You can run async_mqtt broker, benchmarking tool, and CLI client using docker.

See https://github.com/redboltz/async_mqtt/tree/main/docker

Preparation

git clone https://github.com/redboltz/async_mqtt.git
cd async_mqtt
cd docker

Run broker

./broker.sh

If you don’t have executing docker permission, then run as follows:

sudo ./broker.sh

Run client_cli

On another terminal:

./client_cli.sh --host host.docker.internal

If you don’t have executing docker permission, then run as follows:

sudo ./client_cli.sh --host host.docker.internal

Then, you can communicate to the broker container on the same machine.

You can subscribe and publish as follows:

cli> sub t1 1
cli> pub t1 hello 1
cli> exit

Red colored message is command response. Cyan colored message is received packet.

Also you can connect mosquitto.org as follows.

./client_cli --host test.mosquitto.rog