wpa_cli
> select_network 0
> enable_network 0
> save
> quit
systemctl enable wpa_supplicant
busybox udhcpc -i wlan0
if that doesn't completely solve it, you may have to re-edit your /etc/wpa_supplicant/wpa_supplicant.conf
remove ap_scan=1
remove group=WEP104 WEP40
add scan_ssid=1
add auth_alg=OPEN
I am sorry I don't have the exact answer, but it is trial and error add/remove the above lines in combination.