Hello Franky,
I am afraid there may have been some confusion in this situation.
While I have not used the Light Rider app. It looks like it support Art-Net output. The LPU-1 and LPU-2 both support Art-Net output as well. Unfortunately the LPU does not support Art-Net input. Which makes it impossible to use the Light Rider app with the LPU.
Best regards,
Guido