TM4C129X - Amazon Web Services(AWS)/Ubidots IoT API

/*
 * Ubidots C client.
 *
 * Copyright (c) 2013 Ubidots.
 */

#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <curl/curl.h>
#include <jansson.h>
#include "ubidots.h"
#include "ubirequest.c"

/**
 * Save a value to Ubidots.
 * @arg client       Pointer to UbidotsClient
 * @arg variable_id  The ID of the variable to save to
 * @arg value        The value to save
 * @arg timestamp    Timestamp (millesconds since epoch). Pass TIMESTAMP_NOW
 *                   to have the timestamp automatically calculated.
 * @return Zero upon success, Non-zero upon error.
 */
int ubidots_save_value(UbidotsClient *client, char *variable_id, double value, long long timestamp) {
  char url[80];
  char json_data[80];

  if (timestamp == TIMESTAMP_NOW)
    timestamp = (long long)time(NULL) * 1000;

  sprintf(url, "%s/variables/%s/values", client->base_url, variable_id);
  sprintf(json_data, "{\"value\": %g, \"timestamp\": %lld}", value, timestamp);

  return ubi_request("POST", url, client->token, json_data, NULL);
}


/**
 * Initialize a Ubidots session. This is most likely the first Ubidots
 * library function you will call.
 * @arg api_key  Your API key for the Ubidots API.
 * @return Upon success, a pointer to a UbidotsClient. Upon error, NULL.
 */
UbidotsClient* ubidots_init(char *api_key) {
  return ubidots_init_with_base_url(api_key, DEFAULT_BASE_URL);
}


UbidotsClient* ubidots_init_with_base_url(char *api_key, char *base_url) {
  // Perform an API request to generate a new token for the given API key.
  char url[80];
  char token_hack[80];
  int rc;
  json_t *j_root, *j_token;
  
  sprintf(url, "%s/auth/token", base_url);
  sprintf(token_hack, "/%s", api_key);
  
  rc = ubi_request("POST", url, token_hack, "", &j_root);
  
  if (rc)
    return NULL;
  
  j_token = json_object_get(j_root, "token");

  // Allocate and set fields of struct
  UbidotsClient *client = malloc(sizeof(UbidotsClient));  

  strncpy(client->base_url, base_url, STRLEN_BASE_URL);
  strncpy(client->api_key, api_key, STRLEN_API_KEY);
  strncpy(client->token, json_string_value(j_token), STRLEN_TOKEN);

  json_decref(j_root);

  return client;
}


/**
 * End a ubidots session. After calling this function with UbidotsClient* client,
 * no more functions may be called with it.
 */
void ubidots_cleanup(UbidotsClient *client) {
  free(client);
}


int main() {
	char API_KEY[] = "4eab4440fe98e0eb5ab432691f80fbc3434b76f4";
	char VARIABLE_ID[] = "57d7ba927625425b779a7340";
     UbidotsClient *client = ubidots_init(API_KEY);

     //while ( keepGoing() ) {
       double value = 10; //getValue();
       ubidots_save_value(client, VARIABLE_ID, value, TIMESTAMP_NOW);
     //}
  
     ubidots_cleanup(client);

     return 0;
   }