Currently, messenger always sets the reply-to field in a sent message.
This should be changed to allow the application to set the reply-to field only when a reply is desired. Messenger should be changed to not unconditionally set this field.
In order to set this field in the case of a client that has not established a subscription, the client needs to be able to query messenger for the proper value of the reply-to address. A new api would need to be created for this. Proposal:
int pn_messenger_set_reply( pn_messenger_t *msgr, pn_message_t *msg )
Set the proper reply-to address in msg. msg would need to have its "to" address configured in order for this method to succeed.
At least, I think the value for the reply-to may depend on the 'to' address... I may be wrong about that....