Add OpenWrt OS support (discovery, poller) (#10454)

* Add OpenWrt OS support (discovery, poller)

* Add snmprec for Openwrt

* Update openwrt.inc.php

* Create openwrt.json

includes/definitions/openwrt.yaml

@@ -0,0 +1,15 @@
+os: openwrt
+text: OpenWrt
+type: network
+icon: openwrt
+over:
+    - { graph: device_bits, text: 'Device Traffic' }
+    - { graph: device_processor, text: 'CPU Usage' }
+    - { graph: device_mempool, text: 'Memory Usage' }
+discovery:
+    -
+      sysObjectID: .1.3.6.1.4.1.8072.3.2.10
+      snmpget:
+          oid: .1.3.6.1.4.1.2021.7890.1.101.1
+          op: starts
+          value: OpenWrt

includes/polling/os/openwrt.inc.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * Openwrt.inc.php
+ *
+ * LibreNMS os polling module for Tomato
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @package    LibreNMS
+ * @link       http://librenms.org
+ * @copyright  2016 Neil Lathwood
+ * @author     Neil Lathwood <neil@lathwood.co.uk>
+ */
+
+list($ignore, $version) = explode(' ', snmp_get($device, '.1.3.6.1.4.1.2021.7890.1.101.1', '-Osqnv'));
+$hardware = snmp_get($device, '.1.3.6.1.4.1.2021.7890.2.101.1', '-Osqnv');
+
+unset($ignore);