Feature: Using Nightscout as CGM data source

[Andrei0105]

Some CGMs don't support connecting to Loop and the easiest way to do this is to upload their data to Nightscout and retrieve it from there.
This was already discussed in #84, but this does not consider CGMs that are not compatible with xDrip+.
It also seems that this was possible in Loop v1.4.0 (#535, #492) but it's not possible currently.

I created a pull request (LoopKit/dexcom-share-client-swift#9) in https://github.com/LoopKit/dexcom-share-client-swift that allows the user to use his own Dexcom share server. This can be used with https://github.com/dabear/NightscoutShareServer to retrieve data from Nightscout.

How to use this feature as of now:

• Set up a Nightscout site for your CGM
• Follow the instructions in https://github.com/dabear/NightscoutShareServer to set up a Nightscout Share Server
  NOTE: NightscoutShareServer is no longer supported by the original author. You can get the last working version from here: https://github.com/Andrei0105/NightscoutShareServer, but this is not currently being maintained (although I plan to in the future).
• Fork https://github.com/Andrei0105/dexcom-share-client-swift https://github.com/LoopKit/dexcom-share-client-swift and follow the instructions in ShareClient/ShareClient.swift: uncomment line 44 in ShareClient/ShareClient.swift, add the URL of your Nightscout share server and uncomment lines 34 and 35 in ShareClientUI/ShareService+UI.swift
• Fork both https://github.com/LoopKit/G4ShareSpy and https://github.com/LoopKit/CGMBLEKit
• In both the above repositories update the Cartfile the following way: change github "LoopKit/dexcom-share-client-swift" ~> 1.2 to github "yourgithubusername/dexcom-share-client-swift" "master", where yourgithubusername is the username of the github user you used to fork the repos
• Delete the Cartfile.resolved files
• Back in the Loop folder, in the Cartfile change the lines github "LoopKit/CGMBLEKit" ~> 3.2 and github "LoopKit/G4ShareSpy" ~> 1.1 to github "yourgithubusername/CGMBLEKit" "master" and github "yourgithubusername/G4ShareSpy" "master"
• Also change the line github "LoopKit/dexcom-share-client-swift" == 1.2 in Cartfile to github "yourgithubusername/dexcom-share-client-swift" "master"
• Delete the Cartfile.resolved file from the Loop folder
• Build the Loop app. Now the option to select a custom share server should appear in Add CGM -> Dexcom Share

What is this useful for:
I have the Medtronic Guardian Connect standalone CGM which connects directly to my iPhone and data is retrieved from the Carelink portal and uploaded to Nightscout. The CGM can't be connected in any other way so this is the only solution to use it with Loop. I'm assuming there are more systems that can be used this way.

[Kdisimone]

#84 duplicate

[miriamkw]

Hello! I have followed this guide through, but every time i try to build Loop after I made the changes to the Cartfile, the Cartfile automatically resets the changes I have done. You know why this is?

[Andrei0105]

Hello! I have followed this guide through, but every time i try to build Loop after I made the changes to the Cartfile, the Cartfile automatically resets the changes I have done. You know why this is?

Hi! Can you please post the contents of the cartfile before you edit and after you edit it. Also, are you using the master branch?
Are you sure that you are updating Cartfile and not Cartfile.resolved? Can you delete Cartfile.resolved, update Cartfile, and try to build again?

[miriamkw]

Hi! Can you please post the contents of the cartfile before you edit and after you edit it. Also, are you using the master branch?
Are you sure that you are updating Cartfile and not Cartfile.resolved? Can you delete Cartfile.resolved, update Cartfile, and try to build again?

1: I find two Cartfiles with the line from the guide. One in Carthage⁩/Checkouts⁩/G4ShareSpy and one in Carthage⁩/Checkouts⁩/CGMBLEKit. They are identical, and I change both of them. Before:

github "LoopKit/LoopKit" ~> 3.0
github "LoopKit/dexcom-share-client-swift" ~> 1.2

After:
github "LoopKit/LoopKit" ~> 3.0
github "miriamkw/dexcom-share-client-swift" "master"

2: I am not in any branch because i downloaded the source code locally to my computer from Loopdocs: https://loopkit.github.io/loopdocs/build/step13/.

3: Tried to delete Cartfile.resolved and build but the same happened.

Thank you so much for answering so quickly!

[Andrei0105]

1. When you downloaded the source code did you choose Loop: Master branch or Loop: Dev branch? I didn't test this on Dev, so you should download Loop: Master.
2. You are not editing the right Cartfile. The Cartfile you should be editing is located at the top level of the source directory you downloaded. Pictured below:
   
   Since a new version of dexcom-share-client was released, the line you should be changing now is github "LoopKit/dexcom-share-client-swift" ~> 1.2.
   After this you should delete Cartfile.resolved (from the same directory where the Cartfile you edited is located), and build again.
3. To check that your changes were applied look at the Cartfile.resolved contents after the build. You should have a line like this:
   github "miriamkw/dexcom-share-client-swift" "[some hash]"

Please try this, and if you still have problems paste your Cartfile.resolved (the one generated after the build) here.

