HTTP POST sample

We don't seem to have a POST example. I've asked for help with this from some of the authors of that HTTP code.

Alan

Hi Vikram

Thank you so much for the reply.

As per your instruction, made the changes in the code, am getting the following error:

//********************************************************************************************************

ss in flash

Starting the HTTP GET example

System provider is set to SysMin. Halt the target to view any SysMin contents in ROV.

Service Status: DHCPC    : Enabled  :          : 000

Service Status: DHCPC    : Enabled  : Running  : 000

Network Added: If-1:172.28.6.153

Service Status: DHCPC    : Enabled  : Running  : 017

Sending a HTTP POST request to 'things.ubidots.com'

sendRequest successful

sendField successful

Data sent successfully

Error! code = 400, desc = httpTask: cannot get status

//***********************************************************************************************************

These are the changes in the code:

//************************************************************************************************************
    ret = HTTPCli_sendRequest(&cli, HTTPStd_POST, REQUEST_URI, true);
    if (ret < 0) {
        printError("httpTask: send failed", ret);
    }
    else {
    	System_printf("sendRequest successful\n");
    }

    ret = HTTPCli_sendField(&cli, HTTPStd_FIELD_NAME_CONTENT_TYPE, CONTENT_TYPE, true);
//    ret = HTTPCli_sendField(&cli, HTTPStd_FIELD_NAME_CONTENT_LENGTH, CONTENT_LENGTH, true);
    if (ret < 0) {
    	printError("httpTask: send failed", ret);
    }
    else {
    	System_printf("sendField successful\n");
    }

    strcpy(data, "{\"value\":10}");
    ret = HTTPCli_sendRequestBody(&cli, data, strlen(data));
    if (ret < 0) {
    	printError("httpTask: Variable data couldn't be sent", ret);
    }
    else {
    	System_printf("Data sent successfully\n");
    }
//*************************************************************************************************************************************

Any help would be greatly appreciated.

Thanks & Regards

Yash Bhan

Yash,

The HTTP status code 400 occurs when the request sent is malformed. I took a quick look at the your code and also the API reference for ubidots. It looks like you are trying to send a value. If that's correct, then here is the ubidots REST API example for sending a value:

POST /api/v1.6/devices/{DATA_SOURCE_LABEL}/?token={TOKEN} HTTP/1.1
Host: things.ubidots.com
Content-Type: application/json
Content-Length: 76

{"temperature": 10, "luminosity": {"value":10}, "wind_speed": [{"value": 11, "timestamp":10000}, {"value": 12, "timestamp":13000}]}

One obvious header that you are missing in your code is the "Content-Length" header. Without this header, the server will not know how many bytes of data to read in the HTTP body. The value of this header should be the length of data that you are sending.

Try adding this header and also make sure other headers, labels and tokens are as per the ubidots REST API.

Vikram

Hello Vikram

Thank you so much for the help, i added the content length header and am now able to post data to the cloud, thanks a lot for the solution!
I just wanted to know if the same is possible for the HTTPS GET sample

Thanks
Yash Bhan

Hi Yash Bhan,
I am facing the same 400 error and not yet get solved even I worked for a week, can you please share picture how you solve it, followed same way of coding. Thank you.
Regards,
Raghu DS.

Hi Raghu,
We generally discourage posting a new question to an old closed thread because the person who answered before may no longer be available, and also it will allow whomever is currently assigned to monitor the forum to respond to you more quickly. For these reasons, I suggest you start a new thread with your question and reference this thread.

