From 19d7c0dd692145fa11dee3fa07099c80052e1be4 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Sun, 12 Jun 2016 15:00:08 +1200
Subject: Support J1708 decoding for Ulbotech

---
 .../traccar/protocol/UlbotechProtocolDecoder.java   | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/org/traccar/protocol/UlbotechProtocolDecoder.java b/src/org/traccar/protocol/UlbotechProtocolDecoder.java
index 9cbaadfb4..2fd7d8f74 100644
--- a/src/org/traccar/protocol/UlbotechProtocolDecoder.java
+++ b/src/org/traccar/protocol/UlbotechProtocolDecoder.java
@@ -65,6 +65,25 @@ public class UlbotechProtocolDecoder extends BaseProtocolDecoder {
         }
     }
 
+    private void decodeJ1708(Position position, ChannelBuffer buf, short length) {
+
+        int end = buf.readerIndex() + length;
+
+        while (buf.readerIndex() < end) {
+            int mark = buf.readUnsignedByte();
+            int len = BitUtil.between(mark, 0, 6);
+            int type = BitUtil.between(mark, 6, 8);
+            int id = buf.readUnsignedByte();
+            if (type == 3) {
+                id += 256;
+            }
+            String value = ChannelBuffers.hexDump(buf.readBytes(len - 1));
+            if (type == 2 || type == 3) {
+                position.set("pid" + id, value);
+            }
+        }
+    }
+
     private void decodeDriverBehavior(Position position, ChannelBuffer buf) {
 
         int value = buf.readUnsignedByte();
@@ -200,7 +219,7 @@ public class UlbotechProtocolDecoder extends BaseProtocolDecoder {
                     break;
 
                 case DATA_J1708:
-                    position.set("j1708", ChannelBuffers.hexDump(buf.readBytes(length)));
+                    decodeJ1708(position, buf, length);
                     break;
 
                 case DATA_VIN:
-- 
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