Openfire lost some message

Openfire
1

I use openfire to create a chat tool, but I find that A chat to B online when B offline, within some seconds message A send to B is lost not in [ofOffline] table.

Why? How can I do it ?
2

Read this https://discourse.igniterealtime.org/t/explanation-options-to-mitigate-messages-loss-because-of-network-problems

Especially about the bug in Openfire and read comments on that ticket to find out how to disable Stream Management.

3

Ok, thanks ! I’m Chinese, and my English is just soso. Thank you very much to read my message and reply to me.

Best wishes!