code: async def show_sessions(self):
          
          res = await self.call("wamp.session.list")
          for session_id in res:
              session = await self.call("wamp.session.get", session_id)
              self.log.info(session)
docs: Returns an object with a lists of the session IDs
          for all sessions currently attached to the realm
  
          http://crossbar.io/docs/Session-Metaevents-and-Procedures/