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iOS cancels nothing for us: pending CBCentralManager connects never expire, complete whenever the peer reappears in range, and relaunch the app via the existing state-restoration path. Use that as the wake-on-proximity mechanism: - BLERecentPeripheralCache: retains handles to recently seen/dropped peripherals (LRU 16, 15 min max age to respect BLE address rotation) - On backgrounding, arm indefinite pending connects to cached peripherals within a slot budget (2 of 6 central slots reserved for live background discovery); armed entries carry lastConnectionAttempt == nil so a quick background/foreground bounce can't strand them as connecting - The 8s app-level connect timeout defers while backgrounded so discovery-driven background connects also stay pending - Foreground return cancels stale pending connects (including connecting entries rebuilt by state restoration after a relaunch) and hands control back to the scanner/scheduler - A link dropped while backgrounded re-arms after the disconnect-settle window, so a peer walking away and returning wakes us again - Packet ingress while backgrounded triggers a catch-up maintenance pass (announce/flush/drain) since the maintenance timer is suspended with the app; rate-limited to the normal 5s cadence Battery cost ~0: pending connects live in the controller's allowlist (no scanning, no app CPU), and the catch-up pass only runs inside wake windows the radio already granted. Co-authored-by: jack <jackjackbits@users.noreply.github.com> Co-authored-by: Claude Fable 5 <noreply@anthropic.com>