Technical information

Connection
2-8 AT+i Commands Reference Manual May 31, 2008
open TCP active sockets, but leaves UDP sockets and TCP passive (listening) sockets
intact and updates their local IP if a new IP is assigned after establishing a new PPP
connection. W24 does not close any open Internet sessions (FTP/Telnet sessions and
so on), nor releases the handle of the active TCP sockets, thus giving the host a chance
to read the session errors and get buffered incoming data from active TCP sockets.
• When the PFR is larger than 0 and the PDSn parameters are configured, W24 verifies
that it is online by sending PING messages to the PING destination servers defined in
PDSn at a polling frequency defined by PFR. If both PING destination servers do not
respond, W24 concludes that the Internet connection failed and tries to reestablish an
Internet connection, as described above for the case of a lost carrier signal.
+iDOWN - Terminate Internet Session
Syntax: AT+iDOWN
Performs a software reset. Terminates an ongoing Internet session, goes
offline and returns to Command mode.
This command is useful in a dialup environment following a command
where the stay online flag (!) was specified.
All open sockets are closed and the web server deactivated.
Result Code:
I/OK If n is within limits.
Followed by:
I/ERROR After terminating the current Internet session when the command caused
W24 to abort an ongoing Internet activity or close an active socket.
-or-
I/DONE After terminating the current Internet session. Allow a 2.5 sec. delay for
W24
re-initialization following an Internet mode session. Relevant for W24 in
dial-up mode only.
-or-
I/ONLINE After terminating the current Internet session.