help please!!! How to use "LiDAR_IMU_Init" to init my own data?

[WN-Wolf]

I am a beginner, if you by pass, please take a look, many thanks!
I want to use FAST_LIO, but first I have to calibrate time.
lidar：livox mid-70
IMU：wit JY901B

I followed the readme to operate step by step, But there didn't have any results or error.
Here is my operation process. Please help to check which step went wrong! Thanks a lot!

1. start lidar
   roslaunch livox_ros_driver livox_lidar.launch
   
2. start imu
   roslaunch wit_ros_imu wit_imu.launch
   
3. to verify if data can be recieved
   
   rostopic echo /livox/lidar
   
   rostopic echo /wit/imu
   
4. record a rosbag
   rosbag record -o my_livox_wit.bag /livox/lidar /wit/imu
   
5. modify livox_wit_test.launch
   
6. modify wit_test.yaml
   
7. start lidar_imu_init
   roslaunch lidar_imu_init livox_wit_test.launch
   
8. another terminal rosbag play
   

The points:
rviz didn't show anything

terminal didn't show any error

The questions:
Initialization_result.txt didn't have anything!
I don't know how to do, please help me, many thanks!!! @zfc-zfc @Taeyoung96 @UAVlover

[WN-Wolf]

Thanks for your reply! @zfc-zfc
I want to make a summary and to help someone like me!

1. Publish data and record packages
   roslaunch livox_ros_driver livox_lidar_msg.launch # Please note this, only livox_lidar_msg.launch can publish this
   format[livox_ros_driver/CustomMsg]
   
   roslaunch wit_ros_imu wit_imu.launch
   rosbag record -o my_livox_wit.bag /livox/lidar /wit/imu

2. Init
   roslaunch lidar_imu_init livox_avia.launch # Please note this, remember to modify imu_topic with lid_topic!!!
   rosbag play my_livox_wit_2024-07-11-16-07-45.bag
   /home/ubuntu/cchen/catkin_ws/src/LiDAR_IMU_Init/result/Initialization_result.txt # result path