static void Main(string[] args)
{
//此处填写购买得到的 MQTT 接入点域名
String brokerUrl = ConfigurationManager.AppSettings["Mqtt_BrokerUrl"];
//此处填写阿里云帐号 AccessKey
String accessKey = ConfigurationManager.AppSettings["Mqtt_AccessKey"];
//此处填写阿里云帐号 SecretKey
String secretKey = ConfigurationManager.AppSettings["Mqtt_SecretKey"];
//此处填写在 MQ 控制台创建的 Topic，作为 MQTT 的一级 Topic
String parentTopic = ConfigurationManager.AppSettings["Mqtt_ParentTopic"];
//此处填写客户端 ClientId，需要保证全局唯一，其中前缀部分即 GroupId 需要先在 MQ 控制台创建
String clientId = ConfigurationManager.AppSettings["Mqtt_GroupId"] + "@@@" + MainHelper.GetRandomString(16, true, true, true, false, "crm");
MqttClient client = new MqttClient(brokerUrl);
client.MqttMsgPublishReceived += client_recvMsg;
client.MqttMsgPublished += client_publishSuccess;
client.ConnectionClosed += client_connectLose;
String userName = accessKey;
//计算签名
String passWord = MainHelper.HMACSHA1(secretKey, clientId.Split('@')[0]);
client.Connect(clientId, userName, passWord, true, 60);
//订阅 Topic，支持多个 Topic，以及多级 Topic
//string[] subTopicArray = { parentTopic + "/subDemo1", parentTopic + "/subDemo2/level3" };
string[] subTopicArray = { parentTopic + "/School/", parentTopic + "/School/Sub1" };
byte[] qosLevels = { MqttMsgBase.QOS_LEVEL_AT_MOST_ONCE, MqttMsgBase.QOS_LEVEL_AT_MOST_ONCE };
client.Subscribe(subTopicArray, qosLevels);
Console.WriteLine(DateTime.Now.ToString() + " 开始接收消息队列信息！");
LogHelper.WriteProgramLog(DateTime.Now.ToString() + " 开始接收消息队列信息！");
//client.Publish(parentTopic + "/School/", Encoding.UTF8.GetBytes("接收成功！"), MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE, false);
////发送 P2P 消息，二级 topic 必须是 p2p,三级 topic 是接收客户端的 clientId
//client.Publish(parentTopic + "/p2p/" + clientId, Encoding.UTF8.GetBytes("hello mqtt"), MqttMsgBase.QOS_LEVEL_AT_LEAST_ONCE, false);
//System.Threading.Thread.Sleep(50000);
//client.Disconnect();
}
