ScreenshotUpdated.php

<?php
namespace App\Events\Domains;

use App\Events\Event;
use App\Models\Domain;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
use Illuminate\Queue\SerializesModels;

class ScreenshotUpdated extends Event implements ShouldBroadcast
{

    use SerializesModels;

    public $domain;

    public function __construct(Domain $domain){
        $this->domain = $domain;
    }

    public function broadcastOn()
    {
        return [$this->domain->host];
    }

}