...

Once the Topic is properly provisioned, Buscontroller is no longer needed - it is not part of the message delivery flow.

Topic Publication Using the MR API

An http client can be a publisher of an authenticated topic if it passes the authorized Application Identity using Basic Authentication.  If a local file, fileContainingMsg, exists, then an example of a curl publisher might be:

...

NOTE: if the Basic Authentication credentials were not passed, the publish attempt should fail with a 401.  If some other credentials that hadn't been granted the publish permission were passed, the publish attempt should fail with 403. 

Topic Subscription Using the MR API

An http client can be a subscriber of an authenticated topic if it passes the authorized Application Identity using Basic Authentication.   The subscriber must further qualify their request with a Consumer Group identifier/Consumer Id.  For example, the first subscriber of group 'example' might poll Message Router like this:

...