From 972f237cd98dc477a1b497fed8270e3bdd6b6813 Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton.tananaev@gmail.com>
Date: Mon, 2 Dec 2019 08:56:33 -0800
Subject: Update frame decoder

---
 src/main/java/org/traccar/protocol/SuntechFrameDecoder.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/main/java/org/traccar/protocol/SuntechFrameDecoder.java b/src/main/java/org/traccar/protocol/SuntechFrameDecoder.java
index 7b8337468..8748ecc61 100644
--- a/src/main/java/org/traccar/protocol/SuntechFrameDecoder.java
+++ b/src/main/java/org/traccar/protocol/SuntechFrameDecoder.java
@@ -32,7 +32,7 @@ public class SuntechFrameDecoder extends BaseFrameDecoder {
     protected Object decode(
             ChannelHandlerContext ctx, Channel channel, ByteBuf buf) throws Exception {
 
-        if (buf.getByte(buf.readerIndex()) == (byte) 0x81) {
+        if (buf.getByte(buf.readerIndex() + 1) == 0) {
 
             int length = 1 + 2 + buf.getShort(buf.readerIndex() + 1);
             if (buf.readableBytes() >= length) {
-- 
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