aioxmpp example to insert a custom attribute into a <message/>

fipa.py

import asyncio
import aioxmpp
import logging

logging.basicConfig(level=logging.DEBUG)

class Fipa(aioxmpp.xso.XSO):
    TAG = ("fipa:x:acl", "fipa-envelope")
    performative = aioxmpp.xso.Attr(tag="performative", type_=aioxmpp.xso.String(), default="QUERY")

async def connect(c):
     async with c.connected() as stream:

         aioxmpp.stanza.Message.fipa = aioxmpp.xso.Child([Fipa])
         msg = aioxmpp.stanza.Message(
             to=aioxmpp.JID.fromstr("jpalanca@localhost"),
             from_=aioxmpp.JID.fromstr("jpalanca@localhost"),
             type_=aioxmpp.MessageType.CHAT,
         )
         msg.body[None] = "Hello World!"
         msg.fipa = Fipa()
         msg.fipa.performative = "INFORM"
         await stream.send(msg)
         await asyncio.sleep(5)
         
jid = aioxmpp.JID.fromstr("jpalanca@localhost")   
client = aioxmpp.PresenceManagedClient(jid, aioxmpp.make_security_layer("********"))
loop = asyncio.get_event_loop()

try:
    loop.run_until_complete(connect(client))
except Exception as e:
    print(e)
finally:
    loop.close()