Configuration of a wifi client in openWrt

For working with wifi in openWrt there is a script /sbin/wifi. The file /etc/config/wireless is responsible for wifi configuration.

The the configuration file can be created by default having run the following:

wifi detect > /etc/config/wireless

It will look as follows:

config wifi-device  radio0 
	option type     mac80211 
	option channel  11 
	option hwmode	11g 
	option path	'pci0000:00/0000:00:1c.2/0000:05:00.0' 

	option disabled 1 

config wifi-iface 
	option device   radio0 
	option network  lan 
	option mode     ap 
	option ssid     OpenWrt 
	option encryption none

Let's change it under our configuration.
The file /etc/config/wireless is for open network:

config wifi-device  radio0 
	option type     mac80211 
	option channel  'auto' 
	option hwmode	11g 
	option path	'pci0000:00/0000:00:1c.2/0000:05:00.0' 
	option disabled 0 

config wifi-iface 
	option device   radio0 
	option network  wwan 
	option mode     sta 
	option ssid     testwifi
	option encryption none

The file /etc/config/wireless is for encrypted network:

config wifi-device 'radio0' 
        option type 'mac80211' 
        option channel '6' 
        option hwmode '11ng' 
        option path 'pci0000:00/0000:00:1c.2/0000:05:00.0' 
        option disabled '0' 

config wifi-iface
        option device 'radio0' 
        option network 'wwan' 
        option mode 'sta' 
        option ssid 'testwifi' 
        option encryption 'psk2' 
        option key '1234567890'

sta — is a client mode; ap — is an access point mode

For automatic receiving the address via dhcp it is necessary to create the interface in file/etc/config/network:

config interface wwan 
	option proto 'dhcp'

Let's run the following commands for applying of new settings:

/etc/init.d/network restart

At the stage of OpenWrt configuration wpa-supplicant is to be selected, in the different way wifi will not be linked up by the script openWrt /sbin/wifi:

	<*> wpa-supplicant

The running of «wifi down» makes wifi disable and results in missing of interface wlan0.

The running of «wifi up» links up the interface wlan0 and the network is connected.

By successful completing of operation there will be approximately the following log on the screen:

wifi up 
Successfully initialized wpa_supplicant
[   10.975345] iwl3945 0000:05:00.0: loaded firmware version 
[   14.670591] wlan0: authenticate with bc:ae:c5:c3:ab:d5 
[   14.673644] wlan0: send auth to bc:ae:c5:c3:ab:d5 (try 1/3) 
[   14.675760] wlan0: authenticated 
[   14.676031] iwl3945 0000:05:00.0: wlan0: disabling HT as WMM/QoS is not supported by the AP 
[   14.676335] iwl3945 0000:05:00.0: wlan0: disabling VHT as WMM/QoS is not supported by the AP 
[   14.680246] wlan0: associate with bc:ae:c5:c3:ab:d5 (try 1/3) 
[   14.682727] wlan0: RX AssocResp from bc:ae:c5:c3:ab:d5 (capab=0x401 status=0 aid=1) 
[   14.684368] wlan0: associated 

Error introducing is possible (if there is no wpa-supplicant) :

wifi up 
command failed: Device or resource busy (-16) 

It is possible to be connected to the network in a manual mode by the following command:

iw dev wlan0 connect -w testwifi