Ideally the wpa_supplicant.conf could be configured, as explained here.
Previously an openwrt user had the same issue but for my 'weird' dragino version I cannot find the wpa_supplicant.conf file in /etc but theres a wireless file
root@dragino-227794:/etc/config# cat wireless
config wifi-device 'radio0'
option type 'mac80211'
option phy 'phy0'
option htmode 'HT20'
list ht_capab 'SHORT-GI-40'
list ht_capab 'DSSS_CCK-40'
option hwmode '11ng'
option disabled '0'
option noscan '1'
option txpower '17'
option channel '11'
option country 'DE'
config wifi-iface 'ap_0'
option device 'radio0'
option ifname 'wlan0'
option network 'lan'
option mode 'ap'
option hidden '0'
option maxassoc '30'
option disabled '0'
option encryption 'psk2'
option key 'dragino+dragino'
option ssid 'dragino-227794'
config wifi-iface 'sta_0'
option device 'radio0'
option ifname 'wlan0-2'
option mode 'sta'
option network 'wwan'
option encryption 'psk2'
option ssid 'Host-SSID'
option key 'Host-Passphrase'
option disabled '0'
root@dragino-227794:/etc/config#