Eek - its this one, but I'm using a Pi:

http://dev.iachieved.it/iachievedit/exploring-networkmanager-d-bus-systemd-and-raspberry-pi/

On Monday, November 16, 2015 at 9:16:30 AM UTC-6, Joe wrote:
>
> Take a look at Network Manager/DBus - 
> http://dev.iachieved.it/iachievedit/gauging-wireless-ap-stability-with-a-beaglebone-black/
>
> Disclaimer:  I'm the author of above post, but it shows how I detect 
> Ethernet/Wifi.
>
> On Saturday, November 14, 2015 at 3:06:00 PM UTC-6, dlchambers wrote:
>>
>> How can I detect:
>> a) If Cat5 ethernet has a live connection (to, say, a switch/router, 
>> though perhaps not to the internet)
>> b) If wifi has a live connection to
>>   i) AP
>>   ii) internet
>> c) If both ethernet and wifi are present, which adapter is the one I'm 
>> currently using?
>>
>> Many thanks,
>> -Dave
>>
>

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