How to broadcast message to offline contact?

In my IM client, I need send broadcast message to my contact, but when i set message type as ‘headline’, only online user can receive the broadcast message. I looked at the openfire source code and found that the message with type of headline or groupchat can’t be store in the database jiveoffline.But we often need to send broadcast message to offline contact, or in the context of persistent chatroom,when we start a conference,but some room members are offline, we also hope the chatroom member to receive the discussion message when they are online. What is the use of table ‘mucConversationLog’ in the database?

As Spark broadcast option can send to offline contacts too, and Spark’s broadcasts doesnt look like simple messages, maybe you should ask Daniel Henniger (jadestorm), current Spark developer, what message type is used in Spark.