code: def run(self):
          
          if self.json_output:
              output_to_pipe(self._pipe_in)  # Disable stdout
              error = self.lib.iperf_run_client(self._test)
  
              if not self.iperf_version.startswith('iperf 3.1'):
                  data = read_pipe(self._pipe_out)
                  if data.startswith('Control connection'):
                      data = '{' + data.split('{', 1)[1]
              else:
                  data = c_char_p(
                      self.lib.iperf_get_test_json_output_string(self._test)
                  ).value
                  if data:
                      data = data.decode('utf-8')
  
              output_to_screen(self._stdout_fd, self._stderr_fd)  # enable stdout
  
              if not data or error:
                  data = '{"error": "%s"}' % self._error_to_string(self._errno)
  
              return TestResult(data)
docs: Run the current test client.
  
          :rtype: instance of :class:`TestResult`