I've added NS_SWIFT_SENDABLE to every type that has a docstring and…

… their accompanied enums and params types.

Source/PrivateHeaders/Ably/ARTAttachRequestParams.h

@@ -8,6 +8,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  Provides parameters for a request to perform an operation that may ultimately call `ARTChannelRealtimeInternal`’s `internalAttach:callback:` method.
  */
+NS_SWIFT_SENDABLE
 NS_SWIFT_NAME(AttachRequestParams)
 @interface ARTAttachRequestParams: NSObject
 

Source/PrivateHeaders/Ably/ARTChannelStateChangeParams.h

@@ -11,6 +11,7 @@ NS_ASSUME_NONNULL_BEGIN
 
  `ARTRealtimeChannelInternal` will incorporate some of this data into the `ARTChannelStateChange` object that it emits as a result of the connection state change.
  */
+NS_SWIFT_SENDABLE
 NS_SWIFT_NAME(ChannelStateChangeParams)
 @interface ARTChannelStateChangeParams: NSObject
 

Source/PrivateHeaders/Ably/ARTConnectionStateChangeParams.h

@@ -10,6 +10,7 @@ NS_ASSUME_NONNULL_BEGIN
 
  `ARTRealtimeInternal` will incorporate this data into the `ARTConnectionStateChange` object that it emits as a result of the connection state change.
  */
+NS_SWIFT_SENDABLE
 NS_SWIFT_NAME(ConnectionStateChangeParams)
 @interface ARTConnectionStateChangeParams: NSObject
 

Source/PrivateHeaders/Ably/ARTTestClientOptions.h

@@ -10,6 +10,7 @@ NS_ASSUME_NONNULL_BEGIN
 
  This is for anything that test code wishes to be able to configure but which should not be part of the public API of these classes.
  */
+NS_SWIFT_SENDABLE
 @interface ARTTestClientOptions: NSObject <NSCopying>
 
 /**

Source/include/Ably/ARTAuth.h

@@ -88,6 +88,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTAuthProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTAuth : NSObject <ARTAuthProtocol>
 
 @end

Source/include/Ably/ARTAuthDetails.h

@@ -5,6 +5,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains the token string used to authenticate a client with Ably.
  */
+NS_SWIFT_SENDABLE
 @interface ARTAuthDetails : NSObject<NSCopying>
 
 /**

Source/include/Ably/ARTAuthOptions.h

@@ -18,6 +18,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Passes authentication-specific properties in authentication requests to Ably. Properties set using `ARTAuthOptions` are used instead of the default values set when the client library is instantiated, as opposed to being merged with them.
  */
+NS_SWIFT_SENDABLE
 @interface ARTAuthOptions : NSObject<NSCopying>
 
 /**

Source/include/Ably/ARTChannel.h

@@ -79,6 +79,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTChannelProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTChannel : NSObject<ARTChannelProtocol>
 
 /// :nodoc:

Source/include/Ably/ARTChannelOptions.h

@@ -8,6 +8,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Passes additional properties to an `ARTRestChannel` object, such as encryption.
  */
+NS_SWIFT_SENDABLE
 @interface ARTChannelOptions : NSObject
 
 /**

Source/include/Ably/ARTChannels.h

@@ -7,6 +7,7 @@
 /**
  * Creates and destroys `ARTRestChannel` and `ARTRealtimeChannel` objects.
  */
+NS_SWIFT_SENDABLE
 @interface ARTChannels<ChannelType> : NSObject
 
 /**

Source/include/Ably/ARTClientOptions.h

@@ -12,6 +12,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Passes additional client-specific properties to the REST `-[ARTRestProtocol initWithOptions:]` or the Realtime `-[ARTRealtimeProtocol initWithOptions:]`.
  */
+NS_SWIFT_SENDABLE
 @interface ARTClientOptions : ARTAuthOptions
 
 /**

Source/include/Ably/ARTConnection.h

@@ -80,6 +80,7 @@ ART_EMBED_INTERFACE_EVENT_EMITTER(ARTRealtimeConnectionEvent, ARTConnectionState
  *
  * @see See `ARTConnectionProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTConnection: NSObject <ARTConnectionProtocol>
 
 @end

Source/include/Ably/ARTConnectionDetails.h

@@ -5,6 +5,7 @@
 /**
  * Contains any constraints a client should adhere to and provides additional metadata about a `ARTConnection`, such as if a request to `-[ARTChannelProtocol publish:callback:]` a message that exceeds the maximum message size should be rejected immediately without communicating with Ably.
  */
+NS_SWIFT_SENDABLE
 @interface ARTConnectionDetails : NSObject
 
