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Author Topic: Arduino ethernet shield, send data to Xively  (Read 536 times)
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There are two ways to send data to Xively.  

1)  Use the Xively library,
2)  forms a string that is sent to the Xively server.

I've gotten the Xively library method to work, so I know that the ethernet shield connects to my home network OK, but I'd like to use the other method.  I'm trying to use an nRF24L01+ on the same SPI bus as the ethernet shield, and there's something goofy going on that I need to turn off the Ethernet shield in order to use the nRF24L01.

So I think I have to use the second method.  My attempts at using the sample code hasn't lead me anywhere, however.  I'm using this tutorial:

And really didn't modify the code much, just entered in my feed ID and stuff.  This is the output I get from the serial monitor:


You do not have permission to access this resource
HTTP/1.1 401 Unauthorized
Date: Sat, 29 Mar 2014 23:28:16 GMT
Content-Type: text/plain; charset=utf-8
Content-Length: 50
Connection: close
WWW-Authenticate: Basic realm="Web Password"
X-Request-Id: xxxxxxx
Set-Cookie: _pachcore_app_session=xxxxxxx;; path=/; expires=Sat, 12-Apr-2014 23:28:16 GMT; HttpOnly

You do not have permission to access this resource

Here's my code, with the private stuff taking out.  If you wouldn't mind taking a look and giving me some advice?  I got this code from here:


  Xively sensor client
 This sketch connects an analog sensor to Xively (
 using a Wiznet Ethernet shield. You can use the Arduino Ethernet shield, or
 the Adafruit Ethernet shield, either one will work, as long as it's got
 a Wiznet Ethernet module on board.
 This example has been updated to use version 2.0 of the API.
 To make it work, create a feed with a datastream, and give it the ID
 sensor1. Or change the code below to match your feed.
 * Analog sensor attached to analog in 0
 * Ethernet shield attached to pins 10, 11, 12, 13
 created 15 March 2010
 modified 9 Apr 2012
 by Tom Igoe with input from Usman Haque and Joe Saavedra
 This code is in the public domain.

#include <SPI.h>
#include <Ethernet.h>

#define APIKEY         "xxxxxxxx" // replace your xively api key here
#define FEEDID         xxxxxxxx // replace your feed ID
#define USERAGENT      "Arduinnoooo" // user agent is the project name

// assign a MAC address for the ethernet controller.
// Newer Ethernet shields have a MAC address printed on a sticker on the shield
// fill in your address here:
byte mac[] = {0xDE, 0xAD, 0xEE, 0xEE, 0xEE, 0x11};

// fill in an available IP address on your network here,
// for manual configuration:
IPAddress ip(192,168,2,230);
// initialize the library instance:
EthernetClient client;

// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
IPAddress server(173,203,98,29);      // numeric IP for
//char server[] = "";   // name address for xively API

unsigned long lastConnectionTime = 0;          // last time you connected to the server, in milliseconds
boolean lastConnected = false;                 // state of the connection last time through the main loop
const unsigned long postingInterval = 10*1000; //delay between updates to

void setup() {
 // Open serial communications and wait for port to open:
   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only


 // start the Ethernet connection:
  if (Ethernet.begin(mac) == 0) {
    Serial.println("Failed to configure Ethernet using DHCP");
    // DHCP failed, so use a fixed IP address:
    Ethernet.begin(mac, ip);

void loop() {
  // read the analog sensor:
  int sensorReading = 5;  

  // if there's incoming data from the net connection.
  // send it out the serial port.  This is for debugging
  // purposes only:
  if (client.available()) {
    char c =;

  // if there's no net connection, but there was one last time
  // through the loop, then stop the client:
  if (!client.connected() && lastConnected) {

  Serial.println("waiting to send data!");
  // if you're not connected, and ten seconds have passed since
  // your last connection, then connect again and send data:
  if(!client.connected() && (millis() - lastConnectionTime > postingInterval)) {
  // store the state of the connection for next time through
  // the loop:
  lastConnected = client.connected();

// this method makes a HTTP connection to the server:
void sendData(int thisData) {
  // if there's a successful connection:
  if (client.connect(server, 80)) {
    // send the HTTP PUT request:
    client.print("PUT /v2/feeds/");
    client.println(".csv HTTP/1.1");
    client.print("X-XivelyApiKey: ");
    client.print("User-Agent: ");
    client.print("Content-Length: ");

    // calculate the length of the sensor reading in bytes:
    // 8 bytes for "sensor1," + number of digits of the data:
    int thisLength = 8 + getLength(thisData);

    // last pieces of the HTTP PUT request:
    client.println("Content-Type: text/csv");
    client.println("Connection: close");

    // here's the actual content of the PUT request:
  else {
    // if you couldn't make a connection:
    Serial.println("connection failed");
   // note the time that the connection was made or attempted:
  lastConnectionTime = millis();

// This method calculates the number of digits in the
// sensor reading.  Since each digit of the ASCII decimal
// representation is a byte, the number of digits equals
// the number of bytes:

int getLength(int someValue) {
  // there's at least one byte:
  int digits = 1;
  // continually divide the value by ten,
  // adding one to the digit count for each
  // time you divide, until you're at 0:
  int dividend = someValue /10;
  while (dividend > 0) {
    dividend = dividend /10;
  // return the number of digits:
  return digits;

« Last Edit: March 29, 2014, 06:18:37 pm by arusr » Logged

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The problem with tutorial code is that it is not following API specification.
instead of client.print("X-XivelyApiKey: "); it should be
   client.print("X-ApiKey: ");

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Big thanks!  This small fix worked for me!  Odd the example would have such an obvious error.   smiley-eek

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