@interface _TtCC14CopresenceCore11PubSubTopic8SendItem : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ data;
    void /* unknown type, empty encoding */ toParticipantIDs;
    void /* unknown type, empty encoding */ seqNum;
    void /* unknown type, empty encoding */ previousSeqNumUnacked;
    void /* unknown type, empty encoding */ publishedAt;
}

@end