# BluetoothHCIError constants ## Topics ### Constants [`var kBluetoothHCIErrorACLConnectionAlreadyExists: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorACLConnectionAlreadyExists) [`var kBluetoothHCIErrorAuthenticationFailure: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorAuthenticationFailure) [`var kBluetoothHCIErrorChannelClassificationNotSupported: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorChannelClassificationNotSupported) [`var kBluetoothHCIErrorCommandDisallowed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorCommandDisallowed) [`var kBluetoothHCIErrorConnectionFailedToBeEstablished: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorConnectionFailedToBeEstablished) [`var kBluetoothHCIErrorConnectionRejectedDueToNoSuitableChannelFound: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorConnectionRejectedDueToNoSuitableChannelFound) [`var kBluetoothHCIErrorConnectionTerminatedByLocalHost: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorConnectionTerminatedByLocalHost) [`var kBluetoothHCIErrorConnectionTerminatedDueToMICFailure: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorConnectionTerminatedDueToMICFailure) [`var kBluetoothHCIErrorConnectionTimeout: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorConnectionTimeout) [`var kBluetoothHCIErrorControllerBusy: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorControllerBusy) [`var kBluetoothHCIErrorDifferentTransactionCollision: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorDifferentTransactionCollision) [`var kBluetoothHCIErrorDirectedAdvertisingTimeout: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorDirectedAdvertisingTimeout) [`var kBluetoothHCIErrorEncryptionModeNotAcceptable: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorEncryptionModeNotAcceptable) [`var kBluetoothHCIErrorExtendedInquiryResponseTooLarge: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorExtendedInquiryResponseTooLarge) [`var kBluetoothHCIErrorHardwareFailure: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHardwareFailure) [`var kBluetoothHCIErrorHostBusyPairing: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHostBusyPairing) [`var kBluetoothHCIErrorHostRejectedLimitedResources: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHostRejectedLimitedResources) [`var kBluetoothHCIErrorHostRejectedRemoteDeviceIsPersonal: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHostRejectedRemoteDeviceIsPersonal) [`var kBluetoothHCIErrorHostRejectedSecurityReasons: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHostRejectedSecurityReasons) [`var kBluetoothHCIErrorHostRejectedUnacceptableDeviceAddress: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHostRejectedUnacceptableDeviceAddress) [`var kBluetoothHCIErrorHostTimeout: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorHostTimeout) [`var kBluetoothHCIErrorInstantPassed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorInstantPassed) [`var kBluetoothHCIErrorInsufficientSecurity: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorInsufficientSecurity) [`var kBluetoothHCIErrorInvalidHCICommandParameters: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorInvalidHCICommandParameters) [`var kBluetoothHCIErrorInvalidLMPParameters: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorInvalidLMPParameters) [`var kBluetoothHCIErrorKeyMissing: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorKeyMissing) [`var kBluetoothHCIErrorLMPErrorTransactionCollision: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorLMPErrorTransactionCollision) [`var kBluetoothHCIErrorLMPPDUNotAllowed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorLMPPDUNotAllowed) [`var kBluetoothHCIErrorLMPResponseTimeout: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorLMPResponseTimeout) [`var kBluetoothHCIErrorMACConnectionFailed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorMACConnectionFailed) [`var kBluetoothHCIErrorMax: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorMax) [`var kBluetoothHCIErrorMaxNumberOfConnections: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorMaxNumberOfConnections) [`var kBluetoothHCIErrorMaxNumberOfSCOConnectionsToADevice: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorMaxNumberOfSCOConnectionsToADevice) [`var kBluetoothHCIErrorMemoryFull: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorMemoryFull) [`var kBluetoothHCIErrorNoConnection: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorNoConnection) [`var kBluetoothHCIErrorOtherEndTerminatedConnectionAboutToPowerOff: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorOtherEndTerminatedConnectionAboutToPowerOff) [`var kBluetoothHCIErrorOtherEndTerminatedConnectionLowResources: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorOtherEndTerminatedConnectionLowResources) [`var kBluetoothHCIErrorOtherEndTerminatedConnectionUserEnded: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorOtherEndTerminatedConnectionUserEnded) [`var kBluetoothHCIErrorPageTimeout: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorPageTimeout) [`var kBluetoothHCIErrorPairingNotAllowed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorPairingNotAllowed) [`var kBluetoothHCIErrorPairingWithUnitKeyNotSupported: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorPairingWithUnitKeyNotSupported) [`var kBluetoothHCIErrorParameterOutOfMandatoryRange: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorParameterOutOfMandatoryRange) [`var kBluetoothHCIErrorQoSNotSupported: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorQoSNotSupported) [`var kBluetoothHCIErrorQoSRejected: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorQoSRejected) [`var kBluetoothHCIErrorQoSUnacceptableParameter: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorQoSUnacceptableParameter) [`var kBluetoothHCIErrorRepeatedAttempts: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorRepeatedAttempts) [`var kBluetoothHCIErrorReservedSlotViolation: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorReservedSlotViolation) [`var kBluetoothHCIErrorRoleChangeNotAllowed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorRoleChangeNotAllowed) [`var kBluetoothHCIErrorRoleSwitchFailed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorRoleSwitchFailed) [`var kBluetoothHCIErrorRoleSwitchPending: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorRoleSwitchPending) [`var kBluetoothHCIErrorSCOAirModeRejected: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorSCOAirModeRejected) [`var kBluetoothHCIErrorSCOIntervalRejected: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorSCOIntervalRejected) [`var kBluetoothHCIErrorSCOOffsetRejected: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorSCOOffsetRejected) [`var kBluetoothHCIErrorSecureSimplePairingNotSupportedByHost: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorSecureSimplePairingNotSupportedByHost) [`var kBluetoothHCIErrorSuccess: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorSuccess) [`var kBluetoothHCIErrorUnacceptableConnectionInterval: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnacceptableConnectionInterval) [`var kBluetoothHCIErrorUnitKeyUsed: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnitKeyUsed) [`var kBluetoothHCIErrorUnknownHCICommand: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnknownHCICommand) [`var kBluetoothHCIErrorUnknownLMPPDU: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnknownLMPPDU) [`var kBluetoothHCIErrorUnspecifiedError: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnspecifiedError) [`var kBluetoothHCIErrorUnsupportedFeatureOrParameterValue: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnsupportedFeatureOrParameterValue) [`var kBluetoothHCIErrorUnsupportedLMPParameterValue: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnsupportedLMPParameterValue) [`var kBluetoothHCIErrorUnsupportedRemoteFeature: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorUnsupportedRemoteFeature) [`var kBluetoothHCIErrorCoarseClockAdjustmentRejected: Int`](/documentation/IOBluetooth/kBluetoothHCIErrorCoarseClockAdjustmentRejected) --- Copyright © 2026 Apple Inc. 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