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Delve into the physical components of Apple devices, including processors, memory, storage, and their interaction with the software.

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iphone17 Core Bluetooth Background Execution Modes
Hello. Is there a solution to the issue where Core Bluetooth does not run in the background on the iPhone17? https://developer.apple.com/library/archive/documentation/NetworkingInternetWeb/Conceptual/CoreBluetooth_concepts/CoreBluetoothBackgroundProcessingForIOSApps/PerformingTasksWhileYourAppIsInTheBackground.html The bluetooth-central Background Execution Mode When an app that implements the central role includes the UIBackgroundModes key with the bluetooth-central value in its Info.plist file, the Core Bluetooth framework allows your app to run in the background to perform certain Bluetooth-related tasks. While your app is in the background you can still discover and connect to peripherals, and explore and interact with peripheral data. In addition, the system wakes up your app when any of the CBCentralManagerDelegate or CBPeripheralDelegate delegate methods are invoked, allowing your app to handle important central role events, such as when a connection is established or torn down, when a peripheral sends updated characteristic values, and when a central manager’s state changes. Although you can perform many Bluetooth-related tasks while your app is in the background, keep in mind that scanning for peripherals while your app is in the background operates differently than when your app is in the foreground. In particular, when your app is scanning for device while in the background: The CBCentralManagerScanOptionAllowDuplicatesKey scan option key is ignored, and multiple discoveries of an advertising peripheral are coalesced into a single discovery event. If all apps that are scanning for peripherals are in the background, the interval at which your central device scans for advertising packets increases. As a result, it may take longer to discover an advertising peripheral. These changes help minimize radio usage and improve the battery life on your iOS device.
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100
Sep ’25
Alternative to generate programmatically a local hotspot like in Android?
Hello, we are developing hardware that needs to connect to an iPhone via Wi-Fi to send requests to a server. On Android, we have managed to create a programmatic local hotspot within the app to facilitate connection and improve the user experience. On iOS, however, Personal Hotspot must be manually enabled from the system settings, and the user must manually enter the SSID and password, which significantly degrades the UX. My questions are: Is there a workaround, unofficial method, or private API to generate a local hotspot from an app on iOS, similar to what can be done on Android? Is there an alternative within the MFi program or through specific frameworks to facilitate a quick and automatic connection between the hardware and the iPhone without relying on the manual Personal Hotspot? Are there any best practices for improving the local Wi-Fi connection experience between an accessory and an iPhone in the absence of hotspot controls? I would appreciate any guidance, experience, or resources that would help me better understand the feasible options in iOS for scenarios where fast and direct communication between hardware and mobile devices via Wi-Fi is required. Translated with DeepL.com (free version)
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79
Oct ’25
CallKit Display and Audio Output Mismatch with Unintended UI Reversion
I'm building a React Native call application using the following combination of libraries: https://github.com/react-native-webrtc/react-native-callkeep https://github.com/react-native-webrtc/react-native-webrtc https://github.com/react-native-webrtc/react-native-voip-push-notification When I press the speaker button on the call screen displayed by CallKit and change it to ON, the speaker button display on the call screen reverts back to OFF after a few seconds. However, when the speaker button display reverts to OFF, the actual audio output route does not return to the earpiece - the audio continues to output from the speaker without any change. Could you please advise on what cases might cause the speaker button display to revert, and if there are any potential solutions?
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108
Oct ’25
My user can't pair bluetooth peripheral, due to device lost in SYSTEM BLUETOOTH PREPHERAL LIST
[sysdiagnose_2025.10.01_18-29-27+0800_iPhone-OS_iPhone_23A341] I got sysdiagnose from my app user.He can't pair his bluetooth peripheral. in the sysdiagnose,I found this: device AC:7A:94:85:47:F4 is already paired, with a different irk (old:F5 C9 4F 5A 4E BE D0 20 0A 1F F7 DC 3A 89 E0 3A new 4A 8A 00 4C FF D0 CE 7B 61 13 FA B3 84 F4 65 29 ). Unpair first and then restart pairing. (status=65535) but there is no device in his iphone's SYSTEM BLUETOOTH PREPHERAL LIST. I don't know how to delete the irk info when you can't find it in SYSTEM BLUETOOTH PREPHERAL LIST. PLEASE answer me. THANKS.
