从python访问iwd dbus接口

Question

我正在尝试使用 python3 dbus 包来控制嵌入式 Linux 目标（mips MT7628，如果重要的话）上的无线。

系统很可能设置正确，因为我在这个嵌入式目标上启动并运行了 iwd + dhclient。

我可以通过 eth0 和 wlan0 进行连接。

我也可以通过 iwctl 控制 iwd。到目前为止一切顺利。

我现在需要从 python3 控制 iwd；具体来说，我需要能够通过串行线发送扫描结果（真正的目标，而不是我的开发板，将是无头的）。

我对 dbus 接口不知所措。我需要一些例子来开始。

我尝试了一些类似的东西：

# 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
>>> 

这是在 WiFi 工作时：

# 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。

有人能指点我正确的方向吗？

Answer 1

回答我自己的问题以帮助任何会在这里绊倒的人：

事实证明，iwd 和 connman 存储库都在子目录“test”中提供了完整的 python3 示例。

使这些适应我的特定需求被证明是微不足道的。

相关目录可以在here (iwd)和here (connman)找到。

我的具体问题的解决方案是以下脚本：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()

list_known_networks：

#!/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))