I just download Xcode 9 and was going through wireless debugging tutorials . I went through this link Wireless debugging but could not make out why my wireless debugging icon is not showing. My device is iPhone 6s updated to iOS 11. and the debugging icon is missing . Snaphot . The icon is missing.
What I got from others tutorial, is the icon they are getting, which I am not getting. Like this in apple documents. .
Network icon is not showing because your device is not paired up to the MAC you are using. If it's not working by connecting to the same WiFi network. you can connect to same network via Bluetooth.
You can see the network icon next to the device name in Xcode -> window -> Devices & Simulator -> select the device.
This worked for me. Hope this helps!