Not through a state channel but you can through an event Channel.
Create a Channel on the Broker Thing to subscribe to the wild card topic. One of the properties will be defining a separator character but # which is the default is usually sufficient. The event generated by the Channel sent to the rule will be <topic>#<message>
Use that Channel to trigger a rule directly. In a UI rule event.event has the String of the Channel event. In a file based rule it’s in event.receivedEvent. Simply split the event and you have both.
var topic = event.event.split('#')[0];
var message = event.event.split('#')[1];