librenms-librenms/includes/polling/os/rutos-2xx.inc.php

<?php
$rutos_2xx_tmp = snmp_get_multi_oid($device, ['RouterName.0', 'ModemSerial.0', 'FirmwareVersion.0'], '-OUQs', 'TELTONIKA-MIB');
$hardware = $rutos_2xx_tmp['RouterName.0'];
$serial   = $rutos_2xx_tmp['ModemSerial.0'];
$version  = $rutos_2xx_tmp['FirmwareVersion.0'];


use LibreNMS\RRD\RrdDefinition;

# Mobile Data Usage
$tlt_array = array(
    '.1.3.6.1.4.1.48690.2.11.0',
    '.1.3.6.1.4.1.48690.2.10.0',
);

$usage = snmp_get_multi_oid($device, $tlt_array);

$usage_sent = $usage['.1.3.6.1.4.1.48690.2.11.0'];
$usage_received = $usage['.1.3.6.1.4.1.48690.2.10.0'];

if ($usage_sent >= 0 && $usage_received >= 0) {
    $rrd_def = RrdDefinition::make()
        ->addDataset('usage_sent', 'GAUGE', 0)
        ->addDataset('usage_received', 'GAUGE', 0);
    
        $fields = array(
        'usage_sent' => $usage_sent,
        'usage_received' => $usage_received,
        );

        $tags = compact('rrd_def');
        data_update($device, 'rutos_2xx_mobileDataUsage', $tags, $fields);
        $graphs['rutos_2xx_mobileDataUsage'] = true;
}