Added Moxa switching ifAlias/portName mapping

[rhinoau]

The Moxa human-edited port descriptions/names are not accessible in IF-MIB.

A default port with a custom 'name' added is as below:

interface ethernet 1/5
 no shutdown
 name pr1_G1_name
 speed-duplex Auto
 media cable-mode auto
 no flowcontrol
 no gmrp
 mcast-filter forward-unknown
 switchport access vlan  1
 rate-limit port-disable ingress rate none
 no ptp
!

Event log showing some names being ingested with correct indexes:

I'm not excited about having to do it this way, but I need the custom port descriptions from the device.

Each Moxa EDS model has a unique MIB/sysObjectID, but is seems like stable mapping within them to the portTable at {sysObjectID}.1.9.1

I have tested across 2 models I have on my desk and they both work as intended, but with my limited PHP foo I can't find a nicer way to do it and leaving as WIP so I can learn what better ways we might find.

I'm ashamed of my OID hackery to obtain index, and had some troubles getting clean accessible info from the snmpwalk_cache_xxx variants that I could walk without tripping over.

Hoping someone may also have some other models to test against.

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[rhinoau]

Open to better ways, but removing WIP to progress.

[murrant]

I mean, it is garbage the the workaround is needed and that it is this obtuse, but I don't think there is an alternative.

[librenms-bot]

This pull request has been mentioned on LibreNMS Community. There might be relevant details there:

https://community.librenms.org/t/22-12-0-changelog/20474/1