public void Create_SubscribeOptionsBuilder()
{
var factory = new MqttFactory();
var builder = factory.CreateSubscribeOptionsBuilder();
Assert.IsNotNull(builder);
}
public static async Task Subscribe_Topic()
{
/*
* This sample subscribes to a topic.
*/
var mqttFactory = new MqttFactory();
using (var mqttClient = mqttFactory.CreateMqttClient())
{
var mqttClientOptions = new MqttClientOptionsBuilder()
.WithTcpServer("broker.hivemq.com")
.Build();
await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
var mqttSubscribeOptions = mqttFactory.CreateSubscribeOptionsBuilder()
.WithTopicFilter(f => { f.WithTopic("mqttnet/samples/topic/1"); })
.Build();
var response = await mqttClient.SubscribeAsync(mqttSubscribeOptions, CancellationToken.None);
Console.WriteLine("MQTT client subscribed to topic.");
// The response contains additional data sent by the server after subscribing.
response.DumpToConsole();
}
}
private async Task ConnectionHandler(MqttClientConnectedEventArgs arg)
{
_mqttClient.UseApplicationMessageReceivedHandler(HandleDeviceMessage);
var mqttSubscribeOptions = _mqttFactory
.CreateSubscribeOptionsBuilder()
.WithTopicFilter(f => { f.WithTopic(_topicToSubscribe); })
.Build();
await _mqttClient.SubscribeAsync(mqttSubscribeOptions);
}
private async Task Handler(MqttClientConnectedEventArgs arg)
{
_mqttClient.UseApplicationMessageReceivedHandler(HandleDiscoveryTopic);
var mqttSubscribeOptions = _mqttFactory
.CreateSubscribeOptionsBuilder()
.WithTopicFilter(f => { f.WithTopic("homeassistant/#"); })
.Build();
await _mqttClient.SubscribeAsync(mqttSubscribeOptions);
}
public static async Task Handle_Received_Application_Message()
{
/*
* This sample subscribes to a topic and processes the received message.
*/
var mqttFactory = new MqttFactory();
using (var mqttClient = mqttFactory.CreateMqttClient())
{
var mqttClientOptions = new MqttClientOptionsBuilder()
.WithTcpServer("broker.hivemq.com")
.Build();
// Setup message handling before connecting so that queued messages
// are also handled properly. When there is no event handler attached all
// received messages get lost.
mqttClient.ApplicationMessageReceivedAsync += e =>
{
Console.WriteLine("Received application message.");
e.DumpToConsole();
return(Task.CompletedTask);
};
await mqttClient.ConnectAsync(mqttClientOptions, CancellationToken.None);
var mqttSubscribeOptions = mqttFactory.CreateSubscribeOptionsBuilder()
.WithTopicFilter(f => { f.WithTopic("mqttnet/samples/topic/2"); })
.Build();
await mqttClient.SubscribeAsync(mqttSubscribeOptions, CancellationToken.None);
Console.WriteLine("MQTT client subscribed to topic.");
Console.WriteLine("Press enter to exit.");
Console.ReadLine();
}
}
