I'm trying to get Apple's new Bluetooth Channel Sounding distance measurement working between an iPhone running iOS 27 Beta and a Nordic nRF54L15-based board. The CS procedures appear to execute successfully over the air (Mode 0 + Mode 2 with Inline PCT), but the iOS sample app consistently returns 0 distance readings and occasionally throws Channel Sounding configuration failed. What specific validation does iOS 27 apply to CS results before surfacing them ? Are there known compatibility requirements for Nordic nRF54L15 with iOS Channel Sounding? (Nordic has indicated they're working on official support but have no timeline) Is there a publicly available hardware and/or firmware platform already available we can use to test? PacketLogger log nRF54L15 log