Open by "id", which if from 0-blink1_max_devices is index or if blink1_max_devices, is numerical representation of serial number
ordinal 0-15 id of blink1 or numerical rep of 8-hex digit serial
blink1_device or NULL if no blink1 found
See Implementation
Open by "id", which if from 0-blink1_max_devices is index or if blink1_max_devices, is numerical representation of serial number