JEP-0022 delivered event

Any chance of implementing JEP-0022 delivered event? I need to have more reliable XMPP transport and such server confirmation would be helpful.

It is on clients side - question for server is invalid.

The client can’'t reply by saying that the user is offline, so this is definitely not only client-side.

see JEP-22:

“If the message is stored by the server, the server must raise the requested event (offline) by sending a message to the sender”