 NS_ASSUME_NONNULL_BEGIN

Source/include/Ably/ARTDataQuery.h

@@ -5,6 +5,7 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /// :nodoc:
+NS_SWIFT_SENDABLE
 typedef NS_ENUM(NSUInteger, ARTQueryDirection) {
     ARTQueryDirectionForwards,
     ARTQueryDirectionBackwards
@@ -13,6 +14,7 @@ typedef NS_ENUM(NSUInteger, ARTQueryDirection) {
 /**
  This object is used for providing parameters into methods with paginated results.
  */
+NS_SWIFT_SENDABLE
 @interface ARTDataQuery : NSObject
 
 /**
@@ -40,6 +42,7 @@ typedef NS_ENUM(NSUInteger, ARTQueryDirection) {
 /**
  This object is used for providing parameters into `ARTRealtimePresence`'s methods with paginated results.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRealtimeHistoryQuery : ARTDataQuery
 
 /**

Source/include/Ably/ARTDeviceDetails.h

@@ -8,6 +8,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains the properties of a device registered for push notifications.
  */
+NS_SWIFT_SENDABLE
 @interface ARTDeviceDetails : NSObject
 
 /**

Source/include/Ably/ARTDeviceIdentityTokenDetails.h

@@ -5,6 +5,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * An object representing a unique device identity token used to communicate with APNS.
  */
+NS_SWIFT_SENDABLE
 @interface ARTDeviceIdentityTokenDetails : NSObject <NSSecureCoding>
 
 /**

Source/include/Ably/ARTDevicePushDetails.h

@@ -7,6 +7,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains the details of the push registration of a device.
  */
+NS_SWIFT_SENDABLE
 @interface ARTDevicePushDetails : NSObject
 
 /**

Source/include/Ably/ARTEventEmitter.h

@@ -23,12 +23,14 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  An object representing a listener returned by `ARTEventEmitter` methods.
  */
+NS_SWIFT_SENDABLE
 @interface ARTEventListener : NSObject
 @end
 
 /**
  * A generic interface for event registration and delivery used in a number of the types in the Realtime client library. For example, the `ARTConnection` and `ARTRealtimeChannel` objects emit events for their state using the `ARTEventEmitter` pattern.
  */
+NS_SWIFT_SENDABLE
 @interface ARTEventEmitter<EventType:id<ARTEventIdentification>, ItemType> : NSObject
 
 /// :nodoc:

Source/include/Ably/ARTHTTPPaginatedResponse.h

@@ -7,6 +7,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * A superset of `ARTPaginatedResult` which represents a page of results plus metadata indicating the relative queries available to it. `ARTHttpPaginatedResponse` additionally carries information about the response to an HTTP request.
  */
+NS_SWIFT_SENDABLE
 @interface ARTHTTPPaginatedResponse : ARTPaginatedResult<NSDictionary *>
 
 /**

Source/include/Ably/ARTLocalDevice.h

@@ -8,6 +8,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains the device identity token and secret of a device. `ARTLocalDevice` extends `ARTDeviceDetails`.
  */
+NS_SWIFT_SENDABLE
 @interface ARTLocalDevice : ARTDeviceDetails
 
 /**

Source/include/Ably/ARTMessage.h

@@ -9,6 +9,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains an individual message that is sent to, or received from, Ably.
  */
+NS_SWIFT_SENDABLE
 @interface ARTMessage : ARTBaseMessage
 
 /// The event name, if available

Source/include/Ably/ARTPaginatedResult.h

@@ -8,6 +8,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains a page of results for message or presence history, stats, or REST presence requests. An `ARTPaginatedResult` response from a REST API paginated query is also accompanied by metadata that indicates the relative queries available to the `ARTPaginatedResult` object.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPaginatedResult<ItemType> : NSObject
 
 /**

Source/include/Ably/ARTPresence.h

@@ -7,6 +7,7 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /// :nodoc:
+NS_SWIFT_SENDABLE
 @interface ARTPresence : NSObject
 
 - (void)history:(ARTPaginatedPresenceCallback)callback;

Source/include/Ably/ARTPresenceMessage.h

@@ -4,6 +4,7 @@
 /**
  * Describes the possible actions members in the presence set can emit.
  */
+NS_SWIFT_SENDABLE
 typedef NS_ENUM(NSUInteger, ARTPresenceAction) {
     /**
      * A member is not present in the channel.
@@ -35,6 +36,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains an individual presence update sent to, or received from, Ably.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPresenceMessage : ARTBaseMessage
 
