wpa_supplicant的用法

（1）通过adb命令行，可以直接打开supplicant，从而运行wpa_cli，可以解决客户没有显示屏而无法操作WIFI的问题，还可以避免UI的问题带到driver。进一步来说，可以用在很多没有键盘输入和LCD输出的安卓终端产品的操作上。

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。

（2）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

exits wpa_cli

terminate

term

kills wpa_supplicant

reconfigure

recon

reloads wpa_supplicant with the configuration file supplied (-c parameter)

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 next section for a list of parameters

save_config

save_c

saves the configuration

（3）平台操作实例（仅限于MTK平台且具ROOT权限）

A，首先保证ADB连入，且能运行adb remount，这样避免系统文件只读。然后设置wpa_cli和wpa_supplicant有较强权限。

B，运行echo 1 > /dev/wmtWifi，启动WIFI驱动。但是这个使能不会表现在安卓界面上层，默认是要在启动安卓时开启WIFI模块的，也即设置中的WIFI要默认ON。

C，进入/system/bin目录，首先运行服务端wpa_supplicant。

./wpa_supplicant -iwlan0 -Dnl80211 -c/system/etc/wifi/wpa_supplicant.conf

正常启动后的回显如下：

不可收入态表明该服务端已经在运行了（也可能是可输入状态，只要后面的wpa_cali可连接就行）。-i -D -c的参数意义可直接在Help中查询，具体有些参数可能因平台不同而有差异。

D，另开启一个ADB SHELL，作客户端运行wpa_cali。如下：

cd /system/bin

wpa_cli -p /data/misc/wpa_supplicant

回显如下说明正常并处于交互模式：

E，执行一系列命令看看

scan

scan_results

F，连WIFI的命令行，有以下几种：

for AP that doesn`t have encryption

>add_network (It will display a network id for you, assume it returns 0)

>set_network 0 ssid “666”

>set_network 0 key_mgmt NONE

>enable_network 0

>quit

for AP that has WEP

>add_network (assume returns 1)

>set_network 1 ssid “666”

>set_network 1 key_mgmt NONE

>set_network 1 wep_key0 “your ap passwork”(if usting ASCII, it need

double quotation marks, if using hex, then don`t need the double quotation

marks)

>set_network 1 wep_tx_keyidx 0

>select_network 1 (optional, remember, if you are connecting with another

AP, you should select it to disable the another)

>enable_network 1

for AP that has WPA-PSK/WPA2-PSK

>add_network (assume returns 2)

>set_network 2 ssid “666”

>set_network 2 psk “your pre-shared key”

>select_network 2 (optional, remember, if you are connecting with another

AP, you should select it to disable the another)

>enable_network 2

我自己的实验图如下：

以上过程就说明联网OK，可以上网了。

参考原文：http://cache.baiducontent.com/c?m=9f65cb4a8c8507ed4fece7631046893b4c4380146d96864968d4e414c42246100024b8ed7a66471980853a3c50f11e41bca770216c5d61aa9bc98b4addb9922b3bcd7a742613d51742c419de8a1c729f7e875a98ea42b3e1&p=8b2a975bcd8711a052eedb2f4a4c&newp=8b2a971f81822dec08e29e7d495d92695c02dc3051dcd14f2895ff0b&user=baidu&fm=sc&query=adb+shell+wifi&qid=&p1=4

参考原文：http://blog.sina.com.cn/s/blog_55465b470100l73l.html

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