init([]) -> RanchSupSpec = {ranch_sup, {ranch_sup, start_link, []}, permanent, 5000, supervisor, [ranch_sup]}, ListenerSpec = ranch:child_spec(echo, 100, ranch_tcp, [{port, 5555}], echo_protocol, [] ), {ok, {{one_for_one, 10, 10}, [RanchSupSpec, ListenerSpec]}}.