Rainbow Electronics GT863-PY - Manual (Page 25)

GT863-PY Terminal Product Description
80269ST10026a Rev. 0 - 27/09/06
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Right reserved
page 25 of 50
3 Software Features
3.1 Enhanced EASY GPRS Extension
3.1.1 Overview
The EASY GPRS feature allows a user of the
Telit GT863-PY to contact a device in the 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 GT863-PY , 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 GT863-PY 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 new
Enhanced version of 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
Controller Device
Device (Internet)
Local Remote
Application Application
TCP/UDP
EASY EASY TCP/UDP
GPRS GPRS
IP IP IP IP
Serial Data
Line on
Driver Board
L2 L2
V.24 V.24
L1 L1
Telit
GT863-PY networks
Firewall
<<<---------------------------------- Virtual Serial link ---------------------------------->>>
network interworking