1) I am not able to manage continues connection using asmack . When asmack client lost the connection because of network problems or wifi connectivity issues it also display online in openfire console for sometimes.In this time duration if some one message to this user message is lost. Message is not deliver to this user and also Message is not stored in ofOffine message store.
2) I read about XEP-0198. Using this we can overcome this problem. I read many discussion regarding XEP-0198 in ignite realtime community. But there is not any movement regarding issues 
OF-446 and SMACK-333 .
3) Is there any news regarding XEP-0198 ?????