Javadoc
Called when a response PDU is received for a previously sent request PDU.
Only "expected" responses are passed to this method. An "expected" response
is a response that matches a previously sent request. Both the original
request and the response along with other info is passed to this method.
NOTE: If another thread is "waiting" for a response, that thread will
receive it vs. this method. This method will only receive expected
responses that were either sent "asynchronously" or received after the
originating thread timed out while waiting for a response.