libusb_log_level

Log message levels.

• LIBUSB_LOG_LEVEL_NONE (0) : no messages ever printed by the library (default)
• LIBUSB_LOG_LEVEL_ERROR (1) : error messages are printed to stderr
• LIBUSB_LOG_LEVEL_WARNING (2) : warning and error messages are printed to stderr
• LIBUSB_LOG_LEVEL_INFO (3) : informational messages are printed to stdout, warning and error messages are printed to stderr
• LIBUSB_LOG_LEVEL_DEBUG (4) : debug and informational messages are printed to stdout, warnings and errors to stderr