package main import ( "log" "github.com/tidwall/doppio" ) func main() { var events doppio.Events events.Serving = func(wake func(id int) bool) (action doppio.Action) { log.Print("echo server started on port 5000") return } events.Data = func(id int, in []byte) (out []byte, action doppio.Action) { out = in return } log.Fatal(doppio.Serve(events, "tcp://0.0.0.0:5000")) }