Localhost Service Discovery For a Custom XEP-0114 Component in Prosody or ejabberd - xmpp

Question

I have written a silly hello-world XEP-0114 component and got it connected to Prosody and ejabberd. Now I want to use service discovery to announce presence of the service and provide instructions about its usage.
So I seek a way to make it discoverable for anyone with a JID, remote or local, to provide more details about it.
For Prosody I do:
Component "foo.localhost"
component_secret = "secret"
disco_items = {
{ "foo.localhost", "FOO BAR" };
}
For ejabberd I do:
modules:
mod_disco:
extra_domains:
- "foo.localhost"
- "localhost"
server_info:
-
modules: all
name: "abuse-addresses"
urls:
- "foo.com"
listen:
-
port: 8888
module: ejabberd_service
access: all
shaper_rule: fast
ip: "127.0.0.1"
hosts:
"foo.localhost":
password: "secret"
Then in Gajim I start service discovery on localhost and get error:
There is no service at the address you entered, or it is not responding. Check the address and try again.
What do I miss?

Answer 1

First thing to check when in trouble is a XML-console of a xmpp-client (Gajim), there I found this:
<iq xmlns="jabber:client" to="localhost" type="get" id="546">
<query xmlns="http://jabber.org/protocol/disco#info" />
</iq>
<iq xml:lang='en' to='mynickhere#jabb.im/Gajim' from='localhost' type='error' id='546'>
<query xmlns='http://jabber.org/protocol/disco#info'/>
<error code='504' type='wait'>
<remote-server-timeout xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'/>
<text xml:lang='en' xmlns='urn:ietf:params:xml:ns:xmpp-stanzas'>Stream closed by peer: host-unknown</text>
</error>
</iq>
It shows that discovery requests are sent to the server where currently used account is located (jabb.im). I don't know how things work, but this should prompt you to disconnect from remote server, create account on local server and login with it instead, then discovery will work as expected.