Telit GE864 and GC864
Product Description
80273ST10008A Rev. 3 - 10/02/06
Reproduction forbidden without DAI Telecom written authorization – All Right reserved – Right of modification reserved
page 47 of 72
DNS to obtain the IP address relative to the host nick name provided. This process of context
activation and DNS query may require a bit more time and requires that the GPRS network
coverage is good enough to permit data transfers.
5.1.2.4 Open the connection with the internet host
With the AT#SKTOP all the process required to connect with the internet host starts:
- GE864 / GC864 activates the first context
- GE864 / GC864 proceeds to the authentication with the parameters specified
- Eventually does the DNS query to resolve the IP address of the host name internet peer
- GE864 / GC864 establishes a TCP/UDP (depending on the parameter request) connection
with the given internet host
- Once the connection is up the module reports the code: CONNECT
From this moment the data incoming in the serial port is packet and sent to the Internet host, while
the data received from the host is buffered and flushed to the Terminal Equipment.
5.1.2.5 Close the Socket and deactivate the context
The connection can be closed because of:
- remote host TCP connection close
- socket
inactivity
timeout
- Terminal Equipment by issuing the escape sequence "+++"
- Network
deactivation
Note: if in the raw data to be sent there's an escape sequence, then the TE must work it out and
sent it in a different fashion to guarantee that the connection is not closed.
The pause time is defined in the parameter S12.
On the reception of an escape sequence the GE864 / GC864 closes the connection, deactivates
the GPRS context returning to command mode and issuing the NO CARRIER code.
5.1.3 Enhanced Easy GPRS Outgoing connection
The New Enhanced Easy GPRS feature provides a way to place outgoing TCP/UDP connections
and keep the same IP address after a connection, leaving the GPRS context active.
The steps that will be required open a socket and close it without closing the GRPS context are:
g) configuring the GPRS Access
h) configuring the embedded TCP/IP stack behavior
i) defining the Internet Peer to be contacted
j) request the GPRS context to be activated
k) request the socket connection to be opened
l) exchange
data
m) close the TCP connection while keeping the GPRS active
All these steps are achieved through AT commands. As for common modem interface, two logical
statuses are involved: command mode and data traffic mode.