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Oct ’25
Why is CoreNFC unavailable from App Extensions (appex)? Any supported workarounds for authenticators?
Hi everyone — I’m developing an iOS passkey/password manager where the private key material must be stored on a physical device (NFC card / USB token). I’m hitting a hard limitation: CoreNFC is not available for use from app extensions, which prevents an appex (e.g. password/credential provider or other extension) from talking directly to an NFC card during an authentication flow.  My questions: 1. Is there any plan to make CoreNFC (or some limited NFC-API) available to app extensions in a future iOS version? If not, could Apple clarify why (security/entitlements/architecture reasons)? 2. Are there any recommended/approved workarounds for a passkey manager extension that needs to access a physical NFC token during authentication? (For example: background tag reading that launches the containing app, or some entitlement for secure NFC card sessions.) I’ve read about background tag reading, but that seems to be about system/OS handling of tags rather than giving extensions direct NFC access.  3. Is the only supported pattern for my use case to have the containing app perform NFC operations and then share secrets with the extension via App Groups / Keychain Sharing / custom URL flow? (I’m already evaluating App Groups / Keychain access groups for secure sharing, but I’d like official guidance.)  Implementation details that may help responders: • Target: iOS (latest SDK), building a Credential Provider / password manager extension (appex). • Intended physical token: NFC smartcard / ISO7816 contactless (so CoreNFC APIs like NFCISO7816Tag would be ideal). • Security goals: private key never leaves the physical token; extension should be able to trigger/sign during a browser/app AutoFill flow. Possible alternatives I’m considering (open to feedback): designing the UX so that the extension opens the main app (only possible for Today widget in a supported way) which runs the NFC flow and stores/returns a short-lived assertion to the extension. Are any of these patterns sanctioned / recommended by Apple for credential providers?  Thanks — any pointers to docs, entitlement names, or example apps/samples would be extremely helpful.
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Oct ’25
Since I updated my iPhone 13 to this new update I have two problems.
Since I updated my iPhone 13 to this new update I have two problems First: the battery discharges too fast or it gets stuck and doesn't discharge until I turn it off and turn it back on. Second: I see in my screen time a page that I had never seen is called imasdk.googleapis.com which I had never occupied and they tell me that it is a failure of the new update I hope you can help me fix that, since this mobile phone is new and already brings the faults by the ios
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93
Oct ’25
CoreNFC: NFCTagReaderSession fails with “Session invalidated unexpectedly” (after enabling NFC Scan, paid team, and custom dev profile)
Device: iPhone [model], iOS 18.6.2 Xcode: 16.0.x Team: Individual paid Apple Developer Program (not Personal Team), shows as my full name in Xcode I’m trying to use CoreNFC via NFCTagReaderSession in a small SwiftUI app (part of a larger project). So far I’ve done: • Enrolled in the Apple Developer Program (individual). • Confirmed that in Certificates, Identifiers & Profiles → Identifiers, my App ID for com.<…> has Near Field Communication Tag Reading enabled. • Created an iOS App Development provisioning profile for that App ID, including: • my Apple Development certificate • my iPhone device • Downloaded the profile, double-clicked it, and set it in Xcode under Signing & Capabilities with: • Team = my full-name team • “Automatically manage signing” off, using the custom profile. • Added the NFC Scan capability in Signing & Capabilities. • Added Privacy - NFC Scan Usage Description (NFCReaderUsageDescription) in Info.plist with a non-empty string. The app builds and runs on device. When I start the session: func beginScanning() { print("NFCTagReaderSession.readingAvailable =", NFCTagReaderSession.readingAvailable) session = NFCTagReaderSession(pollingOption: [.iso14443, .iso15693], delegate: self, queue: nil) session?.alertMessage = "Hold your iPhone near your Ori tag." session?.begin() } func tagReaderSession(_ session: NFCTagReaderSession, didInvalidateWithError error: Error) { print("NFC session invalidated:", error.localizedDescription) } readingAvailable is false, and I immediately see: NFC session invalidated: Session invalidated unexpectedly Earlier in this process I was seeing XPC sandbox messages like: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.nfcd.service.corenfc was invalidated: failed at lookup with error 159 - Sandbox restriction." Those went away after I created the explicit iOS App Development profile and pointed the target at it, but the session still invalidates right away and readingAvailable never becomes true. Safari can read NDEF URL tags on this device, so the NFC hardware is working. Question: Is there anything else required on the App ID / provisioning / team side to enable CoreNFC with NFCTagReaderSession for an individual (non-enterprise) developer account? Or any known issues where readingAvailable stays false even with NFC Tag Reading enabled and a custom iOS App Development profile? Any hints on what I might still be missing would be greatly appreciated.
