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What:		/sys/class/leds/blink1::<serial>/rgb
Date:		January 2013
Contact:	Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Description:	The ThingM blink1 is an USB RGB LED. The color notation is
		3-byte hexadecimal. Read this attribute to get the last set
		color. Write the 24-bit hexadecimal color to change the current
		LED color. The default color is full white (0xFFFFFF).
		For instance, set the color to green with: echo 00FF00 > rgb