Can i listen peripheral instead of scan?

[leo.ni]

Hi,all. i use iPhone6 to scan peripherals around.As this,power consume great.Can i listen peripheral instead? Is it save power?Thanks a lot!

[David Edwin]

The scanner can do passive scanning as opposed to active scanning to reduce power consumption. However I am certain that iOS only uses active scanning. Active scanning means sending out SCAN_REQ while passive scanning means listening to the Advertisement packets being received.