Mosquitto

Mosquitto is a simple MQTT message broker.

It is easiest to install via docker compose:

services:
  mosquitto:
    container_name: mosquitto
    image: eclipse-mosquitto
    restart: unless-stopped
    volumes:
      - ./data:/mosquitto/data
      - ./config:/mosquitto/config
      - ./log:/mosquitto/log
    ports:
      - 1883:1883/tcp
      - 1883:1883/udp
      - 9001:9001

Adding a user

Adding a user should be done through the container’s shell. Once there (sh, not bash):

$ cd /mosquitto/config
$ mosquitto_passwd mosquitto.passwd {username}

Avoid common mistake

Do NOT use the -c flag with mosquitto_passwd! This wipes existing entries in the password file (it’s the “create new file” button).