Technical information

Use Case - Gateway/Router Mode
D-4 AT+i Commands Reference Manual May 31, 2008
Note: In case of Gateway/Router mode using, the following parameters and commands should
be used to configure the mode behavior:
• Automatic Router Start (AT+iARS) parameter - When set to 1, causes W24 to go
online in Gateway/Router mode upon power-up. A default value is 0;
• Start Router (AT+iSTRR) command - Causes W24 to go online in Gateway/Router
mode.
• Stop Router (AT+iSTPR) command - Causes W24 to exit Gateway/Router mode and
go offline.
• Inactivity Timeout (AT+iIATO) parameter - When in Gateway/Router mode, if no
activity is detected for the period of time specified by this parameter, W24 disconnects
its modem side and go offline.
Use Case - Gateway/Router Mode
W24 together with GSM/GPRS modem (G24) supports functionality as a gateway/router
between 802.11 (WLAN) and Cellular networks (see Figure D-2).
For this mode the W24 shall be configured as a Gateway/Router (see an example of the
configuration command sequence in the table below). In this mode WLAN stations
communicating to W24 on the WLAN can use the W24 as a gateway to the Internet through the
Cellular modem. The W24 will handle routing and Network Address Translation between the
Cellular uplink to the Internet and local WLAN stations. In this mode W24 coupled with G24 can
be used without any host connected, as a standalone device.
Using the CPF parameter, you can select either one of the communication platforms at a time.
When CPF=0, AT+i commands affect the dialup/cellular side; when CPF=1, they are directed at
the WiFi side. While accepting AT+i commands, W24 continues to route packets seamlessly
between the two platforms. W24's responses to AT+i commands depend on the CPF value, as
well. For example, the IP returned by AT+iIPA? command while CPF=1 is the WLAN-side IP.