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8. CORBA AND NOKIA 30
The CORBA (Common Object Request Broker Architecture) is a widely distributed
computing infrastructure, standardised by the Object Management Group (OMG) consortium.
In short, CORBA applications are composed of objects which can be located within different
machines. Objects have services and they are utilised with request messages. The CORBA
hides the underlying transferring network, such as the Internet or GSM network as well as
the underlying protocols, so that a user can use functions as local procedure calls.
Object services are described with an abstract language named IDL (Interface Definition
Language). The IDL also provides the necessary information required to develop clients that
use an object's interface operations. The interface definition specifies which member
functions, data types, attributes and exceptions are available to a client, without making any
assumptions about an object’s implementation. An IDL compiler is responsible for mapping
IDL interfaces onto the particular programming language, such as C, C++ or Java. Thus, the
programming language that is used in CORBA implementation does not have to be object-
oriented.
Example applications implemented using CORBA IDL can be found at the Forum Nokia web
pages; http://www.forum.nokia.com.
8.1 THE NOKIA 30 GSM CONNECTIVITY TERMINAL IDLS
The Nokia 30 offers services through three IDLs: wirelessDevice, Nokia GSM connectivity
terminal and Remote IO Control. The wirelessDevice IDL is common for all kinds of devices.
Terminal-specific services are described in the Nokia GSM Connectivity Terminal IDL and
features related to remote input/output control in the Remote IO Control IDL.
The services offered by WirelessDevice IDL are divided into four groups: Device,
ParamObserver, EventObserver and IOControlObserver. The Device group has functions to
handle dynamic parameters and counters. It also has functions to manage event and
parameter observation. The EventObserver services are used to provide information
regarding unusual events like incoming calls or network connection loss. ParamObserver
functions are used in the same way, but in their case, are used to receive notification of
changes in dynamic parameters. The IOControlObserver is used to indicate changes in the
general-purpose input and output pins.
The Nokia GSM connectivity terminal IDL provides GSM-related operations, such as call
control, SMS, USSD, supplementary service and light indicator control functions. They
provide easy access to basically all mobile network services.
Remote IO Control IDL has functions for the remote control of input/output pins residing in
the M2M System Connector.
All dynamic parameters and counters in the Nokia GSM connectivity terminal are described
with XML (Extensible Markup Language) so they are easily available in a simple and
universal format.