MQTTGO
Server: mqttgo.io
TCP Port: 1883 / 8883(TLS)
WebsocketPort: 8000

ESP32 (C語言MQTT函式庫)
mqttgo.io
1883 (http)
8883 (https)

MQTT.js (JavaScript MQTT函式庫)
ws://mqttgo.io:8000/mqtt
wss://broker.mqttgo.io:8084/mqtt



HiveMQ
Server: broker.hivemq.com
TCP Port: 1883
WebsocketPort: 8000

ESP32 (C語言MQTT函式庫)
broker.hivemq.com
1883 (http)

MQTT.js (JavaScript MQTT函式庫)
ws://broker.hivemq.com:8000/mqtt
wss://broker.hivemq.com:8884/mqtt



Mosquitto
Server: test.mosquitto.org
TCP Port: 1883 / 8883(TLS)
WebsocketPort: 8080 / 8081(TLS)

ESP32 (C語言MQTT函式庫)
test.mosquitto.org
1883 (http)
8883 (https)

MQTT.js (JavaScript MQTT函式庫)
ws://test.mosquitto.org:8080/mqtt
wss://test.mosquitto.org:8081/mqtt



EMQX
Server: broker.emqx.io
TCP Port: 1883 / 8883(TLS)
WebsocketPort: 8083 / 8084(TLS)

ESP32 (C語言MQTT函式庫)
broker.emqx.io
1883 (http)
8883 (https)

MQTT.js (JavaScript MQTT函式庫)
ws://broker.emqx.io:8083/mqtt
wss://broker.emqx.io:8084/mqtt