Modem hierarchy
===============

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

Methods		dict GetProperties()

			Returns properties for the modem object. See
			the properties section for available properties.

			Possible Errors: [service].Error.InvalidArguments

		void SetProperty(string property, variant value)

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

			Possible Errors: [service].Error.InvalidArguments
					 [service].Error.DoesNotExist

Signals		PropertyChanged(string name, variant value)

			This signal indicates a changed value of the given
			property.

Properties	boolean Powered [readwrite]

			Boolean representing the power state of the modem
			device.

		string Name [readonly, optional]

			Friendly name of the modem device.

		string Manufacturer [readonly, optional]

			String representing the manufacturer of the modem
			device.

			This is usually obtained by the +CGMI AT command.

		string Model [readonly, optional]

			String representing the model of the modem device.

			This is usually obtained by the +CGMM AT command.

		string Revision [readonly, optional]

			String representing the revision of the modem device.

			This is usually obtained by using the +CGMR AT command.

		string Serial [readonly, optional]

			String represeting the serial number of the modem
			device.

			This is usually obtained by using the +CGSN AT command.

		array{string} Interfaces [readonly]

			Set of interfaces currently supported by the mode
			device. The set depends on the state of the device
			(registration status, SIM inserted status,
			network capabilities, device capabilities, etc.)

			TODO: Better to split this into Status and
			      Capabilites properties?