manual eth2
iface eth2 inet dhcp
    pre-up wifi xm711
    pre-up wpa_passphrase "SSID" "password" >/tmp/wpa_supplicant.conf
    pre-up sed -i '2i \\tscan_ssid=1' /tmp/wpa_supplicant.conf
    pre-up (sleep 3; wpa_supplicant -B -D nl80211 -i eth2 -c/tmp/wpa_supplicant.conf)
    post-down killall -q wpa_supplicant