/// <summary>
/// Opens the MQTT connection.
/// </summary>
public async Task StartAsync(IProcesMqttMessage messageHandler)
{
try
{
lock (startupLock)
{
if (_managedMqttClient != null || ConnectionState == ConnectionState.Connected)
{
return;
}
_messageHandler = messageHandler;
ConnectionState = ConnectionState.Connecting;
_managedMqttClient = _mqttClientFactory.CreateManagedMqttClient();
_managedMqttClient.ApplicationMessageReceivedHandler = this;
_managedMqttClient.ApplicationMessageProcessedHandler = this;
_managedMqttClient.ConnectedHandler = this;
_managedMqttClient.ConnectingFailedHandler = this;
_managedMqttClient.SynchronizingSubscriptionsFailedHandler = this;
_managedMqttClient.DisconnectedHandler = this;
}
await _managedMqttClient.StartAsync(_config.Options).ConfigureAwait(false);
}
catch (Exception e)
{
_logger.LogCritical(new EventId(0), e, $"Exception while setting up the mqttclient to {this}");
throw new MqttConnectionException($"Exception while setting up the mqttclient to {this}", e);
}
}
public async Task AddAsync(IMqttMessage item, CancellationToken cancellationToken = default)
{
if (_mqttConnection.ConnectionState != ConnectionState.Connected)
{
IProcesMqttMessage messageProcessor = null; // this is only for publising, we dont expect incoming messages
await _mqttConnection.StartAsync(messageProcessor).ConfigureAwait(false);
for (var i = 0; i < 100; i++)
{
if (_mqttConnection.ConnectionState != ConnectionState.Connected)
{
await Task.Delay(50).ConfigureAwait(false);
}
}
}
var qos = (MQTTnet.Protocol.MqttQualityOfServiceLevel)Enum.Parse(typeof(MQTTnet.Protocol.MqttQualityOfServiceLevel), item.QosLevel.ToString());
var mqttApplicationMessage = new MqttApplicationMessage
{
Topic = item.Topic,
Payload = item.GetMessage(),
QualityOfServiceLevel = qos,
Retain = item.Retain
};
await _mqttConnection.PublishAsync(mqttApplicationMessage).ConfigureAwait(false);
}
/// <summary>
/// Close the MQTT connection.
/// </summary>
public Task StopAsync()
{
if (_managedMqttClient == null)
{
return(Task.CompletedTask);
}
ConnectionState = ConnectionState.Disconnected;
_managedMqttClient.StopAsync().Wait();
_managedMqttClient.Dispose();
_managedMqttClient = null;
_messageHandler = null;
return(Task.CompletedTask);
}
