Some Comments

[Ian Craggs <icraggs@modelbasedtesting.co.uk>]

1.  If a requested QoS is 3 in subscribe, it is not clear whether this 
is a malformed packet which should cause the session to be terminated, 
or whether a suback should be returned with invalid request or lower 
granted QoS.  (I think the first case is intended.)


2. When receiving a publish with the retained flag set and a payload of 
0 length, it is clear that any existing retained message should be 
removed.  But what if there is no existing retained message?  In that 
case it is not clear if we set a retained message of 0 length, or not. 
(I expect not).


3. # wildcards used to be allowed at the beginning of topic filters as 
well as at the end.  Is this a deliberate restriction?

Ian