From 4066c24ed1ba8749a1a682acb5b027401d0df70f Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 14 Nov 2016 01:56:26 +1300
Subject: Another attempt to fix H02 frame decoder

---
 src/org/traccar/protocol/H02FrameDecoder.java | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

(limited to 'src/org/traccar/protocol')

diff --git a/src/org/traccar/protocol/H02FrameDecoder.java b/src/org/traccar/protocol/H02FrameDecoder.java
index d461c9219..a22252a57 100644
--- a/src/org/traccar/protocol/H02FrameDecoder.java
+++ b/src/org/traccar/protocol/H02FrameDecoder.java
@@ -54,16 +54,18 @@ public class H02FrameDecoder extends FrameDecoder {
 
         } else if (marker == '$') {
 
-            if (messageLength > 0 && buf.readableBytes() >= messageLength) {
-                return buf.readBytes(messageLength);
-            } else if (buf.readableBytes() >= MESSAGE_SHORT) {
-                if (buf.getUnsignedByte(buf.readerIndex() + MESSAGE_SHORT - 1) == 0) {
-                    return buf.readBytes(MESSAGE_SHORT);
-                } else if (buf.readableBytes() >= MESSAGE_LONG) {
-                    return buf.readBytes(MESSAGE_LONG);
+            if (messageLength == 0) {
+                if (buf.readableBytes() == MESSAGE_LONG) {
+                    messageLength = MESSAGE_LONG;
+                } else {
+                    messageLength = MESSAGE_SHORT;
                 }
             }
 
+            if (buf.readableBytes() >= messageLength) {
+                return buf.readBytes(messageLength);
+            }
+
         }
 
         return null;
-- 
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