Motorola G24 用户手册

This AT command is used to control filtering feature. Filtering feature adds the ability to accept 
IP connections only if the IP belongs to a defined IP white list to the embedded TCP/IP feature. 
This feature affects only TCP socket type connections.

The set command 
defines the IP 
white list and 
controls the 
feature behavior 
(enable or 
disable).
If <CmdType> is 
0, 1 or 4, then <IP 
CIDR> parameter 
is not allowed.
If <IP CIDR> 
parameter will be 
present in that 
case, the error 
message will be 
returned to DTE.
If <CmdType> is 2 
(add IP to white 
list) or 3 (remove 
IP from white list), 
the <IP CIDR> 
parameter is 
mandatory.

For each socket 
the command 
returns the current 
filtering feature 
state (enabled, 
disabled or not 
applicable) and a 
list of IP addresses 
(in CIDR notation) 
in socket filtering 
white list.
In case the 
connection is set 
for "client" 
functionality 
(socket initiates 
the connection) 
the filtering status 
is 2 ("not 
applicable").

The command 
returns the range 
of <SocketID>'s, 
the list of 
supported 
<CmdType>'s and 
string "<IP 
CIDR>".