I found out an interesting thing.
I am also testing with Astra Mini S sensors, and when I connect 2 of them, the example works.
When I connect one Mini S, and one Stereo SU3, both work too.
The problem is when I connect two or more Stereo SU3. In this case, it does not work properly.
I suppose it's a problem with the sdk or the library. Seems unlikely to be a problem with my computer.
Thank you very much.