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);
    }
  }
}

?>