public static MqttStatus Connect(string url, MqttConfig config)
{
Guid key = Guid.NewGuid();
try
{
#if DEBUG
IMqttClient client = new MqttFactory().CreateMqttClient(new ConsoleLogger());
#else
IMqttClient client = new MqttFactory().CreateMqttClient();
#endif
var b = new MqttClientOptionsBuilder()
.WithTcpServer(url, config.Port)
.WithKeepAlivePeriod(TimeSpan.FromSeconds(config.KeepAlive))
.WithMaximumPacketSize(Convert.ToUInt32(config.BufferSize))
.WithCommunicationTimeout(TimeSpan.FromSeconds(config.ConnectionTimeout))
.WithCleanSession(config.CleanSession);
if (config.SessionExpiryInterval > 0)
{
b = b.WithSessionExpiryInterval((uint)config.SessionExpiryInterval);
}
if (!string.IsNullOrEmpty(config.ClientId))
{
b = b.WithClientId(config.ClientId);
}
if (!config.SSLConnection)
{
b = b.WithCredentials(config.UserName, config.Password);
}
switch (config.ProtocolVersion)
{
case 310:
b = b.WithProtocolVersion(MqttProtocolVersion.V310);
break;
case 311:
b = b.WithProtocolVersion(MqttProtocolVersion.V311);
break;
case 500:
b = b.WithProtocolVersion(MqttProtocolVersion.V500);
break;
default:
throw new InvalidDataException("Invalid protocol versions. Valid versions are 310, 311 or 500");
}
if (config.SSLConnection)
{
string base64CACert = RSAKeys.GetPlainBase64(config.CAcertificate);
X509Certificate2 caCert = new X509Certificate2(Convert.FromBase64String(base64CACert));
byte[] caBytes = caCert.Export(X509ContentType.Cert);
string base64Client = RSAKeys.GetPlainBase64(config.ClientCertificate);
X509Certificate2 cliCert = new X509Certificate2(Convert.FromBase64String(base64Client), config.ClientCerificatePassphrase);
cliCert = cliCert.CopyWithPrivateKey(RSAKeys.ImportPrivateKey(config.PrivateKey, new PasswordFinder(config.ClientCerificatePassphrase)));
byte[] cliBytes = cliCert.Export(X509ContentType.Pfx);
try
{
var tls = new MqttClientOptionsBuilderTlsParameters
{
SslProtocol = System.Security.Authentication.SslProtocols.Tls12 | System.Security.Authentication.SslProtocols.Tls11 | System.Security.Authentication.SslProtocols.Tls,
UseTls = true,
AllowUntrustedCertificates = true,
IgnoreCertificateChainErrors = true,
IgnoreCertificateRevocationErrors = true,
Certificates = new List <X509Certificate>()
{
caCert, cliCert
},
//CertificateValidationHandler = context => true
CertificateValidationCallback = (certificate, chain, sslError, opts) => true
};
b = b.WithTls(tls);
}
finally
{
caCert.Dispose();
cliCert.Dispose();
}
}
client.UseDisconnectedHandler(async e =>
{
try
{
if (Connections.ContainsKey(key))
{
await Task.Delay(TimeSpan.FromSeconds(config.AutoReconnectDelay));
MqttClientAuthenticateResult reconnectResult = await client.ConnectAsync(b.Build());
SubscribePreviousConnection(key, reconnectResult);
}
}
catch
{
Connections.Remove(key);
client.Dispose();
}
});
MqttClientAuthenticateResult result = client.ConnectAsync(b.Build()).GetAwaiter().GetResult();
MqttClient mqtt = new MqttClient(client, config);
Connections[key] = mqtt;
SubscribePreviousConnection(key, result);
}
catch (Exception ex)
{
return(MqttStatus.Fail(Guid.Empty, ex));
}
return(MqttStatus.Success(key));
}