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This article mainly introduces "how to configure AP hotspots on the development board in Android". In daily operation, I believe many people have doubts about how to configure AP hotspots on the development board in Android. The editor consulted all kinds of materials and sorted out simple and easy-to-use methods of operation. I hope it will be helpful to answer the questions of "how to configure AP hotspots on the development board in Android". Next, please follow the editor to study!

The development board connects the power supply and the debug serial port, then opens the debug serial port terminal, then powers on the development board and waits for the system to start up, as shown in figure 99.6.1:

Then insert the U disk made in Chapter 5 into the USB interface of the development board, and you can see that the serial port prints out the information of the USB device, as shown in figure 99.6.2:

When we enter the "df" command in the debug serial port terminal, we can see the mount directory of the U disk. The running result is shown in figure 99.6.3:

Next, we enter the "cd / run/media/sda1/hostap" command on the debug serial terminal and enter the "hostap" folder we created in Chapter 5, as shown in figure 99.6.4:

When we enter the "ls" command, we can see the file copied in Chapter 5, as shown in figure 99.6.5:

Then we use the cp command to copy "lib_nl.tar.gz" and "openssl.tar.gz" to the "/ usr/lib" directory of the system directory, and the result is shown in figure 99.6.6:

Then we use the "cd / usr/lib" command to go to the "/ usr/lib" directory, as shown in figure 99.6.7:

Then enter the "tar-xvf lib_nl.tar.gz" and "tar-xvf openssl.tar.gz" commands to extract the libnl and openssll library files to the current directory (as I am using the yocto file system here, the libnl and openssll library files have been installed in the system, so I will not extract them, if you use other file systems, you need to extract them here).

Then go back to the directory of the USB disk and copy "hostapd.conf", "udhcpd.conf" and "udhcpd.leases" to the system's "/ etc" directory, as shown in figure 99.6.8:

The hostapd.conf file is the network name and password that sets the AP hotspot, and its contents are 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

The above ssid is the name of the wifi (Topeet_test), and wpa_passphrase is the password of the wifi (1234567890).

The udhcpd.conf file configures dhcp and contains the following:

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 specify the IP address range assigned by wifi (192.168.0.2-192.168.0.100). You can check the other parameters online, so we won't elaborate on them here.

Then copy "hostapd" to the system's "/ usr/sbin" directory, as shown in figure 99.6.9:

Since the yocto file system uses the rfkill command to manage wifi and Bluetooth, we first enter "rfkill unblock wifi" in the debug serial port terminal to open wifi (if you are not using a yocto file system, you can ignore the next step). The running result is shown in figure 99.6.10:

Then enter the "ifconfig wlan0 192.168.0.1 up" command on the debug serial port, configure ip for wlan0, and enable wlan, as shown in figure 99.6.11:

Then enter "hostapd-B / etc/hostapd.conf-dd" in the debug serial port to start the AP hotspot, and the running result is shown in figure 99.6.12:

Then enter "udhcpd-fS / etc/udhcpd.conf &" in the debug serial port to enable the dhcp server service (udhcpd is provided by default in busybox when we create the file system. If you do not have this program in your file system, you can reconfigure busybox or migrate the udhcpd program separately. The specific migration steps are not described here). The running result is shown in figure 99.6.13:

At this point, the AP hotspot function has been enabled. We can enter "ps-el" in the debug serial port to view all processes. We can see the hostapd and udkcpd processes running in the background, as shown in figure 99.6.14:

Then we can scan the wifi using our mobile phone or notebook. We can find the "Topeet_TEST" network, connect to the wifi network, enter the password "123456780", and finally connect to the "Topeet_TEST" network. At the same time, when we debug the serial port, we will see the ip address "192.168.0.2" assigned to our mobile phone by dhcp, as shown in figure 99.6.15:

At this point, the study on "how to configure AP hotspots on the development board in Android" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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