#!/usr/bin/env python3

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# modification, are permitted provided that the following conditions are met:
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# 1. Redistributions of source code must retain the above copyright notice, this
# list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright notice,
# this list of conditions and the following disclaimer in the documentation
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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#         SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# DAMAGE.

import gi
gi.require_version('GUPnP', '1.2')

from gi.repository import GUPnP
from gi.repository import GLib
from gi.repository import GObject

RENDERING_CONTROL = "urn:schemas-upnp-org:service:RenderingControl:1"

def do_quit():
    global l

    l.quit()
    return False

def on_service_introspection(proxy, res):
    result = proxy.introspect_finish(res)
    action_info = result.get_action('GetVolume')
    state_variable_name = action_info.arguments[1].related_state_variable

    channel = result.get_state_variable(state_variable_name)
    print (f'Calling GetVolume for channel {channel.allowed_values[0]}')

    action = GUPnP.ServiceProxyAction.new_from_list('GetVolume', ["InstanceID", "Channel"], [0, channel.allowed_values[0]])
    proxy.call_action (action, None)
    success, [volume] = action.get_result_list (["CurrentVolume"], [GObject.TYPE_FLOAT])
    print(volume)

def on_sp_available(cp, proxy):
    print(f'Got ServiceProxy {proxy.get_id()} at {proxy.get_location()}')
    print('Introspecting service...')
    proxy.introspect_async(None, on_service_introspection)

if __name__ == '__main__':
    global l
    print("Looking for renderers and querying volumes fo 10s")

    l = GLib.MainLoop()
    context = GUPnP.Context.new ('wlp3s0', 0)
    cp = GUPnP.ControlPoint.new (context, RENDERING_CONTROL)
    cp.set_active (True)

    cp.connect ('service-proxy-available', on_sp_available)
    GLib.timeout_add_seconds (10, do_quit)
    l.run()

Add get-volume.py