sudo iw dev wlan0 scan | grep SSID
        SSID: BHL5G
        SSID: BHL
        SSID: Kviknet-Bruun2.4GHz
                 * SSID List
        SSID: BHL5G
        SSID: BHL5G_5G
        SSID: Kviknet-Bruun5GHz
                 * SSID List
        SSID: Villy_24E
                HESSID: 00:00:00:00:00:00
        SSID: HP-Print-73-ENVY 4500 series
        SSID:

#  cat /etc/wpa_supplicant.conf
ctrl_interface=/var/run/wpa_supplicant
ctrl_interface_group=0
ap_scan=1
update_config=1

network={
        ssid="Mercantec"
        psk="My-SECRET"
        key_mgmt=WPA-PSK
}
#  wpa_cli -i wlan0 reconfigure