OK3568 4.19.206 Buildroot Configuring Static IP for Wi-Fi and Enabling Automatic Connection on Startup

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Revision History

Date	Version	Revision History
11/19/2024	V1.0	Initial Version

Configuring Static IP for Wi-Fi and Enabling Automatic Connection on Startup

Verified on Linux 5.10.160 Buildroot, just add mlan0 config in interfaces.

Note: This may cause the browser that comes with the board to be unusable:

Solution:

[root@ok3568:/]# rm /usr/share/matrix-gui-2.0/lock/qt

Modification Method

Connect to Wi-Fi and Determine the Network Segment:

[root@ok3568:/]# fltest_wifi.sh -i mlan0 -s test -p 12345678
wifi mlan0
ssid test
pasw 12345678
[  249.708244] IPv6: ADDRCONF(NETDEV_UP): mlan0: link is not ready
waiting...
try to connect again...
[  255.379720] IPv6: ADDRCONF(NETDEV_CHANGE): mlan0: link becomes ready
udhcpc: started, v1.27.2
udhcpc: sending discover
udhcpc: sending select for 192.168.109.47
udhcpc: lease of 192.168.109.47 obtained, lease time 3599
deleting routers
adding dns 192.168.109.149
Finshed!

Note down the bolded parts below, which correspond to: address, netmask, gateway.

[root@ok3568:/]# ifconfig mlan0
mlan0     Link encap:Ethernet  HWaddr E8:FB:1C:67:30:99
          inet addr:192.168.109.47  Bcast:192.168.109.255  Mask:255.255.255.0
          inet6 addr: fe80::eafb:1cff:fe67:3099/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:20 errors:0 dropped:0 overruns:0 frame:0
          TX packets:39 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:2676 (2.6 KiB)  TX bytes:4154 (4.0 KiB)

[root@ok3568:/]# route		//Query is slow, wait for ten seconds
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
default         192.168.109.149 0.0.0.0         UG    0      0        0 mlan0
192.168.109.0   *               255.255.255.0   U     0      0        0 mlan0

Check the wpa_supplicant configuration file:

[root@ok3568:/]# vi /etc/wpa_supplicant.conf

Below, the ssid is the Wi-Fi that will connect automatically, and psk is the password:

Modify the interfaces file:

[root@ok3568:/]# vi /etc/network/interfaces

Add the followings:

Comment out the gateway under eth0 to avoid conflicts.

Add the address, netmask, and gateway obtained in the first step to the mlan0 section:

Note: The address can be set to one in the same network segment. The detected address is 192.168.109.47, but it is set to 192.168.109.66.

Add the following code:

auto mlan0
iface mlan0 inet static
address 192.168.109.66
netmask 255.255.255.0
gateway 192.168.109.149
pre-up wpa_supplicant -B -Dnl80211 -imlan0 -c /etc/wpa_supplicant.conf

The last line ensures that the configuration from wpa_supplicant.conf is read every time before mlan0 starts up. Thus, after a reboot, don’t need to manually connect to Wi-Fi again.

After completing these settings, restart the development board, and you will see that the mlan0 IP has been changed to 192.168.109.66.

Verification

After restarting the development board, manually add the DNS:

[root@ok3568:/]# echo "nameserver 114.114.114.114" > /etc/resolv.conf

Test:

[root@ok3568:/]# ping www.forlinx.com
PING www.forlinx.com (211.149.226.120) 56(84) bytes of data.
bytes from 211.149.226.120: icmp_seq=1 ttl=47 time=51.7 ms
bytes from 211.149.226.120: icmp_seq=2 ttl=47 time=58.4 ms
bytes from 211.149.226.120: icmp_seq=3 ttl=47 time=56.3 ms
bytes from 211.149.226.120: icmp_seq=4 ttl=47 time=52.1 ms
bytes from 211.149.226.120: icmp_seq=5 ttl=47 time=52.0 ms

Add a startup script:

[root@ok3568:/]# vi /etc/init.d/S99-autowifi.sh

Grant executable permissions:

[root@ok3568:/]# chmod +x /etc/init.d/S99-autowifi.sh

[root@ok3568:/]# ping www.forlinx.com
PING www.forlinx.com (211.149.226.120) 56(84) bytes of data.
bytes from 211.149.226.120: icmp_seq=1 ttl=47 time=56.4 ms
bytes from 211.149.226.120: icmp_seq=2 ttl=47 time=58.6 ms
bytes from 211.149.226.120: icmp_seq=3 ttl=47 time=57.2 ms
bytes from 211.149.226.120: icmp_seq=4 ttl=47 time=155 ms
bytes from 211.149.226.120: icmp_seq=5 ttl=47 time=54.4 ms
bytes from 211.149.226.120: icmp_seq=6 ttl=47 time=52.0 ms
bytes from 211.149.226.120: icmp_seq=7 ttl=47 time=65.9 ms
bytes from 211.149.226.120: icmp_seq=8 ttl=47 time=68.1 ms
bytes from 211.149.226.120: icmp_seq=9 ttl=47 time=96.2 ms