/**
  * Fetches all inbound messages for given accounts (normally triggered via cron)
  * @param TxttoolsAccount[] $txttoolsAccounts The accounts to check
  * @return MoodletxtInboundMessage[] Inbound messages found
  * @version 2015062901
  * @since 2010090301
  */
 public function getInboundMessages($txttoolsAccounts = array())
 {
     $responses = array();
     $lastUpdate = get_config('moodletxt', 'Inbound_Last_Update');
     foreach ($txttoolsAccounts as $account) {
         try {
             $requests = $this->XMLBuilder->buildInboundMessageRequest($account, 0, 'ALL', $lastUpdate);
             $response = $this->outboundConnector->sendData($requests, $account);
             $this->XMLParser->setTxttoolsAccountObject($account);
             // Needed to set destination account
             $responses = array_merge($responses, $this->XMLParser->parse($response));
         } catch (Exception $ex) {
             file_put_contents('C:\\moodle.log', time() . ': cron inbound poll failed for account (' . $account->getUsername() . '@' . $account->getUrl() . ') -> ' . $ex->getMessage(), FILE_APPEND);
         }
     }
     set_config('Inbound_Last_Update', time(), 'moodletxt');
     return $responses;
 }