dockerfiles/mosquitto

mosquitto

Mosquitto is an open source (BSD licensed) message broker that implements the MQTT protocol versions 3.1 and 3.1.1.

server

Sample config file: mosquitto.conf

• pwfile is managed by mosquitto_passwd.
• Two methods to support TLS:
  • You can get free TLS certificates from letsencrypt, capath is needed.
  • Self-signed TLS keys can be generated by openssl, cafile is needed.

It is important to use different certificate subject parameters for your self-signed CA, server and clients.

$ mkdir -p data/{etc,var,log}
$ chmod -R 777 data
$ touch data/etc/mosquitto.conf data/etc/pwfile
$ vi data/etc/mosquitto.conf
$ docker-compose up -d
$ docker-compose exec mosquitto sh
>>> cd /etc/mosquitto
>>> mosquitto_passwd -b pwfile username password
>>> cat pwfile
username:$6$IuF7JUzS1k/QoF3y$YpiClom7/==
>>> exit
$ docker-compose kill -s SIGHUP
$ tails -f data/log/mosquitto.log
2022-12-08T06:59:00: mosquitto version 1.4.8 (build date 2016-05-16 14:17:19+0000) starting
2022-12-08T06:59:01: Config loaded from /etc/mosquitto/mosquitto.conf.
2022-12-08T06:59:02: Opening ipv4 listen socket on port 8883.
2022-12-08T06:59:03: Opening ipv6 listen socket on port 8883.
2022-12-08T06:59:04: New connection from 192.168.31.102 on port 8883.
2022-12-08T06:59:05: New client connected from 192.168.31.102 as mosqsub/38158-Kevins-Ma (c1, k60).
2022-12-08T06:59:06: New client connected from 192.168.31.102 as mosqpub/38324-Kevins-Ma (c1, k60).
2022-12-08T06:59:07: Client mosqpub/38324-Kevins-Ma disconnected.

client

$ mosquitto_sub -d -h 192.168.31.231 -p 8883 --cafile ca.crt --insecure -u username -P password -t hello
Client mosqsub/38158-Kevins-Ma sending CONNECT
Client mosqsub/38158-Kevins-Ma received CONNACK
Client mosqsub/38158-Kevins-Ma sending SUBSCRIBE (Mid: 1, Topic: hello, QoS: 0)
Client mosqsub/38158-Kevins-Ma received SUBACK
Subscribed (mid: 1): 0
Client mosqsub/38158-Kevins-Ma sending PINGREQ
Client mosqsub/38158-Kevins-Ma received PINGRESP
received PUBLISH (d0, q0, r0, m0, 'hello', ... (5 bytes))
world
Client mosqsub/38158-Kevins-Ma sending PINGREQ
Client mosqsub/38158-Kevins-Ma received PINGRESP

$ mosquitto_pub -d -h 192.168.31.231 -p 8883 --cafile ca.crt --insecure -u username -P password -t hello -m world
Client mosqpub/38324-Kevins-Ma sending CONNECT
Client mosqpub/38324-Kevins-Ma received CONNACK
Client mosqpub/38324-Kevins-Ma sending PUBLISH (d0, q0, r0, m1, 'hello', ... (5 bytes))
Client mosqpub/38324-Kevins-Ma sending DISCONNECT