Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 178 23.06.2010
If the module is set as server
S: 0, <bearer>, <port>, <server state>
C: <n>,<bearer>, <TCP/UDP>, <IP address>, <port>, <client state>
Parameters
<n> 0-7 a numeric parameter which indicates the connection number
<bearer> 0-1 GPRS bearer, default is 0
<server state> OPENING,
LISTENING,
CLOSING
< client state > INITIAL
CONNECTING
CONNECTED
REMOTE CLOSING
CLOSING
CLOSED
<state> a string parameter(string should be included in quotation
marks) which indicates the progress of connecting
0 IP INITIAL
1 IP START
2 IP CONFIG
3 IP GPRSACT
4 IP STATUS
5 TCP CONNECTING/UDP CONNECTING
/SERVER LISTENING
6 CONNECT OK
7 TCP CLOSING/UDP CLOSING
8 TCP CLOSED/UDP CLOSED
9 PDP DEACT
In Multi-IP state:
0 IP INITIAL
1 IP START
2 IP CONFIG
3 IP GPRSACT
4 IP STATUS
5 IP PROCESSING
9 PDP DEACT
Reference Note
8.2.13 AT+CDNSCFG Configure Domain Name Server
AT+CDNSCFG Configure Domain Name Server