爱站程序员基地[ERROR] Failed to contact master at [localhost:11311]. Retrying…
检查roscore
roslaunch等命令运行时会自动检查并启动roscore，直接运行rosrun等命令会报错
参考：https://www.cnblogs.com/Jessica-jie/p/6591230.html
检查roscore
roslaunch等命令运行时会自动检查并启动roscore，直接运行rosrun等命令会报错
参考：https://www.cnblogs.com/Jessica-jie/p/6591230.html
![[翻译] Backpressure explained — the resisted flow of data through software-爱站程序员基地](https://aiznh.com/wp-content/uploads/2021/05/10-220x150.jpeg)
