In ASLEEP state also a PUBLISH-1 should trigger the sending of the pending messages on the subscribed topics terminating with a PINGRESP 

The scenario that I have in mind is the following:

1. A client CONNECT to a gateway (client enrollment) with a very long session expiry interval
2. The client subscribe to a certain topic to receive pending messages as soon as it sends a publish-1 message to a certain (also different) topic
3. The client DISCONNECT with a very long session expiry interval
4. After some time the client send a PUBLISH-1 message and would like to receive (like with the PINGREQ when in ASLEEP state) all pending messages on the topic it has subscribed to