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This is probably the most simple D-Bus program you could conceive
To test, run `DBUSXX_VERBOSE=1 ./echo-server` and try the following commands:
dbus-send --dest=org.freedesktop.DBus.Examples.Echo --type=method_call --print-reply /org/freedesktop/DBus/Examples/Echo org.freedesktop.DBus.EchoDemo.Random
dbus-send --dest=org.freedesktop.DBus.Examples.Echo --type=method_call --print-reply /org/freedesktop/DBus/Examples/Echo org.freedesktop.DBus.EchoDemo.Hello string:"world"
dbus-send --dest=org.freedesktop.DBus.Examples.Echo --type=method_call --print-reply /org/freedesktop/DBus/Examples/Echo org.freedesktop.DBus.EchoDemo.Sum array:int32:10,100,250
dbus-send --dest=org.freedesktop.DBus.Examples.Echo --type=method_call --print-reply /org/freedesktop/DBus/Examples/Echo org.freedesktop.DBus.EchoDemo.Info
or, using python instead
$ python
import dbus
bus = dbus.SessionBus()
object = bus.get_object('org.freedesktop.DBus.Examples.Echo','/org/freedesktop/DBus/Examples/Echo')
echo = dbus.Interface(object, dbus_interface='org.freedesktop.DBus.EchoDemo')
echo.Random()
echo.Hello("world")
echo.Sum([123, 234, 95, 520])
echo.Info()
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