Thank you

Hello Raghu

These are the headers that were used:

#define HOSTNAME          "things.ubidots.com"
#define REQUEST_URI       "/api/v1.6/devices/test/?token={value}"
#define USER_AGENT        "HTTPCli (ARM; TI-RTOS)"
#define CONTENT_TYPE	  "application/json"
#define HTTPTASKSTACKSIZE 4096

This is the httpTask function, that sends the POST request:

Void httpTask(UArg arg0, UArg arg1)
{
    bool moreFlag = false;
    char data[64];
    int ret;
    int len;
    char CONTENT_LENGTH[3];
    struct sockaddr_in addr;


    //Data to be sent
    strcpy(data, "{\"val\": 10}");

    len = strlen(data);
    sprintf(CONTENT_LENGTH, "%d", len);

    System_printf("\nData: %s\n", data);
    System_printf("len(int): %d\n", len);
    System_printf("CONTENT_LENGTH: %s\n", CONTENT_LENGTH);

    HTTPCli_Struct cli;
    HTTPCli_Field fields[3] = {
        { HTTPStd_FIELD_NAME_HOST, HOSTNAME },
        { HTTPStd_FIELD_NAME_USER_AGENT, USER_AGENT },
        { NULL, NULL }
    };

    System_printf("Sending a HTTP POST request to '%s'\n", HOSTNAME);
    System_flush();

    HTTPCli_construct(&cli);

    HTTPCli_setRequestFields(&cli, fields);

    ret = HTTPCli_initSockAddr((struct sockaddr *)&addr, HOSTNAME, 0);
    if (ret < 0) {
        printError("httpTask: address resolution failed", ret);
    }

    ret = HTTPCli_connect(&cli, (struct sockaddr *)&addr, 0, NULL);
    if (ret < 0) {
        printError("httpTask: connect failed", ret);
    }

//************************************************************************************************************
    ret = HTTPCli_sendRequest(&cli, HTTPStd_POST, REQUEST_URI, true);
    if (ret < 0) {
        printError("httpTask: send failed", ret);
    }
    else {
       	System_printf("sendRequest successful\n");
    }

    ret = HTTPCli_sendField(&cli, HTTPStd_FIELD_NAME_CONTENT_LENGTH, CONTENT_LENGTH, false);
    ret = HTTPCli_sendField(&cli, HTTPStd_FIELD_NAME_CONTENT_TYPE, CONTENT_TYPE, true);

    if (ret < 0) {
    	printError("httpTask: send failed", ret);
    }
    else {
       	System_printf("sendField successful\n");
    }

        ret = HTTPCli_sendRequestBody(&cli, data, strlen(data));
    if (ret < 0) {
       	printError("httpTask: Variable data couldn't be sent", ret);
    }
    else {
       	System_printf("Data sent successfully\n");
    }
//*******************************************************************************************************************************

    ret = HTTPCli_getResponseStatus(&cli);
    if (ret != HTTPStd_OK) {
        printError("httpTask: cannot get status", ret);
    }

    System_printf("HTTP Response Status Code: %d\n", ret);

    ret = HTTPCli_getResponseField(&cli, data, sizeof(data), &moreFlag);

    if (ret != HTTPCli_FIELD_ID_END) {
        printError("httpTask: response field processing failed", ret);
    }

    len = 0;
    do {
        ret = HTTPCli_readResponseBody(&cli, data, sizeof(data), &moreFlag);
        if (ret < 0) {
            printError("httpTask: response body processing failed", ret);
        }

        len += ret;
    } while (moreFlag);

    System_printf("Received %d bytes of pay-load\n", len);
    System_flush();

    HTTPCli_disconnect(&cli);
    HTTPCli_destruct(&cli);
}

Hi Yash Bhan,
Thanks for the reply, I done with this.
And you are trying for the "HttpsPost", are you done with this.
I am also trying the HttpsPost and I was getting the Gateway Timeout respose code "504".

regards,
Raghu DS

Hi Raghu

I'm trying for HTTPS POST, but am also getting the same error

Regards
Yash Bhan

Hi yash Bhan,
It seems, this is server problem please check "www.keycdn.com/.../"
Are you tried with any of your server?
We are till creating the "https" server, afterwards has to check.
Please keep on updating I will also do.

Regards,
Raghu DS

Hello Raghu

Im trying to connect to AWS server, they use only HTTPS.
Am facing issues with the same.

Regards
Yash Bhan

Hi Yash,

The error 504 is resolved for me. This is because the defined content length sending should be equal to the buffer length. As my content length is more than the buffer length the server is waiting for remaining buffer, so time out happening. The content length can be less than the buffer but not more than, please make sure this.

Regards,

Raghu DS.