##test.mosquitto.org
| port | Usage | ---- | _____ | | 1883 | MQTT, unencrypted | | 8883 | MQTT, encrypted | | 8884 | MQTT, encrypted, client certificate required | | 8887 | MQTT, encrypted, server certificate deliberately expired | | 8080 | MQTT over WebSockets, unencrypted | | 8081 | MQTT over WebSockets, encrypted |
| port | Usage | ---- | _____ | | 1883 | MQTT, unencrypted | | 8883 | MQTT, encrypted | | 8083 | MQTT over WebSockets, unencrypted | | 8084 | MQTT over WebSockets encrypted |
| port | Usage | ---- | _____ | | 1883 | MQTT, unencrypted | | 8000 | MQTT over WebSockets, unencrypted |