protected void initializeBootstrap() {
f = new NioDatagramChannelFactory(Executors.newCachedThreadPool());
b = new ConnectionlessBootstrap(f);
b.setPipelineFactory(new UdpChannelPipelineFactory(this));
b.setOption("broadcast", "false");
b.setOption("sendBufferSize", 65536);
b.setOption("receiveBufferSize", 65536);
}