Configuration of AP hotspot on xunwei-imx6ull development board

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The development board connects the power supply and debug the serial port , Then open the debug serial port terminal , Then power up the development board , Wait for the system to start complete , Pictured 99.6.1 Shown ：

And then make chapter five U The disk is inserted into the development board  USB  Interface , You can see that the serial port prints out USB Device information , Pictured 99.6.2 Shown ：

We are debugging the serial terminal input “df” command , You can see U Disk mount Directory , The operation result is as shown in the figure 99.6.3 Shown ：

Next, we are debugging the serial terminal input “cd /run/media/sda1/hostap” command , Go to what we created in Chapter 5 “hostap” Folder , Pictured 99.6.4 Shown ：

We type in “ls” command , You can see the file copied in Chapter 5 , Pictured 99.6.5 Shown ：

And then we use cp Command copy “ lib_nl.tar.gz ” and “ openssl.tar.gz ” To the system directory “ /usr/lib ” Catalog Next , The operation result is as shown in the figure 99.6.6 Shown ：

And then we use “cd /usr/lib” command , Enter into “/usr/lib” Under the table of contents , Pictured 99.6.7 Shown ：

Then type in “ tar -xvf lib_nl.tar.gz ” and “ tar -xvf openssl.tar.gz ” These two commands , decompression libnl and openssll Library file to the current directory （ Because what I'm using here is yocto file system , The system has been installed libnl and openssll The library file of , So I don't decompress , If you use other file systems , You need to decompress it here ）.
Then back U Disk directory , Copy “hostapd.conf”,“udhcpd.conf”,“udhcpd.leases” To systematic “/etc” Under the table of contents , Pictured 99.6.8 Shown ：

hostapd.conf Files are settings AP Network name of the hotspot , And the password , It reads as follows ：
ctrl_interface=/var/run/hostapd
interface=wlan0
driver=nl80211
ssid=Topeet_TEST
channel=1
macaddr_acl=0
auth_algs=1
hw_mode=g
ignore_broadcast_ssid=0
wpa=2
wpa_passphrase=123456780
wpa_key_mgmt=WPA-PSK
wpa_pairwise=TKIP
rsn_pairwise=CCMP
above ssid yes wifi The name of （Topeet_test）,wpa_passphrase yes wifi Password （1234567890）.
udhcpd.conf The file is configuration dhcp Of , The contents are as follows ：
start 192.168.0.2
end 192.168.0.100
interface wlan0
max_leases 20 #default: 254
remaining yes #default: yes
auto_time 7200
decline_time 3600
conflict_time 3600
offer_time 60
min_lease 60
lease_file /etc/udhcpd.leases
opt dns 10.221.0.11 8.8.8.8
option subnet 255.255.255.0
opt router 192.168.0.1
Start and end It specifies wifi The distribution of IP Address range （192.168.0.2-192.168.0.100）, Other parameters can be found on the Internet , I won't talk about it in detail here .
Then copy “hostapd” To systematic “/usr/sbin” Catalog , Pictured 99.6.9 Shown ：

because yocto File system usage rfkill Command to manage wifi and bluetooth , First of all, we are debugging the serial terminal input “rfkill unblock wifi” To open wifi（ If you don't use yocto file system , You can ignore the next step ）, The operation result is as shown in the figure 99.6.10 Shown ：

And then in the debug serial port input “ifconfig wlan0 192.168.0.1 up” command , To configure wlan0 Of ip, And enable the wlan, Pictured 99.6.11 Shown ：

And then in the debug serial port input “hostapd -B /etc/hostapd.conf -dd” Start AP hotspot , The operation result is as shown in the figure 99.6.12 Shown ：

And then in the debug serial port input “udhcpd -fS /etc/udhcpd.conf &”, Turn on dhcp server service （udhcpd This program is when we are making a file system busybox It is provided by default , If your file system doesn't have this program , You can reconfigure busybox Or transplant it alone udhcpd This procedure , The specific migration steps will not be introduced here ）, The operation result is as shown in the figure 99.6.13 Shown ：

thus AP The hotspot feature has been turned on , We can input in the debug serial port “ps -el” View all processes , Be able to see hostapd and udkcpd Two processes are running in the background , Pictured 99.6.14 Shown ：

And then we can use a mobile phone or a laptop to scan wifi, Can find “Topeet_TEST” The Internet , And connect the wifi The Internet , Password input “123456780”, It will eventually connect to “Topeet_TEST” The Internet , At the same time, we will see when debugging the serial port dhcp Assigned to our cell phones ip Address “192.168.0.2”, Pictured 99.6.15 Shown ：

So far, we have finished the introduction of creating hot spots on the development board .