Acts as client(WiFi STA) in OpenWRT, connect and download the package when luci haven't installed

Quick config device
wifi config

Enable wlan0
In /etc/config/wireless,
option disabled '0'

Turn on wlan0
wifi up

Turn off wlan0
wifi down

Scan AP
iw wlan0 scan

Connect to AP
In /etc/config/wireless,
config wifi-iface 'wifinet0'
option ssid 'my_ap'
option device 'radio0'
option mode 'sta'
option network 'my_wlan'
option key 'my_password'
option encryption 'psk2' #AP encryption mode

In /etc/config/network,
config interface 'my_wlan'
option proto 'dhcp'
service network restart