You can connect to the broker async-mqtt.redboltz.net for testing.

port protocol client_cli.sh access

1883

MQTT on TCP

./client_cli.sh --host async-mqtt.redboltz.net --port 1883 --protocol mqtt

8883

MQTT on TLS

./client_cli.sh --host async-mqtt.redboltz.net --port 8883 --protocol mqtts

10080

MQTT on Websocket

./client_cli.sh --host async-mqtt.redboltz.net --port 10080 --protocol ws

10443

MQTT on Websocket(TLS)

./client_cli.sh --host async-mqtt.redboltz.net --port 10443 --protocol wss

Important notice

You are free to use it for any application, but please do not abuse or rely upon it for anything of importance. This server runs on an very low spec vps. It is not intended to demonstrate any performance characteristics. Please don’t publish anything sensitive, anybody could be listening.