Read current RGB value on specified LED.
@note For mk2 devices only.
@param dev blink1 device to command
@param r pointer to red part of RGB color
@param g pointer to green part of RGB color
@param b pointer to blue part of RGB color
@param n which LED to get (0=1st, 1=1st LED, 2=2nd LED)
@return -1 on error, 0 on success
Read current RGB value on specified LED. @note For mk2 devices only. @param dev blink1 device to command @param r pointer to red part of RGB color @param g pointer to green part of RGB color @param b pointer to blue part of RGB color @param n which LED to get (0=1st, 1=1st LED, 2=2nd LED) @return -1 on error, 0 on success