Testing three different MQTT brokers: mosquitto, hbmqtt (python) and volantmq (go). The goal is to compare different brokers using the same client code. In particular, I wanted to know if the main python and golang broker implementations support QOS level 2 subscriptions. i.e. whether the broker will store undelivered messages while the subscriber is offline, and deliver them once it comes online.

The compose file sets up the three brokers, and two clients (a producer and a consumer).

Setup

Before you launch the clients, launch the brokers you want to try with compose. This will launch the three brokers:

docker-compose up mosquitto pybroker gobroker

Clients

The clients can be configured to use different brokers with the MQTT_HOST environment variable (see below). You can run as many clients as you wish.

Mosquitto

docker-compose run -e MQTT_HOST=mosquitto consumer

docker-compose run -e MQTT_HOST=mosquitto producer

HBMQTT (python)

This broker is using BoltDB (an embedded key-value store) for persistence.

docker-compose run -e MQTT_HOST=pybroker consumer

docker-compose run -e MQTT_HOST=pybroker producer

VolantMQ (Go)

docker-compose run -e MQTT_HOST=gobroker consumer

docker-compose run -e MQTT_HOST=gobroker producer