From 8e567d133c3d342cebd505c6d2effe6b2a41cb7b Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Fri, 1 Dec 2017 00:18:44 +1300
Subject: Support eelink UDP response

---
 .../traccar/protocol/EelinkProtocolDecoder.java    | 18 +++++++-------
 .../traccar/protocol/EelinkProtocolEncoder.java    | 28 +++++++++++++++-------
 2 files changed, 28 insertions(+), 18 deletions(-)

(limited to 'src/org/traccar')

diff --git a/src/org/traccar/protocol/EelinkProtocolDecoder.java b/src/org/traccar/protocol/EelinkProtocolDecoder.java
index a904601d6..30e94026c 100644
--- a/src/org/traccar/protocol/EelinkProtocolDecoder.java
+++ b/src/org/traccar/protocol/EelinkProtocolDecoder.java
@@ -18,6 +18,7 @@ package org.traccar.protocol;
 import org.jboss.netty.buffer.ChannelBuffer;
 import org.jboss.netty.buffer.ChannelBuffers;
 import org.jboss.netty.channel.Channel;
+import org.jboss.netty.channel.socket.DatagramChannel;
 import org.traccar.BaseProtocolDecoder;
 import org.traccar.DeviceSession;
 import org.traccar.helper.BitUtil;
@@ -59,14 +60,10 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
     public static final int MSG_CAMERA_INFO = 0x1E;
     public static final int MSG_CAMERA_DATA = 0x1F;
 
-    private void sendResponse(Channel channel, int type, int index) {
+    private void sendResponse(Channel channel, SocketAddress remoteAddress, String uniqueId, int type, int index) {
         if (channel != null) {
-            ChannelBuffer response = ChannelBuffers.buffer(7);
-            response.writeByte(0x67); response.writeByte(0x67); // header
-            response.writeByte(type);
-            response.writeShort(2); // length
-            response.writeShort(index);
-            channel.write(response);
+            channel.write(EelinkProtocolEncoder.encodeContent(
+                    channel instanceof DatagramChannel, uniqueId, type, index, null), remoteAddress);
         }
     }
 
@@ -321,12 +318,13 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
 
         ChannelBuffer buf = (ChannelBuffer) msg;
 
+        String uniqueId = null;
         DeviceSession deviceSession;
 
         if (buf.getByte(0) == 'E' && buf.getByte(1) == 'L') {
             buf.skipBytes(2 + 2 + 2); // udp header
-            deviceSession = getDeviceSession(
-                    channel, remoteAddress, ChannelBuffers.hexDump(buf.readBytes(8)).substring(1));
+            uniqueId = ChannelBuffers.hexDump(buf.readBytes(8)).substring(1);
+            deviceSession = getDeviceSession(channel, remoteAddress, uniqueId);
         } else {
             deviceSession = getDeviceSession(channel, remoteAddress);
         }
@@ -337,7 +335,7 @@ public class EelinkProtocolDecoder extends BaseProtocolDecoder {
         int index = buf.readUnsignedShort();
 
         if (type != MSG_GPS && type != MSG_DATA) {
-            sendResponse(channel, type, index);
+            sendResponse(channel, remoteAddress, uniqueId, type, index);
         }
 
         if (type == MSG_LOGIN) {
diff --git a/src/org/traccar/protocol/EelinkProtocolEncoder.java b/src/org/traccar/protocol/EelinkProtocolEncoder.java
index 917f964fe..41d76b24a 100644
--- a/src/org/traccar/protocol/EelinkProtocolEncoder.java
+++ b/src/org/traccar/protocol/EelinkProtocolEncoder.java
@@ -41,23 +41,24 @@ public class EelinkProtocolEncoder extends BaseProtocolEncoder {
         return sum;
     }
 
-    private ChannelBuffer encodeContent(long deviceId, String content) {
+    public static ChannelBuffer encodeContent(
+            boolean connectionless, String uniqueId, int type, int index, ChannelBuffer content) {
 
         ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
 
         if (connectionless) {
-            buf.writeBytes(ChannelBuffers.wrappedBuffer(DatatypeConverter.parseHexBinary('0' + getUniqueId(deviceId))));
+            buf.writeBytes(ChannelBuffers.wrappedBuffer(DatatypeConverter.parseHexBinary('0' + uniqueId)));
         }
 
         buf.writeByte(0x67);
         buf.writeByte(0x67);
-        buf.writeByte(EelinkProtocolDecoder.MSG_DOWNLINK);
-        buf.writeShort(2 + 1 + 4 + content.length()); // length
-        buf.writeShort(0); // index
+        buf.writeByte(type);
+        buf.writeShort(2 + (content != null ? content.readableBytes() : 0)); // length
+        buf.writeShort(index);
 
-        buf.writeByte(0x01); // command
-        buf.writeInt(0); // server id
-        buf.writeBytes(content.getBytes(StandardCharsets.UTF_8));
+        if (content != null) {
+            buf.writeBytes(content);
+        }
 
         ChannelBuffer result = ChannelBuffers.dynamicBuffer();
 
@@ -73,6 +74,17 @@ public class EelinkProtocolEncoder extends BaseProtocolEncoder {
         return result;
     }
 
+    private ChannelBuffer encodeContent(long deviceId, String content) {
+
+        ChannelBuffer buf = ChannelBuffers.dynamicBuffer();
+
+        buf.writeByte(0x01); // command
+        buf.writeInt(0); // server id
+        buf.writeBytes(content.getBytes(StandardCharsets.UTF_8));
+
+        return encodeContent(connectionless, getUniqueId(deviceId), EelinkProtocolDecoder.MSG_DOWNLINK, 0, buf);
+    }
+
     @Override
     protected Object encodeCommand(Command command) {
 
-- 
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