как отправить файл через curl на php

как с помощью curl перепрошить камеру?

Инструкция

Syntax http:///cgi-bin/upgrader.cgi?action=uploadFirmware

Method POST

Description Use this message to upload the firmware, and when the device receiving all the data successfully, it will start to upgrade the device, and then use the getState method to get the state.

Example

POST /cgi-bin/upgrader.cgi?action=uploadFirmware HTTP/1.1

Host: 192.168.1.108

Connection: keep-alive

Content-Type: multipart/form-data; boundary=---------------------------8655433224198

Content-Length: xxxxxxxxx

-----------------------------8655433224198

Content-Disposition:form-data;name="upgrade"; filename= "xxxxxx.bin"

Content-Type: application/octet-stream

Firmware data . -----------------------------8655433224198--

мой код

 $postdata = array(
  'Host' => "127.0.0.1",
  'Connection'=> "keep-alive",
  'Content-Type'=> "multipart/form-data; boundary=---------------------------8655433224198",
  'Content-Length'=> strlen($file),
  'Content-Disposition'=>'form-data;name="upgrade"; filename= "@xxx.bin"',
  'Content-Type'=> "application/octet-stream",
  'Firmware data' . "-----------------------------8655433224198--"
);


$options = array(
          CURLOPT_URL            => $url,
          CURLOPT_USERPWD        => $user . ":" . $pass,
          CURLOPT_RETURNTRANSFER => true,
          CURLOPT_TIMEOUT => 2,
          CURLOPT_POSTFIELDS => $postdata,
          CURLOPT_CONNECTTIMEOUT => 4,
  );