private MqttClientOptionsBuilder CreateOptionsBuilder(ClientCredentials credentials = null)
{
MqttClientOptionsBuilder clientOptionsBuilder = new MqttClientOptionsBuilder();
MqttClientOptionsBuilderTlsParameters tlsParameters = null;
string hostName = Settings.Client.BrokerHostname;
int portNum = Settings.Client.BrokerPort;
//check if broker endpoint for local connections is defined in environment, only possible for connections without credentials
if (credentials == null)
{
string brokerEndpoint = Environment.GetEnvironmentVariable("GE_BROKER_CONNECTION_ENDPOINT");
if (!string.IsNullOrEmpty(brokerEndpoint))
{
string[] tokens = brokerEndpoint.Split(':');
if (tokens.Length == 2)
{
hostName = tokens[0];
portNum = Convert.ToInt32(tokens[1], CultureInfo.InvariantCulture);
}
}
}
clientOptionsBuilder.WithCleanSession();
clientOptionsBuilder.WithClientId(ClientId);
if (portNum == 443)
{
clientOptionsBuilder.WithWebSocketServer(hostName);
}
else
{
clientOptionsBuilder.WithTcpServer(hostName, portNum);
}
if (credentials != null)
{
if (credentials.HasCertificates())
{
tlsParameters = new MqttClientOptionsBuilderTlsParameters
{
UseTls = true,
AllowUntrustedCertificates = Settings.Client.AllowUntrustedCertificates,
IgnoreCertificateChainErrors = Settings.Client.IgnoreCertificateChainErrors,
IgnoreCertificateRevocationErrors = Settings.Client.IgnoreCertificateRevocationErrors,
CertificateValidationHandler = CertificateValidationCallback,
Certificates = credentials.ClientCertAndCaChain,
SslProtocol = SslProtocols.Tls12
};
clientOptionsBuilder.WithTls(tlsParameters);
}
if (credentials.IsUserNameAndPasswordRequired())
{
credentials.GetUserNameAndPassword(ClientId, out string username, out string password);
clientOptionsBuilder.WithCredentials(username, password);
}
}
// settings for connection timeout and MQTT kepp alive interval, given in seconds
// (defaults in MQTTnet stack are CommunicationTimeout = 10 sec and KeepAlivePeriod = 15 sec.,
// see in MqttClientOptions.cs of MQTTnet)
clientOptionsBuilder.WithCommunicationTimeout(new TimeSpan(0, 0, Settings.Client.CommunicationTimeout));
clientOptionsBuilder.WithKeepAlivePeriod(new TimeSpan(0, 0, Settings.Client.MqttKeepAlivePeriod));
return(clientOptionsBuilder);
}