I am testing a bit with fastpath and searching for xep-0142 clients I found a nice android client of Tigase, but it does not recognize this standard. I am not sure if this a problem of this client. I tried to verify with the rest api, but I do not think it has this option?
curl -H "Authorization: xxxx" -H "Accept: application/json" http://x.x.x.x:9090/plugins/restapi/v1/system/properties
If this is not advertised, could be good to do so, then other clients can also be used(?)