Why is libusb_set_configuration called twice?

[Noir-]

I'm trying to understand the current implementation in order to add support for my Analog Rytm MKI. Is there any reason why this is called twice in a row?

dtdump/src/overbridge.c

Line 188 in a015555

ret = libusb_set_configuration(digit, 1);

Also, is there any explanation available where this magic number (1) comes from?

[droelfdroelf]

The initialization was basically copy pasted from USB sniffer logs I took with the Elektron drivers. Not sure if it is really needed to call usb_set_configuration() twice. The parameters were also taken from the sniffer logs. As for the Analog Rhythm, I remember that some of the Elektron devices run USB not at high speed (480MBit/s) but full speed only (12MBit/s), maybe they do things differently here to save bandwidth.