nRF54L15 Channel Sounding with iOS 27 Beta2

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

san lingyr — Wed, 21 Oct 2026 02:37:21 GMT

Excuse me, may I ask if you've resolved this issue yet?

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Fri, 17 Jul 2026 06:44:14 GMT

Thanks your reply.

I think we are encountering basically the exact same error, so which region version is your iPhone?

I see many examples that successfully achieved channel sounding ranging recently , so I'm quite confused about where exactly the problem is occurring.However, from Apple's release, I also didn't find any statement mentioning region restrictions for the Channel Sounding function.

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Yanc — Fri, 17 Jul 2026 06:33:43 GMT

I compiled the latest sample ipt_reflector with command

west build -bnrf54l15dk/nrf54l15/cpuapp -- -DEXTRA_CONF_FILE="ios_ranging.conf"

The CS app is from the link . I checked the CS available with the code

func centralManagerDidUpdateState(_ central: CBCentralManager) {
        switch central.state {
        case .poweredOn:
            print("central update")
            if CBCentralManager.supports(.channelSounding) {
                print("Supports channel sounding - YES")
            } else {
                print("Supports channel sounding - NO")
            }
            if let id = pendingPeripheralIdentifier, let name = pendingPeripheralName {
                pendingPeripheralIdentifier = nil
                pendingPeripheralName = nil
                retrieveAndConnect(identifier: id, name: name)
            }
        case .poweredOff:   connectionState = .bluetoothOff
        case .unauthorized: connectionState = .error("Bluetooth not authorized — check Settings")
        case .unsupported:  connectionState = .error("BLE not supported on this device")
        default:            break
        }
    }

The console log shows

[ASK] Session activated — accessories: 1
central update
Supports channel sounding - NO
[CS] startChannelSounding skipped — channelSounding not supported

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Fri, 17 Jul 2026 06:10:11 GMT

Hi Yanc,

Has your problem been solved? Is there really a regional restriction?

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Wed, 08 Jul 2026 08:22:30 GMT

Hi ivan,

there was only a successful case:nRF54L Channel Sounding on iOS 27 Beta - Nordic Q&A - Nordic DevZone - Nordic DevZone.

Regards,

Clever H

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

ivan iushkov — Wed, 08 Jul 2026 06:57:27 GMT

> I suspect this might be a regional restriction imposed by Apple on iOS.

I think it might be the case.

Can you try to check if CS is available on your device using the guide here?

https://developer.apple.com/documentation/nearbyinteraction/nidevicecapability/supportsbluetoothchannelsounding#discussion

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Wed, 08 Jul 2026 02:30:17 GMT

Hi ivan，

This is a new log data file.

Additionally, we noticed the release of iOS 27 beta 3, which fixed Core Bluetooth, and we also plan to update and give it a try.

Have you successfully established ranging using the iOS app and example? If possible, could you please share the detailed information you used? (For example, which example, which app, board model, etc.).

devzone.nordicsemi.com/.../ios-27-beta-2-pklg.pklg

Regards,

Clever H

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Yanc — Wed, 08 Jul 2026 01:31:59 GMT

Could you please upload the compiled zephyr.hex for the sample ipt_reflector?

I encountered the same issue as Huang.

My test phone: iPhone 17 with iOS 27 beta3
Board: nRF54L15 DK.

I suspect this might be a regional restriction imposed by Apple on iOS.

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

ivan iushkov — Tue, 07 Jul 2026 13:46:55 GMT

I am not exactly sure what happens there.
Can you try to clear Bluetooth cache on iPhone completely and also clear bonding information on the DK and try from scratch?

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Tue, 07 Jul 2026 10:21:05 GMT

Hi ivan，

the file is the log from the phone.

devzone.nordicsemi.com/.../ios27-beta-2.pklg

Regards,

Clever H

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

ivan iushkov — Tue, 07 Jul 2026 09:57:01 GMT

can you collect hci trace from the phone side and send them in .pklg format please?

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Tue, 07 Jul 2026 08:08:04 GMT

Hi ivan，

Thanks your reply.

The Phone ：iPhone 17 Pro

Board: nRF54L15 DK.

Regards,

Clever H

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

ivan iushkov — Tue, 07 Jul 2026 07:46:08 GMT

what phone are you using in those tests?

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Tue, 07 Jul 2026 02:13:31 GMT

Hi ivan，

Thank you very much for your prompt reply. I have already tried compiling with this latest application, but I still cannot successfully establish ranging. May I ask if the app on iOS needs any modifications? I directly used Apple's demoMeasuring distance between devices using Channel Sounding | Apple Developer Documentation. Below are the error details on ios：.

[CS] NI startChannelSoundingSession — peripheral: Nordic CS IPT Reflector with camera assistance
[CS] NISession being invalidated — error: Error Domain=com.apple.NearbyInteraction Code=-5887 "NIERROR_SESSION_FAILED_DESCRIPTION" UserInfo={NSLocalizedRecoverySuggestion=NIERROR_SESSION_FAILED_RECOVERY_SUGGESTION, NSLocalizedDescription=NIERROR_SESSION_FAILED_DESCRIPTION, NSLocalizedFailureReason=NIERROR_SESSION_FAILED_FAILURE_REASON}

Looking forward to your further reply. Thank you very much!

Regards,

Clever H

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

ivan iushkov — Mon, 06 Jul 2026 12:31:20 GMT

in the main-branch of NCS you can also try using the ios_ranging.conf fragment when testing with iOS, as described here:

github.com/.../README.rst

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Amanda Hsieh — Fri, 03 Jul 2026 12:46:49 GMT

The modification is in this post, and you should be aware of the AccessorySetupFramework requirement/restriction as mentioned earlier.

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Clever Huang — Fri, 03 Jul 2026 01:50:38 GMT

hi，

thanks for your reply.

I am using Apple's demo for this. At the same time, I saw this post: nRF54L Channel Sounding on iOS 27 Beta - Nordic Q&A - Nordic DevZone - Nordic DevZone, so I started trying it. What I want to know is, specifically

how should the firmware be modified? Or what adaptations need to be made on the app side?

Looking forward to your further reply. Thank you very much!

Regards,

Clever H

RE: nRF54L15 Channel Sounding with iOS 27 Beta2

Amanda Hsieh — Thu, 02 Jul 2026 12:45:46 GMT

Hi Clever,

Channel Sounding does not work if the device has not been set up by Apple's AccessorySetupKit framework, as stated in the documentation here: Measuring distance between devices using Channel Sounding | Apple Developer Documentation

The best way to see how that works is to follow Apple's own sample code/project for Channel Sounding (same as the above link).

Unfortunately, as of now it seems like Apple is not going to allow Bluetooth LE-scanning apps to do Channel Sounding. We have asked Apple directly about this; it's really unfortunate.

Regards,
Amanda H.