code: def subscribe(self,topic,callback=None,options=None):
          
          full_topic = self.get_full_uri(topic)
          result = self.send_and_await_response(SUBSCRIBE(
                                      options=options or {},
                                      topic=full_topic
                                  ))
          if result == WAMP_SUBSCRIBED:
              if not callback:
                  callback = lambda a: None
              self._subscriptions[result.subscription_id] = [topic,callback]
docs: Subscribe to a uri for events from a publisher