HttpClient - connection failed (ubidots)

Troubleshooting
2

Hi @itayd100,

Last month we discussed in this thread about the stability of the Spark when sending continuous HTTP requests. Following the suggestions there, I re-wrote the code to connect the Spark to Ubidots (below). Basically, it uses the function “sprintf” instead of concatenating strings to setup the HTTP request body, which does a better handling of the internal memory allocation.

#include "HttpClient/HttpClient.h"

/**
* Declaring the variables.
*/
HttpClient http;

#define VARIABLE_ID "xxxxxxxxxx"
#define TOKEN "xxxxxxxxxxxxxxxxxxxxxx"

float voltage = 0.0;
char resultstr[64];

// Headers currently need to be set at init, useful for API keys etc.
http_header_t headers[] = {
      { "Content-Type", "application/json" },
      { "X-Auth-Token" , TOKEN },
    { NULL, NULL } // NOTE: Always terminate headers will NULL
};

http_request_t request;
http_response_t response;

void setup() {
    pinMode(A0, INPUT);
    request.hostname = "things.ubidots.com";
    request.port = 80;
    //Serial.begin(9600);
}

void loop() {

    // Get variable

    voltage = analogRead(A0);

    // Send to Ubidots

    request.path = "/api/v1.6/variables/"VARIABLE_ID"/values";
    sprintf(resultstr, "{\"value\":%.4f}",voltage);
    request.body = resultstr;

    http.post(request, response, headers);

    //Serial.println(response.status);

    //Serial.println(response.body);

    delay(1000);
}