The REDCap module's page code, running outside REDCap so it can be tested against a real BP+.
Test harness → A flat stand-in for the instrument: one set of controls, conformance checks, the cuff-pressure trace and the SDK self-test. Visit harness → The aobp_visit instrument as the data dictionary describes it: seated and standing as two blocks on one page, with branching on sys_standing_required.