/// <inheritdoc />
protected override bool RetrieveRxSignalStrength()
{
Stopwatch durationWatch = Stopwatch.StartNew();
DeviceSpecificOid singleOid;
if (this.OidLookup.TryGetValue(RetrievableValuesEnum.RxSignalStrengthImmediateOid, out singleOid) && !singleOid.Oid.IsNull)
{
this.RxSignalStrengthBacking = this.LowerSnmpLayer.QueryAsInt(singleOid.Oid, "RSSI single value");
this.RecordCachableOid(CachableValueMeanings.WirelessRxSignalStrength, singleOid.Oid);
}
else
{
RetrievableValuesEnum[] valuesToQuery =
{
RetrievableValuesEnum.RxSignalStrengthCh0AppendMacAndInterfaceId,
RetrievableValuesEnum.RxSignalStrengthCh1AppendMacAndInterfaceId,
RetrievableValuesEnum.RxSignalStrengthCh2AppendMacAndInterfaceId
};
DeviceSpecificOid[] deviceSpecificOids = new DeviceSpecificOid[valuesToQuery.Length];
DeviceSpecificOid[] oidValues;
if (!this.OidLookup.TryGetValues(out oidValues, valuesToQuery))
{
log.Warn($"Not even one supported OID has been found for getting the stream-specific RX level. RxSignalStrength for device '{this.DeviceAddress}', interface ID {this.InterfaceId}, cannot be retrieved.");
this.RxSignalStrengthBacking = double.NegativeInfinity;
return(true);
}
var clientSpecificOids = oidValues.Where(oid => oid != null).Select(oid => {
var interfaceTypeOid = oid.Oid + this.RemoteMacString.HexStringToByteArray().ToDottedDecimalOid() + new Oid(new int[] { this.InterfaceId.Value });
return(interfaceTypeOid);
});
var queryResults = this.LowerSnmpLayer.QueryAsInt(clientSpecificOids, "wireless peer info, RX signal strength");
this.RecordCachableOids(CachableValueMeanings.WirelessRxSignalStrength, clientSpecificOids);
// Note: As the SNMP cannot return -infinity MikroTik devices return 0.
// Hence we effectively skip 0 values here assuming that stream is not in use.
this.RxSignalStrengthBacking = queryResults.Values.Where(v => v != 0).DecibelLogSum();
}
durationWatch.Stop();
this.localQueryDuration += durationWatch.Elapsed;
return(true);
}
/// <inheritdoc />
public bool TryGetValues(out DeviceSpecificOid[] oidValues, params RetrievableValuesEnum[] valuesToQuery)
{
bool atLeastOneFound = false;
oidValues = new DeviceSpecificOid[valuesToQuery.Length];
for (int i = 0; i < valuesToQuery.Length; i++)
{
DeviceSpecificOid value;
if (this.localLookup.TryGetValue(valuesToQuery[i], out value))
{
atLeastOneFound = true;
oidValues[i] = value;
}
else
{
oidValues[i] = null;
}
}
return(atLeastOneFound);
}
/// <inheritdoc />
public bool TryGetValue(RetrievableValuesEnum key, out DeviceSpecificOid value)
{
return(this.localLookup.TryGetValue(key, out value));
}