[dbus]How to verify the capability of dbus IPC between machines

[yinxb]

Add os and dbus version
Local PC:ubuntu 10.04 D-Bus Daemon version 1.2.6
Remote PC:ubuntu 11.04 D-Bus Daemon version 1.4.6

在 2011年11月29日 下午12:58，yinxb <yinxiaobiao at gmail.com> 写道：
> In addition,dbus-monitor in the remote PC cannot find any info related
> the dbus-send.
>
> 在 2011年11月29日 上午10:38，yinxb <yinxiaobiao at gmail.com> 写道：
>> Hi  Thiago Macieira and Pavel
>>
>>     Thanks for your reply.
>>
>>     As metioned in your mail,I did the following steps:
>> 1.Romote PC:
>>   Config /etc/dbus-1/system.conf.
>>   Add listen tcp:host=0.0.0.0,port=12434
>>
>> 2.Local PC:
>>   dbus-send --address=tcp:host=xx.xxx.xx.116,port=12434 --print-reply
>>  --dest=org.gnome.PowerManager
>> /org/ayatana/NotificationItem/gnome_power_manager/Menu
>> org.freedesktop.Dbus.Introspectable.Introspect
>>
>> after that,I got the following message:
>> Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply.
>> Possible causes include: the remote application did not send a reply,
>> the message bus security policy blocked the reply, the reply timeout
>> expired, or the network connection was broken.
>>
>> Can you figure out what is missing or wrong with my steps?
>>
>> ps:
>> telnet can connect the remote PC (xx.xxx.xx.116).
>>
>> 2011/11/29 Thiago Macieira <thiago at kde.org>:
>>> On Monday, 28 de November de 2011 15.59.42, 尹YinXiaobiao wrote:
>>>> Hi all
>>>>      I am a newbie at Dbus and this is my first mail in this maillist.
>>>>     By some investigate and look at the source code,I know that dbus
>>>> is using socket(tcp & unix domain socket) to transfer data.
>>>>     So it is possible for communication between two machines(or VM).
>>>
>>> Right, it's possible.
>>>
>>>>     Now my question is how to vevify this capability by dbus-send command.
>>>>     Can anyone give me  a hint?
>>>
>>> Just send the message you want to send. You know the address of the bus server
>>> to connect to, so pass it in the --address= option. You know that address
>>> because you configured the other machine with it.
>>>
>>>> Someone tell me that dbus do not listen on TCP by default,how to
>>>> enable TCP listen?
>>>
>>> Create your own config file and change the <listen> directive to be on TCP.
>>>
>>> Remember: D-Bus TCP is unauthenticated an unencrypted. It accepts connections
>>> from anywhere and trusts it blindly.
>>>
>>> --
>>> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>>>   Software Architect - Intel Open Source Technology Center
>>>      PGP/GPG: 0x6EF45358; fingerprint:
>>>      E067 918B B660 DBD1 105C  966C 33F5 F005 6EF4 5358
>>>
>>> _______________________________________________
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>>> dbus at lists.freedesktop.org
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>>>
>>>
>>