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我依然在学习nav2 bt树 有一个疑问 我看到xml里面调用这个插件的时候会传入参数，按理说这个插件会调用planner插件进行路径规划，可我只在源码里面看到了读取参数和写入参数，并没有看见调用planner的地方呀 它是在哪里调用planner插件的呢
@王涛 读写参数是blackboard共享，这个函数是 on_tick ,所者这个use_start 是一个标志位，检查下这个标志在哪里被读取了
