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 readwrite 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.

		boolean Online [readwrite]

			Boolean representing the rf state of the modem.
			Online is false in flight mode.

		boolean Lockdown [readwrite]

			Boolean representing the lock state of the modem.
			Setting it to true, makes the calling application hold
			the modem lock and power it down. Setting to false
			makes the it release the modem lock. Only the
			application that holds the lock can power up the modem.
			If the the application exits Lockdown is set to false.

		boolean Emergency [readonly, optional, experimental]

			Boolean representing the emergency mode of the
			modem. The Emergency is true if an emergency call or
			related operation is currently active.

		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} Features [readonly]

			List of currently enabled features. It uses simple
			string abbreviations like "sms", "sim" etc.

		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?