connect method

@override Future<MqttClientConnectionStatus?> connect([ String? username, String? password ])

Performs a connect to the message broker with an optional username and password for the purposes of authentication. If a username and password are supplied these will override any previously set in a supplied connection message so if you supply your own connection message and use the authenticateAs method to set these parameters do not set them again here.

Implementation

@override
Future<MqttClientConnectionStatus?> connect(
    [String? username, String? password]) async {
  instantiationCorrect = true;
  clientEventBus = events.EventBus();
  clientEventBus
      ?.on<DisconnectOnNoPingResponse>()
      .listen(disconnectOnNoPingResponse);
  clientEventBus
      ?.on<DisconnectOnNoMessageSent>()
      .listen(disconnectOnNoMessageSent);
  final connectionHandler = SynchronousMqttServerConnectionHandler(
      clientEventBus,
      maxConnectionAttempts: maxConnectionAttempts,
      reconnectTimePeriod: connectTimeoutPeriod,
      socketOptions: socketOptions);
  if (useWebSocket) {
    connectionHandler.secure = false;
    connectionHandler.useWebSocket = true;
    connectionHandler.useAlternateWebSocketImplementation =
        useAlternateWebSocketImplementation;
    if (connectionHandler.useAlternateWebSocketImplementation) {
      connectionHandler.securityContext = securityContext;
    }
    if (websocketProtocolString != null) {
      connectionHandler.websocketProtocols = websocketProtocolString;
    }
  }
  if (secure) {
    connectionHandler.secure = true;
    connectionHandler.useWebSocket = false;
    connectionHandler.useAlternateWebSocketImplementation = false;
    connectionHandler.securityContext = securityContext;
    connectionHandler.onBadCertificate =
        onBadCertificate as bool Function(Object certificate)?;
  }

  this.connectionHandler = connectionHandler;
  return await super.connect(username, password);
}