Triggers after message/chat is created.
~~~
<?php
function my_component_init(){
ossn_register_callback('message', 'created', 'my_component_cb');
}
function my_component_cb($callback, $type, array $params){
//$params[message_id, message_from, message_to, message]
}
ossn_register_callback('ossn', 'init', 'my_component_init');
~~~