Questions tagged [mqtt]

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1answer
160 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 '...
1
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0answers
176 views

Micropython on Esp32 MQTT

I've modified the instructions here for setting up publishing DHT-22 temperature and humidity sensor values over MQTT. I have the cheaper DHT-11 sensor instead and when I run my code in repl it works ...
1
vote
1answer
188 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://...
8
votes
1answer
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 ...
1
vote
1answer
393 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 ...
1
vote
0answers
121 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 ...
0
votes
1answer
1k 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: ...