User Manual

GE863-PRO

Product Description

80285ST10036a Rev. 1 DRAFT- 24/04/08

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

internet applications.

3.31.1.2 Easy GPRS definition

The Easy GPRS feature provides a way to replace the need of an Internet TCP/IP stack at the

terminal equipment side. The steps that will be required to obtain a virtual serial connection (that is

actually a socket) to the Internet peer are:

• Configuring the GPRS Access

• Configuring the embedded TCP/IP stack behavior

• Defining the Internet Peer to be contacted

• Request the GPRS and socket connections to be opened (host is connected)

• Exchange raw data

• Close the socket and GPRS context

All these steps are achieved through AT commands.

As for common modem interface, two logical statuses are involved: command mode and data traffic

mode:

• In Command Mode (CM), some AT commands are provided to configure the Data Module

Internet stack and to start up the data traffic.

• In data traffic mode (Socket Mode, SKTM), the client can send/receive a raw data stream

which will be encapsulated in the previously configured TCP / IP packets which will be sent to

the other side of the network and vice versa. Control plane of ongoing socket connection is

deployed internally to the module.

For more detailed information regarding GPRS please consult Easy GPRS User Guide and AT

Commands Reference Guide.

3.31.2 Multisocket

New functionality of the Telit modules, multisocket is an extension of Telit Easy GPRS feature, which

allows the user to have two contexts activated (that means two different IP address), more than one

socket connection (with a maximum of 6) and simultaneous FTP client service.

The basic idea of multisocket is the possibility of suspend a socket connection with the escape

sequence +++.

With IP Easy we can use a SKTD to open a socket connection and go online. After online activities we

use +++ sequence to close the connection (see the figure below).