And our team will work on Message Delivery Receipts in a few days, I’m wondering if there is some other config item to let the OPENFIRE server to switch on
message delivery receipts function?
Or there is a way for me to customize my own openfire server codes?
XEP-0184 is strictly a client side feature. Openfire has nothing to do with this (only XEP-0198 has to be supported both by server and a client). I have made it clearer in the document now.
As i’m not a developer myself, can’t answer why the packet looks like this.