Would it be possible, without breaking the messenger paradigm very much, to provide some way of knowing which messages had not been delivered after a specified time?
i.e.
pn_message_set_ttl ( message, seconds );
and then maybe
int n_dead_letters = pn_messenger_expired ( messenger );
for ( i = 0 ; i < n_dead_letters; ++ i )
{
pn_messenger_get_dead_letter ( messenger );
/* app does something with dead letter */
}
