BSSID of CoreWLAN getting nil in mac os 10.14

I want to get the bssid of connected wifi network. I am using below block of code it is working fine below 10.14 but after 10.14 getting

nil

rssiValue

noiseMeasurement

transmitRate

[CWWiFiClient sharedWiFiClient].interface.bssid

Any Suggestions would me more helpful