How to get Message Delivery Receipts when receiver app is in killed mode using XMPP iOS?

Question

I need help to reach out to this problem in XMPP.

Scenario

There are two users (User A & User B).

1. A is online and B Killed his application.
2. A send a message to B and A need a message delivery receipt from B but B is not connected with XMPP.
3. So B is not connected with XMPP which means A will not get a delivery receipt until B not connected with XMPP.
4. For solving out above problem we implement Remote Notification when the user is Offline.
5. Now A send message to B and B received Remote Notification.
6. B WakeUp his App and Make a connection with XMPP and Now A received a delivery receipt.

Using 5 & 6 points, I can solve the above problem, but this makes one new issue(You can suggest the best way to do the above).

When B makes a connection with XMPP. his last seen showing as ONLINE.

I need when B connect from Killed Mode I don't want to show as ONLINE.

Thank You in advance for your solution.