struct · iOS 26.0+ · SDK 27.1
struct ConfigurationA structure that contains RCS configuration parameters, such as timing and size limits.
get supportsEndToEndEncryption(): booleanlet supportsEndToEndEncryption: BoolA Boolean value indicating whether the RCS service supports end-to-end encryption. Before your app sends a message or performs a request that may be end-to-end encrypted, ensure that the RCS service supports end-to-end encryption by checking this property.
get maximumGroupSize(): (number) | nullvar maximumGroupSize: Int? { get }The maximum number of participants allowed for a group chat. This value is `nil` if group chat is disabled.
get chatRevokeTimeout(): (SDKHandle) | nulllet chatRevokeTimeout: Duration?The maximum duration the service provider allows for delivery notification before it revokes a chat message. After the app sends a message, the system expects to receive a delivery notification for that message. When your app sends a message, start a timer with this timeout value. If the timer expires without receiving a delivery notification, revoke the message with ``RCSService/revokeMessage(_:)``, and resend with SMS or MMS. This value is represented as a Swift <doc://com.apple.documentation/documentation/swift/duration>, unless the client can't send Revoke Message requests, in which case the value is `nil`.
get maximumTextMessageSize(): (_Foundation_Measurement<_Foundation_UnitInformationStorage>) | nullvar maximumTextMessageSize: Measurement<UnitInformationStorage>? { get }The maximum size of a text chat message that a person can enter in a 1-to-1 chat or group chat session. This value is represented as a Foundation <doc://com.apple.documentation/documentation/foundation/measurement> that uses the <doc://com.apple.documentation/documentation/foundation/unitinformationstorage> unit type. If the messaging service is disabled, the value is `nil`.
get fileTransferWarningSize(): (_Foundation_Measurement<_Foundation_UnitInformationStorage>) | nulllet fileTransferWarningSize: Measurement<UnitInformationStorage>?The size for issuing a warning about file transfers and Rich Card media objects. This value is equivalent to `FT WARN SIZE` in the RCS specification. Consult the specification for handling pre-recorded video that uses a resolution greater than 480p encoded at 1200 kbps. The specification's guidance differs based on whether the file size is less than or greater than the warning size value. Your app may need to warn the person sending the video or force recompression to reduce its size. This value is represented as a Foundation <doc://com.apple.documentation/documentation/foundation/measurement> that uses the <doc://com.apple.documentation/documentation/foundation/unitinformationstorage> unit type. If the warning size isn't applicable, the value is `nil`.
get maximumFileTransferSize(): (_Foundation_Measurement<_Foundation_UnitInformationStorage>) | nullvar maximumFileTransferSize: Measurement<UnitInformationStorage>? { get }The maximum size of a file that the RCS file transfer service can send. This value is represented as a Foundation <doc://com.apple.documentation/documentation/foundation/measurement> that uses the <doc://com.apple.documentation/documentation/foundation/unitinformationstorage> unit type. If the messaging service doesn't limit the file size, the value is `nil`.
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