prosodyctl: Add external connectivity check based on observe.jabber.network This uses the (experimental) observe.jabber.network API to perform external connectivity checks. The idea is to complement the checks prosodyctl can already do with a (nearly) complete s2s/c2s handshake from a remote party to test the entire stack.

local xpcall = xpcall;

if select(2, xpcall(function (x) return x end, function () end,  "test")) ~= "test" then
	xpcall = require"util.compat".xpcall;
end

return {
	xpcall = xpcall;
};