Feature/betacell plugin

[Dti-1]

No description provided.

[sonarqubecloud]

Quality Gate failed

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[Philoul]

Target branch for PRs should never be master but dev

No description provided? Can you explain the feature, provide screenshots, explain how it works...

Several critical files are modified so you should describe impact on loop and APS calculation 😉.

[Dti-1]

Hi, Thank you for the review feedback — all three points are addressed below.

…

--- **1. Target branch** Apologies for targeting master. The PR has been rebased onto dev and the target branch updated accordingly. All three feature branches (feature/betacell-plugin, feature/betacell-sigmoid, feature/wear-medtrum-standalone) have been migrated from master to dev.

--- **2. Feature description** BetaCellPlugin is a new APS algorithm that models the insulin secretion behaviour of a healthy pancreatic β-cell in response to CGM readings. Two selectable calculation modes via the `useNonLinear` preference: • Linear (default): β = (BG − target) / ISF × dt Proportional to the glucose gap — predictable, easy to validate in open loop. • Sigmoid²+CaState: β = maxSecretion × σ²(BG) × Ca²⁺ × dt Non-linear response with intracellular calcium memory (caState), closer to real β-cell physiology. The plugin is disabled and set to open-loop-only by default (betacell_open_loop_only = true). No insulin is delivered until explicitly enabled by the user.

--- **3. Impact on loop and APS calculation** APS pipeline (every 5-minute cycle): invoke() ├─ IsfCalibrator — rolling SD of bgReadings → dynamic ISF [isfMin, isfMax] └─ calcBetaSecretion() ├─ Guard 1: bg < hypoBg → rate=0, smb=0 (absolute, hardcoded floor 55 mg/dL) ├─ Guard 2: bgIn30min < hypoAlert → rate=0, smb=0 (predictive: projection + IOB + slope) ├─ basalFactor [0.0→1.0] — smooth gradient near hypo threshold ├─ recentBolus guard (<3 min) → SMB suspended (IOB DB write latency) └─ switch useNonLinear → calcLinear() or calcNonLinear() IOB: uses native AAPS calculateIobFromBolus() + calculateIobFromTempBasals() with full DIA curve — no custom IOB model in the loop path. IobTotal.lastBolusTime is used for the bolus latency guard. SMB conditions (6 guards, both modes): smbEnabled && !recentBolus && bg > targetBg+offset && bg < hyperBg && bgIn30min > hypoAlert && iobTotal < smbMax×3 Files modified in existing AAPS code: • BooleanKey.kt / DoubleKey.kt / IntKey.kt — new betacell_* preference keys only, no existing key affected • ApsModule.kt — +1 Fragment binding, no existing binding changed • PluginsListModule.kt — +1 plugin binding at unused @IntKey(222) All new keys use the betacell_ prefix. The plugin is disabled by default and cannot affect the loop unless explicitly selected in Config Builder. Please let me know if you need any additional information. Best regards Le mer. 18 mars 2026 à 21:58, Philoul ***@***.***> a écrit :

*Philoul* left a comment (nightscout/AndroidAPS#4592) <#4592 (comment)> Target branch for PRs should never be master but dev No description provided? Can you explain the feature, provide screenshots, explain how it works... Several critical files are modified so you should describe impact on loop and APS calculation 😉. — Reply to this email directly, view it on GitHub <#4592 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/BCZA5DJXTXFZGDGQ47KDZIT4RMLYPAVCNFSM6AAAAACWMFTLV2VHI2DSMVQWIX3LMV43OSLTON2WKQ3PNVWWK3TUHM2DAOBVHAYTIMZQHA> . You are receiving this because you authored the thread.Message ID: ***@***.***>