A test code for the Adafruit CC3000 breakout, based on their "WebClient.ino" example at: https://github.com/adafruit/Adafruit_CC3000_Library

webclient_ubidots.ino

/*************************************************** 
  This is an example for the Adafruit CC3000 Wifi Breakout & Shield

  Designed specifically to work with the Adafruit WiFi products:
  ----> https://www.adafruit.com/products/1469

  Adafruit invests time and resources providing this open source code, 
  please support Adafruit and open-source hardware by purchasing 
  products from Adafruit!

  Written by Limor Fried & Kevin Townsend for Adafruit Industries.  
  BSD license, all text above must be included in any redistribution
 ****************************************************/
 
 //Modified by Agustin Pelaez on Jun 15 2015 for Ubidots, Inc.

#include <Adafruit_CC3000.h>
#include <ccspi.h>
#include <SPI.h>
#include <string.h>
#include "utility/debug.h"



// These are the interrupt and control pins
#define ADAFRUIT_CC3000_IRQ   3  // MUST be an interrupt pin!
// These can be any two pins
#define ADAFRUIT_CC3000_VBAT  5
#define ADAFRUIT_CC3000_CS    10
// Use hardware SPI for the remaining pins
// On an UNO, SCK = 13, MISO = 12, and MOSI = 11
Adafruit_CC3000 cc3000 = Adafruit_CC3000(ADAFRUIT_CC3000_CS, ADAFRUIT_CC3000_IRQ, ADAFRUIT_CC3000_VBAT,
                                         SPI_CLOCK_DIVIDER); // you can change this clock speed
Adafruit_CC3000_Client www;

#define WLAN_SSID       "xxxxxx"           // cannot be longer than 32 characters!
#define WLAN_PASS       "xxxxxx"
// Security can be WLAN_SEC_UNSEC, WLAN_SEC_WEP, WLAN_SEC_WPA or WLAN_SEC_WPA2
#define WLAN_SECURITY   WLAN_SEC_WPA2

// Ubidots information:

#define WEBSITE      "things.ubidots.com"
char* token = "YOUR-UBIDOTS-TOKEN";  
char* idvariable = "YOUR-VARIABLE-ID";


/**************************************************************************/
/*!
    @brief  Sets up the HW and the CC3000 module (called automatically
            on startup)
*/
/**************************************************************************/

uint32_t ip;

void setup(void)
{
  Serial.begin(115200);
  Serial.println("Hello, CC3000!\n"); 
  /* Initialise the module */
  Serial.println(F("\nInitializing..."));
  if (!cc3000.begin())
  {
    Serial.println(F("Couldn't begin()! Check your wiring?"));
    while(1);
  }
  
  Serial.print(F("\nAttempting to connect to ")); Serial.println(WLAN_SSID);
  if (!cc3000.connectToAP(WLAN_SSID, WLAN_PASS, WLAN_SECURITY)) {
    Serial.println(F("Failed!"));
    while(1);
  }
   
  Serial.println(F("Connected!"));
  
  /* Wait for DHCP to complete */
  Serial.println(F("Request DHCP"));
  while (!cc3000.checkDHCP())
  {
    delay(100); // ToDo: Insert a DHCP timeout!
  }  

  /* Display the IP address DNS, Gateway, etc. */  
  while (! displayConnectionDetails()) {
    delay(1000);
  }  
   Serial.print(F("Checking WiFi connection ..."));
   if(!cc3000.checkConnected()){while(1){}}
   Serial.println(F("done."));
 }
  
void connect_socket()
{
    ip = 0;
    // Try looking up the website's IP address
    Serial.println(F("connecting socket"));
    while (ip == 0) {
      if (! cc3000.getHostByName(WEBSITE, &ip)) {
        Serial.println(F("Couldn't resolve IP!"));
      }
      delay(1000);
    }
}
  
void loop(void)
{
    save_value(String(analogRead(A0)));
    delay(2000);
}

void save_value(String value)
{
    connect_socket();
    www = cc3000.connectTCP(ip, 80);
    if(!(www.available()))
    {
      delay(500);
    }
    Serial.println(("TCP connection established."));
    String var = "{\"value\":"+ value + "}";
    
    if (www.connected()) {
      Serial.print(F("\nSending data to ubidots ..."));
      www.println("POST /api/v1.6/variables/");
      www.print(idvariable);
      www.println("/values HTTP/1.1");
      www.println("Content-Type: application/json");
      www.print("Content-Length: ");
      www.println(String(var.length()));       // The length of the body of the http request
      www.print("X-Auth-Token: ");
      www.println(token);
      www.println("Host: things.ubidots.com");
      www.println();
      www.println(var);                        // The JSON formatted body: {"value":xx} 
      www.println();
    } 
    else {
      Serial.println(F("Connection failed"));  
    }
    
    // Read the response
    
    while (www.available()) {
      char c = www.read();
      Serial.print(c);
    }
  www.close();    
}


/**************************************************************************/
/*!
    @brief  Tries to read the IP address and other connection details
*/
/**************************************************************************/
bool displayConnectionDetails(void)
{
  uint32_t ipAddress, netmask, gateway, dhcpserv, dnsserv;
  
  if(!cc3000.getIPAddress(&ipAddress, &netmask, &gateway, &dhcpserv, &dnsserv))
  {
    Serial.println(F("Unable to retrieve the IP Address!\r\n"));
    return false;
  }
  else
  {
    Serial.print(F("\nIP Addr: ")); cc3000.printIPdotsRev(ipAddress);
    Serial.print(F("\nNetmask: ")); cc3000.printIPdotsRev(netmask);
    Serial.print(F("\nGateway: ")); cc3000.printIPdotsRev(gateway);
    Serial.print(F("\nDHCPsrv: ")); cc3000.printIPdotsRev(dhcpserv);
    Serial.print(F("\nDNSserv: ")); cc3000.printIPdotsRev(dnsserv);
    Serial.println();
    return true;
  }
}