From c524d170f3324ccf10944887faa3d9f35e99e31a Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 29 May 2020 23:11:19 -0700
Subject: Fix protocol decoding

---
 .../org/traccar/protocol/DingtekFrameDecoder.java  | 43 ++++++++++++++++++++++
 .../java/org/traccar/protocol/DingtekProtocol.java |  7 +++-
 .../traccar/protocol/DingtekProtocolDecoder.java   | 33 +++++++++++------
 3 files changed, 69 insertions(+), 14 deletions(-)
 create mode 100644 src/main/java/org/traccar/protocol/DingtekFrameDecoder.java

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

diff --git a/src/main/java/org/traccar/protocol/DingtekFrameDecoder.java b/src/main/java/org/traccar/protocol/DingtekFrameDecoder.java
new file mode 100644
index 000000000..a8e35cc5c
--- /dev/null
+++ b/src/main/java/org/traccar/protocol/DingtekFrameDecoder.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2020 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.buffer.ByteBuf;
+import io.netty.channel.Channel;
+import io.netty.channel.ChannelHandlerContext;
+import org.traccar.BaseFrameDecoder;
+
+import java.nio.charset.StandardCharsets;
+
+public class DingtekFrameDecoder extends BaseFrameDecoder {
+
+    @Override
+    protected Object decode(
+            ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
+
+        if (buf.readableBytes() < 10) {
+            return null;
+        }
+
+        int length = Integer.parseInt(buf.toString(8, 2, StandardCharsets.US_ASCII), 16) * 2;
+        if (buf.readableBytes() >= length) {
+            return buf.readRetainedSlice(length);
+        }
+
+        return null;
+    }
+
+}
diff --git a/src/main/java/org/traccar/protocol/DingtekProtocol.java b/src/main/java/org/traccar/protocol/DingtekProtocol.java
index 31962202c..cf2a6c0f5 100644
--- a/src/main/java/org/traccar/protocol/DingtekProtocol.java
+++ b/src/main/java/org/traccar/protocol/DingtekProtocol.java
@@ -15,7 +15,8 @@
  */
 package org.traccar.protocol;
 
-import io.netty.handler.codec.LengthFieldBasedFrameDecoder;
+import io.netty.handler.codec.string.StringDecoder;
+import io.netty.handler.codec.string.StringEncoder;
 import org.traccar.BaseProtocol;
 import org.traccar.PipelineBuilder;
 import org.traccar.TrackerServer;
@@ -26,7 +27,9 @@ public class DingtekProtocol extends BaseProtocol {
         addServer(new TrackerServer(false, getName()) {
             @Override
             protected void addProtocolHandlers(PipelineBuilder pipeline) {
-                pipeline.addLast(new LengthFieldBasedFrameDecoder(1024, 4, 1));
+                pipeline.addLast(new DingtekFrameDecoder());
+                pipeline.addLast(new StringDecoder());
+                pipeline.addLast(new StringEncoder());
                 pipeline.addLast(new DingtekProtocolDecoder(DingtekProtocol.this));
             }
         });
diff --git a/src/main/java/org/traccar/protocol/DingtekProtocolDecoder.java b/src/main/java/org/traccar/protocol/DingtekProtocolDecoder.java
index 1488c2cd6..98fe4b7b3 100644
--- a/src/main/java/org/traccar/protocol/DingtekProtocolDecoder.java
+++ b/src/main/java/org/traccar/protocol/DingtekProtocolDecoder.java
@@ -17,13 +17,16 @@ 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.DeviceSession;
 import org.traccar.Protocol;
+import org.traccar.helper.DataConverter;
 import org.traccar.model.Position;
 
 import java.net.SocketAddress;
+import java.util.Date;
 
 public class DingtekProtocolDecoder extends BaseProtocolDecoder {
 
@@ -35,23 +38,29 @@ public class DingtekProtocolDecoder extends BaseProtocolDecoder {
     protected Object decode(
             Channel channel, SocketAddress remoteAddress, Object msg) throws Exception {
 
-        ByteBuf buf = (ByteBuf) msg;
+        String sentence = (String) msg;
 
-        buf.readUnsignedByte(); // header
-        buf.readUnsignedByte(); // forced
-        buf.readUnsignedByte(); // device type
-        int type = buf.readUnsignedByte();
-        buf.readUnsignedByte(); // length
-
-        String imei = ByteBufUtil.hexDump(buf.slice(buf.writerIndex() - 9, 8)).substring(1);
-        DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
-        if (deviceSession == null) {
-            return null;
-        }
+        int type = Integer.parseInt(sentence.substring(6, 8), 16);
 
         if (type == 0x01 || type == 0x02 || type == 0x04) {
+
+            ByteBuf buf = Unpooled.wrappedBuffer(DataConverter.parseHex(sentence));
+
+            buf.readUnsignedByte(); // header
+            buf.readUnsignedByte(); // forced
+            buf.readUnsignedByte(); // device type
+            buf.readUnsignedByte(); // type
+            buf.readUnsignedByte(); // length
+
+            String imei = ByteBufUtil.hexDump(buf.slice(buf.writerIndex() - 9, 8)).substring(1);
+            DeviceSession deviceSession = getDeviceSession(channel, remoteAddress, imei);
+            if (deviceSession == null) {
+                return null;
+            }
+
             Position position = new Position(getProtocolName());
             position.setDeviceId(deviceSession.getDeviceId());
+            position.setTime(new Date());
 
             position.set("height", buf.readUnsignedShort());
 
-- 
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