Mikrotik scheduler script to check AdGuardHome availability, by resolving to AGH server then change DNS if AGH is not resolving

mikrotik_watchdog_dns.txt

:local curDNS [/ip dns get server]
:local gwDNS "192.168.2.1"
:local aghDNS "172.17.0.99"
:local aghDNS "192.168.2.66"
:local oriDNS "8.8.8.8,8.8.4.4"
:local testDomain "www.google.com"

:local isDown "no"

:if ($curDNS = $aghDNS) do={
    :do {
        :resolve $testDomain server=$aghDNS

    } on-error={
        :set isDown "yes"
        :log warning "AGH is seems down, checking number 1"
        :delay 1
    }

    :for i from=2 to=7 do={
        :if ($isDown = "yes") do={
            :do {
                :resolve $testDomain server=$aghDNS
            } on-error={
                :log warning "AGH is seems down, checking number $i"
                :delay 1
            }
        }
    }

    :if ($isDown = "yes") do={
        :log warning "AdGuardHome Offline"

        /ip dns set servers=$oriDNS
        /ip dhcp-server network set [find] dns-server=$gwDNS

    }

} else={
    :do {
        :resolve $testDomain server=$aghDNS
        :log warning "AdGuardHome Online"

        /ip dns set servers=$aghDNS
        /ip dhcp-server network set [find] dns-server=$aghDNS

    } on-error={}
}