script to enable/disable an ip address with an IF

RouterOS Scripting
1

Hi guys, I would like to know how to make a script to be run when a specific IP address is not detected in the ARP table. For example

If ip addres 10.70.3.5 in arp table is not registered then
enable ip address 10.70.1.1/30

and when ip address 10.70.3.5 is detected in arp table again
disable ip address 10.70.1.1/30

this would be on a scheduled task to be run every 10 seconds

Thank you so much for all your help!!!

2

It is not pretty but it works on my test environment:
Oneliner style

:if ([/ip arp print as-value where address="10.70.3.5"] = "") do={/ip address enable numbers=[/ip address find where address="10.70.1.1/30"]} else={/ip address disable numbers=[/ip address find where address="10.70.1.1/30"]}

The same code in readable format

:if ([/ip arp print as-value where address="10.70.3.5"] = "") do={
   /ip address enable numbers=[/ip address find where address="10.70.1.1/30"]
} else={
   /ip address disable numbers=[/ip address find where address="10.70.1.1/30"]
}
3

thanks