Cell broadcast hierarchy
========================

Service		org.ofono
Interface	org.ofono.CellBroadcast
Object path	[variable prefix]/{modem0,modem1,...}

Methods		dict GetProperties()

			Returns properties for the cell broadcast object. See
			the properties section for available properties.

		void SetProperty(string property, variant value)

			Changes the value of the specified property. Only
			properties that are listed as readwrite are
			changeable. On success a PropertyChanged signal
			will be emitted.

			Possible Errors: [service].Error.InProgress
					 [service].Error.InvalidArguments
					 [service].Error.Failed

Signals		PropertyChanged(string name, variant value)

			This signal indicates a changed value of the given
			property.

		IncomingBroadcast(string text, uint16 topic)

			This signal is emitted whenever a new cell broadcast
			is received.  The string text contains contents of the
			broadcast and topic contains the channel this
			broadcast was received on.

			Please note that base station name broadcasts are
			handled by the NetworkRegistration interface.

		EmergencyBroadcast(string text, dict properties)

			This signal is emitted whenever an ETWS cell broadcast
			is received.  The string text contains contents of the
			broadcast.  The dict is made up of the following
			entries:
				EmergencyType - string value, possible values
						include: "Earthquake",
							"Tsunami",
							"Earthquake+Tsunami",
							"Other"
				EmergencyAlert - boolean value hinting whether
						an extra emergency indicator
						should be activated (e.g.
						vibrate mode, emergency alert
						mode.)

				Popup - boolean value hinting whether the UI
					should popup a message box with the
					emergency information.

Properties	boolean Powered [readwrite]

			Boolean representing the power state of the cell
			broadcast service.  If powered is False, then no
			Cell Broadcast information is received.

		string Topics [readwrite]

			Returns a list of topics currently subscribed to by
			this modem.  If the list is empty, then only emergency
			broadcasts will ever be received.