wpa_cli、wpa_supplicant连接热点

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需要将rtl8821cs.ko、wpa_cli、wpa_supplicant等移植到板子上，wpa_supplicant包含两个主要的可执行工具：wpa_supplicant和wpa_cli。wpa_supplicant是核心程序，它和wpa_cli的关系就是服务和客户端的关系：后台运行wpa_supplicant，使用wpa_cli来搜索、设置、和连接网络。
在wpa_cli交互模式下可以执行很多命令，列表如下：

Full command	Short command	Description
status	stat	displays the current connection status
disconnect	disc	prevents wpa_supplicant from connecting to any access point
quit	q	exits wpa_cli
terminate	term	kills wpa_supplicant
reconfigure	recon	reloads wpa_supplicant with the configuration file supplied (-c parameter)
scan	scan	scans for available access points (only scans it, doesn‘t display anything)
scan_result	scan_r	displays the results of the last scan
list_networks	list_n	displays a list of configured networks and their status (active or not, enabled or disabled)
select_network	select_n	select a network among those defined to initiate a connection (ie select_network 0)
enable_network	enable_n	makes a configured network available for selection (ie enable_network 0)
disable_network	disable_n	makes a configured network unavailable for selection (ie disable_network 0)
remove_network	remove_n	removes a network and its configuration from the list (ie remove_network 0)
add_network	add_n	adds a new network to the list. Its id will be created automatically
set_network	set_n	shows a very short list of available options to configure a network when supplied with no parameters. See next section for a list of extremely useful parameters to be used with set_network and get_network.
get_network	get_n	displays the required parameter for the specified network. See nextsection for a list of parameters
save_config	save_c	saves the configuration

以下命令安装驱动，启动wpa_supplicant:

insmod /root/wifi/rtl8821cs.ko
wpa_supplicant -Dnl80211 -iwlan0 -cwpa.conf -B

执行 scan 扫描热点后，执行 scan_results 查看结果：
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记住 ssid 并根据热点密码设置连接信息，执行 add_network 添加网络获取添加的网络号，根据此号使用 set_network 热点名和密码，使用 select_network 选择即可，正常情况下就能连接到热点了。

状态变为 CTRL-EVENT-CONNECTED 就连接成功了：
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要使用wifi作为AP，让其他设备能连接到此设备，则还需要hostapd、dhcpd等。