mqtt_packet_t *connect_packet = mqtt_connect("test_client", NULL, NULL); mqtt_send(socket_fd, connect_packet); printf("Sent MQTT CONNECT packet!\n"); free(connect_packet->data); free(connect_packet); // 接收 MQTT CONNACK 报文 mqtt_packet_t *connack_packet = (mqtt_packet_t *)...
mqtt_packet_t *connect_packet = mqtt_connect("test_client", NULL, NULL); mqtt_send(socket_fd, connect_packet); printf("Sent MQTT CONNECT packet!n"); free(connect_packet->data); free(connect_packet); // 接收 MQTT CONNACK 报文 mqtt_packet_t *connack_packet = (mqtt_packet_t *)malloc...
OnAuthPacket 当接收到认证数据包时调用。它旨在允许开发人员创建自己的 MQTT v5 认证数据包处理机制。在这里允许数据包的修改。 OnPacketRead 当从客户端接收到数据包时调用。允许对数据包进行修改。 OnPacketEncode 在数据包被编码并发送给客户端之前立即调用。允许修改数据包。 OnPacketSent 在数据包已发送给客户端...
数据包标识符packetId:订阅者向代理者订阅消息时,会自动为每个数据包添加唯一的标识; 主题/服务质量列表:一条SUBSCRIBE消息可以包含多个订阅,每个订阅由一个Topic主题和一个QoS级别组成;SUBSCRIBE消息中的主题可以包含通配符,以便订阅指定主题模式(而非特定的主题);如果当前客户端具有重复的订阅,那么代理者将会响应该主题...
Now, we will introduce the control packet used when disconnecting: DISCONNECT. In MQTT, both the client and the server can send a DISCONNECT packet to the other party before disconnecting the network connection, indicating the reason for the connection closure. The DISCONNECT packet sent by the ...
The CONNACK packet has no Payload. Conclusion CONNECT is the first MQTT packet sent by the client after the network connection between the client and the server is established. CONNACK, as the response packet of CONNECT, indicates the connection result through the reason code. The client and ser...
The first packet sent from the Server to the Client MUST be a CONNACK Packet. 连接返回码Connect Return code values 如果服务端收到了一个格式良好的CONNECT包,但是服务端由于某种原因不能处理,那么服务端应该尝试发送一个带有非零返回码的CONNACK包。如果服务端发送了一个包含非零返回码的CONNACK包,必须关闭...
maximumPacketSize: representing the Maximum Packet Size the Client is willing to acceptnumber, topicAliasMaximum: representing the Topic Alias Maximum value indicates the highest value that the Client will accept as a Topic Alias sent by the Servernumber, ...
lastSent 是MQTT消息包发送完成,调用的场景如下2个: MQTTAsync_writeComplete MQTTPacket_send 一个完整的MQTT数据包发送完成,lastSent被设置为当前时间 发送的场景: 2.1. MQTTPacket_send_disconnect(...) 2.2. MQTTPacket_send_puback(...) // 调用的是 MQTTPacket_send_ack(...) ...
If false (the default), if any other packet is sent during keep alive interval, the ping packet will not be sent this time. If true, the ping packet will be sent every time.{low_mem, boolean()}If true, the client will try to reduce memory usage by garbage collecting more frequently...