/// <summary>
/// Service Start action. Do not call this directly.
/// </summary>
/// <param name="cancellationToken">Cancelation token.</param>
/// <returns>Awaitable <see cref="Task" />.</returns>
public async Task StartAsync(CancellationToken cancellationToken = default(CancellationToken))
{
_serviceLog.LogInformation("Service start initiated");
_stopping = false;
// MQTT will message
var willMessage = new MqttApplicationMessageBuilder()
.WithTopic($"{TopicRoot}/connected")
.WithPayload(((int)ConnectionStatus.Disconnected).ToString())
.WithAtLeastOnceQoS()
.WithRetainFlag()
.Build();
// MQTT client options
var optionsBuilder = new MqttClientOptionsBuilder()
.WithTcpServer(_brokerSettings.BrokerIp, _brokerSettings.BrokerPort)
.WithClientId(MqttClientId.ToString())
.WithCleanSession()
.WithWillMessage(willMessage);
// MQTT credentials
if (!string.IsNullOrEmpty(_brokerSettings.BrokerUsername) && !string.IsNullOrEmpty(_brokerSettings.BrokerPassword))
{
optionsBuilder.WithCredentials(_brokerSettings.BrokerUsername, _brokerSettings.BrokerPassword);
}
var managedOptions = new ManagedMqttClientOptionsBuilder()
.WithAutoReconnectDelay(TimeSpan.FromSeconds(_brokerSettings.BrokerReconnectDelay))
.WithClientOptions(optionsBuilder.Build())
.Build();
// Subscribe to MQTT messages
await SubscribeAsync(cancellationToken)
.ConfigureAwait(false);
// Connect to MQTT
await MqttClient.StartAsync(managedOptions)
.ConfigureAwait(false);
// Call startup on inheriting service class
await StartServiceAsync(cancellationToken)
.ConfigureAwait(false);
_serviceLog.LogInformation("Service started successfully");
}
/// <summary>
/// Service Start action. Do not call this directly.
/// </summary>
/// <param name="cancellationToken">Cancelation token.</param>
/// <returns>Awaitable <see cref="Task" />.</returns>
public async Task StartAsync(CancellationToken cancellationToken = default)
{
_serviceLog.LogInformation("Service start initiated");
_stopping = false;
// MQTT will message
var willMessage = new MqttApplicationMessageBuilder()
.WithTopic($"{TopicRoot}/connected")
.WithPayload(((int)ConnectionStatus.Disconnected).ToString())
.WithAtLeastOnceQoS()
.WithRetainFlag()
.Build();
// MQTT client options
var optionsBuilder = new MqttClientOptionsBuilder()
.WithTcpServer(_brokerSettings.BrokerIp, _brokerSettings.BrokerPort)
.WithClientId(MqttClientId.ToString())
.WithCleanSession()
.WithWillMessage(willMessage);
// MQTT TLS support
if (_brokerSettings.BrokerUseTls)
{
if (_brokerSettings.BrokerTlsSettings == null)
{
throw new ArgumentNullException(nameof(_brokerSettings.BrokerTlsSettings));
}
var tlsOptions = new MqttClientOptionsBuilderTlsParameters
{
UseTls = _brokerSettings.BrokerUseTls,
AllowUntrustedCertificates = _brokerSettings.BrokerTlsSettings.AllowUntrustedCertificates,
IgnoreCertificateChainErrors = _brokerSettings.BrokerTlsSettings.IgnoreCertificateChainErrors,
IgnoreCertificateRevocationErrors = _brokerSettings.BrokerTlsSettings.IgnoreCertificateRevocationErrors,
SslProtocol = _brokerSettings.BrokerTlsSettings.SslProtocol,
Certificates = _brokerSettings.BrokerTlsSettings.Certificates
};
optionsBuilder.WithTls(tlsOptions);
}
// MQTT credentials
if (!string.IsNullOrEmpty(_brokerSettings.BrokerUsername) && !string.IsNullOrEmpty(_brokerSettings.BrokerPassword))
{
optionsBuilder.WithCredentials(_brokerSettings.BrokerUsername, _brokerSettings.BrokerPassword);
}
var managedOptions = new ManagedMqttClientOptionsBuilder()
.WithAutoReconnectDelay(TimeSpan.FromSeconds(_brokerSettings.BrokerReconnectDelay))
.WithClientOptions(optionsBuilder.Build())
.Build();
// Subscribe to MQTT messages
await SubscribeAsync(cancellationToken)
.ConfigureAwait(false);
// Connect to MQTT
await MqttClient.StartAsync(managedOptions)
.ConfigureAwait(false);
// Call startup on inheriting service class
await StartServiceAsync(cancellationToken)
.ConfigureAwait(false);
_serviceLog.LogInformation("Service started successfully");
}
