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[SOLVED] Error writing value to feed
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[SOLVED] Error writing value to feed

by huguescmoi on Tue Feb 02, 2016 4:30 pm

Just starting with the Adafruit IO ESP8266 Arduino example. I use the example sketch, without any modifications (except my own ssid, password, AIO key and feed name. I do not succeed to write any values to the feed.

My feed that I created to test has the following parameters:
name : poules
key: poules-temperature

Running the script gives this ouput on serial monitor:

Adafruit IO ESP8266 test!
Connecting to (masked)
WiFi connected
IP address:
Error writing value to feed!
Waiting 10 seconds and then reading the feed value.
Received value from feed:
Waiting 10 seconds and then writing a new feed value.

The script I run is (with ssid/password masked):

// Adafruit IO REST API access with ESP8266
// For use with ESP8266 Arduino from:
// Works great with ESP8266 modules like the Adafruit Huzzah ESP:
// ---->
// Written by Tony DiCola for Adafruit Industries.
// MIT license, all text above must be included in any redistribution.
#include <ESP8266WiFi.h>
#include "Adafruit_IO_Client.h"

// Configure WiFi access point details.
#define WLAN_SSID "***"
#define WLAN_PASS "***"

// Configure Adafruit IO access.
#define AIO_KEY "***"

// Create an ESP8266 WiFiClient class to connect to the AIO server.
WiFiClient client;

Adafruit_IO_Client aio = Adafruit_IO_Client(client, AIO_KEY);

Adafruit_IO_Feed testFeed = aio.getFeed("poules","poules-temperature");

// Global state to increment a number and send it to the feed.
unsigned int count = 0;

void setup() {
// Setup serial port access.
Serial.println(); Serial.println();
Serial.println(F("Adafruit IO ESP8266 test!"));

// Connect to WiFi access point.
Serial.print("Connecting to ");

while (WiFi.status() != WL_CONNECTED) {

Serial.println("WiFi connected");
Serial.println("IP address: "); Serial.println(WiFi.localIP());

// Initialize the Adafruit IO client class (not strictly necessary with the
// client class, but good practice).


void loop() {
// Increment the count value and write it to the feed.
count += 1;
// To write a value just call the feed's send function and pass it the value.
// Send will create the feed on Adafruit IO if it doesn't already exist and
// then add the value to it. Send returns a boolean that's true if it works
// and false if it fails for some reason.
if (testFeed.send(count)) {
Serial.print(F("Wrote value to feed: ")); Serial.println(count, DEC);
else {
Serial.println(F("Error writing value to feed!"));

// Now wait 10 seconds and read the current feed value.
Serial.println(F("Waiting 10 seconds and then reading the feed value."));

// To read the latest feed value call the receive function on the feed.
// The returned object will be a FeedData instance and you can check if it's
// valid (i.e. was successfully read) by calling isValid(), and then get the
// value either as a text value, or converted to an int, float, etc.
FeedData latest = testFeed.receive();
if (latest.isValid()) {
Serial.print(F("Received value from feed: ")); Serial.println(latest);
// By default the received feed data item has a string value, however you
// can use the following functions to attempt to convert it to a numeric
// value like an int or float. Each function returns a boolean that indicates
// if the conversion succeeded, and takes as a parameter by reference the
// output value.
int i;
if (latest.intValue(&i)) {
Serial.print(F("Value as an int: ")); Serial.println(i, DEC);
// Other functions that you can use include:
// latest.uintValue() (unsigned int)
// latest.longValue() (long)
// latest.ulongValue() (unsigned long)
// latest.floatValue() (float)
// latest.doubleValue() (double)
else {
Serial.print(F("Failed to receive the latest feed value!"));

// Now wait 10 more seconds and repeat.
Serial.println(F("Waiting 10 seconds and then writing a new feed value."));

What do i do wrong ? HELLP
Last edited by huguescmoi on Wed Feb 03, 2016 2:19 pm, edited 1 time in total.

Posts: 13
Joined: Sat Jan 23, 2016 12:29 pm

Re: Error writing value to feed

by huguescmoi on Wed Feb 03, 2016 2:14 pm

For memory and help others, the mistake was due to the fact that Adafruit IO does not support spaces in the name of a feed.
Should be written in BOLD LETTERS in the tutorial to avoid loosing hours of troubleshooting for something we can't make up without documentation.

Posts: 13
Joined: Sat Jan 23, 2016 12:29 pm

Please be positive and constructive with your questions and comments.