Launch-In-SITL.md

@@ -67,6 +67,13 @@ roslaunch realsense2_camera rs_camera.launch
 ```shell
 roslaunch ydlidar lidar.launch
 ```
+**Note:** For first time launch, run the following script to create a device name for ydlidar.
+```shell
+roscd ydlidar/startup
+sudo chmod 777 ./*
+sudo sh initenv.sh
+```
+You may need to disconnect and reconnect the camera.
 
 ## Launch ROS node
 source you setup.bash