Requirements

Ensure that presence-offline plugin is enabled in config.tdsl. To do this, add be sure presence-offline is listed under sess-man

'sess-man' {
    'presence-offline' () {}
}

The following two lines in sess-man configure options to broadcast probes to offline users. 

'sess-man' {
    'skip-offline' = 'false'
    'skip-offline-sys' = 'false'
}

Without these lines, Tigase will not send presence probes to users that the server knows to be offline.

The full XML presence is stored under the tig_pairs table with a pkey of last-unavailable-presence will look like this: 

<presence from="user@example.com" xmlns="jabber:client" type="unavailable">
<status>Logged out</status>
<delay stamp="2015-12-29T16:51:50.748Z" xmlns="urn:xmpp:delay"/></presence>

As you can see, the plugin has added a delay stamp which indicates the last time they were seen online. This may be suppressed by using the following line in your config.tdsl file. 

'sess-man' {
    'delay-stamp' = 'false'
}

You may also limit probe responses only to newly connected resources.

'sess-man' {
    'probe-full-jid' = 'true'
}

When a user logs on, they will receive the same full unavailable presence statements from contacts not logged in. Also the repository entry containing their last unavailable presence will be removed.

NOTE: This will increase traffic with users with many people on their rosters.

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