/// <summary>
/// Connect the client to the AR. The given options suit the testcases but have to be reviewed for a production environment regarding reconnecting for example.
/// </summary>
/// <param name="mqttClient">-</param>
/// <param name="onboardResponse">-</param>
/// <returns>No dedicated response.</returns>
public static async Task ConnectMqttClient(IMqttClient mqttClient, OnboardResponse onboardResponse)
{
var tlsParameters = new MqttClientOptionsBuilderTlsParameters
{
Certificates = new[] { ReadRootCertificates(), ReadClientCertificate(onboardResponse) },
UseTls = true
};
var options = new MqttClientOptionsBuilder()
.WithClientId(onboardResponse.ConnectionCriteria.ClientId)
.WithTcpServer(onboardResponse.ConnectionCriteria.Host,
int.Parse(onboardResponse.ConnectionCriteria.Port))
.WithTls(tlsParameters)
.WithCommunicationTimeout(TimeSpan.FromSeconds(20))
.Build();
await mqttClient.ConnectAsync(options);
}
private IMqttClientOptions GetMqttOption(string clientId)
{
var builder = new MqttClientOptionsBuilder()
.WithProtocolVersion(MqttProtocolVersion.V311)
.WithKeepAlivePeriod(TimeSpan.FromSeconds(5))
.WithCommunicationTimeout(TimeSpan.FromSeconds(15))
.WithClientId(clientId)
// this message will be sent to all clients
// subscribed to <clientId>/status topic
// if this client gets disconnected
.WithWillMessage(new MqttApplicationMessage
{
Payload = Encoding.UTF8.GetBytes("disconnected"),
Topic = String.Format("/{0}/status", clientId),
Retain = true,
QualityOfServiceLevel = MqttQualityOfServiceLevel.AtLeastOnce
});
// TODO: ?
// .WithCleanSession();
if (usingWebSockets)
{
builder.WithWebSocketServer(endPoint.Address + ":" + endPoint.Port + "/mqtt");
}
else
{
builder.WithTcpServer(endPoint.Address, endPoint.Port);
}
if (networkCredential != null)
{
builder.WithCredentials(networkCredential.UserName, networkCredential.Password);
}
if (useSsl)
{
var tlsParameters = new MqttClientOptionsBuilderTlsParameters {
UseTls = true
};
builder.WithTls(tlsParameters);
}
return(builder.Build());
}
public void Start(string certPath)
{
X509Certificate2 certificate = new X509Certificate2(certPath);
List <byte[]> certificates = new List <byte[]>();
certificates.Add(certificate.Export(X509ContentType.SerializedCert));
//setup connection options
MqttClientOptionsBuilderTlsParameters tlsOptions = new MqttClientOptionsBuilderTlsParameters
{
Certificates = certificates,
SslProtocol = SslProtocols.Tls12,
UseTls = true
};
tlsOptions.CertificateValidationCallback += CertificateValidationCallback;
// Create TCP based options using the builder.
var options = new MqttClientOptionsBuilder()
.WithClientId($"Test_C#_Client_{Guid.NewGuid()}")
.WithTcpServer(MqttServer, MqttPort)
.WithTls(tlsOptions)
.WithCleanSession()
.WithKeepAlivePeriod(TimeSpan.FromSeconds(90))
.WithKeepAliveSendInterval(TimeSpan.FromSeconds(60))
.Build();
var factory = new MqttFactory();
mqttClient = factory.CreateMqttClient();
mqttClient.UseApplicationMessageReceivedHandler(DataHandler);
mqttClient.UseConnectedHandler(ConnectedHandler);
mqttClient.UseDisconnectedHandler(DisconnectedHandler);
Console.WriteLine($"Connecting to mqtt.cloud.yandex.net...");
mqttClient.ConnectAsync(options, CancellationToken.None);
