Duplicate messages received by Adafruit MQTT Library and ESP8266

[adafruit]

Duplicate messages received by Adafruit MQTT Library and ESP8266

[tdicola]

Hrm I can't repro this with the mosquitto test server (http://test.mosquitto.org/). Here's the auth configuration I was using for the sketch:

/************************* Adafruit.io Setup *********************************/

#define AIO_SERVER      "test.mosquitto.org"
#define AIO_SERVERPORT  1883
#define AIO_USERNAME    ""
#define AIO_KEY         ""

And the feed config (slight change to add my name/a unique value to the front of the feed so nothing conflicts with it on the test server):

// Setup a feed called 'photocell' for publishing.
// Notice MQTT paths for AIO follow the form: <username>/feeds/<feedname>
const char PHOTOCELL_FEED[] PROGMEM = AIO_USERNAME "tdicola/feeds/photocell";
Adafruit_MQTT_Publish photocell = Adafruit_MQTT_Publish(&mqtt, PHOTOCELL_FEED);

// Setup a feed called 'onoff' for subscribing to changes.
const char ONOFF_FEED[] PROGMEM = AIO_USERNAME "tdicola/feeds/onoff";
Adafruit_MQTT_Subscribe onoffbutton = Adafruit_MQTT_Subscribe(&mqtt, ONOFF_FEED);

I let it connect to the mosquitto test server, then using this Paho MQTT python library (https://pypi.python.org/pypi/paho-mqtt) code on another machine I published a message to the 'tdicola/feeds/onoff' feed that the sketch is listening to. Here's the code I was using:

import paho.mqtt.publish as publish
publish.single('tdicola/feeds/onoff', payload='ON', hostname='test.mosquitto.org', port=1883)
print 'Sent message!'

In the serial output I only see one message received:

Sending photocell val 249...OK!
Got: ON

Sending photocell val 250...OK!

I'm curious how are you publishing messages when testing on other brokers--could it be sending two messages?

For Adafruit IO specifically though it does look like right now one change, like pressing a toggle switch on a dashboard, can generate two events. It's something being looked at to simplify and only generate one message, but for now there could be duplicates since it's QOS 0.

For other brokers though if you send one message and receive two responses with the library it does seem unexpected. Let me know if you have more details on a repro example and I can try it too. Thanks!

[toddtreece]

the duplicate message issue was fixed with io.adafruit.com, so i'm going to close this one