Help needed

[Materie62]

Hi Luc,
I found your esp32-usb-serial code and I think this is what I need. I have a soundmeter, the NA-28, equipped with a USB port. Via this port you can control the soundmeter. I would like to use an ESP32S3 to control the soundmeter. The ESP32S3 is placed on a board with an extra USB OTG port (ESP32-S3-WROOM-1). I can compile your Arduino example code but no connection is established with the RION NA28. Your code keeps on trying and repeats:
Failed to open VCP device, retrying...
Opening any VCP device...

When the Rion is connected to a W11 computer and using a USB scanner (USBDeview) I can extract the follwing information:
oem18.txt

I believe I do something wrong but what? I hope you can help.

Greetings,
Roland

[luc-github]

the current usb drivers supported are listed in readme :
usb_host_ch34x_vcp
usb_host_cp210x_vcp
usb_host_ftdi_vcp

So Silicon Labs CP210x, FTDI FT23x or CP34x USB to UART converter only are supported

Your soundmeter seems having another chip used RION which is not supported that is why connection is not working, I do not write drivers , I have just used existing ones