[miriamkw]

The version I had downloaded was Loop-master, but to me the Cartfile in the root didn't contain the mentioned line. So I cloned the project from Git instead, and edited the Cartfile.

When I built it the changes stayed, but the Cartfile.resolved remained the same. Deleting the Cartfile.resolved before building solved the problem.

Now my problem is that my Glucose levels do not start appearing in my Loop app. The username and password should not matter, right? I have already

• checked that my integration against nightscout is working (from my NightscoutShareServer)
• verified that I have made the changes to the forked dexcom-share-client-swift
• verified that I chose the "custom" from CGM --> Dexcom Share in the app

Can the problem be that in my branch of dexcom-share-client-swift I made the changes directly in Github? It says that "CompareThis branch is 2 commits ahead of Andrei0105:master". Do I have to clone the repository and push the changes?

[Andrei0105]

I checked your branch and it seems fine. You are right that the username and password don't matter. It usually takes 5-10 minutes for the first glucose values to appear.
Did you tap Add account before tapping Save when you have to add a Dexcom Share account in Loop? If you don't click Add account then your credentials will be saved and it will look like everything is set up correctly but actually the account is not enabled in Loop.
If after you click Add account you don't get any error it means that Loop connected successfully to your Share Server.

[miki3421]

I have the same problem, I did everything but in the heroku logs i'm not receiving calls to the webserver. UI is perfect and without errors. The only way that is found to receive only one call is:
try to configure a Dexcom Webserver US for example and after try again the custom. In that case I can see in the log the Authentication request and the first Glucose request, but nothing else after. Even if i'm leaving running hours this configuration. Thanks

[miriamkw]

Even when I added account like you illustrated @Andrei0105 , it still didn't work. But now suddenly the option "Custom" disappeared again. I have tried restart the computer, update xCode, clean and build but nothing works. Now I suspect all my errors appear because I have the same project in several repositories.

Will update when i figure out more. Thank you so much for the help so far.

[Andrei0105]

Hi! I don't think the problem is from your shareserver since it seems to be working fine. If the following solution does not work, I can test with your URL and see if the shareserver works properly.

Now, to try another solution:

• Fork both https://github.com/LoopKit/G4ShareSpy and https://github.com/LoopKit/CGMBLEKit
• Perform the same change to the Cartfiles as you did for the Cartfile in the Loop folder (change github "LoopKit/dexcom-share-client-swift" ~> 1.2 to github "miriamkw/dexcom-share-client-swift" "master")
• Delete the Cartfile.resolved files
• Back in the Loop folder, in the Cartfile change the lines github "LoopKit/CGMBLEKit" ~> 3.2 and github "LoopKit/G4ShareSpy" ~> 1.1 to github "miriamkw/CGMBLEKit" "master" and github "miriamkw/G4ShareSpy" "master"

Then build the application. To check that the changes have been applied, check Cartfile.resolved. The line github "LoopKit/dexcom-share-client-swift" "v1.2" should no longer be in there.

[miriamkw]

Update:
It is finally working, since 5 minutes ago! I am not completely sure what made it work, but after I added the insulin pump, I deleted the CGM and added it all over again, and it started working.

Checklist for people that might meet the same problem:

• Be sure you have Bluetooth on
• Be sure Nightscout is having connection with your sensor
• I use Tomato app, and this has to be running on the iPhone
• And of course, this system requires that you have an Internet-connection

I am greatful for this solution, as this is my only opportunity to be able to Loop (Freestyle Libre 2 x Omnipod x iPhone). Thank you again!!

[Andrei0105]

Great! I'm happy it's finally working.
With the Freestyle Libre I think you can use Spike and this will not need an internet connection (I'm not sure but I'll switch to the Libre in less than 2 weeks and I was hoping to not need internet anymore).

As a sidenote: If you have both Nightscout and ShareServer running on the same Heroku account you will probably exceed the 1000 free dyno hours per month. You can run the ShareServer in Azure and thus avoid having to pay for a dyno in Heroku. The ShareServer has a Deploy to Azure option which makes setting it up very easy.

[miriamkw]

Spike does not yet support Freestyle Libre 2, so if you have the opportunity I would recommend Libre 1. I hope it will be available for Libre 2 soon, though.

Oh, I did not notice this limit. I ran into trouble with the setup of Azure but I will try again. Thanks!

[miki3421]

Thanks @miriamkw .
i think mine is not working because i'm using the simulator as a Pump.
i can't connect the Omnipod so i'm using "manually"
@Andrei0105 do you think can be this the case for my issue?
Thanks

[miriamkw]

Thanks @miriamkw .
i think mine is not working because i'm using the simulator as a Pump.
i can't connect the Omnipod so i'm using "manually"

Maybe try to go to Settings --> Loop and give Loop app access to Bluetooth?

I cannot understand that the CGM is dependent on being connected to a real insulin pump. But when I connected to the OmniPod Loop asked me for the access to BlueTooth, so that might have made the difference?