iOS26 background lock screen Blood glucose monitoring Bluetooth low energy disconnect sleep

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First, our app communicates with our blood glucose monitor (CGM) using Bluetooth Low Energy (BLE).

On an iPhone 14 Pro with iOS 26.0.1, Bluetooth communication works properly even when the app is in the background and locked. Even if the phone and CGM are disconnected, the app continues to scan in the background and reconnects when the phone and CGM are back in close proximity. It won't be dormant in the background or when the screen is locked. This effectively ensures that diabetic users can monitor their blood glucose levels in real time.

However, after using iOS 26.0.1 on the iPhone 17, we've received user feedback about frequent disconnections in the background. Our logs indicate that Bluetooth communication is easily disconnected when switching to the background, and then easily dormant by the system, especially when the user's screen is locked. This situation significantly impacts users' blood glucose monitoring, and users are unacceptable. What can be done?

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Answer 1

Engineer OP

Apple

9h

There are a number of Bluetooth related fixes in iOS 26.1 on iPhone 17.

Please test with the current 26.1 beta 3, and see if the issue continues for your app/device.

If it does not seem to be fixed, then we'd need specific information about the issue.

We need a specific diagnostic log. Please go to https://developer.apple.com/bug-reporting/profiles-and-logs/ and follow the instructions for Bluetooth for iOS to install a logging profile on your device. Then reproduce the issue, and follow the instructions at the above link to create a sysdiagnose.

In that case, please open a bug report, include the sysdiagnose from above step, any other logs you might have, and sample code or models that reproduce the issue, and post the FB number here once you do.

Bug Reporting: How and Why? has tips on creating a successful bug report.

Important: For feedback related to a specific framework or API, select "Developer Technologies & SDKs" as your Topic, then select the specific technology and relevant OS. For feedback related to Xcode, App Store Connect, or other developer tools and resources, select "Developer Tools & Resources" as your Topic, then select the specific tool or resource.

If you file a bug report because the issue persists in 26.1, please @mention me so I don't miss the Feedback ID.

Argun Tekant /  WWDR Engineering / Core Technologies

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