内容简介：MQTT是一套标准，常用的服务端有Eclipse的Mosquitto。MQTT是IBM出品，Eclipse也是IBM出品，所以Mosquitto算是官方实现吧。执行命令启动:
MQTT是一套标准，常用的服务端有Eclipse的Mosquitto。MQTT是IBM出品，Eclipse也是IBM出品，所以Mosquitto算是官方实现吧。
Mosquitto在macOS下的安装
执行命令 brew install mosquitto
即可安装
启动:
-
理论上
brew services start mosquitto可以启动，但是我这边启动不了，也找不到报错信息和相关日志。所以放弃 -
手动启动:
/usr/local/opt/mosquitto/sbin/mosquitto -c /usr/local/etc/mosquitto/mosquitto.conf -v以Verbose模式阻塞式启动。也可以不使用-c选项，用默认配置启动Mosquitto
Mosquitto启动日志:
1543540708: mosquitto version 1.5.4 starting 1543540708: Config loaded from /usr/local/etc/mosquitto/mosquitto.conf. 1543540708: Opening ipv6 listen socket on port 1883. 1543540708: Opening ipv4 listen socket on port 1883.
可见Mosquitto默认监听1883端口
MQTT演示
MQTT是一套消息订阅与发布协议，这里我启动一个客户端订阅与监听 animal
主题，然后用另一个客户端向 animal
主题发送消息。控制台输出如下如下:
消息发布端
$ mosquitto_pub --topic animal --message "ant"
$ mosquitto_pub --topic animal --message "bee"
消息发布端没有控制台输出，发布消息后直接退出
消息订阅端
$ mosquitto_sub --topic animal
ant bee
服务端
1543542192: New connection from ::1 on port 1883. 1543542192: New client connected from ::1 as mosqsub|73254-MacBook-A (c1, k60). 1543542192: No will message specified. 1543542192: Sending CONNACK to mosqsub|73254-MacBook-A (0, 0) 1543542192: Received SUBSCRIBE from mosqsub|73254-MacBook-A 1543542192: animal (QoS 0) 1543542192: mosqsub|73254-MacBook-A 0 animal 1543542192: Sending SUBACK to mosqsub|73254-MacBook-A 1543542215: New connection from ::1 on port 1883. 1543542215: New client connected from ::1 as mosqpub|73257-MacBook-A (c1, k60). 1543542215: No will message specified. 1543542215: Sending CONNACK to mosqpub|73257-MacBook-A (0, 0) 1543542215: Received PUBLISH from mosqpub|73257-MacBook-A (d0, q0, r0, m0, 'animal', ... (3 bytes)) 1543542215: Sending PUBLISH to mosqsub|73254-MacBook-A (d0, q0, r0, m0, 'animal', ... (3 bytes)) 1543542215: Received DISCONNECT from mosqpub|73257-MacBook-A 1543542215: Client mosqpub|73257-MacBook-A disconnected. 1543542233: New connection from ::1 on port 1883. 1543542233: New client connected from ::1 as mosqpub|73267-MacBook-A (c1, k60). 1543542233: No will message specified. 1543542233: Sending CONNACK to mosqpub|73267-MacBook-A (0, 0) 1543542233: Received PUBLISH from mosqpub|73267-MacBook-A (d0, q0, r0, m0, 'animal', ... (3 bytes)) 1543542233: Sending PUBLISH to mosqsub|73254-MacBook-A (d0, q0, r0, m0, 'animal', ... (3 bytes)) 1543542233: Received DISCONNECT from mosqpub|73267-MacBook-A 1543542233: Client mosqpub|73267-MacBook-A disconnected.
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