From 36b23f0fe4ec1334102fa5d0a21d3692e9ce6da9 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 6 Sep 2013 21:30:32 +1200
Subject: Support Wondex keep alive (fix #380)

---
 src/org/traccar/ServerManager.java               |  5 +-
 src/org/traccar/protocol/WondexFrameDecoder.java | 60 ++++++++++++++++++++++++
 2 files changed, 61 insertions(+), 4 deletions(-)
 create mode 100644 src/org/traccar/protocol/WondexFrameDecoder.java

(limited to 'src/org/traccar')

diff --git a/src/org/traccar/ServerManager.java b/src/org/traccar/ServerManager.java
index ab81caafd..a997cb06f 100644
--- a/src/org/traccar/ServerManager.java
+++ b/src/org/traccar/ServerManager.java
@@ -674,11 +674,8 @@ public class ServerManager {
             serverList.add(new TrackerServer(this, new ServerBootstrap(), protocol) {
                 @Override
                 protected void addSpecificHandlers(ChannelPipeline pipeline) {
-                    byte delimiter[] = { (byte) '\r', (byte) '\n' };
-                    pipeline.addLast("frameDecoder",
-                            new DelimiterBasedFrameDecoder(1024, ChannelBuffers.wrappedBuffer(delimiter)));
+                    pipeline.addLast("frameDecoder", new WondexFrameDecoder());
                     pipeline.addLast("stringDecoder", new StringDecoder());
-                    pipeline.addLast("stringEncoder", new StringEncoder());
                     pipeline.addLast("objectDecoder", new WondexProtocolDecoder(ServerManager.this));
                 }
             });
diff --git a/src/org/traccar/protocol/WondexFrameDecoder.java b/src/org/traccar/protocol/WondexFrameDecoder.java
new file mode 100644
index 000000000..7ef5cc376
--- /dev/null
+++ b/src/org/traccar/protocol/WondexFrameDecoder.java
@@ -0,0 +1,60 @@
+/*
+ * Copyright 2013 Anton Tananaev (anton.tananaev@gmail.com)
+ *
+ * Licensed 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
+ *
+ *     http://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 org.traccar.protocol;
+
+import org.jboss.netty.buffer.ChannelBuffer;
+import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.ChannelHandlerContext;
+import org.jboss.netty.handler.codec.frame.FrameDecoder;
+import org.traccar.helper.ChannelBufferTools;
+
+public class WondexFrameDecoder extends FrameDecoder {
+    
+    private static final int KEEP_ALIVE_LENGTH = 6;
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx,
+            Channel channel,
+            ChannelBuffer buf) throws Exception {
+        
+        if (buf.readableBytes() < KEEP_ALIVE_LENGTH) {
+            return null;
+        }
+
+        if (buf.getUnsignedByte(buf.readerIndex()) == 0xD0) {
+
+            // Send response
+            ChannelBuffer frame = buf.readBytes(KEEP_ALIVE_LENGTH);
+            if (channel != null) {
+                channel.write(frame);
+            }
+
+        } else {
+
+            Integer index = ChannelBufferTools.find(buf, buf.readerIndex(), buf.readableBytes(), "\r\n");
+            if (index != null) {
+                ChannelBuffer frame = buf.readBytes(index - buf.readerIndex());
+                buf.skipBytes(2);
+                return frame;
+            }
+        
+        }
+
+        return null;
+    }
+
+}
-- 
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