mqtt dat

arduino library

• async-mqtt-client-master

• PubSubClient

  • https://github.com/knolleary/pubsubclient
  • examples/mqtt_esp8266.ino

• radiolib

MQTT broker on ubuntu

sudo apt install -y mosquitto

sudo systemctl status mosquitto

• Stop the mosquitto service:
  • $ sudo systemctl stop mosquitto
• Start the mosquitto service:
  • $ sudo systemctl start mosquitto
• Restart the mosquitto service:
  • $ sudo systemctl restart mosquitto

Log file

• cat /var/log/mosquitto/mosquitto.log

Conf Setup list

allow_anonymous false // not allow anonymous password_file /etc/mosquitto/passwd // set password

listener 1883 // set port 1883 public, or listener 1883 localhost for localhost only

listener 1884 // set 1884 for wss protocol websockets

MQTT client

sudo apt install -y mosquitto-clients

sub: mosquitto_sub -t "test"

pub: mosquitto_pub -m "ON" -t "test"

A number of my IoT students make use of (the FREE plan with) BeeBotte for their remote MQTT broker.

https://beebotte.com/ It's very easy to set up and works really well with Nod-RED.

web test

• https://www.emqx.io/mqtt/mqtt-websocket-toolkit