Kraken\Channel\Model\Socket\Socket::unicast PHP Method

    public function unicast($id, $message, $flags = Channel::MODE_STANDARD)
    {
        $status = $this->sendMessage($id, self::COMMAND_MESSAGE, $message, $flags);
        if ($status === static::SEND_STATUS_SUCCEEDED) {
            $this->emit('send', [$id, (array) $message]);
        }
        return $status > 0;
    }