mikrotik routeros update check script - based on https://ondra.sluka.cz/posts/2023-06-13-mikrotik-check-for-updates/ but more robust

check-for-updates.txt

# Check for updates and mail admin if available
:local emailAddress "[email protected]"

# Set the update channel and check for updates
/system package update set channel=development
/system package update check-for-updates

# Get current version information
:local currver [/system package update get installed-version]
:local newver [/system package update get latest-version]
:local status [/system package update get status]

# Get the script ID first to properly reference it
:local scriptID [/system script find where name="check-for-updates"]
:if ([:len $scriptID] = 0) do={
    :log warning "Script 'check-for-updates' not found"
} else={
    # Get the current comment value
    :local lastnotifver [/system script get $scriptID comment]
    
    # Debug output to log
    :log info "Debug - currver: $currver, newver: $newver, lastnotifver: $lastnotifver, status: $status"
    
    # Always update the comment with the current version, regardless of status
    /system script set $scriptID comment=$newver
    :log info "Updated script comment to: $newver"
    
    # Only send email if there's a new version available
    :if ($currver != $newver and $newver != $lastnotifver) do={
        :log info "Software update available ($currver -> $newver). Sending email..."
        :local hostname [/system identity get name]
        /tool e-mail send to="$emailAddress" subject="[$hostname] Software Update Available: $newver" \
            body="A new update is available for your MikroTik device: $currver -> $newver"
    }
}

schedule.txt

/system scheduler add interval=1d name=check-for-updates on-event=check-for-updates policy=read,write,policy,test start-date=may/1/2025 start-time=16:00:00