3. 设置MQTT相关参数 接下来我们设置MQTT的相关参数，包括版本号、客户端ID、账户密码等 MQTTPacket_connectData data = MQTTPacket_connectData_initializer; data.willFlag = 0; //MQTT版本为 v3 data.MQTTVersion = 3; //设置客户端ID data.clientID.cstring = opts.clientid; //设置客户端账户 data.username.cstring = opts.username; //设置客户端密码 data.password.cstring = opts.password; data.keepAliveInterval = 10; data.cleansession = 1; //连接到MQTT服务器