this is not directly related to Smack, but more to XMPP.
However, maybe you have an idea.
We need a way to keep track to the subscribe/subscribed presence packets.
So if User A sends a presence “subscribe” to User B, we want User A to know, if User B has received this packet.
For messages we do this with “XEP-0184: Message Delivery Receipts”, but this is not specified for presence packets.
Would you use it nonetheless, or is there any other method?