XMPP EJabberd & Strophe Help

Strophe javascript library on client side & EJabberd server I'm need to understand how to handle reconnection in case of internet disruption. Use case 1: No Active Chats When internet is restored, what should I do to be available for incoming chats? Use case 2: Multiple Active Chats When internet is restored, what should I do to (how should I handle): (a) Send pending outgoing messages for multiple chats (b) Receive pending incoming messages from multiple chats Budget $50 Thanks!