Rainbow Electronics GM862-QUAD-PY User Manual
Page 19
Easy GPRS User Guide
80000ST10028 Rev. 4 - 16/07/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 19 of 63
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.
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 and EMAIL 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 the command #SKTD to open a socket connection and go online. When the
online activities are concluded we use +++ sequence to close the connection (see the figure below).
The green part represents the module command mode while the red part is the online mode.
Now, the online mode can be suspended with the escape sequence by using the multisocket feature.
During suspend mode the data received by the socket will be buffered. These data will be displayed
after socket resumption, as shown in the figure below:
This new feature allows users to switch between online mode and command mode without closing the
connection and eventually opening another socket (or resuming the suspended one), FTP or EMAIL
connection.
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