docs: def disconnect(self):
          """
          Disconnect from a TWS or IB gateway application.
          This will clear all session state.
          """
          if not self.client.isConnected():
              return
          stats = self.client.connectionStats()
          self._logger.info(
              f'Disconnecting from {self.client.host}:{self.client.port}, '
              f'{util.formatSI(stats.numBytesSent)}B sent '
              f'in {stats.numMsgSent} messages, '
              f'{util.formatSI(stats.numBytesRecv)}B received '
              f'in {stats.numMsgRecv} messages, '
              f'session time {util.formatSI(stats.duration)}s.')
          self.client.disconnect()