if not already happened
• Provide proper values for the environment variables
• Important: make sure that yor Nightscout API token is hashed with SHA1
• Click Deploy to deploy the app

Variant 2: Local

The installation process can be started by running npm install in the root directory.

To start the process simply create a bash script with the set environment variables (start.sh):

#!/bin/bash
export LINK_UP_USERNAME="mail@example.com"
export LINK_UP_PASSWORD="mypassword"
export LINK_UP_TIME_INTERVAL="5"
export NIGHTSCOUT_URL="nightscout.yourdomain.com"
# use `shasum` instead of `sha1sum` on Mac
export NIGHTSCOUT_API_TOKEN=$(echo -n "foo-bar-baz" | sha1sum | cut -d ' ' -f 1)
export LOG_LEVEL="info"

npm start

Execute the script and check the console output.

Variant 3: Docker

The easiest way to use this is to use the latest docker image:

docker run -e LINK_UP_USERNAME="mail@example.com" \
           -e LINK_UP_PASSWORD="mypassword" \
           -e LINK_UP_TIME_INTERVAL="5" \
           -e NIGHTSCOUT_URL="nightscout.yourdomain.com" \
           -e NIGHTSCOUT_API_TOKEN="librelinku-123456789abcde" \
           -e LOG_LEVEL="info" \
           timoschlueter/nightscout-librelink-up

Variant 4: Docker Compose

If you are already using a dockerized Nightscout instance, this image can be easily added to your existing docker-compose file. In this example, the region is set for germany ("DE"):

version: '3.7'

services:
  nightscout-libre-link:
    image: timoschlueter/nightscout-librelink-up
    container_name: nightscout-libre-link
    environment:
      LINK_UP_USERNAME: "mail@example.com"
      LINK_UP_PASSWORD: "mypassword"
      LINK_UP_TIME_INTERVAL: "5"
      LINK_UP_REGION: "DE"
      NIGHTSCOUT_URL: "nightscout.yourdomain.com"
      NIGHTSCOUT_API_TOKEN: "librelinku-123456789abcde"
      LOG_LEVEL: "info"

ToDo

• Integration into Nightscout: I have not yet looked into the plugin architecture of Nightscout. Maybe this should be converted into a plugin.