From 7e403cf979d3c01acb5b3dfe0ee37dfa83cba4ff Mon Sep 17 00:00:00 2001
From: Nikolay Vlahovski <nvlahovski@gmail.com>
Date: Wed, 17 May 2023 11:00:43 +0300
Subject: Add LengthFieldBasedFrameDecoder to TranSyncProtocol

---
 .../java/org/traccar/protocol/TranSyncProtocol.java   | 19 ++++++++++++++++++-
 .../org/traccar/protocol/TranSyncProtocolDecoder.java | 15 +++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)

(limited to 'src/main/java/org/traccar')

diff --git a/src/main/java/org/traccar/protocol/TranSyncProtocol.java b/src/main/java/org/traccar/protocol/TranSyncProtocol.java
index 0634642df..39db67585 100644
--- a/src/main/java/org/traccar/protocol/TranSyncProtocol.java
+++ b/src/main/java/org/traccar/protocol/TranSyncProtocol.java
@@ -1,5 +1,22 @@
+/*
+ * Copyright 2013 - 2023 Anton Tananaev (anton@traccar.org)
+ *
+ * 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 io.netty.handler.codec.LengthFieldBasedFrameDecoder;
+import io.netty.handler.codec.LineBasedFrameDecoder;
 import org.traccar.BaseProtocol;
 import org.traccar.PipelineBuilder;
 import org.traccar.TrackerServer;
@@ -14,9 +31,9 @@ public class TranSyncProtocol extends BaseProtocol {
         addServer(new TrackerServer(config, getName(), false) {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline, Config config) {
+                pipeline.addLast(new LengthFieldBasedFrameDecoder(256, 2, 1, 2, 0, true));
                 pipeline.addLast(new TranSyncProtocolDecoder(TranSyncProtocol.this));
             }
         });
     }
-
 }
diff --git a/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java b/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java
index d07b70365..bb8c9bbf9 100644
--- a/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/TranSyncProtocolDecoder.java
@@ -17,8 +17,10 @@ package org.traccar.protocol;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.ByteBufUtil;
+import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
 import org.traccar.BaseProtocolDecoder;
+import org.traccar.NetworkMessage;
 import org.traccar.Protocol;
 import org.traccar.helper.BitUtil;
 import org.traccar.helper.DateBuilder;
@@ -106,6 +108,18 @@ public class TranSyncProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
+    private void sendResponse(Channel channel) {
+        if (channel != null) {
+            ByteBuf response = Unpooled.buffer(5);
+            response.writeByte(22);
+            response.writeByte(1);
+            response.writeShort(response.capacity()); // length
+            response.writeByte(4);
+
+            channel.writeAndFlush(new NetworkMessage(response, channel.remoteAddress()));
+        }
+    }
+
     @Override
     protected Object decode(Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
         ByteBuf buf = (ByteBuf) msg;
@@ -189,6 +203,7 @@ public class TranSyncProtocolDecoder extends BaseProtocolDecoder {
                 }
             }
         }
+        sendResponse(channel);
         return position;
     }
 }
-- 
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