Added an option to rediscover a device from the web page

html/forms/rediscover-device.inc.php

@@ -0,0 +1,30 @@
+<?php
+
+/*
+ * LibreNMS
+ *
+ * Copyright (c) 2014 Neil Lathwood <https://github.com/laf/ http://www.lathwood.co.uk/fa>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.  Please see LICENSE.txt at the top level of
+ * the source code distribution for details.
+ */
+
+if(!is_numeric($_POST['device_id'])) {
+    $status = "error";
+    $message = "Invalid device id";
+} else {
+    $update = dbUpdate(array('last_discovered' => 'NULL'), 'devices', '`device_id` = ?', array($_POST['device_id']));
+    if(!empty($update) || $update == '0') {
+       $status = "ok";
+       $message = "Device will be rediscovered";
+    } else {
+         $status = "error";
+         $message = "Error rediscovering device";
+    }
+}
+$output = array("status" => $status, "message" => $message);
+header("Content-type: application/json");
+echo _json_encode($output);