title: How to convert Wifi RSSI to level of Wifi strength in menu bar in Mac OSX?
body: <p>I can get the value of Wifi RSSI. but don't know how to convert it into level of Wifi strength as we can see in the menubar in Mac OSX (If I receive a strong Wifi, the wifi status will be bold black on all 4 lines of wifi icon).</p>
  
  <p>Is there any methods or library that I can use to do this? Thx in advance.</p>