c#VS2017 MQTT
时间: 2024-02-02 14:09:12 浏览: 18
以下是使用C#和MQTTnet实现MQTT通信的示例代码,该代码使用Visual Studio 2017编写和编译:
```csharp
using System;
using System.Text;
using System.Threading.Tasks;
using MQTTnet;
using MQTTnet.Client;
using MQTTnet.Client.Options;
namespace MqttDemo
{
class Program
{
static async Task Main(string[] args)
{
var factory = new MqttFactory();
var client = factory.CreateMqttClient();
var options = new MqttClientOptionsBuilder()
.WithTcpServer("broker.hivemq.com", 1883) // 设置MQTT服务器地址和端口
.WithClientId("client001") // 设置客户端ID
.Build();
client.UseDisconnectedHandler(async e =>
{
Console.WriteLine("### DISCONNECTED FROM SERVER ###");
await Task.Delay(TimeSpan.FromSeconds(5));
try
{
await client.ConnectAsync(options); // 重新连接
}
catch
{
Console.WriteLine("### RECONNECTING FAILED ###");
}
});
client.UseApplicationMessageReceivedHandler(e =>
{
Console.WriteLine("### RECEIVED APPLICATION MESSAGE ###");
Console.WriteLine($"+ Topic = {e.ApplicationMessage.Topic}");
Console.WriteLine($"+ Payload = {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}");
Console.WriteLine($"+ QoS = {e.ApplicationMessage.QualityOfServiceLevel}");
Console.WriteLine($"+ Retain = {e.ApplicationMessage.Retain}");
Console.WriteLine();
// 处理接收到的消息
});
await client.ConnectAsync(options); // 连接MQTT服务器
Console.WriteLine("### CONNECTED TO SERVER ###");
// 订阅主题
await client.SubscribeAsync(new TopicFilterBuilder().WithTopic("test/topic").Build());
// 发布消息
var message = new MqttApplicationMessageBuilder()
.WithTopic("test/topic")
.WithPayload("Hello World!")
.WithExactlyOnceQoS()
.WithRetainFlag()
.Build();
await client.PublishAsync(message);
Console.ReadLine();
await client.DisconnectAsync(); // 断开MQTT连接
}
}
}
```