Notify user when cancelling requests
Call handler with empty results, if destroying disco request object
not by user request (eg. on reconnect or module unloading)
/DISCO [info|items] [jid|.|./resource] [node]
Sends service discovery requests to specified jid (use . to specify current byddy's jid) and, optionally, to specific node of that jid.
/disco info [jid|.|./resource] [node]
Sends disco#info request.
/disco items [jid|.|./resource] [node]
Sends disco#items request.
Note: unlike other commands, here you can use ./resource notation.