public async Task <Dictionary <string, Qos> > SubscribeAsync(Dictionary <string, Qos> subscriptions, CancellationToken cancellationToken)
{
var builder = new MqttClientSubscribeOptionsBuilder();
foreach (var entry in subscriptions)
{
builder.WithTopicFilter(entry.Key, MapQos(entry.Value));
}
try
{
var subscribeResult = await client.SubscribeAsync(builder.Build(), cancellationToken);
var gainedQoses = new Dictionary <string, Qos>();
foreach (var item in subscribeResult.Items)
{
var gained = (int)item.ResultCode;
if (gained < 0 || gained > 2)
{
throw new MqttException(message: $"Subscribe [topiic={item.TopicFilter.Topic}, qos={item.TopicFilter.QualityOfServiceLevel} failed: [resultCode={item.ResultCode}].");
}
gainedQoses[item.TopicFilter.Topic] = (Qos)gained;
}
return(gainedQoses);
}
catch (Exception e)
{
throw new MqttException(cause: e);
}
}
public MQTTClient()
{
var mqttClient = new MqttFactory().CreateMqttClient();
var optionBuilder = new MqttClientOptionsBuilder();
optionBuilder
.WithClientId("c001")
.WithTcpServer(opts =>
{
opts.Server = "127.0.0.1";
opts.Port = 108;
})
.WithCredentials("u001", "p001")
.WithCleanSession(true);
var options = optionBuilder.Build();
mqttClient.ConnectAsync(options, CancellationToken.None).Wait();
var recieveHander = new MsgRecieveHandler();
mqttClient.ApplicationMessageReceivedHandler = recieveHander;
var topicBuilder = new TopicFilterBuilder();
topicBuilder.WithTopic("家/客厅/空调/#")
.WithAtMostOnceQoS();
var topicHome = topicBuilder.Build();
var subscribOptionBuilder = new MqttClientSubscribeOptionsBuilder();
subscribOptionBuilder.WithTopicFilter(topicHome);
var subOpt = subscribOptionBuilder.Build();
mqttClient.SubscribeAsync(subOpt, CancellationToken.None).Wait();
var appMsg = new MqttApplicationMessage();
appMsg.Topic = "家/客厅/空调/开关";
appMsg.Payload = Encoding.UTF8.GetBytes("我来了~");
appMsg.QualityOfServiceLevel = MqttQualityOfServiceLevel.AtMostOnce;
appMsg.Retain = false;
mqttClient.PublishAsync(appMsg, CancellationToken.None).Wait();
//var appMsg = new MqttApplicationMessage("家/客厅/空调/开关",
// Encoding.UTF8.GetBytes("消息内容"),
// MqttQualityOfServiceLevel.AtMostOnce, false);
}
public RemoteMqttBroker(
ILogger <RemoteMqttBroker> logger,
IEventIdCreationSource eventIdCreationSource,
IOptions <MqttNetworkOptions>?options = null)
{
_logger = logger;
_eventIdCreationSource = eventIdCreationSource;
EventId eventId = GetNextEventId();
_logger.LogInformation(eventId, $"Creating Mqtt Client (Id: {ClientId}).");
MqttNetworkOptions mqttNetworkOptions = options?.Value ?? MqttNetworkOptions.Default;
mqttNetworkOptions.Host ??= MqttNetworkOptions.Default.Host !;
if (mqttNetworkOptions.Port < 0x0000)
{
throw new ArgumentOutOfRangeException(nameof(mqttNetworkOptions.Port), mqttNetworkOptions.Port, "Port number too small.");
}
else if (mqttNetworkOptions.Port > 0xffff)
{
throw new ArgumentOutOfRangeException(nameof(mqttNetworkOptions.Port), mqttNetworkOptions.Port, "Port number too large.");
}
if (mqttNetworkOptions.Timeout < 1)
{
throw new ArgumentOutOfRangeException(nameof(mqttNetworkOptions.Timeout), mqttNetworkOptions.Timeout, "Timeout timespan too small.");
}
else if (mqttNetworkOptions.Timeout > 99999)
{
throw new ArgumentOutOfRangeException(nameof(mqttNetworkOptions.Timeout), mqttNetworkOptions.Timeout, "Timeout timespan too large.");
}
_logger.LogInformation(eventId, $"MQTT Client Communication Timeout: {mqttNetworkOptions.Timeout} ms.");
var clientOptionsBuilder = new MqttClientOptionsBuilder()
.WithClientId(ClientId)
.WithCommunicationTimeout(TimeSpan.FromSeconds(60))
.WithTcpServer(mqttNetworkOptions.Host, mqttNetworkOptions.Port);
_mqttClient = new MqttFactory().CreateMqttClient();
_mqttClient.ConnectedHandler = new MqttClientConnectedHandlerDelegate(eventArgs =>
{
_logger.LogDebug("Client Connected. Reason: " + (eventArgs.AuthenticateResult?.ReasonString ?? "null"));
});
_mqttClient.DisconnectedHandler = new MqttClientDisconnectedHandlerDelegate(eventArgs =>
{
