code: @Override
  	public boolean sendMessageToClient(MessageFromClient message, Session client) {
  		MessageToClient mtc = messageToClientService.createMessageToClient(message, client);
  		if (mtc != null) {
  			client.getAsyncRemote().sendObject(mtc);
  			return true;
  		}
  		return false;
  	}
docs: Build and send response messages after call request
  
  @param message
  @param client
  @return