Adopt
iOS mobile SDK. Native platform engineering. MVVM and Clean Architecture are the target architectural patterns — keeping the rPPG camera capture layer cleanly separated from business logic and UI.
IEC 62304 §5.3 (software architectural design) and §5.4 (detailed design) apply to the iOS SDK components. IEC 62366-1 (usability engineering) applies to the B2B SDK integration surface — the developer experience for partner apps is a regulatory concern, not just a commercial one. See Layer 12 (Mobile Architecture).