ros2加载机器人时候可能遇到的问题

roslaunch does not provide any guarantees about what order nodes start in. This is intentional: there is no way to externally know when a node is fully initialized, so all code that is launched must be robust to launching in any order.

因为launch文件无法规定软件执行的顺序,所以有可能在发出建立机器人模型的时候,gazebo软件还没有完全启动-----然后就会看不到机器人-----虽然命令已经成功发出,但是看不到机器人,有这个可能

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