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MQTT (Message Queuing Telemetry Transport) is a machine-to-machine (M2M)/"Internet of Things" connectivity protocol. The MQTT protocol enables a publish/subscribe messaging model in an extremely lightweight way. It is useful for connections with remote locations where a small code footprint is required and/or network bandwidth is at a premium.

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I have an issue when trying to upload sensor data to ThingSpeak using the GSMSSLClient with the Arduino MKR GSM 1400 over MQTT. Each time I attempt to establish an MQTT connection, the state is always ...
arnold7800x3D's user avatar
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On my ESP32 I am trying to connect to my HomeAssistant server using ArduinoHA library. I can easily connect when hard-coding the credentials: mqtt.begin("server", "username", "...
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I have a SAMD51P20 based Arduino PLC with WIZnet W5500 based Ethernet shield. I'm using these libraries: #include <Ethernet.h> #include <MQTT.h> #include <ArduinoModbus.h> MQTT and ...
Paul Jurczak's user avatar
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I am wondering if there is a way to check and see if the MQTT connection is still active. The reason for this is that I am having trouble with the connection dropping after a short while and not ...
Kody Rogers's user avatar
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I may have done some things incorrectly here, but this I what I have for publishing image that I read from serial camera to the MQTT broker: void capturePicture() { if (!cam.takePicture()) ...
greengold's user avatar
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I am wrestling with the below example. I have a RasPi on the network running Mosquito with username and password credentials setup and I know this is working. If I load the below example, I can ...
little-rich's user avatar
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I use GPIO 5 to trigger a relay. My code also connects with a secure MQTT connection for which I have to use the BearSSL certificate definitions. Without the BearSSL certificates, when the ESP ...
Shreyansh Jain's user avatar
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I cannot connect to a MQTT broker from a NodeMCU, when using SSL. This is the error message: Attempting MQTT connection...failed, rc=-4 try again in 5 seconds. When connecting to the same broker via ...
Nicht Oeffentlich's user avatar
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I have a program that communicate between a esp8266 and a atmega328 using Serial, the esp8266 will connect to a MQTT server running on local network, and publish/subscribe to some topics. In the ...
J. C. Stark's user avatar
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Issue (short) description An ESP8266 using PubSubClient fails to establish connection to MQTT broker (mosquitto) if requesting Last Will Testament (LWT) on connection, though it is able to connect ...
Vadim's user avatar
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I'm using aedes as my custom MQTT broker and PubSubClient at the ESP32 side, together with the ArduinoJSON package. My server test code: import Aedes from "aedes"; import net from "net&...
Mendes's user avatar
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Using M5StickC ESP32 with built-in MPU6886 accelerometer to read vibrations. In the loop() section the code gets 10 readings per second and if the readings exceed a threshold, it starts publishing the ...
febalci's user avatar
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I am getting a json object from aws iot MQTT. Assuming that json from aws is {status:opened}. Here is my code. #include <ArduinoJson.h> void messageHandler(char *topic, byte *payload, unsigned ...
Jess's user avatar
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I have an Arduino Mega with Ethernet connected to a router by cable. Also I have a PC connected to the router (by Wifi) where also the local MQTT broker is installed (mosquitto). Althought the Arduino ...
bardulia's user avatar
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Problem description: Every ~20+ published messages (using terminal), MCU receives that message in a very noticeable delay (mostly ~10 sec, few time it got up to 1 min). Upon receive (printed in Serial ...
guyd's user avatar
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I'm wondering if an Arduino Uno (or any other 328 family) that connects via Serial to an ESP8266 can send MQTT messages, rather than AT commands.
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I am trying to connect to AWS IoT through the Arduino Portenta H7 and I am following this blog (https://create.arduino.cc/projecthub/Arduino_Genuino/securely-connecting-an-arduino-mkr-wifi-1010-to-aws-...
Electric Dragon's user avatar
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I'm using PubSubClient to pub/sub MQTT messages using ESP8266. As far as I know "Keep-alive" detects when a client went off-line after a period of time. I'm using library's example ...
guyd's user avatar
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Has anyone here ever used a ESP32 CAM to send an image via MQTT? I'd like to know what are the parameters to initialize the camera with (resolution, jpeg quality, etc.), because once I receive the ...
Johnny boy's user avatar
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Scenario: Existing project: read soft serial then do http post New project: MQTT player from other (MrDIY / MrDIY Audio Notifier · GitLab) Objective: Combine together (Result: successful ) Issue: When ...
Rex's user avatar
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I am trying to use a Adafruit Sim800H to connect to Azure using MQTT with an SSL certificate. My first step is trying to put a new SSL certificate onto the board. To do this I am using this example ...
Andrew's user avatar
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I am trying to retrieve JSON mqtt message I received in ESP32. void mqttMsgCallback(char* topic, byte* payload, unsigned int length) { payload[length] = '\0'; String _message = String((char*)...
Abhishek bhatia's user avatar
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Before starting working, I am just researching around how can I achieve OTA over MQTT in ESP32 in using Arduino IDE. The process I understand the esp listen to MQTT messages and then received that ...
Abhishek bhatia's user avatar
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I would like to use a BLE temperature sensor (such as the Inkbird IBS-TH1 Mini BLE Sensor), however, I want to be able to display the temperature measurements in my own website. To do this I am ...
Nina's user avatar
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I'm trying to connect an Arduino Nano 33 to an mqtt broker with TLS authenticaton on the broker side. To do that I need my Arduino board to have access to the the root certificate. My understanding is ...
RR_28023's user avatar
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I have 3 nodemcu's(ESP32) each connected with a sensor, from which I get data and send it to aws IoT-core. How can I send all 3 sensor's data by a single MQTT subscription? The below code is for a ...
Shridatha Hegde's user avatar
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3 votes
1 answer
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For a project I am working on, I need to connect my ESP32 board to another server via MQTT protocol. I am using the Mosquitto MQTT Broker and it is presently on my laptop. Following is the test code I ...
P_K's user avatar
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1 vote
1 answer
880 views

