a note

put the display to sleep

pmset displaysleepnow

put the system to sleep

pmset sleepnow

detect whether display is asleep

# parse the output to extract the Display Asleep state. If nothing is found, the system is awake.
system_profiler SPDisplaysDataType

Available network connection services

scutil --nc list

scutil --nc start "xxx"
scutil --nc stop "xxx"