Hello Karl,
Thank you for your question

With the LPU-1 there is unfortunately no supported way to trigger Cuety playbacks from physical buttons, B-Station2, ESP32, OSC, UDP, TCP or HTTP. The LPU-1 is intended to be controlled from the Cuety App or Cuety Remote App.
For an LPU-1 setup, the best workaround would be to use Cuety Remote on a phone or tablet as a simple playback button panel.
If real physical buttons or external network commands are required, then I would recommend using an LPU-2 instead. The LPU-2 supports OSC, UDP, TCP and HTTP, so it can be controlled by a B-Station2, ESP32 or similar external device.
Hope this helps!