Support Radio Capacity for single radio Unifi APs

[mbwall]

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Currently the Unifi poller assumes that devices have 2 radios. Some APs however only have one (2.4GHz), and so the poller errors when trying to get the Radio Capacity for those devices.

Notice in the poller output:
Error in packet
Reason: (noSuchName) There is no such variable name in this MIB.
Failed object: unifiRadioCuTotal.1

If the relevant portions are removed from /includes/polling/mib/ubnt-unifi-mib.inc.php then the result is accurate for a single radio:
unifiRadioCuTotal.0 = 13
unifiRadioCuSelfRx.0 = 3
unifiRadioCuSelfTx.0 = 8
unifiRadioOtherBss.0 = 0

This also means that the Wireless Clients graph always shows 2 Radios, even though the second one will always have values of 0.

I don't have an AP with 2 radios to test, but I think the number may be available by looking in unifiRadioTable ( .1.3.6.1.4.1.41112.1.6.1.1)

[geordish]

I'm looking for feedback on WiFi related stuff here:

https://community.librenms.org/t/improve-wifi-collection-and-graphing-code/453/2

Any chance of providing feedback?

[laf]

Moved to https://community.librenms.org/t/improve-wifi-collection-and-graphing-code/453/4

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