从python访问iwd dbus接口

Question

我正在尝试使用python3dbus包在嵌入式Linux目标（mips MT7628，如果有必要的话）上控制无线

系统很可能设置正确，因为我已经在这个嵌入式目标上安装并运行了iwd+dhclient

我可以通过eth0和wlan0进行连接

我还可以通过iwctl控制iwd。到目前为止还不错

我现在需要从python3控制iwd；具体地说，我需要能够通过串行线发送扫描结果（与我的开发板相反，RealTarget将是无头的）

我无法使用dbus接口。首先我需要一些例子

我尝试了一些类似的方法：

# python
Python 3.8.1 (default, Feb 21 2020, 11:13:38) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import dbus
>>> bus = dbus.SystemBus()
>>> wlan0 = bus.get_object('net.connman.iwd', '/net/connman/iwd/phy1/1')
>>> p = wlan0.Properties(dbus_interface='net.connman.iwd.Station')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/site-packages/dbus/proxies.py", line 72, in __call__
  File "/usr/lib/python3.8/site-packages/dbus/proxies.py", line 141, in __call__
  File "/usr/lib/python3.8/site-packages/dbus/connection.py", line 652, in call_blocking
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NotFound: No matching method found
>>> p = wlan0.Scan(dbus_interface='net.connman.iwd.Station')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.8/site-packages/dbus/proxies.py", line 141, in __call__
  File "/usr/lib/python3.8/site-packages/dbus/connection.py", line 652, in call_blocking
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NotFound: No matching method found
>>> 

当WiFi工作时，请执行以下操作：

# iwctl 
[iwd]# adapter list
                                    Adapters                                  *
--------------------------------------------------------------------------------
  Name               Powered   Vendor              Model               
--------------------------------------------------------------------------------
  phy1               on        --

[iwd]# device list
                                    Devices                                   *
--------------------------------------------------------------------------------
  Name                Address             Powered   Adapter   Mode      
--------------------------------------------------------------------------------
  wlan1               42:c1:f8:85:67:ba   on        phy1      station   

[iwd]# station list
                            Devices in Station Mode                           *
--------------------------------------------------------------------------------
  Name                State          Scanning
--------------------------------------------------------------------------------
  wlan1               connected              

[iwd]# 

。。。但我显然遗漏了一些非常基本的东西

有人能给我指一下正确的方向吗

Answer 1

回答我自己的问题，帮助那些在这里绊倒的人：

事实证明，iwd和connman存储库在子目录“test”中都有完整的python3示例

事实证明，根据我的具体需要调整这些内容是微不足道的

相关目录可在here (iwd)和here (connman)找到

我的具体问题的解决方案如下：scan-for-networks和list-known-networks

扫描网络：

#!/usr/bin/python3

import sys
import dbus


if (len(sys.argv) != 2):
    print("Usage: %s <device>" % (sys.argv[0]))
    sys.exit(1)

bus = dbus.SystemBus()
device = dbus.Interface(bus.get_object("net.connman.iwd", sys.argv[1]),
                                    "net.connman.iwd.Station")
device.Scan()

列出已知网络：

#!/usr/bin/python3

import sys
import dbus

bus = dbus.SystemBus()

manager = dbus.Interface(bus.get_object('net.connman.iwd', '/'),
                         'org.freedesktop.DBus.ObjectManager')

forget = None
if len(sys.argv) >= 4 and sys.argv[1] == 'forget':
    forget = (sys.argv[2], sys.argv[3])

print('Known Networks:')

for path, interfaces in manager.GetManagedObjects().items():
    if 'net.connman.iwd.KnownNetwork' not in interfaces:
        continue

    network = interfaces['net.connman.iwd.KnownNetwork']

    if (network['Name'], network['Type']) == forget:
        obj = dbus.Interface(bus.get_object('net.connman.iwd', path),
                             'net.connman.iwd.KnownNetwork')
        obj.Forget()
        continue

    print("[ %s ]" % network['Name'])

    for key in network:
        val = network[key]
        if type(val) == dbus.Boolean:
            val = 'True' if val else 'False'
        print("    %s = %s" % (key, val))