We have received a response back on this.

To document:

Because the CAD send messages don't get broadcasted out the same way other cad packets do, you will have to do a little configuration in the CLS and possibly CAD to monitor CAD/MPS messages in ifcad/EF. 

1.  you will need to make sure that you have a subscription that looks like this, in CADDBM. (note:  you probably do, this is pretty common).  If you don’t have the below entries and you have to make changes to this description, you will need to restart the ChangePublisher Service.

2.  In the ListenerNotificationService.exe.config, you will need to find the key “CadChangeNotificationsToInclude”.  Change the value to look like the below example

3. Restart the ListenerNotificationService

These reports will not come through as IFCADMessageReports,  but they will come through as IFCADCustomReports with an ‘OriginatingAction’ of ‘CadChangeNotification

You should see two separate IFCADCustomReports one that contains the ‘MessageData’ and the other that contains the ‘MessageReceiveData’. 

These configuration changes have been tested and verified to produce results.

Any additional discoveries will be posted here as a reply to this post.

Nice work team!