Cannot get D-BUS working

[Pier Luigi Fiorini]

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Hi,
I played a bit with D-BUS in these days and I made a simple program that send 
a signal to the system bus (see the attachment).

With dbus-monitor --system "member='TestSignal'" or
dbus-monitor --system "type='signal',interface='org.test.simple'" or
dbus-monitor --system "sender='org.test.example'"
I don't see any message. :-/

What's wrong with my simple app?
-- 
BeFree lead developer
http://befree.berlios.de

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#include <stdio.h>
#include <stdlib.h>
#define DBUS_API_SUBJECT_TO_CHANGE
#include <dbus/dbus.h>

int
main (void)
{
	DBusError err;
	DBusConnection *conn;
	DBusMessage *mess;
	DBusMessageIter iter;

	dbus_error_init (&err);

	conn = dbus_bus_get (DBUS_BUS_SYSTEM, &err);
	if (!conn)
	{
		printf ("Couldn't connect to system bus: %s\n", err.message);
		dbus_error_free (&err);
		return 1;
	}

	dbus_bus_add_match (conn, "sender='org.test.example'", &err);
	if (dbus_error_is_set (&err))
	{
		printf ("Couldn't set match: %s\n", err.message);
		dbus_connection_disconnect (conn);
		dbus_error_free (&err);
		return 1;
	}

	mess = dbus_message_new_signal ("/org/test/simple", "org.test.simple", "TestSignal");
	if (!mess)
	{
		printf ("Couldn't create signal!\n");
		dbus_connection_disconnect (conn);
		dbus_error_free (&err);
		return 1;
	}

#if 0
	if (!dbus_message_set_sender (mess, "org.test.sender"))
	{
		printf ("Couldn't set sender!\n");
		dbus_connection_disconnect (conn);
		dbus_error_free (&err);
		return 1;
	}
#endif

	if (!dbus_message_set_member (mess, "TestSignal"))
	{
		printf ("Couldn't set member!\n");
		dbus_connection_disconnect (conn);
		dbus_error_free (&err);
		return 1;
	}

	dbus_message_iter_init (mess, &iter);
	if (!dbus_message_iter_append_int32 (&iter, 42))
	{
		printf ("Couldn't append int32!\n");
		dbus_connection_disconnect (conn);
		dbus_error_free (&err);
		return 1;
	}

	if (!dbus_connection_send (conn, mess, NULL))
	{
		printf ("Couldn't send!\n");
		dbus_connection_disconnect (conn);
		dbus_error_free (&err);
		return 1;
	}
	dbus_connection_flush (conn);

	return 0;
}

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