new_contents: """
  Copyright (c) 2015 SONATA-NFV
  ALL RIGHTS RESERVED.
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  
  Neither the name of the SONATA-NFV [, ANY ADDITIONAL AFFILIATION]
  nor the names of its contributors may be used to endorse or promote
  products derived from this software without specific prior written
  permission.
  
  This work has been performed in the framework of the SONATA project,
  funded by the European Commission under Grant number 671517 through
  the Horizon 2020 and 5G-PPP programmes. The authors would like to
  acknowledge the contributions of their colleagues of the SONATA
  partner consortium (www.sonata-nfv.eu).
  """
  """
  A simple topology with two PoPs for the y1 demo story board.
  
          (dc1) <<-->> s1 <<-->> (dc2)
  
  - SAP deployment enabled
  - learning switch enabled
  """
  
  import logging
  from mininet.log import setLogLevel
  from emuvim.dcemulator.net import DCNetwork
  from emuvim.api.rest.rest_api_endpoint import RestApiEndpoint
  from emuvim.api.sonata import SonataDummyGatekeeperEndpoint
  from mininet.node import RemoteController
  
  logging.basicConfig(level=logging.INFO)
  
  
  def create_topology1():
      # create topology
      net = DCNetwork(controller=RemoteController, monitor=True, enable_learning=True)
      dc1 = net.addDatacenter("dc1")
  
  
      # add the command line interface endpoint to each DC (REST API)
      rapi1 = RestApiEndpoint("0.0.0.0", 5001)
      rapi1.connectDCNetwork(net)
      rapi1.connectDatacenter(dc1)
      # run API endpoint server (in another thread, don't block)
      rapi1.start()
  
      # add the SONATA dummy gatekeeper to each DC
      sdkg1 = SonataDummyGatekeeperEndpoint("0.0.0.0", 5000, deploy_sap=True)
      sdkg1.connectDatacenter(dc1)
      # run the dummy gatekeeper (in another thread, don't block)
      sdkg1.start()
  
      # start the emulation platform
      net.start()
      net.CLI()
      net.stop()
  
  
  def main():
      setLogLevel('info')  # set Mininet loglevel
      create_topology1()
  
  
  if __name__ == '__main__':
      main()
  
subject: add simple topology example