text: ###############################################################################
  #
  # The MIT License (MIT)
  #
  # Copyright (c) Tavendo GmbH
  #
  # Permission is hereby granted, free of charge, to any person obtaining a copy
  # of this software and associated documentation files (the "Software"), to deal
  # in the Software without restriction, including without limitation the rights
  # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  # copies of the Software, and to permit persons to whom the Software is
  # furnished to do so, subject to the following conditions:
  #
  # The above copyright notice and this permission notice shall be included in
  # all copies or substantial portions of the Software.
  #
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  # THE SOFTWARE.
  #
  ###############################################################################
  
  from __future__ import print_function
  
  try:
      import asyncio
  except ImportError:
      # Trollius >= 0.3 was renamed
      import trollius as asyncio
  
  from os import environ
  from autobahn.asyncio.wamp import ApplicationSession, ApplicationRunner
  import ssl
  
  
  class Component(ApplicationSession):
      """
      An application component that publishes an event every second.
      """
  
      @asyncio.coroutine
      def onJoin(self, details):
          counter = 0
          while True:
              print("publish: com.myapp.topic1", counter)
              self.publish(u'com.myapp.topic1', counter)
              counter += 1
              yield from asyncio.sleep(1)
  
  
  if __name__ == '__main__':
      # see README; this way everything accesses same cert-files
      cert_path = '../../../../twisted/wamp/pubsub/tls/server.crt'
      print(cert_path)
      # create an ssl.Context using just our self-signed cert as the CA certificates
      options = ssl.create_default_context(cadata=open(cert_path, 'r').read())
      # ...which we pass as "ssl=" to ApplicationRunner (passed to loop.create_connection)
      runner = ApplicationRunner(
          environ.get("AUTOBAHN_DEMO_ROUTER", u"wss://127.0.0.1:8083/ws"),
          u"crossbardemo",
          ssl=options,  # try removing this, but still use self-signed cert
      )
      runner.run(Component)
  