PHP script to switch Huawei Airtel dongle to NDIS mode in pfsense

lte.php

#!/usr/local/bin/php-cgi -f
<?php
sleep(5);

$cnt = 0;
$hw_addr = "$MAC_ADDRESS";
$found_hw = false;

// call usb mode switch
$cmd = 'timeout 7 /usr/local/sbin/usb_modeswitch -c /usr/local/share/usb_modeswitch/12d1:1f01 -v 12d1 -p 1f01 > /var/log/usb_modeswitch.log';
system($cmd);

while ($cnt < 10) {
  $out = shell_exec("ifconfig");
  if (strpos($out, $hw_addr) !== false) {
    $found_hw = true;
    break;
  }
  $cnt++;
  sleep(1);
}

if ($found_hw === false) {
  echo 'Cannot found hw';
  die();
}

// Starting interface as pfsense doesn't automatically do it when interface become available
shell_exec('/etc/rc.linkup interface=opt5 action=start');
die('Done\n');
?>