I'm making a NodeMCU based home automation. I adapted code I found on internet for controlling a device (say LED) via MQTT broker hosted on a Raspberry Pi. It works fine. But when I try to scale it up ...
coldbreeze16's user avatar
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1 answer
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I have the following code designed to allow me to control my device from my website using mqtt broker while internet is available. I also built in a local webserver to control the device in case of ...
ASH's user avatar
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1 answer
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I have mosquitto MQTT installed on my VPS server which I can subscribe and publish to it using paho client thorugh websockets. However when I tried to connect to it through Arduino, I get the ...
motion channel's user avatar
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I am using an ESP32 (https://heltec.org/project/wifi-kit-32/) with a AM2302 DHT22 and an LDR, talking to mosquitto on a Linux box. Publishing data is working fine, other than the "exceeded ...
dj_segfault's user avatar
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I want to use hiveMQ public broker in my project that's the same broker as what available in PubSubClient esp8266 examples but when I change WiFi SSID and password in example and upload it I got this ...
radinParsaei's user avatar
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I tried to send random data to MQTT but it's not working and I get: { "m2m:rsp" : { "rsc" : 4004, "rqi" : "123456", "pc" : "Resource not found", "to" : "5a185cedc6ad749b:...
daffa faiz's user avatar
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2 votes
1 answer
225 views

I am trying to publish MPU 9250 readings in the Adafruit IO sending the data from ESP32. The WiFi connection is being established, but the code is not going inside the if(mqtt.connected()) inside the ...
Ajay Raj's user avatar
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-1 votes
1 answer
478 views

I'm currently in a planning phase for a project. I want to read some sensor data over Modbus TCP, do some simple calculations on the Arduino and publish the results over MQTT. Which means I have 2 RJ-...
Jakube's user avatar
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567 views

I made a pool monitor with ORP + pH + temp sensor. I had everything working (apart from ORP sensor causing interference with pH sensor, but that is a different topic...) for the past couple days in a ...
edge360's user avatar
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1 vote
1 answer
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I'm using an ESP32, and I want to rule out a probable MQTT error. In PubSubClient , MQTT_MAX_PACKET_SIZE is set to 256. Is 256 the size for message only ? if not, what is left for message only ?
guyd's user avatar
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hi im using at tiny 85 to monitor dc switches and to serial print with this code below to esp8266 with local broker to turn leds on and off but its only working through mqtt but not with physical ...
Dharani Sharma's user avatar
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0 votes
1 answer
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I wish to combine into a single library Wifi + MQTT, for a multi devices project. right after boot, getting Wifi - I get an error the moment MQTT server is trying to connect: mqttClient.connect(...
guyd's user avatar
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0 votes
2 answers
453 views

I'm trying to write the payload of a MQTT message into a file in the SPIFFS file system of my esp32 board. I've tried this: if(file.print((long)payload)) { Serial.println("File was written"); }...
Johnny's user avatar
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/* Basic ESP8266 MQTT example This sketch demonstrates the capabilities of the pubsub library in combination with the ESP8266 board/library. It connects to an MQTT server then: - ...
sepehr's user avatar
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1 answer
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I am trying to publish json object into string with following snippet JSONVar data; data["chipid"] = chipId; data["co2_equivalent"] = co2_equivalent.c_str(); data["tvoc"] = tvoc.c_str(); data["...
rp346's user avatar
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4 votes
2 answers
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I have ESP8266 which is connecting to MQTT broker and it is working ok using user+pass with following code: #include <ESP8266WiFi.h> #include <PubSubClient.h> const char* ssid = "...
iWizard's user avatar
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I am working on a project to run some (relays or LED's) on an inputs (Pins) Arduino by esp8266-01s . now while searching on internet I found a video divided it two step that talks about the issue ...
Khalid Abu-Khadija's user avatar
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2 answers
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I want to publish image capture through ESP32-CAM to MQTT. Have following code : #include "WiFi.h" #include "esp_camera.h" #include "esp_timer.h" #include "img_converters.h" #include "Arduino.h" #...
rp346's user avatar
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I am trying to set up an Arduino MKR Wifi 1010 to push MQTT messages to AWS IOT. I am following this tutorial https://create.arduino.cc/projecthub/Arduino_Genuino/securely-connecting-an-arduino-mkr-...
simon's user avatar
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1 answer
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I am planning to build a network with five Arduino Mega devices, each of which will collect data using multiple sensors. Each Arduino will periodically transmit the sensor data to a gateway Raspberry ...
Adnan Ali's user avatar
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I have this code running on ESP32 connected to SVM30-J #include <WiFi.h> #include <PubSubClient.h> #include <Arduino_JSON.h> #include <svm30.h> // Replace the next variables ...
rp346's user avatar
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seems I have some issues in my code as I subscribe for specific mqtt topic and also read same value via serial and publish it to mqtt. It takes time for device connected to serial to change setting ...
Vaikis2006's user avatar
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1 answer
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Bit of a noob here. Im trying to use the sensor number (float) in my mqtt topic, but cant seem to get this right. Any help would be appreciated. Keep getting this error (cast from 'char*' to 'char' ...
Pieter Janse van Rensburg's user avatar
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