When I install the network-manager snap and list local WiFi connections with the command nmcli d wifi list, I see multiple entries named --. What are these? Neither the network-manager documentation nor the nmcli help text give me any clue. Are they hidden networks?
example output:
* SSID MODE CHAN RATE SIGNAL BARS SECURITY
Rigado-Guest Infra 1 54 Mbit/s 97 ▂▄▆█ WPA2
Rigado-Corp-PDX Infra 1 54 Mbit/s 95 ▂▄▆█ WPA2
Rigado-Corp-PDX Infra 1 54 Mbit/s 80 ▂▄▆_ WPA2
Rigado-Guest Infra 1 54 Mbit/s 79 ▂▄▆_ WPA2
-- Infra 8 54 Mbit/s 74 ▂▄▆_ WPA2
Rigado-Guest Infra 6 54 Mbit/s 72 ▂▄▆_ WPA2
* Rigado-Corp-PDX Infra 157 54 Mbit/s 71 ▂▄▆_ WPA2
Rigado-Corp-PDX Infra 6 54 Mbit/s 70 ▂▄▆_ WPA2
-- Infra 1 54 Mbit/s 64 ▂▄▆_ WPA2
XFINITY Infra 6 54 Mbit/s 64 ▂▄▆_ WPA2 802.1X
Rigado-Corp-PDX Infra 149 54 Mbit/s 62 ▂▄▆_ WPA2
xfinitywifi Infra 6 54 Mbit/s 60 ▂▄▆_
Rigado-Guest Infra 149 54 Mbit/s 60 ▂▄▆_ WPA2
Rigado-Corp-PDX Infra 36 54 Mbit/s 59 ▂▄▆_ WPA2
Rigado-Guest Infra 36 54 Mbit/s 59 ▂▄▆_ WPA2
XFINITY Infra 11 54 Mbit/s 40 ▂▄__ WPA2 802.1X
xfinitywifi Infra 1 54 Mbit/s 35 ▂▄__
XFINITY Infra 157 54 Mbit/s 32 ▂▄__ WPA2 802.1X
xfinitywifi Infra 157 54 Mbit/s 29 ▂___