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Nov ’25
How to connect to a IOUSBHostInterface
I have poked around the web looking for a good example to do this and I haven't found a working example. I need to connect to a USB Device, its multiple ports and supports what looks to be a root port and 4 other ports I am no expert in USB but I do know how to write a kext and client drivers, but thats really not the way to solve this. I need to display the serialized output from these USB ports for a development board. I would rather do this on my Mac than have to cobble up a Linux machine and mess around with Linux. Here is the output from ioreg MCHP-Debug@03100000 <class IOUSBHostDevice, id 0x105f6fdc2, registered, matched, active, busy 0 (20 ms), retain 27> MCHP-Debug@0 <class IOUSBHostInterface, id 0x105f6fdc8, registered, matched, active, busy 0 (13 ms), retain 5> +-o MCHP-Debug@0 <class IOUSBHostInterface, id 0x105f6fdc8, registered, matched, active, busy 0 (13 ms), retain 5> +-o MCHP-Debug@1 <class IOUSBHostInterface, id 0x105f6fdc9, registered, matched, active, busy 0 (11 ms), retain 5> +-o MCHP-Debug@2 <class IOUSBHostInterface, id 0x105f6fdcb, registered, matched, active, busy 0 (9 ms), retain 5> | | | | | +-o MCHP-Debug@3 <class IOUSBHostInterface, id 0x105f6fdcc, registered, matched, active, busy 0 (7 ms), retain 5> I have been able to open a inservice to the device at the top level, but I get an error when I use. usbHostInterface = [[IOUSBHostInterface alloc] initWithIOService:usbDevice options: IOUSBHostObjectInitOptionsNone queue: queue error: &error interestHandler: handler]; Error:Failed to create IOUSBHostInterface. with reason: Unable to obtain configuration descriptor. Assertion failed: (usbHostInterface), function main, file main.m, line 87. I started using DeviceKit but I received signing errors and I shouldn't have to go down that path just to dump data from a USB port? Any suggestions would be great, most of the Apple documentation on USB ports is like 20 years old and the new stuff pushes you towards DeviceKit.
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iOS App detecting external USB mass storage connection without user interaction
Title iOS App detecting external USB mass storage connection without user interaction Background We are developing an iOS application that connects to an action camera device via Bluetooth and Wi-Fi for control and data transfer. In addition to wireless connectivity, our product requirements include supporting USB Mass Storage mode, where the camera (or a generic USB flash drive) is connected to an iPhone using a Lightning / USB-C adapter and appears in the Files app as an external drive. Requirement Our app needs to detect when an external USB mass storage device is connected or disconnected, with the following constraints: The app is already running in the foreground No user interaction is performed (no button tap, no document picker, no import UI) The USB device can be: A generic USB flash drive An empty USB drive (no photos or videos) The app only needs to know: Whether an external USB storage device has been connected or removed No need to access device identity, vendor info, or low-level USB details The expected behavior is simply to update the app’s internal state or UI when a USB storage device becomes available. Investigation Performed We have already investigated and tested the following public and documented approaches, all of which did not provide a reliable or any notification for USB mass storage insertion: ExternalAccessory / MFi Not applicable for generic USB storage devices Darwin notifications / CoreFoundation Using notify_register_dispatch and CFNotificationCenterGetDarwinNotifyCenter System USB / storage related notifications do not fire for third-party apps File system APIs NSFileManager mountedVolumeURLsIncludingResourceValuesForKeys On iPhone, external USB drives visible in the Files app are not exposed as mounted volumes to third-party apps FileProvider / DocumentPicker Only provides access after explicit user interaction No background or passive notification of availability ImageCaptureCore Limited to PTP camera devices Does not apply to generic USB mass storage Based on our testing, none of the public APIs provide a way to detect USB mass storage insertion automatically without user interaction. Question to Apple We would like to confirm the official platform behavior and capability boundary: Is there any public, documented, App Store–approved API on iOS that allows a third-party app to be notified when a generic USB mass storage device is connected or disconnected, without user interaction? If not: Is this limitation intentional by platform design? Is the recommended approach to rely exclusively on user-initiated document access flows (e.g. document picker, import UI)? Are there any recommended best practices for apps that need to update their UI or internal state based on the availability of external USB storage devices? Our goal is to ensure that our implementation fully complies with iOS platform guidelines and App Store Review requirements. Environment iOS versions tested: iOS 18 (latest public release) Devices: iPhone models with Lightning / USB-C USB devices: generic USB flash drives (including empty drives) Closing We appreciate clarification on whether this capability is intentionally restricted on iOS and how Apple recommends designing user experience around external USB storage access. Thank you for your guidance.
