task_stack:mqtt堆栈默认6144 bytes,menuconfig可配置 buffer_size:接收和缓存的长度,默认1024 bytes username:连接到broker的用户名(服务器) password:连接到broker的密码(服务器) client_id:指向客户端id,一般是一个唯一的字符串,可从broker中获取 host:MQTT broker的ip地址,域名。设置了url会重写该参数 port:MQTT...
My goal is to increment the MQTT buffer size from the default 1024 bytes to 4096 bytes; to do this I used the menuconfig and enabled the "MQTT Using custom configurations" I set up the "Default MQTT Buffer Size" to 4096. Compiled and flashed correctly, but when I try to publish an ...
MQTT客户端数据变量mqtt_client初始化 Qcloud_IoT_Client*mqtt_client=NULL;mqtt_client=(Qcloud_IoT_Client*)HAL_Malloc(sizeof(Qcloud_IoT_Client));intrc=qcloud_iot_mqtt_init(mqtt_client,pParams); 客户端ID client_id初始化 char*client_id=NULL;client_id=HAL_Malloc(MAX_SIZE_OF_CLIENT_ID+1);HAL_...
将有效数据之后的一个字节设置为\0可以解决这一问题,但可能导致越界访问内存,所以我们需要在初始化时额外多申请一个字节内存,具体改动位于esp-mqtt/mqtt_client.c中的esp_mqtt_client_init函数: // Beforeclient->mqtt_state.in_buffer = (uint8_t*)malloc(buffer_size);// Afterclient->mqtt_state.in_buffer...
read-buffer-size: 8KB # 接收数据的 buffer size,默认:8k max-bytes-in-message: 10MB # 消息解析最大 bytes 长度,默认:10M buffer-allocator: heap # 堆内存和堆外内存,默认:堆内存 keep-alive-secs: 60 # keep-alive 时间,单位:秒 clean-session: true # mqtt clean session,默认:true ...
{"topic":"request","payload":"This is a reuqest","packet": {"properties": {"correlationData": {"type":"Buffer","data": [114,101,113,117,101,115,116,45,49] },"responseTopic":"response/requester1"} } } 回到第二个终端窗口,请求方订阅响应主题(在实际应用中,请求方需要在发布请求前订阅...
StringBuffer connectId = new StringBuffer(); for (int i = 0; i < length; i++) { int flag = (int) (Math.random() * Integer.MAX_VALUE) % 3; int randNum = (int) (Math.random() * Integer.MAX_VALUE); switch (flag) { case 0: connectId.append((char) (randNum % 26 + '...
constmqtt=require("mqtt");constclient=mqtt.connect("mqtt://test.mosquitto.org");client.on("connect",()=>{client.subscribe("presence",(err)=>{if(!err){client.publish("presence","Hello mqtt");}});});client.on("message",(topic,message)=>{// message is Bufferconsole.log(message.toStr...
(true);//设置重新连接的次数mqtt.setReconnectAttemptsMax(10);//设置重连的间隔时间(毫秒)mqtt.setReconnectDelay(2000);//设置心跳时间(秒)mqtt.setKeepAlive((short) 30);//设置缓冲的大小mqtt.setSendBufferSize(2 * 1024 * 1024);//设置客户端IDmqtt.setClientId(clientid);//设置用户名和字码mqtt....
_init(u8 index, char *usr_name, char *passwd, char *client_id) { if(index<MQTT_CONN_NUM) { MqttClientStruct *pClient=&g_sMqttWork.client_list[index]; MQTTPacket_connectData connect_init = MQTTPacket_connectData_initializer; if((pClient->rb=rt_ringbuffer_create(MQTT_RING_BUFF_SIZE))...