Questions tagged [mqtt]
The mqtt tag has no usage guidance.
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Setting MQTT subscriber sleep intervals via periodic broadcasting
I have a system that consists of several field units which periodically (every 10 minutes) wake up and publish data to a MQTT topic. I am hosting the MQTT broker myself on a Linux server.
I would like ...
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Using TINYGSM Client write function for PubSub's client.publish()
I have an application of data logger done on ESP32 where a JSON string is published to the MQTT server(QOS 0) using PubSub Library via TINYGSM. I am attaching a sample of the packet sent to the MQTT ...
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Connect Fona3G SIM5320 to cloud over MQTT protocol using GPRS/TCP with stm32
I am seeking assistance in connecting the FONA 3G SIM5320 module to the cloud via TCP connect to establish an MQTT connection. I have successfully connected the module using GPRS connectivity by ...
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Connect 100 ESP8266 WiFi modules to a master (Raspberry Pi Pico W)
I am looking for the most efficient solution for transferring data from ~100 individual ESP8266 WiFi modules, that have sensors connected to them, to my Raspberry Pi Pico W.
This will be used for a ...
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Send data to MQTT broker using SIM800 and ESP32
I'm working on a project in which I need to send data to an MQTT broker installed on a Raspberry Pi.
I refer to the tinyGSM library and this tutorial along with this example.
The ESP32 remains in ...
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Access meter readings remotely
I am not an expert on interfaces and communication protocols and I am trying to get data from several meters to read it remotely. The meters have an M-Bus interface to a Data-Logger. The Data-Logger ...
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Bridge Local Mosquitto MQTT broker installed on RPi with cloud MQTT broker
I was trying creating a bridge between the cloud broker (io.adafruit) and mosquitto broker which runs on my Raspberry Pi.
I have successfully tested the local mqtt connection whereas connecting to a ...
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Connect HC-05 and esp8266 with MQTT protocol
I trying to use Bluetooth HC-05 with esp8266 to connect with Mqtt broker (Raspberry Pi), I already know how to connect by Wi-Fi, because there are a lot of example code for it. But not for Bluetooth.
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343
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3V3 relay control with ESP-01
I am working on a simple circuit whose goal is to control a high voltage device (e.g. a lamp) thanks to a (3V3) relay module, ESP8266-01 and the MQTT protocol.
To power this circuit, I am using a 5V ...
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MQTT between ESP32 and Raspberry pi running Mosquitto Broker
I have been trying to connect them but it seems like the MQTT connection is not working. That is the only part that is not, I followed this tutorial (https://www.instructables.com/id/How-to-Use-MQTT-...
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MQTT Broker vs Server
I am trying to learn MQTT technology. What I understand so far, is that MQTT is based on a 'Broker' that does the 'Publish and Subscribe' of messages and topics. I wonder if it's another name for '...
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Relay model for controlling the Air Conditioner power supply
I am trying to control my Air conditioner via MQTT protocol. I just want to make the power on and off. How can I calculate the relay current rating for 1126 Watts of power?
Link to AC model: https://...
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Lowest latency out of the 802.11 Wi-Fi standards
I'm making a project using an Arduino and an ESP8266 module running the esp-link firmware - which gives me the ability to use MQTT for controlling the Arduino. I'd looked at something like an XBee ...
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Is there a common message protocol for sensor data on top of MQTT-SN?
I want to communicate various sensor data in a network of sensors.
I found MQTT and MQTT-SN as suitable protocols for that. The latter being better suited for sensor networks with support for ...
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MQTT subscription issue: The length of my received packet is always 19 characters
This is my first post here so bear with me if I accidentally didn't follow conventional standards here. Here's the issue:
I am using a teensy 3.2 and WINC1500 wifi breakout to play around with MQTT ...
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MQTT + ESP8266-01 and AVR [closed]
I'm working in the IoT field and just got started with the WiFi module ESP8266-01. I know how to use the AT comands and HTTP requests, but I want to use MQTT protocol.
I have found this library: ...
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