liwo/app/Notifications/SocketNotification.php

<?php

namespace App\Notifications;

use App\Channels\Messages\SocketMessage;
use Illuminate\Bus\Queueable;
use Illuminate\Contracts\Queue\ShouldQueue;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Notifications\Notification;

class SocketNotification extends Notification
{
    use Queueable;

    public $message;

    /**
     * Create a new notification instance.
     *
     * @return void
     */
    public function __construct($message)
    {
        $this->message = $message;
    }

    /**
     * Get the notification's delivery channels.
     *
     * @param  mixed  $notifiable
     * @return array
     */
    public function via($notifiable)
    {
        return ['socket'];
    }

    /**
     * Get the socket representation of the notification.
     *
     * @param  mixed  $notifiable
     * @return SocketMessage
     */
    public function toSocket($notifiable)
    {
        return (new SocketMessage())
            ->data([
                'message' => $this->message['message'],
                'payload' => $this->message['payload'],
            ]);
    }
}