Nightscout Sisensing CGM Uploader

Script written in python to periodically upload Sisensing (SiBionics) CGM (CG1) glucose data to Nightscout.

*Only tested with the Chinese models and API. A Chinese mobile number is required for signing up.

Model Tested:

• A4 (Original. Double packaging)
• A4 2024-05 (Second model. Single packaging)

App Tested:

• 硅基动感

Configuration

The script takes the following environment variables

Variable	Description	Example	Required
ss_token	Sisensing API Bearer Token	abcdefgh-1234-ijkl-5678-mnopqrstuvwx	X
ss_region	Sisensing Region (CN/EU)	CN
ns_url	Hostname of the Nightscout instance with http:// or https:// and end with /	https://nightscout.azurewebsites.net/	X
ns_api_secret	SHA1 Hash of Nightscout access toke	162f14de46149447c3338a8286223de407e3b2fa	X
uploader_interval	The time interval of requesting values from Sisensing. Default to 5 mins as Sisensing CGM only uploads every 5 mins.	5
uploader_max_entries	Maximum number of entries to upload everytime. 0 to disable.	0
uploader_all_data	Upload all available data.	False

IMPORTANT for Azure free tier users

Enable server side retry to prevent rate-limiting errors for Azure Cosmos DB for MongoDB operations. Follow link below for details. https://learn.microsoft.com/en-us/azure/cosmos-db/mongodb/prevent-rate-limiting-errors

Obtain Sisensing API Bearer Token

• Use your main phone the master device and log in with the main device mode to read data from CGM.
• Use your spare phone and log in as follower mode to retrieve history data stored on the server.
• Install a packet capture app on your spare phone. eg. Http traffic capture for iOS. PCAPdroid for andriod.
• Install the required certificate per the packet capture app instruction.
• Scan Sisensing app on your spare phone.
• Find an entry matching the API address. (ie. api.sisensing.com/follow/app/follow/myself/glucose/details/devices for CN server)
• Under Response json file, you should see a list of glucose entries. Congrats. You find the correct one.
• Under Request header, find Authorization:Bearer .... "..." is your ss_token.
• If Sisensing app is reinstalled or logged in on another device with the same phone number, you may need to repeat the above step.

Hashing Nightscout API token

ns_api_secret must be a SHA1 hash of an Access Token from Nightscout (Add new subject first in Nightscout's Admin Tools if required), e.g. your Access Token for a subject named Sisensing might be sisensing-123456789abcde.

Obtain your hash with

echo -n "sisensing-123456789abcde" | sha1sum | cut -d ' ' -f 1

(use shasum instead of sha1sum on Mac)

which will print the hash (40 characters in length):

14c779d01a34ad1337ab59c2168e31b141eb2de6

You might also use an online tool to generate your hash, e.g. https://codebeautify.org/sha1-hash-generator

Deployment - Docker

Docker Hub https://hub.docker.com/r/imlovinit1019/nightscout-sisensingcgm-uploader

• API secret and token are passed as Environment Variables. If you have security concerns, please stop using this script or fork this repository to make improvements. (Docker swarm mode may be required to use secrets.)

Credit

Inspired by https://github.com/timoschlueter/nightscout-librelink-up