Stale beacon slacker, only messages once

stalebacon.cna

# CNA script to alert on dead beacons. Doesn't repeat messages.
# author: noah @thesubtlety
# credit https://github.com/bluscreenofjeff/AggressorScripts/blob/master/stale-beacon-notifier.cna - bluescreenofjeff

$webhook_url = "https://hooks.slack.com/services/xxxxx";
$slack_channel = "#crackers";
%beacon_status = %();

# default stale value of 5 minutes (300000ms)
$stale_value = 300000;

on heartbeat_5m {
	foreach $beacon (beacons()) {
    	$computer = $beacon['computer'];
	    $pid = $beacon['pid'];
        $bid = $beacon['id'];

		if (($beacon["last"] > $stale_value) && ($beacon["pbid"] eq '')) {
            if (%beacon_status[$bid]["status"] eq "dead") {
                break;
            }

			%beacon_status[$bid] = %(status => "dead");
			$last_checkin = $beacon["last"] / 1000;
			println("The beacon on " . $beacon['computer'] . " hasn't checked in for " . $last_checkin . " seconds.");
			@curl_command = @('curl','-X','POST','--data-urlencode','payload={"username": "Continuous Op Bot", "icon_emoji": ":skeleton:", "channel": "' . $slack_channel . '", "text":"Beacon on ' . $beacon['computer'] . ' (' . $beacon['pid'] . ') now alive. "}',$webhook_url);
			exec(@curl_command);
		} else {
            %beacon_status[$bid] = %(status => "alive");
     }
	}
}