MQTTAsync client; MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer; MQTTAsync_token token; // 创建 MQTTAsync 客户端 MQTTAsync_create(&client, ADDRESS, CLIENTID, MQTTCLIENT_PERSISTENCE_NONE, NULL); // 设置连接参数 conn_opts.keepAliveInterval = 20; conn_opts....
MQTTAsync_message message = MQTTAsync_message_initializer; // 设置消息内容 message.payload = "Hello World!"; message.payloadlen = strlen(message.payload); message.qos = 1; message.retained = 0; // 发送一条消息,同时设置 Token MQTTAsync_sendMessage(client, "topic", &message, &token); ``...
message; 214 215#defineMQTTAsync_message_initializer{ {'M', 'Q', 'T' 'M'}, 0, 0, NULL, 0 0, 0, 0 } 216 243typedef intMQTTAsync_messageArrivedvoid* context char* topic, int topicLen, MQTTmessage* message); 244 263 typedef void MQTTAsync_deliveryComplete(void* ...
{ MQTTAsync client; MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer; int rc; // 创建 MQTT 客户端 MQTTAsync_create(&client, "tcp://mqtt.eclipseprojects.io:1883", "ClientID", MQTTCLIENT_PERSISTENCE_NONE, NULL); // 设置连接丢失、消息到达和消息传递完成的回调函数 ...
void connlost(void *context, char *cause) { MQTTAsync client = (MQTTAsync)context; MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer; int rc; printf("\nConnection lost\n"); printf(" cause: %s\n", cause); printf("Reconnecting\n"); conn_opts.keepAliveInterval = ...
问管理要为MQTTAsync_sendMessage发送的数据EN今天的IT预算主要花在了“保持灯亮”上。事实上，大约70%...
the LWT message to the LWT topic on * behalf of the client. This allows otherclients (subscribedto the LWT topic) * to be made aware that the client hasdisconnected. To enable the LWT * function for a specific client, a validpointer to an MQTTAsyncwillOptions * structure...
Jan 22 04:46:26 (none) local4.notice mqtt[407]: MQTT Trace : 3, 20210122 044626.524 (1995869824) (0)< MQTTAsync_isConnected:3646 (1) Jan 22 04:46:26 (none) local4.notice mqtt[407]: MQTT Trace : 3, 20210122 044626.524 (1995869824) (0)> MQTTAsync_sendMessage:4038 ...
非V5:MQTTAsync_responseOptions ropts = MQTTAsync_responseOptions_initializer; 两者的context赋值client 8.监听消息 MQTTAsync_setCallbacks设置的MQTTAsync_messageArrived会实时监听消息,接收到消息后,解析MQTTAsync_message结构体指针所包含的内容,对消息的处理将在这里进行,包括解析命令、存储数据库等操作。
qos = 2; MQTTAsync_sendMessage(client, topic.c_str(), &pubmsg, nullptr); } int main() { MQTTAsync client; MQTTAsync_create(&client, "tcp://localhost:1883", "PeriodicPublisher", MQTTCLIENT_PERSISTENCE_NONE, NULL); MQTTAsync_connectOptions conn_opts = MQTTAsync_connectOptions_initializer;...