librenms-librenms/includes/polling/os/ciscosb.inc.php

<?php
/*
 * LibreNMS Cisco Small Business OS information module
 *
 * Copyright (c) 2015 Mike Rostermund <mike@kollegienet.dk>
 * 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 ($poll_device['sysObjectID'] == '.1.3.6.1.4.1.9.6.1.89.26.1') {
    $hardware = 'SG220-26';
} else {
    $hardware = str_replace(' ', '', snmp_get($device, 'rlPhdUnitGenParamModelName.1', '-Ovq', 'CISCOSB-Physicaldescription-MIB'));
}

$version  = snmp_get($device, 'rlPhdUnitGenParamSoftwareVersion.1', '-Ovq', 'CISCOSB-Physicaldescription-MIB');
$serial   = snmp_get($device, 'rlPhdUnitGenParamSerialNum.1', '-Ovq', 'CISCOSB-Physicaldescription-MIB');
$features = snmp_get($device, 'rlPhdUnitGenParamServiceTag.1', '-Ovq', 'CISCOSB-Physicaldescription-MIB');