Enfora GSM2228UG001 ユーザーズマニュアル

 

GSM2228UG001                                                                                                            Page 34 

If AT$NETIP returns all zeros, send the following command:  
 

AT$CGEER<CR> 

 

There are three common responses: 
 

$CGEER: no PDP reject cause  

(Everything should be working properly) 
 

$CGEER: requested service option not subscribed  

(APN is incorrect or SIM has not been enabled for data mode.) 
 

$CGEER: user authentication failed  

(username and/or password is incorrect.) 

 

 
 

 
To configure the modem for server interoperability, several things have to be addressed: 

 

•  Most GPRS configurations are Mobile Originate only.  The mobile modem must 

initiate a conversation with a remote server before the remote server can talk to 
the modem. 

•  IP addresses are dynamically assigned and can change. 

•  Some IP addresses are NAT and are non-routable. 

 

These issues are addressed with the following configuration commands. 

 

The examples will use the following information: 

 

•  Modem ID/name = “MMT_Test” 

•  Remote Server IP address = apitest.enfora.com 
•  Remote Server IP port = 1721 

 

Give the modem a unique name with the following command: 

 

AT$MDMID=”MMT_Test” 

 

NOTE:  This command, combined with the wakeup message, will allow the server 
to associate a Public IP address with a specific modem and create a window of 
opportunity where the server can send commands to the modem.