_logger.LogDebug(eventArgs.Exception, "Client Disconnected. Reason: " + (eventArgs.AuthenticateResult?.ReasonString ?? "null"));
});
CancellationTokenSource?cancellationTokenSource = null;
#region Connecting to remote Mqtt Broker
try
{
_logger.LogInformation(eventId, $"Connecting to remote Mqtt-Broker (mqtt://{mqttNetworkOptions.Host}:{mqttNetworkOptions.Port}).");
cancellationTokenSource = new CancellationTokenSource(TimeoutTimeSpan);
var result = _mqttClient.ConnectAsync(clientOptionsBuilder.Build(), cancellationTokenSource.Token).GetAwaiter().GetResult();
if (result.ResultCode != MqttClientConnectResultCode.Success)
{
throw new Exception("Mqtt-Client ConnectResultCode Success expected. Actual: " + result.ResultCode);
}
}
catch (OperationCanceledException)
{
string errorMessage = "Connect to remote Mqtt-Broker timed out.";
_logger.LogCritical(eventId, errorMessage);
throw new Exception(errorMessage);
}
catch (Exception exception)
{
string errorMessage = "Failed to connect to remote Mqtt-Broker.";
_logger.LogCritical(eventId, exception, errorMessage);
throw new Exception(errorMessage);
}
finally
{
cancellationTokenSource?.Dispose();
}
#endregion
#region Subscribing to relevant Events
try
{
_logger.LogInformation(eventId, $"Subscribing to relevant events.");
MqttQualityOfServiceLevel mqttQualityOfServiceLevel = MqttQualityOfServiceLevel.AtLeastOnce;
MqttClientSubscribeResultCode expectedSubscribeResultCode = MqttClientSubscribeResultCode.GrantedQoS1;
MqttClientSubscribeOptionsBuilder subscribeOptionsBuilder = new MqttClientSubscribeOptionsBuilder()
.WithTopicFilter(MqttTopics.TrackerHello, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.TrackerGoodbye, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.ClientJoinAccepted, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.ClientJoinDenied, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.ClientRegistered, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.ClientGoodbye, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.FileInfoPublished, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.FragmentDistributionStarted, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.FragmentDistributionDelivered, mqttQualityOfServiceLevel)
.WithTopicFilter(MqttTopics.FragmentDistributionEnded, mqttQualityOfServiceLevel);
cancellationTokenSource = new CancellationTokenSource(TimeoutTimeSpan); //timeout
MqttClientSubscribeResult result = _mqttClient.SubscribeAsync(subscribeOptionsBuilder.Build(), cancellationTokenSource.Token).GetAwaiter().GetResult();
foreach (MqttClientSubscribeResultItem item in result.Items)
{
if (item.ResultCode != expectedSubscribeResultCode)
{
throw new Exception($"Expected SubscribeResultCode {expectedSubscribeResultCode} for topic \"{item.TopicFilter.Topic}\". Actual: {item.ResultCode}");
}
}
}
catch (Exception exception)
{
string errorMessage;
if (exception is OperationCanceledException)
{
errorMessage = "Subscribing to all relevant Events to remote Mqtt-Broker timed out.";
_logger.LogCritical(eventId, errorMessage);
}
else
{
errorMessage = "Failed to subscribe to all relevant topics with expected SubscribeResultCode.";
_logger.LogCritical(eventId, exception, errorMessage);
}
try
{
_logger.LogInformation("Disconnecting from remote Mqtt-Broker");
MqttClientDisconnectOptions disconnectOptions = new MqttClientDisconnectOptions()
{
ReasonCode = MqttClientDisconnectReason.NormalDisconnection,
ReasonString = errorMessage
};
cancellationTokenSource = new CancellationTokenSource(TimeoutTimeSpan);
_mqttClient.DisconnectAsync(disconnectOptions, cancellationTokenSource.Token).GetAwaiter().GetResult();
}
catch (OperationCanceledException)
{
_logger.LogError(eventId, "Disconnecting from remote Mqtt-Broker timed out.");
}
catch (Exception disconnectException)
{
_logger.LogError(eventId, disconnectException, "Disconnecting from remote Mqtt-Broker failed.");
}
finally
{
cancellationTokenSource?.Dispose();
}
throw new Exception(errorMessage);
}
finally
{
cancellationTokenSource?.Dispose();
}
#endregion
}
