I'm trying to send 27 bytes of data to a device connected at the specified IP address and port but it's not sending the right data.
here's the code:

<?php

function spk($packet){
$result='';
foreach(str_split($packet,2) as $byte){
$result.=chr(hexdec($byte));
}
return $result;
}
//hex code of the bytes i want to send:
$packet= spk("32CD54AB13C664000000641B0002000400000001000000FF000000");
$host="192.168.0.53";
$port=900;
$sock = socket_create(AF_INET, SOCK_RAW, SOL_UDP);
echo socket_sendto($sock, $packet, strlen($packet), 0, $host, $port)." bytes";
socket_close($sock);
?>


i tried sniffing the data, and it looks like i sent:
00 00 64 1B 00 02 00 04 00 00 00 01 00 00 00 FF
00 00 00

but i need to send:
32 CD 54 AB 13 C6 64 00 00 00 64 1B 00 02 00 04
00 00 00 01 00 00 00 FF 00 00 00

so it looks like it's not sending the first word, so i tried prefixing it with 0's and F's, and the sniffer then shows the right data, but the device is still not responding (it should click when it gets those 27 bytes)

i also tried changing icmp, and tcp protocols, but no success.

any ideas?

edit:
It's also sending to the wrong port #, so i think the SOCKET_RAW allows me to specify the header and all that, so i tried adding 0384 to the header to send it to the right port, and it does show up that it's going to port 900 in the sniffer, but still no reaction.

When i try to use SOL_TCP, i get this error:

unable to write to socket [0]: A request to send or receive data was disallowed because the socket is not connected and (when sending on a datagram socket using a sendto call) no address was supplied.