code: def start(self):
          
          if self.started:
              raise ConnectorStartedError()
  
          self.started = True
  
          try:
              self.connect_watcher.start()
              self.timeout_watcher.start()
              self.sock.connect(self.addr)
          except IOError as e:
              self.errored = True
              self._finish()
              self.deferred.errback(e)
  
          return self.deferred
docs: Start the connector state machine.