Subcriber's on_data_available() not being called?

[srad0]

Using 2.7.1, I've got one publisher and one subscriber that are statically configured. Both publisher and subscriber are reporting that the domain participants are discovered, and that the listeners on both side are reporting a match via on_publication/subscription_matched().

The problem is that, while the publisher is writing data, the subscriber's on_data_available is not being called. It's on_subscription_matched() did get called. And if I stop the publisher, the match goes down on the subscriber side and loses the participant, as expected.

I've double checked the info in the XML files and all looks well.

Any thoughts?