new_contents: from devicehive import Handler
  from devicehive import DeviceHive
  
  
  class EchoHandler(Handler):
  
      def handle_connect(self):
          info = self.api.get_info()
          print(info)
          self.api.disconnect()
  
  
  url = 'http://playground.dev.devicehive.com/api/rest'
  refresh_token = 'PUT_YOUR_REFRESH_TOKEN_HERE'
  dh = DeviceHive(EchoHandler)
  dh.connect(url, refresh_token=refresh_token)
  
subject: Add examples/echo.py