type client struct {
	junk [4]int
	mu   sync.Mutex
	srv  *Server
	gw   *gateway
	msgb [100]byte
}

type gateway struct {
	cfg    *gatewayCfg
	outsim *sync.Map
}

type gatewayCfg struct {
	replyPfx []byte
}

type Account struct {
	Name string
}

type Server struct {
	gateway *srvGateway
}

type srvGateway struct {
	outo     []*client
}

type subscription struct {