50x05 Connection rejected for unauthorizedClient connection is not authorized 6-255Reserved for future SUBACK Packet There are only 4 return codes in the SUBACK packet. Except that the return code 0x80 indicates failure, the other return codes indicate that the subscription is successful, and...
200x14The received MQTT packet type is not supported on this client 210x15Timeout waiting for PUBACK 220x16Timeout waiting for PUBREC 230x17Timeout waiting for PUBCOMP 30x3Connection Refused: Server Unavailable 40x4Connection Refused: Bad username or password ...
1310x83实现特有错误 (Implementation specific error)CONNACK, PUBACK, PUBREC, SUBACK, UNSUBACK, DISCONNECT 1320x84不支持的协议版本 (Unsupported Protocol Version)CONNACK 1330x85客户端标识符无效 (Client Identifier not valid)CONNACK 1340x86错误的用户名和密码 (Bad User Name or Password)CONNACK ...
client 的 keep alive 超时。 client 的网络中断,但是没有发送 DISCONNECT 包。 protocol error。 实践 LWT 通常和 Retained 消息合用来设置 client 的状态。 比如,当 client 连接时,设置 LWT 为Offline(retained=1), 然后发送一条保留消息,对同一个 topic 设置为Online。 这样 topic 的状态就被标记为Online, ...
ClientId = <<"test">>. {ok, ConnPid} = emqtt:start_link([{clientid, ClientId}]). {ok, _Props} = emqtt:connect(ConnPid). Topic = <<"guide/#">>. QoS = 1. {ok, _Props, _ReasonCodes} = emqtt:subscribe(ConnPid, {Topic, QoS}). {ok, _PktId} = emqtt:publish(ConnPid, ...
ClientId = <<"test">>. {ok, ConnPid} = emqtt:start_link([{clientid, ClientId}]). {ok, _Props} = emqtt:connect(ConnPid). Topic = <<"guide/#">>. QoS = 1. {ok, _Props, _ReasonCodes} = emqtt:subscribe(ConnPid, {Topic, QoS}). {ok, _PktId} = emqtt:publish(ConnPid, ...
ClientId:客户端的ID,可以自定义,必须保证唯一性,否则连接服务器的时候会导致服务器断开 1、添加依赖 implementation 'org.eclipse.paho:org.eclipse.paho.client.mqttv3:1.1.0' implementation 'org.eclipse.paho:org.eclipse.paho.android.service:1.1.1' ...
int MQTTClient_create(MQTTClient *handle, const char *serverURI, const char *clientId, int persistence_type, void * persistence_context ) 1. 2. 3. 4. 5. 6. 此函数创建一个 MQTT 客户端,以便连接到指定的服务器并使用指定的持久性存储(参考 MQTTClient_persistence 函数)。另外,与创建函数对应的...
客户端标识符clientId:用于标识连接到代理者的每个客户端,该标识符的取值对于代理者与客户端而言必须唯一; 清理会话cleanSession:用于告知代理者,当前客户端是否需要建立持久会话;当CleanSession = false时,代理者将存储客户端的所有订阅,以及客户端以服务质量(QoS)级别1或者2所订阅的全部遗漏消息;而当CleanSession = ...
Table 1. MQTT v3 Java client reason codes Reason codeValueCause REASON_CODE_BROKER_UNAVAILABLE3 REASON_CODE_CLIENT_ALREADY_CONNECTED32100 The client is already connected. REASON_CODE_CLIENT_ALREADY_DISCONNECTED32101 The client is already disconnected. ...