MQTT 入门手册
EMQ - 全球领先的开源物联网数据基础设施软件供应商
目录
序言 ................................................................................................................................................................. 1
初识 MQTT....................................................................................................................................................2
MQTT 发布/订阅模式介绍 ............................................................................................................................8
创建 MQTT 连接..........................................................................................................................................11
MQTT 主题与通配符 ....................................................................................................................................16
持久会话 .......................................................................................................................................................22
QoS 0, 1, 2...................................................................................................................................................29
遗嘱消息 .......................................................................................................................................................38
Keep Alive................................................................................................................................................... 43
保留消息 .......................................................................................................................................................47
请求/响应.....................................................................................................................................................56
用户属性 .......................................................................................................................................................64
主题别名 .......................................................................................................................................................69
载荷格式指示与内容类型 ............................................................................................................................. 73
共享订阅 .......................................................................................................................................................79
订阅选项 .......................................................................................................................................................85
订阅标识符 ................................................................................................................................................... 95
消息过期间隔 ...............................................................................................................................................101
最大报文大小 ..............................................................................................................................................106
原因码（Reason Code）........................................................................................................................... 110
增强认证 ...................................................................................................................................................... 113
控制报文 ...................................................................................................................................................... 118
结语 .............................................................................................................................................................123