}
private static int _iLastUpdateThreshold = 5; // Minutes
public static async void StartMQTT(string strMQTTServer, bool bMQTTTLS, string strClientId, string strUser, string strPassword, MessageHandler messageHandler)
{
IManagedMqttClientOptions options;
MqttClientOptionsBuilder clientOptions;
MqttClientOptionsBuilderTlsParameters optionsTLS;
int iPort = 0;
string[] strMQTTServerArray;
string strMQTTBroker;
Logging.WriteDebugLog("MQTT.StartMQTT()");
if (strMQTTServer == null || strMQTTServer == "")
{
return;
}
_timerMQTT = new Timer(Update, null, TimeSpan.FromSeconds(10), TimeSpan.FromSeconds(30));
_strClientId = strClientId;
_messageHandler = messageHandler;
if (strMQTTServer.Contains(":"))
{
strMQTTServerArray = strMQTTServer.Split(new char[] { ':' });
if (strMQTTServerArray.Length != 2)
{
Logging.WriteDebugLog("MQTT.StartMQTT() MQTTBroker field has incorrect syntax (host or host:port)");
return;
}
if (!int.TryParse(strMQTTServerArray[1], out iPort) || iPort == 0)
{
Logging.WriteDebugLog("MQTT.StartMQTT() MQTTBroker field has incorrect syntax - port not non-zero numeric (host or host:port)");
return;
}
if (strMQTTServerArray[0].Length == 0)
{
Logging.WriteDebugLog("MQTT.StartMQTT() MQTTBroker field has incorrect syntax - missing host (host or host:port)");
return;
}
strMQTTBroker = strMQTTServerArray[0];
Logging.WriteDebugLog("MQTT.StartMQTT() Host: {0}, Port: {1}", strMQTTBroker, iPort);
}
else
{
strMQTTBroker = strMQTTServer;
Logging.WriteDebugLog("MQTT.StartMQTT() Host: {0}", strMQTTBroker);
}
clientOptions = new MqttClientOptionsBuilder().WithClientId(_strClientId).WithTcpServer(strMQTTBroker, (iPort == 0 ? null : iPort));
if (strUser != "")
{
clientOptions = clientOptions.WithCredentials(strUser, strPassword);
}
if (bMQTTTLS)
{
optionsTLS = new MqttClientOptionsBuilderTlsParameters
{
IgnoreCertificateChainErrors = true,
UseTls = true,
IgnoreCertificateRevocationErrors = true,
AllowUntrustedCertificates = true,
SslProtocol = System.Security.Authentication.SslProtocols.Tls12
};
clientOptions = clientOptions.WithTls(optionsTLS);
}
options = new ManagedMqttClientOptionsBuilder().WithAutoReconnectDelay(TimeSpan.FromSeconds(5)).WithClientOptions(clientOptions.Build()).Build();
_mqtt = new MqttFactory().CreateManagedMqttClient();
_mqtt.ApplicationMessageReceivedHandler = new MqttApplicationMessageReceivedHandlerDelegate(MessageProcessor);
await _mqtt.StartAsync(options);
}
public static async Task RunAsync()
{
// MqttNetConsoleLogger.ForwardToConsole();
// For most of these connections to work, set output target to Net5.0.
#if NET5_0_OR_GREATER
// TLS13 is only available in Net5.0
var unsafeTls13 = new MqttClientOptionsBuilderTlsParameters
{
UseTls = true,
SslProtocol = SslProtocols.Tls13,
// Don't use this in production code. This handler simply allows any invalid certificate to work.
CertificateValidationHandler = w => true
};
#endif
// Also defining TLS12 for servers that don't seem no to support TLS13.
var unsafeTls12 = new MqttClientOptionsBuilderTlsParameters
{
UseTls = true,
SslProtocol = SslProtocols.Tls12,
// Don't use this in production code. This handler simply allows any invalid certificate to work.
