“session taken over”错误通常意味着在MQTT协议中,客户端尝试连接到一个服务器时,发现其会话(session)已经被另一个客户端接管。这通常发生在多个客户端尝试使用相同的客户端ID连接到MQTT服务器时,根据MQTT协议规范,同一个客户端ID在同一时间内只能被一个客户端使用。 导致“session taken over”错误的可能原因 客户...
1420x8ESession taken overDISCONNECT 1430x8FTopic Filter invalidSUBACK, UNSUBACK, DISCONNECT 1440x90Topic Name invalidCONNACK, PUBACK, PUBREC, DISCONNECT 1450x91Packet Identifier in usePUBACK, PUBREC, SUBACK, UNSUBACK 1460x92Packet Identifier not foundPUBREL, PUBCOMP ...
142 0x8E Session taken over Another connection using the same ClientID has connected, causing this connection to be closed. 143 0x8F Topic Filter invalid The topic filter is correctly formed but is not accepted by the server. 144 0x90 Topic Name invalid The topic name is correctly formed ...
前面简介中讲到,在 MQTT 协议中有三个角色会参与到整个通信过程,发布者(publisher)、代理(broker)和订阅者(subscriber)。有别于传统的客户端/服务器通讯协议,MQTT协议并不是端到端的,消息传递通过代理,包括会话(session)也不是建立在发布者和订阅者之间,而是建立在端和代理之间。代理解除了发布者和订阅者之间的耦合。
Server may disconnect with any reason code defined in MQTT 5.0 specification. Notable mentions: 135(Not authorized) when reauthentication fails, current SAS token expires, or device's credentials change. 142(Session taken over) when new connection with the same client identity has been opened. ...
原因码(Reason Code) 名词解释 双字节(Two Byte Integer)、四字节数(Four Byte Integer) 可变字节数 (Variable Byte Integer) 二进制数据 (Binary Data) UTF-8 编码字符串 (UTF-8 Encoded String) UTF-8 编码字符串对 (UTF-8 String Pair) 参考来源 ...
有别于传统的客户端/服务器通讯协议,MQTT协议并不是端到端的,消息传递通过代理,包括会话(session)也不是建立在发布者和订阅者之间,而是建立在端和代理之间。代理解除了发布者和订阅者之间的耦合。 除了发布者和订阅者之间传递普通消息,代理还可以为发布者处理保留消息和遗愿消息,并可以更改服务质量(QoS)等级。
SessionTakenOver 142 0x8E - Session taken over Sent by: Server Description: Another Connection using the same ClientID has connected causing this Connection to be closed. TopicFilterInvalid 143 0x8F - Topic Filter invalid Sent by: Server Description: The Topic Filter is correctly formed, but ...
142:"Session taken over", 74+ 143:"Topic Filter invalid", 75+ 144:"Topic Name invalid", 76+ 145:"Packet Identifier in use", 77+ 146:"Packet Identifier not found", 78+ 147:"Receive Maximum exceeded", 79+ 148:"Topic Alias invalid", ...
有别于传统的客户端/服务器通讯协议,MQTT协议并不是端到端的,消息传递通过代理,包括会话(session)也不是建立在发布者和订阅者之间,而是建立在端和代理之间。代理解除了发布者和订阅者之间的耦合。 除了发布者和订阅者之间传递普通消息,代理还可以为发布者处理保留消息和遗愿消息,并可以更改服务质量(QoS)等级。