code: public ChannelFuture write(DatagramChannel datagramChannel, Object message)
  	{
  		return write(datagramChannel, message, serverAddress);
  	}
docs: Utility method used to send a message to the server. Users can also use
  datagramChannel.write(message, serverAddress) directly. This method
  delegates to {@link #write(DatagramChannel, Object, InetSocketAddress)}
  by passing in the InetSocketAddress stored in the class variable
  {@link #serverAddress}
  
  @param datagramChannel
  The channel on which the message is to be sent to remote
  server.
  @param message
  The message to be sent. <b>NOTE</b> The message should be a
  valid and encode-able by the encoders in the ChannelPipeline
  of this server.
  @return Returns a ChannelFuture which can be used to check the success of
  this operation. <b>NOTE</b> Success in case of UDP means message
  is sent to server. It does not mean that the server has received
  it.