connectAuto method

@override Future<MqttClientConnectionStatus?> connectAuto(String server, int port)

Connect Auto

Implementation

@override
Future<MqttClientConnectionStatus?> connectAuto(String server, int port) {
  final completer = Completer<MqttClientConnectionStatus?>();
  MqttLogger.log('MqttWsConnection::connectAuto - entered');
  // Add the port if present
  Uri uri;
  try {
    uri = Uri.parse(server);
  } on Exception catch (_, stack) {
    final message =
        'MqttWsConnection::connectAuto - The URI supplied for the WS '
        'connection is not valid - $server';
    Error.throwWithStackTrace(NoConnectionException(message), stack);
  }
  if (uri.scheme != 'ws' && uri.scheme != 'wss') {
    final message =
        'MqttWsConnection::connectAuto - The URI supplied for the WS has '
        'an incorrect scheme - $server';
    throw NoConnectionException(message);
  }

  uri = uri.replace(port: port);

  final uriString = uri.toString();
  MqttLogger.log(
    'MqttWsConnection::connectAuto - WS URL is $uriString, protocols are $protocols',
  );
  try {
    // Connect and save the socket.
    WebSocket.connect(
          uriString,
          protocols: protocols.isNotEmpty ? protocols : null,
          headers: headers,
        )
        .then((socket) {
          client = socket;
          _startListening();
          completer.complete();
        })
        .catchError((e) {
          onError(e);
          completer.completeError(e);
        });
  } on Exception catch (_, stack) {
    final message =
        'MqttWsConnection::connectAuto - The connection to the message broker '
        '{$uriString} could not be made.';
    Error.throwWithStackTrace(NoConnectionException(message), stack);
  }
  return completer.future;
}