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Missing calls to L2CAP Stream Delegate
I have a C++/Objective-C command line application, running on MacOs (15.1.1 (24B91)), that communicates with a Bluetooth LE peripheral. The application is build with Apple clang 16.0.0 and CMake as build system using Boost.Asio. I'm able to establish a L2CAP channel and after the channel is established, the peripheral sends a first (quite small) SDU on that channel to the application. The PSM is 0x80 and was chosen by the peripherals BLE stack. The application receives the PSM via GATT notification. I can see the SDU being send in a single LL PDU with Wireshark. I can also see the SDU being received in Apples PacketLogger. But I miss the corresponding call to a stream event handler. For all other GATT related events, the corresponding delegates / callbacks are called. The code that creates a dispatch queue and passes it to the CBCentralManager looks like this: dispatch_queue = dispatch_queue_create("de.torrox.ble_event_queue", NULL); manager = [[CBCentralManager alloc] initWithDelegate:self queue:dispatch_queue options:nil]; When the L2CAP channel is established, the didOpenL2CAPChannel callback gets called from a thread within the dispatch_queue (has been verified with lldb): - (void)peripheral:(CBPeripheral *)peripheral didOpenL2CAPChannel:(CBL2CAPChannel *)channel error:(NSError *)error { [channel inputStream].delegate = self; [channel outputStream].delegate = self; [[channel inputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [[channel outputStream] scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; [[channel inputStream] open]; [[channel outputStream] open]; ... // a reference to the channel is stored in the outside channel object [channel retain]; ... } Yet, not a single stream event is generated: - (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)event_code { Log( @"stream:handleEvent %@, %lu", stream, event_code ); ... } When I add a functionality, to poll the input stream, the stream will report the expected L2CAP input. But no event is generated. The main thread of execution is usually blocking on a boost::asio::io_context::run() call. The design is, to have the stream callback stream:handleEvent to post call back invocations on that io_context, and thus to wake up the main thread and get that callbacks being invoked on the main thread. All asynchronous GATT delegate calls are working as expected. The only missing events, are the events from the L2CAP streams. The same code worked in an older project on an older version of MacOs and an older version of Boost. How can I find out, why the stream delegates are not called?
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504
Dec ’24
IPad connected to DSLR captures incomplete image
At present, I am using the avfoundation external device API to connect my iPad to a DSLR camera for data collection. On my end, I am using AVCapture Video Data Output to obtain raw data for processing and rendering. However, the pixelbuf returned from the system layer is incomplete, with only a portion cropped in the middle. But using the Mac API is normal. I would like to ask how to obtain the complete pixelbuf of the image on iPad
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325
Dec ’24
iOS sdcard plug-in/unplug event and read problems
Currently, we use UIDocumentPickerViewController to read the user's connected sdcard. However, this requires the user to select manually, and the event cannot be monitored. But recently I found that ImageCaptureCore's ICDeviceBrowserDelegate can monitor the plug-in and unplug events in the didAddDevice callback, but cannot obtain the path of the storage card. I wonder if there is a way to combine the advantages of both, so that with the user's consent, the card reader events can be monitored and the content can be read directly without the user manually selecting the folder
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293
Jan ’25
'NDEF is disallowed' Xcode 16.2
Invalid entitlement for core nfc framework. The sdk version '18.2' and min OS version '14.0' are not compatible for the entitlement 'com.apple.developer.nfc.readersession.formats' because 'NDEF is disallowed'. Anyone knows what is the correct configuration SDK version and minimum iOS deployment target for NFC that has NDEF format?
