No data recieved from subscribeSignal method.

[yash1200]

With the help of example/signal.dart, I was able to write this function but still no value is being recieved from it.

var client = DBusClient.system();
var object = DBusRemoteObject(
  client,
  'org.freedesktop.UPower',
  DBusObjectPath('/org/freedesktop/UPower/devices/DisplayDevice'),
);
var stream = object.subscribeSignal('org.freedesktop.UPower.Device', 'State');
await for (var signal in stream) {
  var state = (signal.values[0] as DBusUint64).value;
  print('State is : $state!');
}

[robert-ancell]

Looking at the UPower D-Bus interface using D-Feet shows it doesn't have a State signal, but instead a State property. The documentation confirm this.

With the following code I can monitor state changes as I connect and disconnect the power on my laptop. Hope this helps!

var client = DBusClient.system();
var object = DBusRemoteObject(client, 'org.freedesktop.UPower', DBusObjectPath('/org/freedesktop/UPower/devices/DisplayDevice'));

var state = await object.getProperty('org.freedesktop.UPower.Device', 'State');
print ('state: ${state}');
var stream = object.subscribePropertiesChanged();
await for (var signal in stream) {
  var state = signal.changedProperties['State'];
  if (state != null) {
    print ('state: ${state}');
  }
}

[robert-ancell]

This might help! https://pub.dev/packages/upower

[yash1200]

That's great. Thank you for this plugin. I made a PR with the help of your code here . Thank you for your help :).

[robert-ancell]

@yash1200 see canonical/upower.dart#3 for monitoring the state (see example/monitor-state.dart).

[yash1200]

That's great. Till when can we expect the stable release of these plugins ?

[robert-ancell]

That's great. Till when can we expect the stable release of these plugins ?

I don't have a schedule for a stable release, but I'm looking at:

• If I'm happy with the API and I feel it's complete (I think we're very close to that).
• If the feedback from other developers (like you, thanks!) suggests there's not issues with the current API.