Solution
- Design-thinking & architecture sprint
Mapped every user role (cardiologist, CRC, firmware, QA) → defined a BLE Transport SDK independent of UI.
- Modular BLE SDK (Kotlin / Swift)
- Connection manager negotiates MTU, PHY, and interval per phone model.
- Fragmentation & reassembly layer joins variable-length packets and checks CRC-16.
- Version-adaptive decoder reads a 1-byte payloadVersion header and loads a JSON schema, enabling backward / forward compatibility.
- SDK exposes Rx-style streams so any future app can subscribe with three lines of code.
- Native UI apps on top of the SDK
- Real-time dashboard with ECG.
- Offline cache: Hours of encrypted SQLite storage with loss-tolerant auto-sync (Wi-Fi / GSM).
- Clinician marker tool lets doctors tag arrhythmia events during live hookup.
- Comprehensive compatibility test matrix
Automated device farm ran 510 regression cases across:- Android 8.0 → 15, BLE 4.2 → 5.4
- iOS 9 → 17, BLE 4.2, 5.0, 5.2, 5.4
- Test layers: connection, fragment / recomb, post-processing, CRC, application logic.
Features and Value add
Features (apps + SDK)
- Loss-tolerant BLE streaming
- Live multi-param dashboard (ECG, RR, HR, SpO₂, Temp).
- Arrhythmia & symptom tagging with timestamped notes.
- Offline buffer & auto-sync
- Version-aware packet decoder — add new sensor fields without app update.
- Connection diagnostics screen — RSSI, MTU, packet-gap counter.
- SDK re-use — future MCT or RPM apps just plug new UI atop the same transport.
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