dbus send system message to system bus

[Tomas Pelka]

Could anybody advise me how to send a message (system or call method) 
through system bus?

$ dbus-send --system --print-reply --dest=org.freedesktop.NetworkManager 
--type=signal /org/freedesktop/NetworkManager 
org.freedesktop.NetworkManager.StateChange  uint32:1

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.

This seem like it works, but dbus-monitor said:

signal sender=org.freedesktop.DBus -> dest=(null destination) 
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; 
member=NameOwnerChanged
    string ":1.49"
    string ""
    string ":1.49"
signal sender=org.freedesktop.DBus -> dest=(null destination) 
path=/org/freedesktop/DBus; interface=org.freedesktop.DBus; 
member=NameOwnerChanged
    string ":1.49"
    string ":1.49"

How can I send message including data. System bus is protected via dbus 
policy isn't it? How can I convince about it?

Thanks for help

-- 

Tom

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* Tomas Pelka			 tompelka at gmail.com
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