<?php 
private function fetchData()
    {
        if (is_null($this->data)) {
            // wAP 60G device uses the mtxrWl60GTable and mtxrwl60GStaTable
            // (does not use normal mtxrWlApTable or mtxrWlStatTable).
            // https://wiki.mikrotik.com/wiki/Manual:Interface/W60G#SNMP_OIDs_for_monitoring

            // Try to walk a wAP 60G table
            $wl60 = snmpwalk_cache_oid(
                $this->getDevice(),
                'mtxrWl60GTable',
                array(),
                'MIKROTIK-MIB'
            );

            if ( !empty($wl60) ) {
                // This is a wAP 60G, get only the wAP 60G tables
                $wl60sta = snmpwalk_cache_oid(
                    $this->getDevice(),
                    'mtxrWl60GStaTable',
                    array(),
                    'MIKROTIK-MIB'
                );
                $this->data = $wl60+$wl60sta;
            } else {
                // Get regular AP + Station tables
                // Device may be in both AP and Station mode using multiple
                // radios (or one radio with Virtual AP/STA feature)
                $wlap = snmpwalk_cache_oid(
                    $this->getDevice(),
                    'mtxrWlApTable',
                    array(),
                    'MIKROTIK-MIB'
                );
                $wlsta = snmpwalk_cache_oid(
                    $this->getDevice(),
                    'mtxrWlStatTable',
                    array(),
                    'MIKROTIK-MIB'
                );
                $this->data = $wlap+$wlsta;
            }
        }
        return $this->data;
    }
?>