16 socket listen - #sktl – Rainbow Electronics GM862-QUAD-PY User Manual
Page 352
AT Commands Reference Guide
80000ST10025a Rev. 5 - 09/07/08
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved
page 352 of 434
#SKTD - Socket Dial
SELINT 2
CONNECT
In this way my local port 1025 is opened to the remote
port 1024
AT#SKTD=0,1024,"www.telit.net", 255
CONNECT
Note
The main difference between this command and #SKTOP is that this
command does not interact with the GPRS context status, leaving it ON or
OFF according to the #GPRS setting, therefore when the connection made
with #SKTD is closed the context (and hence the local IP address) is
maintained.
3.5.7.5.16 Socket Listen - #SKTL
#SKTL - Socket Listen
SELINT 0 / 1
AT#SKTL
[=<mode>,
<socket type>,
<input port>,
[<closure type>]]
Execution command opens/closes the socket listening for connection
requests.
Parameters:
<mode> - socket mode
0 - closes socket listening
1 - starts socket listening
<socket type> - socket protocol type
0 - TCP
<input port> - local host input port to be listened
0..65535 - port number
<closure type> - socket closure behaviour for TCP
0 - local host closes immediately when remote host has closed (default)
255 - local host closes after an escape sequence (+++) or after an abortive
disconnect from remote.
Command returns the OK result code if successful.
Note: the command to be successful requests that:
- the GPRS context 1 is correctly set with +CGDCONT
- the authentication parameters are set (#USERID, #PASSW)
- the GPRS coverage is enough to permit a connection
- the GPRS has been activated with AT#GPRS=1
When a connection request comes on the input port, if the sender is not
filtered by the internal firewall (see command #FRWL), an unsolicited code
is reported:
+CONN FROM: <remote addr>
Where:
<remote addr> - host address of the remote machine that contacted the