librenms-librenms/includes/discovery/fanspeeds/areca.inc.php

<?php

// Areca Fanspeeds
if ($device['os'] == 'areca') {
    $oids = snmp_walk($device, '1.3.6.1.4.1.18928.1.2.2.1.9.1.2', '-OsqnU', '');
    if ($debug) {
        echo $oids."\n";
    }

    if ($oids) {
        echo 'Areca ';
    }

    foreach (explode("\n", $oids) as $data) {
        $data = trim($data);
        if ($data) {
            list($oid,$descr) = explode(' ', $data, 2);
            $split_oid        = explode('.', $oid);
            $index            = $split_oid[(count($split_oid) - 1)];
            $oid              = '1.3.6.1.4.1.18928.1.2.2.1.9.1.3.'.$index;
            $current          = snmp_get($device, $oid, '-Oqv', '');

            discover_sensor($valid['sensor'], 'fanspeed', $device, $oid, $index, 'areca', trim($descr, '"'), '1', '1', null, null, null, null, $current);
        }
    }
}//end if