Omnipod Dash Drift detection

[nl-ruud]

Basal Drift Detection for Omnipod Dash

Issue

The insulin delivered by the Omnipod Dash drifts from the programmed basal rate (related to #4158). This PR adds tracking to quantify the drift for future correction (will be a separate PR).

⚠️ First PR for AndroidAPS and GitHub.

Description

Add basal drift tracking to the Omnipod Dash driver.

Changes

• Separate basal and bolus delivery
  • Track bolus pulses separately
  • Calculate basal pulses: total pulses − bolus pulses
• Expected basal delivery calculation
  • Integrates expected delivery over time
  • Accounts for hourly basal rate changes and temporary basals
• Drift computation
  • basalDrift = actual − expected
  • Logged on each status update (DefaultStatusResponse and AlarmStatusResponse)

Example log

PUMP_BASAL act=8,10U (tot=33,25U bol=25,15U) exp=9,42U err=-1,32U dErr=-0,02U

Log fields:

Field	Description
act	Actual basal units delivered (tot − bol)
tot	Total units delivered
bol	Bolus units delivered
exp	Expected basal units delivered
err	Error / cumulative basal drift (act - exp)
dErr	Delta of err on this pump status response

New State Fields

• bolusPulsesDelivered: cumulative bolus pulses
• basalExpected: running total of expected basal delivery

New Computed Properties

• basalPulsesDelivered = total pulses − bolus pulses
• basalDelivered = basal pulses delivered converted to insulin units
• basalDrift = actual − expected insulin units (positive = over-delivery, negative = under-delivery)

Tests

• Confirmed basalDrift matches manual calculations
• Confirmed calculation on a temp basal change
• Confirmed calculation on a basal program change
• Validated calculations with Nightscout 'day to day' report: bolus insuline equals ΔbolusPulsesDelivered * 0.05, basal insuline is exactly ΔbasalDrift off from ΔbasalDelivered. Same difference between TDD and ΔtotalPulsesDelivered. QED.

[nl-ruud]

There was quite some code duplication between updateFromDefaultStatusResponse and updateFromAlarmStatusResponse that would become even more extensive. I moved the common denominator to a new private method updatePodState.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud