unable to modify Sample Rate onTG30

[samuelgirardin]

So as I understand Sample Rate: 10.00K = 20Khz sample rate (20000 points/s)

[YDLIDAR] Sample Rate: 10.00K
[YDLIDAR] Successed to check the lidar, Elapsed time 448 ms
[2024-11-29 01:29:10][info] [YDLIDAR] Now lidar is scanning...

I try to lower the sample rate with :
int optval = try all value between 0 and 20
laser.setlidaropt(LidarPropSampleRate, &optval, sizeof(int));

The sample rate stay at 20000 points/s , any idea to lower the sample rate on TG30 ? Thks !