User manual

Easy GPRS User Guide

80000ST10028 Rev. 1 - 14/03/07

2 Enhanced Easy GPRS Extension

2.1 Overview

The Easy GPRS feature allows the Telit module users to contact a device in internet and establish with

it a raw data flow over the GPRS and Internet networks.

This feature can be seen as a way to obtain a "virtual" serial connection between the Application

Software on the Internet machine involved and the controller of the Telit module, regardless of all the

software stacks underlying.

An example of the protocol stack involved in the devices is reported:

This particular implementation allows to the devices interfacing to the Telit module the use of the GPRS

and Internet packet service without the need to have an internal TCP/IP stack since this function is

embedded inside the module. The Easy GPRS overcomes some of the known limitations of the

previous implementation and implements some new features such as:

• Keep the GPRS context active even after the closing of a socket, allowing the application to keep

the same IP address;

• Also Mobile terminated (incoming) connections can be made, now it is possible to receive

incoming TCP connection requests;

• A new internal firewall has been implemented in order to guarantee a certain level of security on

internet applications.

Remote

Controlle

Device

Device (Internet)

Local Remote

pplication

TCP/UDP

EASY EASY TCP/UDP

GPRS GPRS

IP IP IP IP

Serial Data

Line on

Drive

Board

L2 L2

V.24 V.24

L1 L1

Teli

module networks

Firewall

<<<---------------------------------- Virtual Serial link ---------------------------------->>>

network interworking