Step 3: 设置will_set 在连接到MQTT Broker之后,我们需要设置will_set消息。will_set消息是在客户端异常断开连接时发送的遗嘱消息。代码如下: client.will_set("offline_topic", "Client is offline", qos=1, retain=True) 1. 这里"offline_topic"是主题,"Client is offline"是消息内容,qos为消息质量服务等级...
在MQTT中,setWill方法用于设置遗嘱消息,即在客户端异常断开连接时,服务器可以发布的消息。 setWill方法通常由MQTT客户端调用,用于设置遗嘱消息的主题、负载和服务质量等级。当客户端与服务器建立连接时,客户端可以通过setWill方法告知服务器,在客户端异常断开连接时,服务器需要发布的遗嘱消息内容。这样可以确保在客户端...
(client_id=mqtt_client_id, clean_session=True) mqttclient.on_connect = on_connect mqttclient.username_pw_set(mqtt_username, mqtt_password) mqttclient.will_set("test/status", payload="Offline", qos=0, retain=True) mqttclient.connect_async(mqtt_server, port=mqtt_port, keepalive=70) mqtt...
通常在定义 MQTTClient_connectOptions 对象时会使用 MQTTClient_connectOptions_initializer 宏对其进行初始化操作;而在定义 MQTTClient_willOptions 对象时使用 MQTTClient_willOptions_initializer 宏对其初 始化。 4、设置回调函数 调用MQTTClient_setCallbacks 函数为应用程序设置回调函数,MQTTClient_setCallbacks 可设...
options.setWill("willTopic", WILL_DATA,2,false);returnoptions; }/** * MQTT客户端 */@BeanpublicMqttPahoClientFactorysenderMqttClientFactory(){DefaultMqttPahoClientFactoryfactory=newDefaultMqttPahoClientFactory(); factory.setConnectionOptions(getSenderMqttConnectOptions());returnfactory;...
(20);//设置遗嘱消息的话题,若客户端和服务器之间的连接意外断开,服务器将发布客户端的遗嘱信息options.setWill("willTopic",(clientId+"与服务器断开连接").getBytes(),0,false);//设置回调client.setCallback(newMqttProviderCallBack());client.connect(options);}catch(MqttException e){e.printStackTrace()...
一、Go语言简介 如果你是Go语言新手，或如果你对"并发(Concurrency)不是并行(parallelism)"这句话毫无赶...
void (*setWill)(char *willtp,char *willmg);//设置遗嘱 void (*start)(char * hostname,uint8_t *ip,uint16_t port,char *username,char *password,char* cId);//启动服务,并存储参数 void (*subscribe)(uint8_t flag,char *topic);//订阅消息 flag:0取消订阅 1:订阅消息 ...
To ensure that the mqtt client automatically tries to reconnect when the connection is dropped, you must set the client optionreconnectPeriodto a value greater than 0. A value of 0 will disable reconnection and then terminate the final connection when it drops. ...
{osDelay(10);/* 10 = 100ms */// setup your AP paramsWifiDeviceConfigapConfig={0};strcpy(apConfig.ssid,"H");// 设置wifi ssid "h" Set wifi ssidstrcpy(apConfig.preSharedKey,"12345678");// 设置wifi passward "12345678" Set wifi passwordapConfig.securityType=WIFI_SEC_TYPE_PSK;intnetId...