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1   /*
2    * Copyright 2013 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   https://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.rxtx;
17  
18  import io.netty.channel.ChannelHandlerContext;
19  import io.netty.channel.SimpleChannelInboundHandler;
20  
21  public class RxtxClientHandler extends SimpleChannelInboundHandler<String> {
22  
23      @Override
24      public void channelActive(ChannelHandlerContext ctx) {
25          ctx.writeAndFlush("AT\n");
26      }
27  
28      @Override
29      public void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
30          if ("OK".equals(msg)) {
31              System.out.println("Serial port responded to AT");
32          } else {
33              System.out.println("Serial port responded with not-OK: " + msg);
34          }
35          ctx.close();
36      }
37  }