How to debug an Android app without using USB in android studio.

Open the terminal(android studio) or cmd.

• First time  need data cable
  
• Go to ADB location inside platform tools.
• Attach data cable .
• cmd>  adb devices(press enter)
• adb tcpip 5555 +enter.
• Remove cable.
• Go to phone settings => About Phone => Status => Check IP Address.
• adb connect IP address:5555

Example: 

• C:\Users\Laptop>d:
• D:\>cd AnddroidStudio\platform-tools
• D:\AnddroidStudio\platform-tools>adb devices
• List of devices attached
• 0123456789ABCDEF        device
• D:\AnddroidStudio\platform-tools>adb tcpip 5555
• restarting in TCP mode port: 5555
• D:\AnddroidStudio\platform-tools>adb connect 192.168.1.8:5555

After that connectivity is done(Android phone and Android studio).

May this lines help you. Thanks!!!!!!