本教程向你展示如何使用smach查看器，这是一种简单的工具，可以监视状态机并对状态之间的数据流进行内省。

This tutorial shows you how to use the smach viewer, a simple tool to monitor state machines and get introspection into the data flow between states.

This tutorial shows you how to use the smach viewer, a simple tool to monitor state machines and get introspection into the data flow between states.