Unable to send file in binary mode to ftp server using AIR application

Question

Hi,  Can any one help me. i am trying to send local files to ftp server  in binary mode from AIR application using sockets.
I cant use PASV mode for this FTP server because security restrictions. when i am trying to send Binary command i am always getting
error code 500 which is unrecognized command. I googled for solutions but i cant find any one using Binary mode to send data every example is using PASV mode to send
file.
code example:
private function upload():void{
sendCommand("binary ");
private function sendCommand(arg:String):void {
                                        arg +="\n";
                                        s.writeUTFBytes(arg);
                                        s.flush();
in response i am getting unrecognized command.

Answer 1

I'm successfully using an ftp example from http://http://projects.maliboo.pl/FlexFTP/
that I converted to spark and uses a popup progress window.
If you don't need to use sockets I can post a sample project.
I believe I still connect with PASV, but have no problems sending Binary files.
I don't think they're commands that are dependent on each other