adb connect

STEP 1.

Set the target device to listen for a TCP/IP connection on port 5555

disconnect the USB cable from the Android device
adb tcpip 5555

STEP 2.

Connect to a device over Wi-Fi.

find your Android device IP address at Settings > About phone > Status > IP address
adb connect 192.168.100.12

STEP 3.

Confirm that your host computer is connected to the Android device over Wi-Fi

adb devices
List of devices attached
192.168.100.12:5555 device