CertificateValidationHandler = w => true
};
// mqtt.eclipseprojects.io
await ExecuteTestAsync("mqtt.eclipseprojects.io TCP",
new MqttClientOptionsBuilder().WithTcpServer("mqtt.eclipseprojects.io", 1883)
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("mqtt.eclipseprojects.io WS",
new MqttClientOptionsBuilder().WithWebSocketServer("mqtt.eclipseprojects.io:80/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
#if NET5_0_OR_GREATER
await ExecuteTestAsync("mqtt.eclipseprojects.io WS TLS13",
new MqttClientOptionsBuilder().WithWebSocketServer("mqtt.eclipseprojects.io:443/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls13).Build());
#endif
// test.mosquitto.org
await ExecuteTestAsync("test.mosquitto.org TCP",
new MqttClientOptionsBuilder().WithTcpServer("test.mosquitto.org", 1883)
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("test.mosquitto.org TCP - Authenticated",
new MqttClientOptionsBuilder().WithTcpServer("test.mosquitto.org", 1884)
.WithCredentials("rw", "readwrite")
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("test.mosquitto.org TCP TLS12",
new MqttClientOptionsBuilder().WithTcpServer("test.mosquitto.org", 8883)
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls12).Build());
#if NET5_0_OR_GREATER
await ExecuteTestAsync("test.mosquitto.org TCP TLS13",
new MqttClientOptionsBuilder().WithTcpServer("test.mosquitto.org", 8883)
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls13).Build());
#endif
await ExecuteTestAsync("test.mosquitto.org TCP TLS12 - Authenticated",
new MqttClientOptionsBuilder().WithTcpServer("test.mosquitto.org", 8885)
.WithCredentials("rw", "readwrite")
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls12).Build());
await ExecuteTestAsync("test.mosquitto.org WS",
new MqttClientOptionsBuilder().WithWebSocketServer("test.mosquitto.org:8080/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("test.mosquitto.org WS TLS12",
new MqttClientOptionsBuilder().WithWebSocketServer("test.mosquitto.org:8081/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls12).Build());
// broker.emqx.io
await ExecuteTestAsync("broker.emqx.io TCP",
new MqttClientOptionsBuilder().WithTcpServer("broker.emqx.io", 1883)
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("broker.emqx.io TCP TLS12",
new MqttClientOptionsBuilder().WithTcpServer("broker.emqx.io", 8883)
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls12).Build());
#if NET5_0_OR_GREATER
await ExecuteTestAsync("broker.emqx.io TCP TLS13",
new MqttClientOptionsBuilder().WithTcpServer("broker.emqx.io", 8883)
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls13).Build());
#endif
await ExecuteTestAsync("broker.emqx.io WS",
new MqttClientOptionsBuilder().WithWebSocketServer("broker.emqx.io:8083/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("broker.emqx.io WS TLS12",
new MqttClientOptionsBuilder().WithWebSocketServer("broker.emqx.io:8084/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).WithTls(unsafeTls12).Build());
// broker.hivemq.com
await ExecuteTestAsync("broker.hivemq.com TCP",
new MqttClientOptionsBuilder().WithTcpServer("broker.hivemq.com", 1883)
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
await ExecuteTestAsync("broker.hivemq.com WS",
new MqttClientOptionsBuilder().WithWebSocketServer("broker.hivemq.com:8000/mqtt")
.WithProtocolVersion(MqttProtocolVersion.V311).Build());
// mqtt.swifitch.cz: Does not seem to operate any more
// cloudmqtt.com: Cannot test because it does not offer a free plan any more.
Write("Finished.", ConsoleColor.White);
Console.ReadLine();
}
public MqttClientOptionsBuilder WithTls(MqttClientOptionsBuilderTlsParameters parameters)
{
_tlsParameters = parameters ?? throw new ArgumentNullException(nameof(parameters));
return(this);
}
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);
}
public async Task ConnectAsync(Options options, TaskCompletionSource <int> closedPromise)
{
if (options.Verbose)
{
MqttNetGlobalLogger.LogMessagePublished += (s, e) =>
{
var trace = $">> [{e.LogMessage.Timestamp:O}] [{e.LogMessage.ThreadId}] [{e.LogMessage.Source}] [{e.LogMessage.Level}]: {e.LogMessage.Message}";
if (e.LogMessage.Exception != null)
{
trace += Environment.NewLine + e.LogMessage.Exception.ToString();
}
Console.WriteLine(trace);
};
}
var factory = new MqttFactory();
var client = factory.CreateMqttClient();
client.UseApplicationMessageReceivedHandler(msg => this.HandleMessageAsync(msg));
var tlsOptions = new MqttClientOptionsBuilderTlsParameters();
tlsOptions.UseTls = true;
var clientOptions = new MqttClientOptionsBuilder()
.WithTcpServer(opt => opt.NoDelay = true)
.WithClientId(options.ClientId)
.WithTcpServer(options.Hostname, 8883)
.WithTls(tlsOptions)
.WithProtocolVersion(MQTTnet.Formatter.MqttProtocolVersion.V500)
// .WithUserProperty("host", hostName) // normally it is not needed as SNI is added by most TLS implementations.
