public static void setDebug(Context ctx,
Set log message verbosity.
The default level is LIBUSB_LOG_LEVEL_NONE, which means no messages are ever printed. If you
choose to increase the message verbosity level, ensure that your application does not close
the stdout/stderr file descriptors.
You are advised to use level LIBUSB_LOG_LEVEL_WARNING. libusb is conservative with its message
logging and most of the time, will only log messages that explain error conditions and other
oddities. This will help you debug your software.
If the LIBUSB_DEBUG environment variable was set when libusb was initialized, this function
does nothing: the message verbosity is fixed to the value in the environment variable.
If libusb was compiled without any message logging, this function does nothing: you'll never
get any messages.
If libusb was compiled with verbose debug message logging, this function does nothing: you'll
always get messages from all levels.
ctx - the context to operate on, or NULL for the default context