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import gobjectimport loggingfrom gi.repository import TelepathyGLib as Tplogging.basicConfig(level=logging.DEBUG)def message_received_cb(channel, message):    logging.debug("Message received")    print messagedef message_sent_cb(channel, message):    logging.debug("Message sent")    print messagedef observe_channels(observer, account, connection, channels, dispatch_op, requests, context, user_data):    logging.debug("channels observed")    for channel in channels:        props = channel.borrow_immutable_properties()        #these signals never trigger. why?        channel.connect('message-received', message_received_cb)        channel.connect('message-sent', message_sent_cb)        logging.debug("connected to signals")        messages = channel.get_pending_messages()        for m in messages:            print m    context.accept()dbus = Tp.DBusDaemon.dup()observer = Tp.SimpleObserver.new(dbus, True, 'Test', True, observe_channels, None)# We want to observe text chatsobserver.add_observer_filter({    'org.freedesktop.Telepathy.Channel.ChannelType': 'org.freedesktop.Telepathy.Channel.Type.Text'    })observer.register()main_loop = gobject.MainLoop()main_loop.run()