new_contents: #!/usr/bin/env python3
  #
  # Copyright (c) 2019, Jens Georg <mail@jensge.org>
  #
  # All rights reserved.
  #
  # Redistribution and use in source and binary forms, with or without
  # modification, are permitted provided that the following conditions are met:
  #
  # 1. Redistributions of source code must retain the above copyright notice, this
  # list of conditions and the following disclaimer.
  #
  # 2. Redistributions in binary form must reproduce the above copyright notice,
  # this list of conditions and the following disclaimer in the documentation
  # and/or other materials provided with the distribution.
  #
  # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  # AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  # IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  # DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
  # FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  # DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
  #         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  # HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  # LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  # OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  # DAMAGE.
  
  import gi
  gi.require_version('GSSDP', '1.2')
  from gi.repository import GSSDP
  from gi.repository import GLib
  import time
  
  c = GSSDP.Client (uda_version = GSSDP.UDAVersion.VERSION_1_1, boot_id = time.time(), config_id = 1)
  c.init()
  g = GSSDP.ResourceGroup(client = c)
  
  def on_update():
      new_boot_id = c.props.boot_id + 1;
      print('Updating boot_id from {} to {}'.format(c.props.boot_id, new_boot_id))
      g.update (c.props.boot_id + 1)
      return True
  
  if __name__ == '__main__':
      g.add_resource_simple ('upnp:rootdevice', 'a66a9a18-3f31-4d41-ad64-98443e4d4399::upnp:rootdevice', 'http://127.0.0.1')
      g.set_available(True)
  
      l = GLib.MainLoop()
      GLib.timeout_add_seconds(5, on_update)
      l.run()
  
subject: Add simple python example