SIM900 GPRS HTTP AT Commands

Before you begin make sure your SIM900 GSM module has acquired the network and it is ringing when you make a call to it. Then test the basic AT commands and then proceed further.

Once you are ready, you can start by first setting up the GPRS connection as follows, 

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Text in RED is typed by me and text in GREEN is the response from SIM900 module.

 Setting up GPRS connection

Set the connection type to GPRS

AT+SAPBR=3,1,”Contype”,”GPRS”

OK

 

Set the APN to to “www” since i am using a Vodafone SIM card, It might be different for you, and depends on the network

AT+SAPBR=3,1,”APN”,”www”

OK

 

Enable the GPRS

AT+SAPBR =1,1

OK

 

Query if the connection is setup properly, if we get back a IP address then we can proceed

AT+SAPBR=2,1

+SAPBR: 1,1,”100.120.204.132″

OK

 

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Getting the contents of a webpage from the server

We will get the content of the webpage from my old website at the url http://www.marsinnovations.in/testout.php, which is a simple web page that puts out some dummy text as shown below. You can retrieve any webpage you want. 

We were allocated a IP address and now we can proceed by enabling the HTTP mode

AT+HTTPINIT

OK

 

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OPTIONAL,  ONLY IF URL is HTTPS or SSL enabled: Also Remove the http:// part in the HTTPPARA=”URL”,xxxx command

AT+HTTPSSL=1

OK

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Start by setting up the HTTP bearer profile identifier

AT+HTTPPARA=”CID”,1

OK

 

Set the url  to the address of the webpage you want to access

AT+HTTPPARA=“URL”,”http://marsinnovations.in/testout.php”

OK

 

Start the HTTP GET session, by giving this command

AT+HTTPACTION=0

OK

 

The below output from module indicates it  has read 654 bytes of data and the response of the HTTP GET request is 200, which means success

+HTTPACTION:0,200,654

 

The below command tells the module that we want to read the received data

AT+HTTPREAD

The below is the data read from the webpage

+HTTPREAD:654

Logged Meter Readings:<br>Date Time: Current Voltage Temp.<br>

<br>Mon May 19 23:56:12 2014 :485683465429634

<br> :485683465429634

<br>Tue May 20 00:00:13 2014 :948598437599980

<br>Tue May 20 00:04:41 2014 :948598437599980

<br>Tue May 20 00:24:39 2014 :9485

<br>Tue May 20 00:25:37 2014 :9485

<br>Tue May 20 00:40:50 2014 :23423

<br>Wed May 21 00:07:19 2014 :948598437599980

<br>Wed May 21 00:43:20 2014 :34234324

<br>Wed May 21 00:47:15 2014 :34234324

<br>Wed May 21 11:12:10 2014 :34234324

<br>Wed May 21 15:23:22 2014 :34234324

<br>Wed May 21 15:28:07 2014 :564575676

<br>Wed May 21 15:38:06 2014 :564575676

<br>Wed May 21 15:43:53 2014 :564575676<br>

OK 

The contents above are the contents of the webpage shown before. 

 

See next page for the HTTP post request >>