Subscriber and publisher class are aware of each other but messages are not received

[edwin98thompson]

In an application I am developing, I have several topics and 2 executables that communicate via them. During application startup, I get confirmation that each publisher is aware of the corresponding subscriber and vice versa using the PublicationMatchedStatus() or SubscriptionMatchedStatus(); methods.
When it comes to sending the messages, I get confirmation the publish has happened but the subscriber never picks up the data.
My receiver class starts a thread which runs the receiver method, it uses the polling method shown in the hello world example.

I am wondering if there is a more reliable method to receive data perhaps? Let me know if you would like to see more and I can prepare a skeleton of my application which should demonstrate what I am trying to achieve.