The tag maps to the IFLA_INFO_KIND (part of the IFLA_LINKINFO)
netlink attribute.
This attribute is only available on virtual interfaces. Examples of
valid values are:
* bond
* bridge
* gre
* tun
* veth
This tag maps to the ifinfomsg->ifi_type member, which is set to one
of the ARPHRD_xyz values, defined in linux/if_arp.h.
There's a *ton* of them, and we can't possibly add a string mapping
for _all_ of them, so for now, set to one of:
* loopback
* ether
* wlan
* ARPHRD_NNN, where N is a number
Exports two new tags from network module, `ul-speed` and `dl-speed`.
Because these work through polling, poll-interval must be set.
Otherwise, these two tags always will be 0.
This adds a new ‘poll-interval’ option to the network module. When set
to a non-zero value, the following Wi-Fi stats will be updated:
* Signal strength
* RX+TX bitrate
