パブリック MQTT ブローカーの使い方

次のブローカーを使ってみました。
Free Public MQTT 5 Broker Server

MQTT

publish

go_pub_mqtt.sh

message="Hello Mqtt "`date`
mosquitto_pub -d -t orz -m "${message}" \
	-h  broker.emqx.io \
	--topic example/testTopic

subscribe

go_sub_mqtt.sh

mosquitto_sub -d -t orz -h broker.emqx.io \
    --topic example/testTopic

実行結果

$ mosquitto_sub -d -t orz -h broker.emqx.io --topic example/testTopic
Client (null) sending CONNECT
Client (null) received CONNACK (0)
Client (null) sending SUBSCRIBE (Mid: 1, Topic: orz, QoS: 0, Options: 0x00)
Client (null) sending SUBSCRIBE (Mid: 1, Topic: example/testTopic, QoS: 0, Options: 0x00)
Client (null) received SUBACK
Subscribed (mid: 1): 0, 0
Client (null) received PUBLISH (d0, q0, r0, m0, 'example/testTopic', ... (53 bytes))
Hello Mqtt 2021年  8月 10日 火曜日 18:39:44 JST
Client (null) sending PINGREQ
Client (null) received PINGRESP
Client (null) received PUBLISH (d0, q0, r0, m0, 'example/testTopic', ... (53 bytes))
Hello Mqtt 2021年  8月 10日 火曜日 18:40:12 JST

MQTTS

publish

go_pub_mqtts.sh

message="Hello Mqtt "`date`
mosquitto_pub -d -t orz -m "${message}" \
	-h  broker.emqx.io \
	 -p 8883 --capath /etc/ssl/certs/ \
	--topic example/testTopic

subscribe

go_sub_mqtts.sh

mosquitto_sub -d -t orz -h broker.emqx.io \
	 -p 8883 --capath /etc/ssl/certs/ \
    --topic example/testTopic

確認したバージョン

$ mosquitto_pub --version
mosquitto_pub version 2.0.18 running on libmosquitto 2.0.18.

$ mosquitto_sub --version
mosquitto_sub version 2.0.18 running on libmosquitto 2.0.18.