Communication between manager class and object class

I'm facing a designissue. I'm using DDS (Data Distribution Service) protocol to communicate between application. In my DDS Library I have 3 classes: - DDSWriter to write messages to other applications - DDSReader to read messages from other applications - DDSManager to instantiate the two others, manage them and be the entry point for the application

DDSManager have an objet which refer to DDSWriter and another which refer to DDSReader. DDSReader have a thread to read continually the data that we receive but no objet we refer to DDSManager.

How can I send data from DDSReader to DDSManager in this case ?

Thanks in advance for your help.