 /**

Source/include/Ably/ARTPush.h

@@ -111,6 +111,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Enables a device to be registered and deregistered from receiving push notifications.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPush : NSObject <ARTPushProtocol>
 
 /**

Source/include/Ably/ARTPushAdmin.h

@@ -27,6 +27,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Enables the management of device registrations and push notification subscriptions. Also enables the publishing of push notifications to devices.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPushAdmin : NSObject <ARTPushAdminProtocol>
 
 /**

Source/include/Ably/ARTPushChannel.h

@@ -83,6 +83,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTPushChannelProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPushChannel : NSObject <ARTPushChannelProtocol>
 
 @end

Source/include/Ably/ARTPushChannelSubscription.h

@@ -5,6 +5,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Contains the subscriptions of a device, or a group of devices sharing the same `clientId`, has to a channel in order to receive push notifications.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPushChannelSubscription : NSObject
 
 /**

Source/include/Ably/ARTPushChannelSubscriptions.h

@@ -62,6 +62,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTPushChannelSubscriptionsProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPushChannelSubscriptions : NSObject <ARTPushChannelSubscriptionsProtocol>
 
 @end

Source/include/Ably/ARTPushDeviceRegistrations.h

@@ -61,6 +61,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTPushDeviceRegistrationsProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPushDeviceRegistrations : NSObject <ARTPushDeviceRegistrationsProtocol>
 
 @end

Source/include/Ably/ARTRealtime.h

@@ -104,6 +104,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * A client that extends the functionality of the `ARTRest` and provides additional realtime-specific features.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRealtime : NSObject <ARTRealtimeProtocol>
 
 /**

Source/include/Ably/ARTRealtimeChannel.h

@@ -149,6 +149,7 @@ ART_EMBED_INTERFACE_EVENT_EMITTER(ARTChannelEvent, ARTChannelStateChange *)
  * Enables messages to be published and subscribed to. Also enables historic messages to be retrieved and provides access to the `ARTRealtimePresence` object of a channel.
  * Also implements `ARTEventEmitter` interface and emits `ARTChannelEvent` events, where a `ARTChannelEvent` is either a `ARTRealtimeChannelState` or an `ARTChannelEvent.ARTChannelEventUpdate`.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRealtimeChannel : NSObject <ARTRealtimeChannelProtocol>
 
 /**

Source/include/Ably/ARTRealtimeChannelOptions.h

@@ -5,6 +5,7 @@
 /**
  * Describes the possible flags used to configure client capabilities, using `ARTChannelOptions`.
  */
+NS_SWIFT_SENDABLE
 typedef NS_OPTIONS(NSUInteger, ARTChannelMode) {
     /**
          * The client can enter the presence set.
@@ -29,6 +30,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Passes additional properties to an `ARTRealtimeChannel` object, such as encryption, an `ARTChannelMode` and channel parameters.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRealtimeChannelOptions : ARTChannelOptions
 
 /**

Source/include/Ably/ARTRealtimePresence.h

@@ -10,6 +10,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  This object is used for providing parameters into `ARTRealtimePresence`'s methods with paginated results.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRealtimePresenceQuery : ARTPresenceQuery
 
 /**
@@ -217,6 +218,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTRealtimePresenceProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRealtimePresence : ARTPresence <ARTRealtimePresenceProtocol>
 @end
 

Source/include/Ably/ARTRest.h

@@ -99,6 +99,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * A client that offers a simple stateless API to interact directly with Ably's REST API.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRest : NSObject <ARTRestProtocol>
 
 /**

Source/include/Ably/ARTRestChannel.h

@@ -46,6 +46,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  * Enables messages to be published and historic messages to be retrieved for a channel.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRestChannel : NSObject <ARTRestChannelProtocol>
 
 /**

Source/include/Ably/ARTRestPresence.h

@@ -10,6 +10,7 @@ NS_ASSUME_NONNULL_BEGIN
 /**
  This object is used for providing parameters into `ARTRestPresence`'s methods with paginated results.
  */
+NS_SWIFT_SENDABLE
 @interface ARTPresenceQuery : NSObject
 
 /**
@@ -78,6 +79,7 @@ NS_ASSUME_NONNULL_BEGIN
  *
  * @see See `ARTRestPresenceProtocol` for details.
  */
+NS_SWIFT_SENDABLE
 @interface ARTRestPresence : ARTPresence <ARTRestPresenceProtocol>
 @end