validatecredentials.php

<?php
    /**
     * Validate a user against the given credentials.
     *
     * @param Authenticatable $user
     * @param array $credentials
     * @return bool
     */
    public function validateCredentials(Authenticatable $user, array $credentials)
    {
        $host = $credentials['host-ip'];
        $username = $credentials['username'];
        $password = $credentials['password'];
        $mikrotik = new Mikrotik($host, $username, $password);
        if ($mikrotik->connected) {
            session([$username => $user]);
        }
        return $mikrotik->connected;
    }