Attempt to read current RGB value for mk1 devices.
@note Called by blink1_setRGB() if device is mk1.
@note Does not always work.
@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
@return -1 on error, 0 on success
Attempt to read current RGB value for mk1 devices. @note Called by blink1_setRGB() if device is mk1. @note Does not always work. @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 @return -1 on error, 0 on success