胡春旭第九章啟動mrobot_with_laser.launch出現的問題

問題内容：

[ERROR] [1672146969.554200604]: Error, operation time out. RESULT_OPERATION_TIMEOUT!

[rplidarNode-6] process has died [pid 22731, exit code 255, cmd /opt/ros/kinetic/lib/rplidar_ros/rplidarNode __name:=rplidarNode __log:=/home/wyw/.ros/log/9d7e0be4-85e8-11ed-ab36-24ec993a1445/rplidarNode-6.log].

log file: /home/wyw/.ros/log/9d7e0be4-85e8-11ed-ab36-24ec993a1445/rplidarNode-6*.log

解決辦法：首先打開launch檔案看端口号是否對應

                  端口号查詢代碼:

ls /dev/ttyUSB*
           

若端口代碼一緻則需要賦予端口的權限：

sudo chmod 777 /dev/ttyUSB0
           

 此處的USB0是按照查詢結果來寫的

至此問題解決