docs: def master_call(self, **kwargs):
          '''
          Execute a wheel function through the master network interface (eauth).
          '''
          load = kwargs
          load['cmd'] = 'wheel'
          interface = self.opts['interface']
          if interface == '0.0.0.0':
              interface = '127.0.0.1'
          master_uri = 'tcp://{}:{}'.format(
              salt.utils.zeromq.ip_bracket(interface),
              six.text_type(self.opts['ret_port'])
          )
          channel = salt.transport.client.ReqChannel.factory(self.opts,
                                                             crypt='clear',
                                                             master_uri=master_uri,
                                                             usage='master_call')
          try:
              ret = channel.send(load)
          finally:
              channel.close()
          if isinstance(ret, collections.Mapping):
              if 'error' in ret:
                  salt.utils.error.raise_error(**ret['error'])
          return ret