安装配置MQTT后,连接时提示‘Unable to connect to server’ 1. 首先排查 MQTT服务是否已启动 常用命令: emqx start 启动 emqx_ctl status 检查运行状态 emqx uninstall 服务卸载 emqx stop 停止 1. 2. 3. 4. 如果未启动,请启动emqx。 2. 检查配置项是否正确 检查IP地址和端口是否正确 MQTT默认端口:...
I have the same problem that started last night. Running HA 2023.11.1 homeassistant.log shows 2023-11-06 08:41:28.761 ERROR (MainThread) [homeassistant.components.mqtt.client] Failed to connect to MQTT server due to exception: [Errno 111] Connection refused ...
(status); DEBUG_PRINT("IP: "); DEBUG_PRINTLNT(WiFi.localIP()); DEBUG_PRINT("Firmware version: "); DEBUG_PRINTLNT(WiFi.firmwareVersion()); } //CONNECT TO MQTT BROKER client.setServer(mqtt_server, 1883); client.setCallback(callback); while (!client.connected()) { reconnect(); } ...
parent) ,ui(newUi::MainWindow) ,client_("ssl://autove.xxxxxx.com:8883","3300000031") ,topic_("/down/info") { ui->setupUi(this); client_.set_callback(cb_); mqtt::connect_options connOpts; connOpts.set_clean_session(true); connOpts.set_user_name("xxxx"); connOpts.set_password(...
{unsigned char sessionPresent,connack_rc;if(MQTTDeserialize_connack(&sessionPresent,&connack_rc,buf,buflen)!=1||connack_rc!=0){printf("Unable to connect, return code %d\n",connack_rc);goto exit;}}elsegoto exit;/* subscribe */topicString.cstring="substopic";len=MQTTSerialize_subscribe(buf...
在工程上点击鼠标右键,新建一个assets 导入证书 1.把mqtt服务器上面的cert.pem 证书下载到本地(该证书用于解开服务器证书) 2.复制证书 3.粘贴证书 使用证书 1.新建一个变量,用来选择验不验证证书 2.增加下面的函数 代码语言:javascript 代码运行次数:0 ...
* @param options A pointer to a valid MQTTAsync_connectOptions * structure.连接参数 * @return ::MQTTASYNC_SUCCESS if the client connect request was accepted. * If the client was unable to connect to the server, an error code is
Connect to IoT Hub A device can use the MQTT protocol to connect to an IoT hub using one of the following options: TheAzure IoT device SDKs. The MQTT protocol directly. Many corporate and educational firewalls block the MQTT port (TCP port 8883). If you can't open port 8883 in your ...
1. select a cloud server for MQTT broker, suggest to use Linux server by Amazon AWS or Alibaba cloud. 2. install MQTT broker applicatoin to your server, such as mosquito or EMQ X, chose open source type. 3. allow MQTT ports by cloud server's security group. 4. start MQTT service....
For example MQTT to OPC UA, MQTT to SAP, MQTT to SQL, MQTT to REST, etc. As a publisher, you can send data from non-MQTT capable sources to a broker and thus provide any MQTT subscriber with data. You can see practical use cases in our step-by-step guides: Connect to the Azure...