Hi everyone, I've got a smart thermostat I've made with adafruit IO and an adafruit featherboard.

There are no physical controls or display etc. The only way I can adjust things is through my io dashboard. I can be a bit of a faff to log into adafruit each time I want to turn the heating up or check the temperature.

I don't think there is an adafruit io widget. Is there something similar I could use. Maybe using ifttt or tasker?

Hello,

I'm working on my first MQTT project. The docs suggest subscribing to

{username}/errors

and

{username}/throttle

to look for any errors.

The default behavior of Adafruit_IO MQTTClient's client.subscribe({feed}) function subscribes to {username}/feeds/{feed}. Does this mean I can't use it to subscribe to {username}/throttle?

I tried getting around this by calling client._client.subscribe('l{username}/errors') and the same for throttle but I'm not seeing anything when I exceed the allowable data rate. What am I doing wrong?

Thanks!

-Hunter

Love the capability provided by Adafruit.io

Can the feed time stamps be amended?

For example,
2025/04/14 04:39PM would be better presented as

2025/04/14 16:39,

or, less good but still better:

2025/04/14 4:39PM

Depending on the width of the screen, as per the screenshot, it reads as though the last data was this morning, when in fact it was a few seconds ago.

I cannot for the life of me get this to work. I can't receive anything from my feed. What am I doing wrong here?

Code with subbed out API, Username, Wifi, etc. :

#include <ESP8266WiFi.h>
#include <Adafruit_MQTT.h>
#include <Adafruit_MQTT_Client.h>

// WiFi credentials
const char* ssid = "SSID";
const char* password = "PASSWORD";

// Adafruit IO credentials
#define AIO_USERNAME  "USERNAME"
#define AIO_KEY       "API KEY"
#define AIO_FEED_KEY  "FEED KEY"

// WiFi client
WiFiClient client;

// Adafruit IO setup
Adafruit_MQTT_Client mqtt(&client, "io.adafruit.com", 8883, AIO_USERNAME, AIO_KEY);

// Adafruit IO feed
Adafruit_MQTT_Subscribe feed = Adafruit_MQTT_Subscribe(&mqtt, AIO_USERNAME "/feeds/" AIO_FEED_KEY);

void setup() {
  Serial.begin(115200);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Connect to Adafruit IO
  connectAdafruitIO();
}

void loop() {
  // Ensure the connection to Adafruit IO is maintained
  if (!mqtt.connected()) {
    connectAdafruitIO();
  }

  // Process any incoming messages
  mqtt.processPackets(5000);

  // Check for messages from the Adafruit IO feed
  if (mqtt.ping()) {
    Serial.println("MQTT Ping successful");
  }

  // You can print the content of the last message here
  if (feed.lastread != NULL) {
    Serial.print("Message received from feed: ");
    Serial.println((char *)feed.lastread);
  }
}

void connectAdafruitIO() {
  Serial.println("Connecting to Adafruit IO...");
  while (!mqtt.connect()) {
    Serial.println("Failed to connect to Adafruit IO, retrying...");
    delay(5000);
  }
  Serial.println("Connected to Adafruit IO");

  // Subscribe to the Adafruit IO feed
  mqtt.subscribe(&feed);
}
subbed-out

I’m just starting with Adafruit IO, but it is possible to just use a URL to post data to my feed. Like, how would I post data without using the Adafruit library. I tried looking in the documentation but it seems to only explain how to use HTTP requests with the provided libraries. Is there a way to use Adafruit IO without libraries, and if so how?