.WithUserProperty("api-version", "2020-10-01-preview")
.WithCommunicationTimeout(TimeSpan.FromSeconds(30))
.WithKeepAlivePeriod(TimeSpan.FromSeconds(300))
.WithCleanSession(false); // keep existing subscriptions
if (string.IsNullOrEmpty(options.SasKey))
{
tlsOptions.Certificates = new[] { new X509Certificate(options.ClientCertificatePath, options.ClientCertificatePassword) };
clientOptions.WithAuthentication("X509", null);
}
else
{
var at = DateTimeOffset.UtcNow;
var atString = at.ToUnixTimeMilliseconds().ToString();
var expiry = at.AddMinutes(40);
var expiryString = expiry.ToUnixTimeMilliseconds().ToString();
string toSign = $"{options.Hostname}\n{options.ClientId}\n{options.SasPolicy}\n{atString}\n{expiryString}\n";
var hmac = new HMACSHA256(Convert.FromBase64String(options.SasKey));
var sas = hmac.ComputeHash(Encoding.UTF8.GetBytes(toSign));
clientOptions
.WithAuthentication("SAS", sas)
.WithUserProperty("sas-at", atString)
.WithUserProperty("sas-expiry", expiryString);
if (!string.IsNullOrEmpty(options.SasPolicy))
{
// include only if using SAS policy
clientOptions.WithUserProperty("sas-policy", options.SasPolicy);
}
}
// Set up disconnection handling: print out details and allow process to close
client.UseDisconnectedHandler(disconnectArgs =>
{
Console.WriteLine($"Disconnected: {disconnectArgs.ReasonCode}");
if (disconnectArgs.AuthenticateResult?.UserProperties != null)
{
foreach (var prop in disconnectArgs.AuthenticateResult.UserProperties)
{
Console.WriteLine($"{prop.Name}: {prop.Value}");
}
}
closedPromise.SetResult(1);
});
try
{
// once connection is established, we may start receiving messages based on subscriptions
// from previous connections - better set client before connection.
this.client = client;
var connectResult = await client.ConnectAsync(clientOptions.Build(), CancellationToken.None);
if (connectResult.ResultCode != MqttClientConnectResultCode.Success)
{
var status = GetStatus(connectResult.UserProperties)?.ToString("x4");
throw new Exception($"Connect failed. Status: {connectResult.ResultCode}; status: {status}");
}
if (!connectResult.IsSessionPresent)
{
// only subscribe if haven't subscribed already.
// This optimization only works of a single SUBSCRIBE is used to subscribe to everything at once or
// if app keeps track of what has been successfully acknowledged by server.
var subscribeResult = await client.SubscribeAsync(
new MqttTopicFilter
{
Topic = "$iothub/methods/+",
QualityOfServiceLevel = MqttQualityOfServiceLevel.AtMostOnce
},
new MqttTopicFilter
{
Topic = "$iothub/commands",
QualityOfServiceLevel = MqttQualityOfServiceLevel.AtLeastOnce
},
new MqttTopicFilter
{
Topic = "$iothub/twin/patch/desired",
QualityOfServiceLevel = MqttQualityOfServiceLevel.AtMostOnce
});
// make sure subscriptions were successful
if (subscribeResult.Items.Count != 3 ||
subscribeResult.Items[0].ResultCode != MqttClientSubscribeResultCode.GrantedQoS0 ||
subscribeResult.Items[1].ResultCode != MqttClientSubscribeResultCode.GrantedQoS1 ||
subscribeResult.Items[2].ResultCode != MqttClientSubscribeResultCode.GrantedQoS0)
{
throw new ApplicationException("Failed to subscribe");
}
}
}
catch (MqttConnectingFailedException ex)
{
Console.WriteLine($"Failed to connect, reason code: {ex.ResultCode}");
if (ex.Result?.UserProperties != null)
{
foreach (var prop in ex.Result.UserProperties)
{
Console.WriteLine($"{prop.Name}: {prop.Value}");
}
}
throw;
}
}
private void Start(string brokerUrl, int port, string clientId, string username, string password, X509Certificate2 serverRootCa, X509Certificate clientCertificate, string[] topics)
{
_brokerUrl = brokerUrl;
_port = port;
Topics = topics;
_serverRootCa = serverRootCa;
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Start MQTT Client..."
