extension field. Visible for the current user.
sessionId
For example p2p-cs1, team-113879441
body of the last message
If lastMsgType is a normal message, the type is NIMMessage If lastMsgType is a notification for unsending a message, the type is NIMSystemMessage
The type of the last message. A value of "0" or missing means a normal message, "1" means a notification for unsending a message.
Get the update time
loud conversation definition