return pongMsg{Err: &msg}
	}
	select {
	case <-m.ctx.Done():
		err := context.Cause(m.ctx).Error()
		return pongMsg{Err: &err}
	default:
		atomic.StoreInt64(&m.LastPing, time.Now().Unix())
		return pongMsg{}
	}
}

func (m *muxServer) disconnect(msg string) {
	if debugPrint {
		fmt.Println("Mux", m.ID, "disconnecting. Reason:", msg)
	}
	if msg != "" {