| Server | Broker | Port | Websocket | TLS |
| iot.eclipse.org | Mosquitto | 1883 / 8883 | n/a | n/a |
| broker.hivemq.com | HiveMQ | 1883 | 8000 | n/a |
| test.mosquitto.org | Mosquitto | 1883 / 8883 / 8884 | 8080 / 8081 | n/a |
| test.mosca.io | mosca | 1883 | 80 | n/a |
| broker.mqttdashboard.com | HiveMQ | 1883 | n/a | |
| mqtt.flespi.io | flespi | 1883 | 80 | n/a |
| mqtt.swifitch.cz | mosquitto | 1883 | — | n/a |
| mqtt.fluux.io | ejabberd | 1883 | — | 8883 |
MQTT websocket-client