emitMessage method
Emit a message
Implementation
@protected
void emitMessage(Map<String, dynamic> message) {
_logger.info('BaseTransport: Emitting message: $message');
_logger.info('BaseTransport: Message type: ${message.runtimeType}');
_messageController.add(message);
_statistics['messagesReceived']++;
_statistics['bytesReceived'] += jsonEncode(message).length;
updateLastActivity();
}