The Issue
iOS 18 CoreBluetooth - scanForPeripherals method with a defined CBUUID is not able to detect iPhone peripherals advertising in the background state.
Setup
iPhone A (peripheral) - Advertising a service with a specific CBUUID myServiceUUID
iPhone B (central) - Scanning using the method sCentralManager.scanForPeripherals(withServices: [myServiceUUID])
Test Cases
iPhone B (with iOS 18) - detects iPhone A in the foreground state (app open in the foreground)
iPhone B (with iOS 18) - DOES NOT detect iPhone A in the background state (app in background; not terminated)
iPhone B (with iOS 17 and below) - detects iPhone A in both foreground and background states
NOTE: iPhone A could be any version of iOS
ahimsadas
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