We are seeing a case where writing data using .WithoutResponse: peripheral.writeValue(data, forCharacteristic: characteristic, type: .WithoutResponse) Is still getting a callback to: func peripheral(peripheral: CBPeripheral, didWriteValueForCharacteristic characteristic: CBCharacteristic, error: NSError?) { The error is nil and the char is the one we just wrote to (.WithoutResponse). What could cause such behavior? iOS 9.3, iPhone 6s+, Xcode7.3.1, iOS Central, Ti CC2640 BLE Stack 2.1.0 Peripheral _______________________________________________ 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