This script written in TypeScript facilitates the upload of CGM (Continuous Glucose Monitoring) readings from LibreLink Up to a server that uses FHIR(Fa). It is designed to work with at least Freestyle Libre 2 (FGM) and Libre 3 CGM sensors. The original idea and initial code structure are derived from the nightscout-librelink-up repository within the DIY communities.

Official documentation regarding data sharing can be found at LibreLinkUp Getting Started.

The table below lists the environment variables used in the application:

This script provides different options for usage.

Run the demo script by executing the following command from the root folder after downloading the .zip file or cloning the repository.

For Linux/macOS:

# Make the script executable
chmod +x start-demo.sh

# Execute the script
./start-demo.sh

To execute this script in Windows:

1. Open Command Prompt (cmd).
2. Navigate to the directory where the script is saved.
3. Run the script by typing its name start-demo.bat and pressing Enter.

This will:

1. Initiate the process and observe the output in the console.

2. The FHIR bundle files will be available in the following folder: Demo/Data

3. Execute the script (./start-demo.sh) to initiate the process and observe the output in the console.

4. You will find the files that represent the FHIR bundle at the following folder: Demo/Data

Running the Real-time Script. It's very important that you replace the following vairable:

• LINK_UP_USERNAME="your_librelinkup_username"

• LINK_UP_PASSWORD="your_librelinkup_password"

To run the real-time script, follow these steps:

• Clone the repository to your local machine:

git clone https://github.com/pra008/Libre-link-up-FHIR

• Navigate to the project directory:

cd Libre-link-up-FHIR

• Run the following code, for Linux/macOS:

export DEMO_ENABLED="false"
export LOG_LEVEL="info"
export LINK_UP_USERNAME="your_librelinkup_username"
export LINK_UP_PASSWORD="your_librelinkup_password"
export LINK_UP_TIME_INTERVAL="5"
export FHIR_ID="your_fhir_id"
export FHIR_URL="your_fhir_server_url"
export TOKEN_ENDPOINT="your_token_endpoint"
export CLIENT_ID="your_client_id"
export CLIENT_SECRET="your_client_secret"
npm install
npm start dev

Remember to replace also your_fhir_id, your_fhir_server_url, your_token_endpoint, your_client_id, and your_client_secret with your actual values.

• Run the following code, for Windows:

REM Required environment variables for the demo
set "DEMO_ENABLED=false"
set "LOG_LEVEL=info"
set "LINK_UP_USERNAME=your_librelinkup_username"
set "LINK_UP_PASSWORD=your_librelinkup_password"
set "LINK_UP_TIME_INTERVAL=5"
set "FHIR_ID=your_fhir_id"
set "FHIR_URL=your_fhir_server_url"
set "TOKEN_ENDPOINT=your_token_endpoint"
set "CLIENT_ID=your_client_id"
set "CLIENT_SECRET=your_client_secret"

npm install
npm start demo

Create a .env file in the root directory of the project.

This file will contain the required environment variables. Here's an example of the .env file:

LOG_LEVEL=info
DEMO_ENABLED=true
FHIR_ID=your_fhir_id
FHIR_URL=your_fhir_server_url
TOKEN_ENDPOINT=your_token_endpoint
CLIENT_ID=your_client_id
CLIENT_SECRET=your_client_secret

Add other variables as needed, and replace your_fhir_id, your_fhir_server_url, your_token_endpoint, your_client_id, and your_client_secret with your actual values.

• Run the demo script by executing the following command:

npm install

and then run:

npm start dev

This will start the demo version of the script using the configured environment variables in the .env file.

Remember to set the necessary environment variables according to your setup before running the script. You can modify the .env file with your specific values for the environment variables required by the script.