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   /*
    * Copyright 2013 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.example.rxtx;
  
  import io.netty.bootstrap.Bootstrap;
  import io.netty.channel.ChannelFuture;
  import io.netty.channel.ChannelInitializer;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.oio.OioEventLoopGroup;
  import io.netty.channel.rxtx.RxtxChannel;
  import io.netty.channel.rxtx.RxtxDeviceAddress;
  import io.netty.handler.codec.LineBasedFrameDecoder;
  import io.netty.handler.codec.string.StringDecoder;
  import io.netty.handler.codec.string.StringEncoder;
  
  /**
   * Sends one message to a serial device
   */
  public final class RxtxClient {
  
      static final String PORT = System.getProperty("port", "/dev/ttyUSB0");
  
      public static void main(String[] args) throws Exception {
          EventLoopGroup group = new OioEventLoopGroup();
          try {
              Bootstrap b = new Bootstrap();
              b.group(group)
               .channel(RxtxChannel.class)
               .handler(new ChannelInitializer<RxtxChannel>() {
                   @Override
                   public void initChannel(RxtxChannel ch) throws Exception {
                       ch.pipeline().addLast(
                           new LineBasedFrameDecoder(32768),
                           new StringEncoder(),
                           new StringDecoder(),
                           new RxtxClientHandler()
                       );
                   }
               });
  
              ChannelFuture f = b.connect(new RxtxDeviceAddress(PORT)).sync();
  
              f.channel().closeFuture().sync();
          } finally {
              group.shutdownGracefully();
          }
      }
  }