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1.1k
Jan ’25
iPad Pro M4 Freezing and Restarting Daily Without Heavy Usage
I purchased an iPad Pro M4 in early December, and since day one, I’ve been experiencing a recurring issue. Almost every day, at random times, the device freezes for 1–5 minutes and then restarts itself. The tablet is not under heavy load when this happens — I mainly use it for light tasks such as watching videos in a player or Safari browser, web surfing, and reading books. The issue has even occurred while the iPad was idle and locked; it froze, displayed the Apple logo, and rebooted. I brought the device back to the store where I purchased it, and they sent it for a diagnostic check. However, the experts concluded that the device is fully functional, and no defects were found. After one of these crashes, I noticed that my Apple Pencil started lagging (see video file IMG_5688.MOV). However, after another reboot, the issue with the Apple Pencil resolved itself. I’ve documented the issue with several video recordings showing the freezing and rebooting behavior, as well as error logs generated after such incidents. Device Details: Model: iPad Pro M4 Usage: Light tasks only (video streaming, web browsing, reading) Environment: No overheating, no resource-heavy applications running What could be causing this issue, and how can I resolve it? Any help would be greatly appreciated. Thank you! P.S. I’ve uploaded all the device logs and videos demonstrating the issue to Google Drive. https://drive.google.com/drive/folders/1_R0i_iazADWo5EgStrPdgmf1XjgPP_RC?usp=sharing
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534
Jan ’25
It’s so slow to run anything
Trial Rollout: 652eff3d1bce5442b8d753c9 (ramp:654d29cb7e430f0ea5135e4b namespaces:VISUAL_INTELLIGENCE_RICH_LABEL_I18N) Trial Rollout: 654439cdafbf5b61207873a9 (ramp:65443b27f764584e3e121677 namespaces:SIRI_DATA_SHARING_MTE_OPT_OUT) Trial Rollout: 6090733d1c1e594b6765e603 (ramp:61f1fd4757c72d21f3fd20dc namespaces:WIRELESS_DATA_ANALYTICS_SIS_FR2HARVESTING) Trial Rollout: 63f9578e238e7b23a1f3030a (ramp:64af3a8e3789f0013152c6ea namespaces:SMART_REPLY_ACTIONS_EN) Trial Rollout: 64c17a9925d75a7281053d4c (ramp:64d297de1008ca2fac17a1dc namespaces:SIRI_AUDIO_DISABLE_MEDIA_ENTITY_SYNC) Trial Rollout: 64628732bf2f5257dedc8988 (ramp:651ca4291993407e6d574317 namespaces:) Trial Rollout: 6434420a89ec2e0a7a38bf5a (ramp:64c96f230d0abc3f1813bdab namespaces:) Trial Rollout: 639124e81d92412bfb4880b3 (ramp:63ffdf0ac679dd6bc58280c1 namespaces:SIRI_UNDERSTANDING_TMDC) Trial Rollout: 6246d6a916a70b047e454124 (ramp:6449728db0bf6a06721af761 namespaces:WALLET_APP_ECOM_PAYMENT_SHEET) Trial Rollout: 6425c75e4327780c10cc4252 (ramp:642b12bf4327780c10cc42e5 namespaces:SIRI_HOME_AUTOMATION_INTENT_SELECTION_CACHE) Trial Rollout: 60f8ddccefea4203d95cbeef (ramp:640141a8c679dd6bc5828185 namespaces:) Trial Rollout: 5f72dc58705eff005a46b3a9 (ramp:63d9571c2cb48e1296b0749a namespaces:SIRI_VIDEO_APP_SELECTION) Trial Rollout: 5fb4245a1bbfe8005e33a1e1 (ramp:635c675bc8a2104545a56d45 namespaces:) Trial Rollout: 60356660bbe37970735c5624 (ramp:618b79164b3765609b8b8252 namespaces:) Trial Rollout: 60da5e84ab0ca017dace9abf (ramp:6137762b61217b31102314aa namespaces:) Trial Rollout: 6081ed9716bb6d61d81d5014 (ramp:67953013d0a7cc3ee9718297 namespaces:BIFROST_PROD_1) Trial Rollout: 601074e4af9bef000c169ea8 (ramp:67953105c871785bbdefd35c namespaces:BIFROST_DEV_1) Trial Rollout: 6761d0c9df60af01adb250fb (ramp:6788a4224ebe024683e5aa2e namespaces:)
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Jan ’25