Added Dahua NVR processor and sensors (#8570)

* Added Dahua NVR processor and sensors

* moved cpu

* updated proc data

includes/definitions/discovery/dahua-nvr.yaml

@@ -0,0 +1,19 @@
+mib: DAHUA-SNMP-MIB
+modules:
+    processors:
+        data:
+            -
+                oid: cpuUsage
+                num_oid: .1.3.6.1.4.1.1004849.2.1.3.{{ $index }}
+                descr: CPU Usage
+    sensors:
+        state:
+            data:
+                -
+                    oid: deviceStatus
+                    num_oid: .1.3.6.1.4.1.1004849.2.1.2.8.
+                    descr: 'Device Status'
+                    index: 'deviceStatus.{{ $index }}'
+                    states:
+                        - { value: 0, descr: Bad, graph: 1, generic: 2 }
+                        - { value: 1, descr: Good, graph: 1, generic: 0 }

includes/polling/os/dahua-nvr.inc.php

@@ -0,0 +1,32 @@
+<?php
+/**
+ * dahua-nvr.inc.php
+ *
+ * Dahua NVR OS polling
+ *
+ * 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  2018 Neil Lathwood
+ * @author     Neil Lathwood <gh+n@laf.io>
+ */
+
+$dahua_data = snmp_get_multi_oid($device, ['softwareRevision.0', 'serialNumber.0', 'deviceType.0'], '-OUQs', 'DAHUA-SNMP-MIB');
+
+$version  = $dahua_data['softwareRevision.0'];
+$serial   = $dahua_data['serialNumber.0'];
+$hardware = $dahua_data['deviceType.0'];
+
+unset($dahua_data);