Push notifications may be sent by Tigase XMPP Server with or without use of Push component. Push Component is only required if you have your own application for mobile devices for which you want to send push notifications.

If you are using existing application, then its maker have to provide you with push server (push component) which will send notification in format understandable by its application.

However, on Tigase XMPP Server side you need to enable processor which will generate notifications about offline messages sent to accounts on this server. To do so, you need to add following lines withing sess-man configuration block to enable urn:xmpp:push:0 processor:

'sess-man' () {
    'urn:xmpp:push:0' () {}
}