Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 180 23.06.2010
12 DNS NO SERVER ADDR,
13 DNS NO MEMORY,
14 DNS INVALID NAME,
15 DNS INVALID RESP,
There are some other error code as well.
Reference Note
8.2.15 AT+CIPHEAD Add An IP Head When Receiving Data
AT+CIPHEAD Add An IP Head When Receiving Data
Test Command
AT+CIPHEAD=
?
Response
+CIPHEAD: (list of supported <mode>s)
OK
Parameter
See Write Command
Read Command
AT+CIPHEAD?
Response
+CIPHEAD: <mode>
OK
Parameter
See Write Command
Write Command
AT+CIPHEAD=
<mode>
Response
OK
ERROR
Parameter
<mode> a numeric parameter which indicates whether adding an IP
header to received data or not
0 not add IP header
1 add IP header, the format is “+IPD,data length:”
Reference Note
This command will be effective only in single connection mode
(+CIPMUX=0)
8.2.16 AT+CIPATS Set Auto Sending Timer
AT+CIPATS Set Auto Sending Timer
Test Command
AT+CIPATS=?
Response
+CIPATS: (list of supported <mode>s),(list of supported <time>)
OK
Parameters