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https://blog.csdn.net/libaineu2004/article/details/80493902今天在看MQTT协议文档，到处关于QoS（Quality of Service）的介绍，文档说如果没有收到对方的PUBREL等确认包，超时后server需要'delivery ret...

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Java秒杀系统实战系列~RabbitMQ死信队列处理超时未支付的订单

摘要：本篇博文是“Java秒杀系统实战系列文章”的第十篇，本篇博文我们将采用RabbitMQ的死信队列的方式处理“用户秒杀成功生成订单后，却迟迟没有支付”的情况，一起来见识一下RabbitMQ死信队列在实际业务环境下的强大之处！内容：对于消息中间件RabbitMQ，Debug其实在前面的篇章中已经...

mqtt发起订阅subscribe第一条信息时就出现超时；subcribe返回IOTX_MQTT_EVENT_SUBCRIBE_NACK；

设备端SDK使用问题 MQTT连接

公网接入MQ，client发送心跳超时是什么原因？

15:54:18.690 [MQClientFactoryScheduledThread] ERROR RocketmqClient - send heart beat to broker exceptioncom.aliyun.openservices.shade.com.alibaba.rock...

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