Adding "meta data" to Message Stanza

[mtangoo]

Hi,
I have a simple chat app that is working fine. Now I want to add two things:

1. Message attachment type (Image, Contact or Location)
2. attachment data (JSON data)

After reading, it seems Extension is the way to go. But I cannot find any tutorial or documentation that shows how to do that.

All I could find is JavaDocs like this one, which is not useful for beginners like me.
https://download.igniterealtime.org/smack/dailybuilds/javadoc/org/jivesoftware/smack/packet/XmlElement.html

Is there any other way or documentation for extension?
Basically I want to attach type and attachment payload when sending a message and retrieve them at the receiving end.

TIA

[Flow]

I am sorry, I don’t have the time right now for a detailed answer. But maybe check out how a simple functionality like ‘chatstates’ are implemented in Smack:

Smack/smack-extensions/src/main/java/org/jivesoftware/smackx/chatstates at...