How to share topics between two protocols in mosquitto

Question

I am using mosquitto mqtt both with MQTT protocol and MQTT over websockets protocol. Some client use mqtt protocol and some uses websocket protocol due to their limitations. MQTT port is 1883 and websocket port is 8083. The problem is that I want to share all the topics on both port i.e. on websocket and MQTT. What type of configurations i should do in my MQTT broker or any other solution?

In other words I want to listen to all topics on websocket(port 8083) which are published on mqtt(port 1883) on same broker and vise versa.

mosquitto.conf file is following

allow_anonymous false
password_file /etc/mosquitto/passwd

listener 8083 127.0.0.1
protocol websockets

That config file only has a websocket listener, where is the native MQTT listener? — hardillb

hardillb hardillb · Accepted Answer · 2018-02-08T12:56:37

You don't have to change anything.

There is only one topic space shared across all listeners/protocols with mosquitto.

The following mosquitto.conf works:

port 1883

listener 8083
protocol websockets

Used with the following nodejs app to test websockets:

var mqtt = require('mqtt')
var client  = mqtt.connect('ws://localhost:8083')

client.on('connect', function () {
  client.subscribe('#')
  client.publish('presence', 'Hello mqtt')
})

client.on('message', function (topic, message) {
  // message is Buffer
  console.log("%s - %s", topic, message.toString())
})

and native MQTT messages injected with mosquitto_pub -t "foo" -m "bar" and monitored with mosquitto_sub -v -t '#'

Whole thing running mosquitto v1.4.14 (from the mosquitto ppa) on Ubuntu 16.04

How to share topics between two protocols in mosquitto

1 Answers