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Questions tagged [mqtt]

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GSM and LTE-M connection with SIM7070G for MQTT data transmission

I am working on a tracker project using the SIM7070G modem from SIMCOM. The objective is to maximize the connection by working with both LTE-M and GSM, aiming to send location data via MQTT. I have ...
Santiago Mercante's user avatar
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0 answers
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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 ...
Microcontroller Enjoyer's user avatar
0 votes
1 answer
171 views

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 ...
drew wood's user avatar
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1 vote
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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 ...
Laila Elkaddar's user avatar
-1 votes
1 answer
69 views

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 ...
Karen Semmler's user avatar
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0 answers
220 views

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 ...
Rahul S Saksule's user avatar
1 vote
1 answer
303 views

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. ...
Anime Lover's user avatar
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0 answers
420 views

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 ...
floflo29's user avatar
  • 111
0 votes
1 answer
737 views

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-...
Ish Montalvo's user avatar
3 votes
1 answer
2k views

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 '...
scico111's user avatar
  • 907
1 vote
1 answer
452 views

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://...
atluri bhanu chander's user avatar
8 votes
1 answer
2k views

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 ...
seanlano's user avatar
  • 183
1 vote
1 answer
516 views

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 ...
cross's user avatar
  • 51
1 vote
0 answers
167 views

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 ...
byahya's user avatar
  • 11
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1 answer
2k views

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: ...
Lông Nguyễn's user avatar