public function discoverWirelessNoiseFloor()
    {
        $data = snmpwalk_cache_oid($this->getDeviceArray(), 'lcsStatusWlanRadiosEntryNoiseLevel', [], 'LCOS-MIB');
        $radios = $this->getCacheByIndex('lcsStatusWlanRadiosEntryIfc', 'LCOS-MIB');