C#MQTTNET客户端使用说明
作者:互联网
C#MQTTNET客户端使用说明
1.如何使用
1.我想启动MQTT客户端,我该怎么做?
try
{
IMqttClient client = new MqttFactory().CreateMqttClient();
var build = new MqttClientOptionsBuilder()
//配置客户端Id
.WithClientId(model.ClientId)
//配置登录账号
.WithCredentials("test","1234")
//配置服务器IP端口 这里得端口号是可空的
.WithTcpServer("192.168.0.1", "8080")
//.WithTcpServer("www.baidu.com")这是一个例子
;
//连接
await client.ConnectAsync(build.Build());
}
catch (MqttConnectingFailedException) {
Console.WriteLine("身份校验失败");
}
catch (Exception ex){
var name = ex.GetType().FullName;
Console.WriteLine("出现异常");
Console.WriteLine(ex.Message);
}
2.我想收到服务器发来消息,我该怎么做?
client.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(MessageReceivedHandler);
/// <summary>
/// 收到消息
/// </summary>
/// <param name="obj"></param>
private void MessageReceivedHandler(MqttApplicationMessageReceivedEventArgs obj)
{
Console.WriteLine("===================================================");
Console.WriteLine("收到消息:");
Console.WriteLine($"主题:{obj.ApplicationMessage.Topic}");
Console.WriteLine($"消息:{Encoding.UTF8.GetString(obj.ApplicationMessage.Payload)}");
Console.WriteLine("+++++++++++++++++++++++++++++++++++++++++++++++++++");
Console.WriteLine();
}
client.UseApplicationMessageReceivedHandler(args=> {
Console.WriteLine("===================================================");
Console.WriteLine("收到消息:");
Console.WriteLine($"主题:{args.ApplicationMessage.Topic}");
Console.WriteLine($"消息:{Encoding.UTF8.GetString(args.ApplicationMessage.Payload)}");
Console.WriteLine("+++++++++++++++++++++++++++++++++++++++++++++++++++");
Console.WriteLine();
});
3.我想知道客户端是否连接成功,我该怎么做?
//连接成功
client.ConnectedHandler = new MqttClientConnectedHandlerDelegate(ConnectedHandler);
/// <summary>
/// 连接成功 在此处做订阅主题(Topic)操作
/// </summary>
/// <param name="obj"></param>
private void ConnectedHandler(MqttClientConnectedEventArgs obj)
{
Console.WriteLine("本客户端已连接成功");
Console.WriteLine($"地址:{model.IP}");
Console.WriteLine($"端口:{model.Port}");
Console.WriteLine($"客户端:{model.ClientId}");
Console.WriteLine($"账号:{model.Account}");
Console.WriteLine();
//第1种订阅方式
client.SubscribeAsync("主题名称").GetAwaiter().GetResult();
//第2种订阅方式
List<MqttTopicFilter> Topics = new List<MqttTopicFilter>();
Topics.Add(new MqttTopicFilter() { Topic= "主题名称A", QualityOfServiceLevel= MqttQualityOfServiceLevel.ExactlyOnce});
Topics.Add(new MqttTopicFilter() { Topic = "主题名称B" });
Topics.Add(new MqttTopicFilter() { Topic = "主题名称C" });
client.SubscribeAsync(Topics.ToArray()).GetAwaiter().GetResult();
//第3种订阅方式
MqttClientSubscribeOptionsBuilder builder = new MqttClientSubscribeOptionsBuilder();
builder.WithTopicFilter("AAA");
client.SubscribeAsync(builder.Build()).GetAwaiter().GetResult();
}
client.UseConnectedHandler(args=> {
Console.WriteLine("本客户端已连接成功");
Console.WriteLine($"地址:{model.IP}");
Console.WriteLine($"端口:{model.Port}");
Console.WriteLine($"客户端:{model.ClientId}");
Console.WriteLine($"账号:{model.Account}");
Console.WriteLine();
//第1种订阅方式
client.SubscribeAsync("主题名称").GetAwaiter().GetResult();
//第2种订阅方式
List<MqttTopicFilter> Topics = new List<MqttTopicFilter>();
Topics.Add(new MqttTopicFilter() { Topic = "主题名称A", QualityOfServiceLevel = MqttQualityOfServiceLevel.ExactlyOnce });
Topics.Add(new MqttTopicFilter() { Topic = "主题名称B" });
Topics.Add(new MqttTopicFilter() { Topic = "主题名称C" });
client.SubscribeAsync(Topics.ToArray()).GetAwaiter().GetResult();
//第3种订阅方式
MqttClientSubscribeOptionsBuilder builder = new MqttClientSubscribeOptionsBuilder();
builder.WithTopicFilter("AAA");
client.SubscribeAsync(builder.Build()).GetAwaiter().GetResult();
});
3.我想知道怎样重连服务器,我该怎么做?
//断开连接 重连就写在此处
client.DisconnectedHandler = new MqttClientDisconnectedHandlerDelegate(DisconnectedHandler);
/// <summary>
/// 客户端断开连接后,如果需要重连在此处实现
/// </summary>
/// <param name="obj"></param>
private void DisconnectedHandler(MqttClientDisconnectedEventArgs obj)
{
Console.WriteLine("本客户端已经断开连接");
Console.WriteLine();
try
{
client.ConnectAsync(options).GetAwaiter().GetResult();
}
catch (Exception)
{
Console.WriteLine("重连失败");
}
}
client.UseDisconnectedHandler(args =>
{
Console.WriteLine("本客户端已经断开连接");
Console.WriteLine();
try
{
client.ConnectAsync(options).GetAwaiter().GetResult();
}
catch (Exception)
{
Console.WriteLine("重连失败");
}
});
标签:Console,C#,Topics,MQTTNET,client,WriteLine,new,客户端 来源: https://blog.csdn.net/weixin_39934929/article/details/120277871