Rainbow Electronics GC864-PY - Manual (Page 27)

Telit GE864 and GC864 Product Description
80273ST10008a Rev. 14 - 18/09/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 27 of 62
• 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.
4.1.2 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 status 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.