在C#中使用MQTTNet可以通过以下步骤进行:
安装MQTTNet NuGet包:在Visual Studio中打开NuGet包管理器,搜索并安装MQTTNet包。
创建MQTT客户端:使用以下代码示例创建一个MQTT客户端实例。
using MQTTnet;
using MQTTnet.Client;
var factory = new MqttFactory();
var mqttClient = factory.CreateMqttClient();
var options = new MqttClientOptionsBuilder()
.WithTcpServer("broker.hivemq.com", 1883) // MQTT服务器地址和端口号
.WithCredentials("username", "password") // 如果服务器需要用户名和密码认证
.Build();
await mqttClient.ConnectAsync(options);
var message = new MqttApplicationMessageBuilder()
.WithTopic("topic")
.WithPayload("payload")
.WithQualityOfServiceLevel(MQTTnet.Protocol.MqttQualityOfServiceLevel.AtLeastOnce)
.WithRetainFlag()
.Build();
await mqttClient.PublishAsync(message);
await mqttClient.SubscribeAsync(new TopicFilter("topic", MQTTnet.Protocol.MqttQualityOfServiceLevel.AtLeastOnce));
mqttClient.UseApplicationMessageReceivedHandler(e =>
{
Console.WriteLine($"Received message on topic {e.ApplicationMessage.Topic}: {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}");
});
通过以上步骤,您可以在C#中使用MQTTNet进行MQTT通信。