1 files changed, 1 insertions, 1 deletions
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) {