Check /sys/class/ieee80211 before opening netlink sockets. Looking up
the
nl80211 family while cfg80211 is not loaded makes the kernel run
modprobe,
which loads the module on hosts without wireless hardware, or fails
again
on every poll when the module is unavailable.
mdlayher/wifi only dumps stations, which some full-MAC drivers (e.g.
out-of-tree Realtek USB) answer with an empty list, leaving RSSI
unavailable. Request the associated BSSID's station directly, as
`iw link` does, and parse it with native.ParseStationInfo.
- Info.WiFi uses json "wf" with omitempty so systems without Wi-Fi no
longer store/broadcast "wifi":null
- move osascript exec into wifi_darwin.go; drop unused commandRunner
- share strongest-connection logic between table cell and sorting
- trim agent/wifi README
Stats.WiFi is now map[string]int8 (json "wf") holding only available
RSSI
readings; SSID and unavailable signals stay in Info.WiFi. Averages are
rounded to whole dBm.
Wi-Fi is collected only on the default 60s interval; real-time requests
reuse the last snapshot to avoid spawning osascript / dumping the BSS
cache every second.
