mod_ping_muc: Delay ping a configurable amount of time If a server is restarting, checking immediately before it has a chance to complete its restart and get ready would often fail, preventing the possibility of transparent restarts as supported by Prosody's mod_muc. Reconnecting immediately when a connection is closed for being idle, or because the remote server is trying to reclaim some resources, is also counter-productive as the connection may fail. Also, if there is some Internet routing problem affecting s2s, it may help to wait a bit before checking, in case the problem resolved itself in the mean time.

local st = require"util.stanza";
local datetime = require"util.datetime";

local presence = st.presence({ from = module.host })
	:tag("delay", { xmlns = "urn:xmpp:delay",
		stamp = datetime.datetime(prosody.start_time) });

module:hook("presence/host", function(event)
	local stanza = event.stanza;
	if stanza.attr.type == "probe" then
		presence.attr.id = stanza.attr.id;
		presence.attr.to = stanza.attr.from;
		module:send(presence);
		return true;
	end
end, 10);