Remote Service Basal Totals exceed that reported in Apple Health

[marionbarker]

Describe the bug The reported basal total for each day exceeds that reported in Apple Health for both Tidepool and Nightscout.

Comment:

• It was a known issue for a long time that Nightscout Basal totals were not reliable, however, this seems to be fixed with Loop 3.3.0 (commit 6b7bba6) and Nightscout 15.0.2
• The daily basal discrepancy noted with Tidepool is identical to the discrepancy noted with Nightscout when comparing both to the Apple Health records

Additional context This was discovered when demonstrating that the Tidepool data does not include non-pump insulin. (See #2024).

This spreadsheet compares reported values in Apple Health, Tidepool and Nightscout.

In addition to the Tidepool website not including the non-pump insulin, both remote services do not agree with Apple Health regarding daily basal. The discrepancy is the same for (almost) every day and the sign is always the same - indicating a systematic offset.

Remote and AH Records

The build commit is: 6b7bba6, running on an iOS 17.1.1 phone using DASH, G6, uploading to Tidepool and Nightscout from Loop

[github-actions[bot]]

This issue is stale because it has been open for 30 days with no activity.

[github-actions[bot]]

This issue was closed because it has been inactive for 14 days since being marked as stale.

[marionbarker]

This should be reopened.

[marionbarker]

I repeated this test where I recorded daily amounts for basal and bolus as reported in these sources and updated the spreadsheet Remote and AH Records with a new tab ("Jan 2024 dev AH TP NS Pods"):

1. Apple Health (fed by Loop)
2. Tidepool (remote upload by Loop, client that displays results)
3. Nightscout (remote upload, client that displays results)
4. Pod 0x1d message to extract total daily insulin (this is "truth" for what pod delivered)

In summary:

• Apple Health (1) and Pod records (4) match as expected (some deltas but they are small and average to 0)
• Bolus records match for 1, 3 and 4 but non-pump insulin is not reported for Tidepool (see Issue #2024)
• Basal records for both remote sites (2 & 3) Tidepool and Nighscout report more daily basal than Loop/AppleHealth
  • every day the discrepancy in the same direction
  • on days with higher insulin needs, the discrepancy is bigger
  • the value reported by both Tidepool and Nightscout is identical, so I think the error probably lies within the remote upload code for Loop