I exactly know your problem. I don't think Jappix makes this possible but I have a solution that works for me.
On my XMPP server (prosody) I modified the message module so it sends all messages to all connected clients and I never miss a message (this solves the "in" part). Additional I installed http://xmpp.org/extensions/xep-0280.html which unfortunately is not very widespread in clients but I use it with myhub (mentioned above) so I get all messages ( in and out ) for logging.
For the future I'm planning to build a server that will render all these problems obsolte but until then we have to find ways around it.
If you need further ideas how to solve your problem I'd be glad to help :)
On my XMPP server (prosody) I modified the message module so it sends all messages to all connected clients and I never miss a message (this solves the "in" part). Additional I installed http://xmpp.org/extensions/xep-0280.html which unfortunately is not very widespread in clients but I use it with myhub (mentioned above) so I get all messages ( in and out ) for logging.
For the future I'm planning to build a server that will render all these problems obsolte but until then we have to find ways around it.
If you need further ideas how to solve your problem I'd be glad to help :)