Prior to iOS10, writing data to a peripheral with: peripheral.writeValue(data, forCharacteristic: characteristic, type: .WithoutResponse) would not call the delegates didWriteValueForCharacteristic (as per documentation). However, the same code in iOS10, the delegate receives a call to didWriteValueForCharacteristic regardless of the rite type The error is nil and the char is the one we just wrote to (using .WithoutResponse). iOS 10.0.1, iPhone 6s+, Xcode8, iOS10 sdk, iOS 10 deployment target radar://27269173 _______________________________________________ Do not post admin requests to the list. They will be ignored. Bluetooth-dev mailing list (Bluetooth-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/bluetooth-dev/site_archiver%40lists.... This email sent to site_archiver@lists.apple.com