AppleScript to Restart WiFi connection, in order to connect to closest AP in your network.

AppleScript Reconnect WiFi

on run
	try
		set airport_status to do shell script "networksetup -getairportpower en1"
		on error
			display dialog "The script did't work, please check the 'networksetup' command (in terminal) works on your system. " buttons {"kthxbai"}
	end try
	
	if airport_status is "Wi-Fi Power (en1): On" then
		do shell script "networksetup -setairportpower en1 off"
		do shell script "networksetup -setairportpower en1 on"

	else if airport_status is "Wi-Fi Power (en1): Off" then
		do shell script "networksetup -setairportpower en1 on"
    
	else
		display dialog "The script did't work, please check the Wi-Fi interface name (e.g. en1) " buttons {"kthxbai"}
	end if
end run

In order to get it working you may need to edit the interface name. To get the interface name, you can run the following command in the Terminal: networksetup -listnetworkserviceorder

You will receive a list that looks something like this:

n asterisk (*) denotes that a network service is disabled.
(1) LPSS Serial Adapter (1)
(Hardware Port: Modem (lpss-serial1), Device: lpss-serial1)

(2) LPSS Serial Adapter (2)
(Hardware Port: Modem (lpss-serial2), Device: lpss-serial2)

(3) USB 10/100/1000 LAN
(Hardware Port: USB 10/100/1000 LAN, Device: en5)

(4) Wi-Fi
(Hardware Port: Wi-Fi, Device: en0)

(5) Bluetooth PAN
(Hardware Port: Bluetooth PAN, Device: en7)

In my case, the interface name for the Wi-Fi is en0 (the name next to “Device:”).