Specifications

SIM900 AT Commands Set
SIM900_ATC_V1.01 174 23.06.2010
If in single IP
connection
(+CIPMUX=0)
AT+CIPACK
Parameters
See write command
Write Command
If in multi IP
connection
(+CIPMUX=1)
AT+CIPACK=<
n>
Response
+CIPACK: <txlen>, <acklen>, <nacklen>
OK
Parameters
<n> a numeric parameter which indicates the connection number
<txlen> the data amount which has been sent
<acklen> the data amount confirmed successful by the server
<nacklen> the data amount without confirmed by the server
Reference Note
8.2.6 AT+CIPCLOSE Close TCP or UDP Connection
AT+CIPCLOSE Close TCP or UDP Connection
Test Command
AT+CIPCLOSE
=?
Response
OK
Execution
Command
AT+CIPCLOSE
Response
If close successfully:
CLOSE OK
If close fail:
ERROR
Write Command
1) If single IP
connection
(+CIPMUX=0)
AT+CIPCLOSE
=<id>
2) If multi IP
connection
(+CIPMUX=1)
AT+CIPCLOSE
=<n>, [<id>]
Response:
1) If single IP connection (+CIPMUX=0)
CLOSE OK
2) If multi IP connection (+CIPMUX=1)
<n>, CLOSE OK
Parameters
<id> 0 slow close
1 quick close
<n> a numeric parameter which indicates the connection number
Reference Note