WAS-110 Multicast Upgrader

multicast_upgrader.php

<?php
$source_ip = '192.168.1.2';
$source_port = 0;
$dest_ip = '192.168.1.1';
$dest_port = 13456;
$block_size = 1436;
###############################################################################

function _err(string $message = '', int $code = 1): void {
    if (strlen($message))
        fwrite(STDERR, "$message\n");

    exit($code);
}

$opts = array(
    'socket' => array(
        'bindto' => "$source_ip:$source_port",
    ),
);
$context = stream_context_create($opts);
$stream = stream_socket_client("udp://{$dest_ip}:$dest_port", $errno, $errstr, 1.0, STREAM_CLIENT_CONNECT, $context);

$file = 'multicast_upgrade.img';
if (!file_exists($file))
    _err("File '$file' does not exist.");

$size = filesize($file);
if ($size < 1)
    _err("No data to send.");

$upgrade = str_split(file_get_contents('multicast_upgrade.img'), $block_size);
$packets = count($upgrade);
var_dump($packets);

if ($packets > 65536)
    _err("File too large.");

while(true) {
    foreach ($upgrade as $packet => $data) {
        $header = pack("NNNN", ($packet + 1), $block_size, 1, $size);
        $header .= "bfw-HGW\0\0\0\0\0\0\0\0\0\0\0\0\0";

        stream_socket_sendto($stream, $header.$data);
        usleep(100);

//        if ($packet > 10)
//            break 2;
    }
}