Nightscout LibreLink Up Uploader/Sidecar

Simple Script written in JavaScript (Node) that uploads CGM readings from LibreLink Up to Nightscout. The upload happens every minute and should work with at least Freestyle Libre 2 and Libre 3 CGM sensors.

for test version click here:

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
NIGHTSCOUT_URL	Hostname of the Nightscout instance (without https://)	nightscout.yourdomain.com	X
NIGHTSCOUT_API_TOKEN	SHA1 Hash of Nightscout access token	162f14de46149447c3338a8286223de407e3b2fa	X
TRANSFER_AGGREGATED_DATA_ONLY	upload only 5 minute aggregated data, true/false	true

Usage

There are different options for using this script.

Variant 1: On Heroku

• Click
• click to deploy test version
• 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 startetd 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 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)

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 NIGHTSCOUT_URL="nightscout.yourdomain.com" \
            -e NIGHTSCOUT_API_TOKEN="librelinku-123456789abcde" 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:

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"
      NIGHTSCOUT_URL: "nightscout.yourdomain.com"
      NIGHTSCOUT_API_TOKEN: "librelinku-123456789abcde"

ToDo

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