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GPRS module HTTP GET/POST

Former Member

Hello Everyone,

I've been working on a LoNet mini GSM module (SIM800L), interfacing it with Arduino.

I've inserted the SIM mobile card with Internet connection available.

Through serial monitor I'm communicating with it with no problems, but when it comes to make a GET or a POST request to a webserver page it returns Network Error (601).

Here it is:

 

AT+SAPBR=3,1,"CONTYPE","GPRS"

OK

 

AT+HTTPINIT

OK

 

AT+HTTPPARA="CID",1

OK

 

AT+HTTPPARA="URL","http://<Public_Ip_Address>:8080/folder/savedata.php"

OK

 

AT+HTTPACTION=0

OK

+HTTPACTION: 0,601,0      //601: Network Error

 

AT+HTTPREAD=1,100000

OK

 

And no response of the "echo" of the php page...

Do you have any suggestion?

Thanks in advance.

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  • Usually after this command AT+SAPBR=3,1,"CONTYPE","GPRS" you  enter your "APN", "USR" & "PWD" details also using SAPBR=3,1 etc. These details must match the SIM card / mobile phone provider.

     

    Then it is recommended to check that your device has now received an IP address. Sometimes this is not straight away. Use AT+SAPBR=2,1 to query and this will return your IP address which you should check for confirmation.

     

    Once you have IP address you can enter AT+HTTPINIT, AT+HTTPPARA="CID",1 etc.

     

    Now to use GET you have to include a "?" after the URL to provide your php script with a key=value pairing.

     

    Thus in your case it is something like, AT+HTTPPARA="URL","http://<Public_Ip_Address>:8080/folder/savedata.php?A=1001" where A is the key and 1001 is the value.

     

    Now send the AT+HTTPACTION=0 and you should get a +HTTPACTION: 0,200,1000 response where 200 is the OK and 1000 is the payload size. AT+HTTPREAD will allow you to read the response if it is required.

  • in reply to BigG

    Hi BigG, thanks to your response, it is very useful to me...

    What I still don't understand is:

     

    why do I have to set APN (access point name), USR, PSW, if I don't connect to the Internet using an Access Point?

    I want to connect to the Internet using GPRS directly, without passing through a Lan or through a Router which I have to connet to.

    Thanks again.

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  • in reply to BigG

    Hi BigG, thanks to your response, it is very useful to me...

    What I still don't understand is:

     

    why do I have to set APN (access point name), USR, PSW, if I don't connect to the Internet using an Access Point?

    I want to connect to the Internet using GPRS directly, without passing through a Lan or through a Router which I have to connet to.

    Thanks again.

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