Users group notified when logged in

Here is what I’m trying to do.

make 1 group will all the people I want to see to show as a offline group, when those people login it will show them as online, without asking for friends requests and so on. I have the offline group set up but when my other test account logs in its still showing as offline. I’m Pulling the group lists via ldap

So how can I make the group users show up as online when they login with spark?

Thank you

Still having issues with this, I see the groups I added in the spark application but when one of them Logs on they still show as not online?..

How long it takes between pressing online button in spark and getting online(with roster populated)?