<?
  IPS_LogMessage ("TestScript.ips.php", "TestScript Start:");
  $changes = IPS_GetSnapshotChanges(0);
  $changes = json_decode ($changes);                  // Decode json msg
  $FirstTimeStamp = $changes[0]->TimeStamp;
  IPS_LogMessage ("TestScript.ips.php", "FirstTimeStamp:" . $FirstTimeStamp);
  $binval = GetValueBoolean (37844);
  $timestamp = null;
  
  while ($binval == 0)
  {
    IPS_Sleep(500);
	$changes = IPS_GetSnapshotChanges($FirstTimeStamp);
	$changes = json_decode ($changes); 
	$timestamp = $changes[0]->TimeStamp;
	IPS_LogMessage ("TestScript.ips.php", "While timestamp:" . $timestamp);
    $binval = GetValueBoolean (37844);
  }
  $changes = IPS_GetSnapshotChanges($FirstTimeStamp);
  $changes = json_decode ($changes); 
  $timestamp = $changes[0]->TimeStamp;
  IPS_LogMessage ("TestScript.ips.php", "End timestamp:" . $timestamp);
  print_r($timestamp);

?>