}, LogRecordLevel.Info));
try
{
lock (_lockObject)
{
var optionsBuilder = new MqttClientOptionsBuilder()
.WithClientId(clientId)
.WithTcpServer(brokerUrl, port)
.WithCleanSession()
//.WithKeepAliveSendInterval(TimeSpan.FromSeconds(KeepAliveIntervalSec)) // Keep alive send interval
.WithKeepAlivePeriod(TimeSpan.FromSeconds(KeepAliveIntervalSec * 1.5)); // Time after last keep alive when IoT Core will disconnect the client
if (clientCertificate == null)
{
//auth by username and password
optionsBuilder.WithCredentials(username, password);
if (serverRootCa != null)
{
MqttClientOptionsBuilderTlsParameters tlsOptions = new MqttClientOptionsBuilderTlsParameters();
tlsOptions.UseTls = true;
tlsOptions.AllowUntrustedCertificates = true;
//tlsOptions.IgnoreCertificateChainErrors = true;
//tlsOptions.IgnoreCertificateRevocationErrors = true;
tlsOptions.CertificateValidationCallback += MqttClient_CertificateValidationCallback;
optionsBuilder.WithTls(tlsOptions);
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Setup connection with username and password over TLS"
}, LogRecordLevel.Info));
}
else
{
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Setup connection with username and password"
}, LogRecordLevel.Info));
}
}
else
{
// Auth by client certificate
List <X509Certificate> certificates = new List <X509Certificate>();
certificates.Add(clientCertificate);
MqttClientOptionsBuilderTlsParameters tlsOptions = new MqttClientOptionsBuilderTlsParameters();
tlsOptions.Certificates = certificates;
tlsOptions.UseTls = true;
tlsOptions.AllowUntrustedCertificates = true;
//tlsOptions.IgnoreCertificateChainErrors = true;
//tlsOptions.IgnoreCertificateRevocationErrors = true;
if (serverRootCa != null)
{
tlsOptions.AllowUntrustedCertificates = true;
tlsOptions.CertificateValidationCallback += MqttClient_CertificateValidationCallback;
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Setup connection with client and server certificate over TLS"
}, LogRecordLevel.Info));
}
else
{
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Setup connection with client certificate over TLC"
}, LogRecordLevel.Info));
}
optionsBuilder.WithTls(tlsOptions);
}
_options = optionsBuilder.Build();
while (true)
{
try
{
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Connecting to MQTT server ..."
}, LogRecordLevel.Info));
_mqttClient.ConnectAsync(_options).Wait(new TimeSpan(Timeout));
break;
}
catch (Exception ex)
{
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"Can't connect to MQTT server: {ex.Message}"
}, LogRecordLevel.Error));
Thread.Sleep(Timeout);
}
}
}
}
catch (Exception ex)
{
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"MQTT Client start was failed: {ex.Message}"
}, LogRecordLevel.Error));
}
Logger.Instance.AppendLog(new LogRecord(DateTime.Now, new List <string> {
$"MQTT Client started"
}, LogRecordLevel.Info));
}
public static async void exec()
{
Console.WriteLine("Enter ClientID");
string ClientID = Console.ReadLine();
Console.WriteLine("Chat with:");
string Friend = Console.ReadLine();
IManagedMqttClient mqttClient = new MqttFactory().CreateManagedMqttClient();
try
{
MqttClientOptionsBuilderTlsParameters TlsOptions = new MqttClientOptionsBuilderTlsParameters
{
UseTls = false
};
var options = new MqttClientOptionsBuilder()
.WithClientId(Guid.NewGuid().ToString("N"))
.WithTcpServer("localhost")
.WithTls(TlsOptions);
var moptions = new ManagedMqttClientOptionsBuilder()
.WithAutoReconnectDelay(TimeSpan.FromSeconds(5))
.WithClientOptions(options)
.Build();
await mqttClient.StartAsync(moptions);
}
catch (Exception ex)
{
throw ex;
}
mqttClient.ApplicationMessageReceived += (s, e) =>
{
//Console.WriteLine("### RECEIVED APPLICATION MESSAGE ###");
Console.WriteLine($"{e.ApplicationMessage.Topic}: {Encoding.UTF8.GetString(e.ApplicationMessage.Payload)}");
//Console.WriteLine($"+ Payload = ");
//Console.WriteLine($"+ QoS = {e.ApplicationMessage.QualityOfServiceLevel}");
//Console.WriteLine($"+ Retain = {e.ApplicationMessage.Retain}");
Console.WriteLine();
};
mqttClient.Connected += async(s, e) =>
{
Console.WriteLine("### CONNECTED WITH SERVER ###");
// Subscribe to a topic
await mqttClient.SubscribeAsync(new TopicFilterBuilder().WithTopic($"chat/{Friend}").Build());
Console.WriteLine("### SUBSCRIBED ###");
};
while (true)
{
string msg = Console.ReadLine();
var message = new MqttApplicationMessageBuilder()
.WithTopic($"chat/{ClientID}")
.WithPayload(msg)
.Build();
await mqttClient.PublishAsync(message);
}
}
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));
}
/// <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");
}
