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See [this thread](https://forums.puri.sm/t/phone-call-api/8433) for context.
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### Getting/Setting Screen Brightness
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Introspect the GNOME Settings daemon to see what interfaces are available:
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```
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gdbus introspect --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power
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```
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The `org.gnome.SettingsDaemon.Power.Screen` interface is relevant:
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```
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interface org.gnome.SettingsDaemon.Power.Screen {
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methods:
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StepUp(out i new_percentage,
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out i output_id);
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StepDown(out i new_percentage,
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out i output_id);
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signals:
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properties:
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readwrite i Brightness = 29;
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};
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```
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Get all properties related to the screen:
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```
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gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.GetAll org.gnome.SettingsDaemon.Power.Screen
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```
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This should return something like the following:
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```
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({'Brightness': <29>},)
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```
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The brightness can be individually read:
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```
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gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Get org.gnome.SettingsDaemon.Power.Screen Brightness
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```
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It can also be set:
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```
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gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Set org.gnome.SettingsDaemon.Power.Screen Brightness '<30>'
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```
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## Using Applications to Provide Services
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GNOME applications run using the `--gapplication-service` command line option will expose the [org.freedesktop.Application](https://standards.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#dbus) interface on the session bus. This can be accessed to launch the application and request that it open files specified with URIs. The parameters of the API are explained by [this GApplication D-Bus APIs document](https://wiki.gnome.org/Projects/GLib/GApplication/DBusAPI) which refers to a different interface but which seems to overlap with the freedesktop interface.
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