Cronjob to send a notification AS SOON as the Android 7.1.2 beta is available for the Nexus 6P.

angler.712beta.cron.php

<?php
/** 
  * Android 7.1.2 beta for Nexus 6P email alert cronjob (Note: Requires PHP /w curl and being able to send mails!) 
  * 
  * 1. Download this script. 
  * 2. Set the value for the constant NOTIFY_MAIL_ADDRESS below to your email address. 
  * 3. Create a new cronjob (for a Win/Xampp alternative see: http://stackoverflow.com/a/4231634/624466). On your console, type: 
  *      crontab -e 
  * 4. Paste the following (adjust script/logfile path): 
  *      0 * * * * php /absolute/path/to/script.php >> /absolute/path/to/cronjob.log 
  * 5. Exit crontab and you're all set. You'll get an email as soon as the Android 7.1.2 beta OTA image is available for the Nexus 6P.
  */ 

// CHANGE THIS TO YOUR EMAIL ADDRESS !!! 
const NOTIFY_MAIL_ADDRESS = '[email protected]'; 

// NO NEED FOR CHANGES BELOW 

function getHttpResponse($url) { 
  $curl = curl_init($url); 
  curl_setopt_array($curl, [ 
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_CONNECTTIMEOUT => 30,
    CURLOPT_FOLLOWLOCATION => 1,
    CURLOPT_MAXREDIRS => 3,
    CURLOPT_SSL_VERIFYPEER => 0
  ]); 

  $resp = curl_exec($curl); 
  $code = curl_getinfo($curl, CURLINFO_HTTP_CODE); 
  curl_close($curl); 

  return 200 == (int)$code ? $resp : false; 
} 

function sendAlert($url) { 
  $msg = 'Strike! The Android 7.1.2 beta OTA image for the Nexus 6P is now online, too: ' . $url;
   mail(NOTIFY_MAIL_ADDRESS, 'Android 7.1.2  for Nexus 6P OTA Alert', $msg); 
   echo $msg . PHP_EOL; 
}

function checkAngler($str) {
  if (!$str || !is_string($str) || 0 == strlen($str)) {
    return false;
  }
  
  preg_match('/angler(.*?)\.zip/um', $str, $match);

  if (isset($match[1])) {
    $otaUrlRoot = 'http://storage-download.googleapis.com/androiddevelopers/shareables/preview/';
    $otaFile = sprintf('angler%s.zip', $match[1]);
    $otaUrl = $otaUrlRoot . $otaFile;
    return $otaUrl;
  }

  return false;
}

$betaUrl = 'https://developer.android.com/preview/download-712.html';
$str = getHttpResponse($betaUrl);

$otaUrl = checkAngler($str);
if (false !== $otaUrl) {
  sendAlert($otaUrl);
}