DART-6UL/VAR-SOM-MX7 Wireless LAN
Test
Scan for wireless networks:
$ ifconfig wlan0 up $ iw dev wlan0 scan | grep SSID
Connecting to a WPA encrypted network:
If you are using Krogoth distro, please remember that Wifi interface is controlled by connman.
Before continuing with this procedure, remember to disable wifi control running
$ connmanctl disable wifi
If you are using Debian, please note that Wifi interface is controlled by Network Manager.
Before continuing with this procedure, remember to disable wifi control running
$ nmcli radio wifi off
Find your network from the above scan command.
$ mv /etc/wpa_supplicant.conf /etc/wpa_supplicant.conf.org $ wpa_passphrase <YourAP> <YourPassword> >/etc/wpa_supplicant.conf $ wpa_supplicant -B -Dnl80211 -iwlan0 -c/etc/wpa_supplicant.conf
Check link:
$ iw dev wlan0 link
Disable eth0:
$ ifconfig eth0 down $ ifconfig eth1 down
Run DHCP:
$ udhcpc -iwlan0 $ ifconfig
Check link speed:
iperf3 server (on Target/Host):
$ ifconfig (to get the IP address) $ iperf3 -s
iperf3 client (on Host/Target):
$ iperf3 -c <IP_ADDRESS_OF_IPERF_SERVER>
Useful link for common iw commands: https://wiki.archlinux.org/index.php/Wireless_network_configuration#Manual_setup
Access Point
This example will demonstrate you how to use the board as an access point. It will forward packets from wlan0 to eth0. DHCPD:
$ vi /etc/udhcpd.conf # Sample udhcpd configuration file (/etc/udhcpd.conf) # The start and end of the IP lease block start 192.168.5.20 #default: 192.168.0.20 end 192.168.5.25 #default: 192.168.0.254 # The interface that udhcpd will use interface wlan0 #default: eth0 #Example opt dns 8.8.8.8 8.8.4.4 # public google dns servers option subnet 255.255.255.0 opt router 192.168.5.1 option lease 864000 # 10 days of seconds
This is a network example. You need to set the IP address based on your network.
Wireless configuration can be setup in file /etc/hostapd.conf before launching hostapd for configuring access point name, requiring password, etc.
For example:
$ vi /etc/hostapd.conf You can set the following parameters: ssid=VARI_AP wpa=2 rsn_pairwise=CCMP wpa_passphrase=12345678 wpa_key_mgmt=WPA-PSK
Ensure that wpa_supplicant is not holding the device
$ killall wpa_supplicant $ killall hostapd
IP Forwarding:
$ echo 1 > /proc/sys/net/ipv4/ip_forward $ ifconfig wlan0 192.168.5.1 $ hostapd -B /etc/hostapd.conf -P /var/run/hostapd.pid $ udhcpd /etc/udhcpd.conf $ iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
As a next step one should take a look at iw utility which can be used for configuring some parameters https://wireless.wiki.kernel.org/en/users/documentation/iw
Note on DART-6UL WIFI initialization
On DART-6UL SOM WIFI and SD card share the same SDIO controller and therefore cannot be used simultaneously. The choice to use either WIFI or SD card is made by selecting the appropriate device tree. WIFI initialization script looks for "WIFI" string in machine description property of device tree (accessible via /sys/devices/soc0/machine) to determine that WIFI device tree was selected. Please bear this in mind when making DTS modifications.