MQTT大杂烩

栏目: 后端 · 发布时间: 5年前

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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